JP2018132457A - Flame monitoring method, flame monitoring device, and gas handling facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flame monitoring method, a flame monitoring device 1a, and the like capable of precisely detecting a colorless or light blue flame such as a hydrogen gas and a hydrocarbon gas which is hardly recognizable by a naked eye.SOLUTION: A flame monitoring method and a flame monitoring device 1a measure a light emission intensity of a predetermined wavelength in a wavelength region of about 1320 nm to about 1464 nm of a near ultraviolet ray emitted from a monitoring object region, and represents a measured value as coordinates in a graph of the light emission intensity in which a horizontal axis indicates the wavelength and a vertical axis indicates the light emission intensity. When a predetermined undulating pattern by an approximate line is generated, it is determined that the flame of the gas containing a hydrogen atom is present in the atom constituting a molecule, thereby issuing a warning. According to such flame monitoring method and the like, the flame such as the hydrogen gas and the hydrocarbon gas can be precisely detected even under the environment where sun light, white LED light, and the like are present.SELECTED DRAWING: Figure 1

Description

  TECHNICAL FIELD The present invention relates to a technique for monitoring the occurrence of a flame. More specifically, the present invention relates to a hydrogen supply station that supplies hydrogen gas to a fuel cell vehicle and a gas handling facility such as a chemical factory that produces and uses hydrogen gas or hydrocarbon gas. The present invention relates to a flame monitoring method, a flame monitoring apparatus, and a gas handling facility in which such a flame monitoring apparatus is installed.

The flame generated during the combustion of hydrogen gas is colorless and transparent, and the flame generated during the combustion of hydrocarbon gases such as methane, propane, and butane is mainly light blue and difficult to see with the naked eye. There are many cases. Therefore, for example, when a fire with a gas leak occurs in a hydrogen gas or hydrocarbon gas handling facility, it can be connected to early fire extinguishing activities by detecting the occurrence of the fire earlier than with the naked eye. Is desirable.
In response to such a request, the applicant of the present invention has worked on research and development of a technique for visualizing a colorless and transparent hydrogen flame by image processing. For example, Patent Document 1 (Japanese Patent Laid-Open No. 2013-36974) and Patent Document 2 (Japanese Patent Application Laid-Open No. 2013-36974). No. 2006-267097), a hydrogen flame visualization device was proposed.

  In the hydrogen flame visualization device described in Patent Document 1, the near-infrared wavelength and the heat ray wavelength were simultaneously detected at the same position in the near-infrared image and the heat ray (far-infrared) image including the wavelength set in the range of 930 to 950 nm. The region is determined to be a hydrogen flame region, an image of the hydrogen flame is created, and the hydrogen flame is visualized by superimposing it on a background image made up of a visible light image.

  Moreover, the hydrogen flame visualization apparatus described in Patent Document 2 captures ultraviolet rays (309 nm) and near infrared rays (950 nm) emitted by a hydrogen flame with a CCD camera, and the difference between these specific wavelength images and adjacent wavelength images. By extracting an image, an image of a hydrogen flame is created, and the hydrogen flame is visualized by superimposing it on an ultraviolet background image or a near infrared background image.

  However, the hydrogen flame visualization measures described in Patent Documents 1 and 2 have the following problems (a) to (c).

(A) The hydrogen flame visualization devices described in Patent Documents 1 and 2 both capture near-infrared images in the wavelength region of 930 to 950 nm, but 930 to be included in the light emitted by the hydrogen flame. The amount of near infrared light at 950 nm is small. Moreover, in order to detect only near-infrared rays in the same wavelength region emitted by a hydrogen flame, it is necessary to remove near-infrared rays having a wavelength close to the same wavelength region contained in sunlight. If an optical bandpass filter that transmits only infrared light is used, the bandwidth (transmission wavelength range) becomes extremely narrow, so not only the near-infrared light amount of sunlight but also the near-infrared light amount of hydrogen flames. Is reduced, making it difficult to detect flames with low emission intensity, such as small hydrogen flames.

(B) In hydrogen handling facilities where hydrogen flame visualization equipment is used, in preparation for hydrogen gas leakage accidents, certain areas where hydrogen supply equipment, hydrogen transport pipes, hydrogen storage tanks, etc. may become ignition sources There is an “explosion-proof area” where it cannot be installed.
Therefore, for example, in the hydrogen flame visualization apparatus described in Patent Documents 1 and 2, a CCD camera for imaging a hydrogen flame using a power source can be an ignition source, so it cannot be installed in an explosion-proof area and is a monitoring target. It had to be installed in a non-explosion-proof area that was quite far from the area. For this reason, it is difficult to detect a small hydrogen flame, and when smoke is generated by a fire or the like, there is a problem that light emitted from the hydrogen flame is blocked by the smoke and cannot be detected.

  Conversely, if you want to install a CCD camera that uses a power supply in an explosion-proof area, you must attach a thick metal hood to the CCD camera, etc. to make it an explosion-proof specification, which increases the size and price of the device. There is a problem that becomes high.

(C) Hydrogen handling facilities where hydrogen flame visualization equipment is used require continuous monitoring means to detect not only hydrogen flames but also abnormalities such as suspicious person intrusions in order to prevent accidents. It is said that.
A general-purpose intruder monitoring device that continuously monitors the intrusion of a suspicious person has a near-infrared image pickup device that picks up a near-infrared image including a wavelength region of approximately 800 to 950 nm and a near-infrared ray in the same wavelength region in many models. A near infrared irradiator for irradiating is provided. The reason is that a near-infrared ray having a relatively short wavelength of 800 to 950 nm can use a general-purpose and inexpensive CCD camera as a near-infrared detector, so that the price of the intruder monitoring device can be kept low. It is.

  Here, since the hydrogen flame visualization apparatus described in Patent Documents 1 and 2 captures a near-infrared image in a wavelength region of 930 to 950 nm, the irradiation light from the near-infrared irradiator of the general-purpose intruder monitoring apparatus described above. And its reflected light may be mistakenly detected as near infrared by a hydrogen flame. Therefore, there is a problem that such a hydrogen flame visualization device cannot be used together with a general-purpose intruder monitoring device.

JP 2013-36974 A JP 2006-267097 A

Therefore, the present invention can detect a flame of hydrogen gas or hydrocarbon gas that is difficult to see with the naked eye because the flame is colorless and transparent or light blue, and in particular, there is sunlight or reflected light of a headlight of an automobile. It is an object of the present invention to provide a flame monitoring method and a flame monitoring apparatus that can detect a flame with high accuracy even in an environment where the above is performed.
It is another object of the present invention to provide a flame monitoring device that can monitor the monitoring target area in the explosion-proof area where gas may leak, and that is small in size and excellent in cost.
Furthermore, it is an object of the present invention to provide a flame monitoring device that can be used in combination with such an intruder monitoring device without erroneously detecting near infrared rays emitted from the intruder monitoring device equipped with a general-purpose near infrared irradiator. .

It is another object of the present invention to provide a gas handling facility provided with a flame monitoring device that can monitor a monitoring target area in an explosion-proof area where gas may leak.
It is another object of the present invention to provide a gas handling facility in which both an intruder monitoring apparatus equipped with a general-purpose near infrared irradiator and a flame monitoring apparatus are installed.

The above problems have been solved by the following means.
[1] A flame monitoring method for detecting a flame of a gas containing a hydrogen atom in an atom constituting a molecule, wherein A1, B1, A2 of “Near-infrared emission intensity” of Table 1 below emitted from a monitored region, and One or more of each of B2 is measured, and the obtained measurement values are expressed as coordinates in a graph in which the horizontal axis is wavelength and the vertical axis is emission intensity, and an approximate line is calculated. A flame monitoring method comprising: determining that the flame is present and issuing an alarm when a "pattern" occurs.

[2] A flame monitoring apparatus for detecting a flame of a gas containing hydrogen atoms in atoms constituting a molecule, a light collecting means for taking in light emitted from a monitored region, and light collected in the light collecting means Near-infrared detection means provided with a near-infrared detection means for measuring one or more of each of A1, B1, A2, and B2 of “Near-infrared emission intensity” of Table 1 included above, and the near-by obtained The storage device that records the measured value of the emission intensity of infrared rays, and the measured value are expressed as coordinates in a graph in which the horizontal axis is the wavelength and the vertical axis is the emission intensity, and an approximate straight line is calculated. An information processing unit comprising: an arithmetic device that determines that the flame is present when an "approximate straight line pattern" occurs, and an alarm device that issues an alarm when the arithmetic device determines that the flame is present Flame monitoring device, characterized in that.

[3] The flame monitoring device according to the above [2], wherein the condensing means has no ignition source and is connected to the near-infrared detecting means via an optical transmission cable.

[4] The light collecting means does not have an ignition source, and a plurality of light collecting means are provided. The light collecting means is connected to the light incident switching means via an optical transmission cable provided for each light collecting means. The flame monitoring device according to the above [2], wherein the light transmitted by is appropriately selected by the incident light switching means and guided to the near infrared detection means.

[5] The flame monitoring apparatus according to [2], wherein the near infrared detection means is explosion-proof.

[6] The detector is configured to emit light from a gas condensing unit that captures light emitted from the region to be monitored, and a gas flame that contains hydrogen atoms in the atoms constituting the molecules contained in the light captured by the condensing unit. And a far-infrared detecting means for detecting far-infrared light including a wavelength set within the far-infrared wavelength region, and the arithmetic unit of the information processing unit receives far-infrared light including the set wavelength in the detection unit. It is determined that the flame is present when the "approximate straight line pattern" is generated by the measurement value of the near-infrared emission intensity obtained by the detection unit when detected. The flame monitoring device according to any one of [2] to [5] above.

[7] The detector is configured to emit light from a gas condensing unit that captures light emitted from the region to be monitored, and a gas flame containing hydrogen atoms in the atoms included in the light included in the light condensing unit. And an ultraviolet ray detecting means for detecting ultraviolet rays including a wavelength set within a wavelength range of the ultraviolet rays to be detected, and the arithmetic unit of the information processing unit is configured to detect the ultraviolet ray including the set wavelength in the detection unit. And, when the above-mentioned “approximate straight line pattern” is generated by the measured value of the near-infrared emission intensity obtained by the detection unit, it is determined that the flame is present. 2] to the flame monitoring device according to any one of the above [5].

[8] The detection unit emits light from a gas condensing unit that captures light emitted from the region to be monitored, and a gas flame containing hydrogen atoms in the atoms constituting the molecules contained in the light captured by the condensing unit. A far-infrared detecting means for detecting far-infrared light having a wavelength set within the far-infrared wavelength region, and a gas containing hydrogen atoms in the atoms constituting the molecules contained in the light taken into the light collecting means. And an ultraviolet ray detecting means for detecting ultraviolet rays including a wavelength set within a wavelength region of ultraviolet rays emitted from a flame, and the arithmetic unit of the information processing unit includes far infrared rays including the set wavelength in the detection unit and When the ultraviolet ray including the set wavelength is detected at the same time, and the measured value of the near-infrared emission intensity obtained by the detection unit, the “approximate straight line pattern” is not generated. Case, the flame monitoring apparatus according to any one of [5] [2], wherein determining that the flame is present.

[9] The above-mentioned [6] or [8], wherein the far-infrared detecting means is connected to the light collecting means via an optical transmission cable, and the light collecting means has no ignition source. Flame monitoring device.

[10] Either of the above [7] or [8], wherein the ultraviolet ray detection means is connected to the light collection means via an optical transmission cable, and the light collection means has no ignition source. The flame monitoring device described in 1.

[11] The flame monitoring device according to [10], wherein the ultraviolet light condensing means includes a wavelength converter that converts ultraviolet light into visible light.

[12] Explosion-proof area and non-explosion-proof area are provided, and the facility for handling gas containing hydrogen atoms in the atoms constituting the molecule, [3], [4], [9], [10] Alternatively, the flame monitoring device according to any one of the above [11] is installed, and among the constituent elements of the flame monitoring device, the light collecting means is disposed in the explosion-proof area, and the light collecting means and the optical transmission cable are interposed therebetween. A gas handling facility characterized in that other components including a near-infrared detection means, an incident light switching means, an ultraviolet detection means, or a far-infrared detection means connected to each other are arranged in a non-explosion-proof area.

[13] A gas handling facility including a hydrogen atom in an atom constituting a molecule, wherein the flame monitoring device and the intruder monitoring device according to any one of [2] to [11] are installed, At least a part of the monitoring target area of the flame monitoring apparatus and the monitoring target area of the intruder monitoring apparatus overlaps, and the intruder monitoring apparatus is a near infrared ray including a wavelength set in a wavelength range of less than 1320 nm. A gas handling facility comprising a near-infrared irradiator that irradiates near-infrared rays in a wavelength region that does not substantially overlap with the near-infrared wavelength region detected by the near-infrared detector of the flame monitoring device.

  The flame monitoring method according to the above [1] in the present invention is a method that is generated when a hydrocarbon gas such as hydrogen gas, methane gas, propane gas, or butane gas containing hydrogen atoms in the atoms constituting the molecules is burned. In the infrared wavelength range of about 1320 to about 1464 nm, this is a flame monitoring method for detecting a flame by utilizing the characteristic undulation pattern of the change in emission intensity corresponding to the wavelength.

  For example, the curve P1 in the graph of FIG. 5 shows the wavelength of near infrared rays emitted from the flame of hydrogen gas (horizontal axis: unit) when hydrogen gas of 1.0 L per minute is ejected from a nozzle and burned. In the case of the wavelength a1 of about 1338 nm and the wavelength a2 of about 1388 nm, the emission intensity is low and becomes a valley portion in the curve P1. At the wavelength b1 and the wavelength b2 of about 1437 nm, the emission intensity is high and becomes a peak in the curve P1, and valleys and peaks appear alternately according to the change in wavelength.

Such a characteristic pattern in which low and high emission intensities appear alternately according to changes in wavelength is a near infrared ray emitted from a flame when hydrogen atoms are burned to generate water molecules (H ₂ O). For this reason, not only hydrogen gas but also the near-infrared emission intensity emitted from the flames of hydrocarbon gases such as methane gas, propane gas, butane gas, etc. that contain hydrogen atoms in the atoms constituting the molecule is similar. A pattern appears.

Here, in the curve P1 of FIG. 5, the light emission intensity of the valley at the wavelength a1 of about 1338 nm is about 1001 in an arbitrary unit, and the light emission intensity is about 1320 nm to about 1340 nm including the wavelength a1. The range of 1001 to about 1209 (the range of A1) is shown.
Similarly, the emission intensity of the valley at the wavelength a2 of about 1388 nm is about 1309. In the wavelength region of about 1386 nm to about 1394 nm including the wavelength a2, the emission intensity is in the range of about 1309 to about 1655 (A2 range). ).

Further, in the curve P1, the emission intensity at the wavelength b1 of about 1351 nm of the peak is about 2935 in an arbitrary unit, and the emission intensity is about 2554 to about 2935 in the wavelength region of about 1345 nm to about 1362 nm including the wavelength b1. (B1 range) is shown.
Similarly, the emission intensity of the peak at the wavelength b2 of about 1437 nm is about 3110. In the wavelength region of about 1399 nm to about 1464 nm including the wavelength b2, the emission intensity is in the range of about 2080 to about 3110 (the range of B2 ).

  Thus, the emission intensities in the wavelength region of about 1320 nm to about 1340 nm including the wavelength a1 of the valley and the wavelength region of about 1386 nm to about 1394 nm including the wavelength a2 all include the wavelength b1 of the peak. Compared to the emission intensity in the wavelength region of about 1345 nm to about 1362 nm and the wavelength region of about 1399 nm to about 1464 nm including the wavelength b2, there is no overlapping range.

  In addition, near infrared rays in a wavelength region of about 1320 nm to about 1464 nm are contained in a very small amount in sunlight reaching the ground. For example, the curve Q in the graph of FIG. 5 corresponds to the wavelength of the reflected light on the white wall of sunlight measured at around 15:30 on April 8, 2015 (weather is fine) in Takamatsu City, Kagawa Prefecture. When the emission intensity is shown, the emission intensity in the wavelength region of about 1320 nm to about 1464 nm is considerably lower than the emission intensity of the hydrogen flame (curves P1, P2). Therefore, when a flame is detected by near infrared rays in the wavelength region of about 1320 nm to about 1464 nm, it can be said that there is an extremely low possibility that reflected light of sunlight is erroneously detected as a flame.

  Moreover, the curve R in the graph of FIG. 7 shows the light emission intensity (vertical axis: arbitrary unit) corresponding to the wavelength of the near infrared ray (horizontal axis: unit nm) emitted from the headlight for automobiles using white LEDs as the light source. However, in the wavelength region of about 1320 nm to about 1464 nm, there is a portion where the emission intensity of the white LED (curve R) is higher than the emission intensity of the hydrogen flame (curve P5). For example, at a wavelength (a1) of about 1338 nm and a wavelength (a2) of about 1388 nm, the emission intensity of the white LED is higher than the emission intensity of the hydrogen flame.

However, since the change in the emission intensity corresponding to the wavelength of the white LED is a gentle curve with few undulations as shown by the curve R, when the near infrared rays of the white LED and the hydrogen flame are detected simultaneously (curve P5 and the curve The emission intensity corresponding to the wavelength (when R is added) is a curve in which the characteristic undulation pattern of the change in the emission intensity of the hydrogen flame remains as shown in the curve P6.
That is, the emission intensity of the hydrogen flame is low at the wavelength (a1) of about 1338 nm and the wavelength (a2) of about 1388 nm, and the emission intensity is high at the wavelength (b1) of about 1351 nm and the wavelength (b2) of about 1437 nm. This feature is not lost even when white LED light is detected along with the hydrogen flame (curve 6). Therefore, when a flame is detected by near infrared rays in a wavelength region of about 1320 nm to about 1464 nm, it can be said that there is a very low possibility that white LED light emitted from an automobile headlight or the like is erroneously detected as a flame.

The flame monitoring method according to [1] in the present invention is characterized by a change in emission intensity corresponding to the wavelength of near infrared rays emitted from a gas flame containing hydrogen atoms in the atoms constituting the molecule as described above. This is a flame monitoring method for detecting a flame by using a typical undulation pattern.
That is, one or more of each of A1, B1, A2 and B2 of “Near-infrared emission intensity” in Table 1 emitted from the monitored region is measured, and the obtained measurement values are plotted with the horizontal axis being the wavelength. The axis is expressed as coordinates in the graph of emission intensity, and by calculating an approximate line, when the “approximate straight line pattern” in Table 2 occurs, it is determined that the flame exists and an alarm is issued.

  In addition, in order to calculate the approximate line by expressing the measured value of the near-infrared emission intensity as coordinates in the graph, it is not necessary to create a graph that can be actually visually recognized or to create an approximate line based on the coordinates, For example, it may be calculated in the state of calculation data by an arithmetic device such as a CPU. Further, even when it is determined that the flame is present based on the “approximate straight line pattern” in Table 2, it is not necessary to create an approximate straight line pattern that can be actually visually recognized. Judgment is sufficient.

  Therefore, according to the flame monitoring method described in [1] above, it is possible to detect a flame such as hydrogen gas or hydrocarbon gas that is difficult to see with the naked eye because the flame is colorless and transparent or light blue. Even in an environment where there is a reflected light or white LED light of an automobile headlight, a flame can be detected with high accuracy and an alarm can be issued, which can contribute to early detection of a fire.

  The flame monitoring apparatus according to the above [2] in the present invention is a condensing unit that captures light emitted from a monitoring target region, and “near infrared light emission” in Table 1 included in the light captured by the condensing unit. And a near-infrared detecting means for measuring one or more of each of A1, B1, A2 and B2 of “intensity”, so that a near-emission emitted from a flame of a gas containing hydrogen atoms in the atoms constituting the molecule A characteristic change in emission intensity corresponding to the wavelength in the wavelength region of about 1320 nm to about 1464 nm of infrared rays can be detected.

Moreover, since the said flame monitoring apparatus is equipped with the information processing part provided with a memory | storage device, a calculating device, and an alarm device, each measured value data of the near-infrared light emission intensity obtained in the detection part is recorded with a memory | storage device. When the above-mentioned measured values are represented by coordinates in the graph in which the horizontal axis is the wavelength and the vertical axis is the emission intensity, the approximate straight line is created by the arithmetic unit, and the “approximate straight line pattern” in Table 2 is generated. It can be determined that there is a flame.
Furthermore, when it is determined by the arithmetic device that a flame is present, an alarm device can issue an alarm. The alarm may emit an alarm sound or turn on an alarm lamp, or may display an alarm on a monitor screen.
Further, when the arithmetic unit determines that a flame is present, the storage device can be configured to store measured data of near-infrared emission intensity for a predetermined time before and after the occurrence of the flame.

  Therefore, according to the flame monitoring device described in [2] above, it is possible to detect flames such as hydrogen gas and hydrocarbon gas that are difficult to see with the naked eye. Even in an environment where LED light or the like exists, a flame can be detected with high accuracy and an alarm can be issued, which can contribute to early detection of a fire.

  Further, general-purpose intruder monitoring devices of the type that detect near infrared rays include a near infrared irradiator that irradiates near infrared rays in a wavelength region of about 800 nm to about 950 nm in many of the models. The near-infrared detection means of the flame monitoring device described in the above section detects near-infrared light having a specific wavelength in the wavelength region of about 1320 nm to about 1464 nm, and therefore does not detect near-infrared light in the wavelength region of about 800 nm to about 950 nm. . Therefore, according to the flame monitoring device described in [2] above, there is a risk of misdetecting near-infrared light or reflected light emitted from the near-infrared irradiator of the general-purpose intruder monitoring device as flame emission. Therefore, it can be used together with the above-mentioned general-purpose intruder monitoring device, which is convenient.

The flame monitoring device according to the above [3] in the present invention is the hydrogen flame monitoring device according to the above [2], wherein the condensing means does not have anything that can be an ignition source such as a power source, and the condensing means. And the near-infrared detection means are connected via an optical transmission cable, it is possible to dispose only the condensing means away from the flame monitoring device and place it in a place where it is not possible to place anything that can be an ignition source.
Therefore, for example, when installing the flame monitoring device according to [3] above in a gas handling facility provided with an explosion-proof area and a non-explosion-proof area, the light collecting means can be arranged in the explosion-proof area. By disposing the light collecting means in the vicinity of a place where gas may leak, the flame can be detected with high accuracy.

In addition, since other components including a near-infrared detection means connected via a light transmission cable and a light collecting means arranged in the explosion-proof area can be arranged in the non-explosion-proof area, the configuration of the flame monitoring device Among the elements, it is not necessary to make the near-infrared detection means that can be an ignition source because the power source is used, and the flame monitoring apparatus can be made small and excellent in cost.
In addition, since the condensing means can be composed of, for example, a lens for condensing light and a member connecting the lens and the optical transmission cable, the condensing means can be formed extremely small in that case. It becomes possible to install in a narrow place.

  The flame monitoring device according to the above [4] in the present invention is the flame monitoring device according to the above [2], comprising a plurality of light collecting means, and an optical transmission cable provided for each of these light collecting means. Therefore, the light transmitted by each optical transmission cable can be appropriately selected by the incident light switching means and guided to the near infrared detection means. Accordingly, a plurality of flames can be monitored by one near infrared detection means, and the flame monitoring device can be made small and excellent in cost.

Further, the plurality of condensing means do not have anything that can be an ignition source unlike a power source, and the condensing means and the light incident switching means are connected via an optical transmission cable. By separating only the light condensing means from the flame monitoring device, it can be placed in a place where anything that can be a source of ignition cannot be placed.
Therefore, for example, when installing the flame monitoring device described in [4] above in a gas handling facility provided with an explosion-proof area and a non-explosion-proof area, the light collecting means can be arranged in the explosion-proof area. By arranging the light condensing means in the vicinity of a place where gas may leak, flame detection can be performed with high accuracy.

  Furthermore, since other components including the light incident switching means connected via the light transmission cable and the light collecting means arranged in the explosion-proof area can be arranged in the non-explosion-proof area, the configuration of the flame monitoring device Among the elements, it is not necessary to make the incident light switching means and the near-infrared detecting means, which can be an ignition source because of the use of the power source, have an explosion-proof specification, and the flame monitoring device can be made small and cost-effective.

  The flame monitoring apparatus according to [5] of the present invention is the hydrogen flame monitoring apparatus according to [2], wherein the light collecting means and the near infrared detection means are explosion-proof specifications. When the flame monitoring device according to [5] is installed in a gas handling facility provided with an area, the light collecting means and the near infrared detecting means can be arranged in the explosion-proof area. For this reason, it is possible to monitor the monitoring target area where the gas may leak out, and to detect the flame with high accuracy.

  In the flame monitoring device according to [6] in the present invention, in the flame monitoring device according to any one of [2] to [5], the detection unit collects light emitted from the monitored region. And far-infrared light having a wavelength set in a wavelength range of far-infrared emitted from a flame of a gas containing hydrogen atoms in the atoms constituting the molecule contained in the light captured by the light collecting means. Since the far-infrared detecting means is provided, it is possible to detect far-infrared rays emitted by the flame.

The arithmetic unit of the information processing unit is a case where far infrared rays including the set wavelength are detected by the detection unit, and the measured value of the near infrared emission intensity obtained by the detection unit. When the “approximate straight line pattern” in Table 2 occurs, it is determined that the flame exists, so that the flame can be detected with high accuracy.
For example, even when the far-infrared detection means erroneously detects that the temperature rise in the monitoring target area due to a cause other than the flame is due to the flame, the measurement of the near-infrared emission intensity obtained by the detection unit is further performed. Since the flame monitoring device according to [6] is configured to determine that a flame exists only when the value indicates the “approximate straight line pattern” in Table 2, the flame monitoring device according to the above [6] has very few false detections, The flame can be detected with high accuracy.

  The flame monitoring device according to the above [7] in the present invention is the flame monitoring device according to any one of the above [2] to [5], wherein the detection unit collects light emitted from the monitored region. UV detection that detects ultraviolet rays including a wavelength set in a wavelength region of ultraviolet rays emitted from a flame of a gas containing hydrogen atoms in the atoms constituting the molecule, included in the light captured by the light collecting means Since the means is provided, the ultraviolet rays emitted from the flame can be detected.

The arithmetic unit of the information processing unit is a case where ultraviolet rays including the set wavelength are detected in the detection unit, and the measurement value of the near-infrared emission intensity obtained by the detection unit is When the “approximate straight line pattern” in Table 2 occurs, it is determined that the flame is present, so that the flame can be detected with high accuracy.
For example, even when the ultraviolet ray detection means erroneously detects that the ultraviolet ray contained in sunlight is due to a flame, the measured value of the near-infrared emission intensity obtained by the detection unit is as shown in Table 2 above. Since the flame monitoring device described in [7] is configured so as to determine that a flame exists only when an “approximate straight line pattern” is indicated, the flame monitoring device according to the above [7] has very few false detections and detects the flame with high accuracy. It can be done.

The flame monitoring device according to [8] in the present invention is the light monitoring device according to any one of [2] to [5], wherein the detection unit collects light emitted from the region to be monitored. And far-infrared light having a wavelength set in a wavelength range of far-infrared emitted from a flame of a gas containing hydrogen atoms in the atoms constituting the molecule contained in the light captured by the light collecting means. Since the far-infrared detecting means is provided, it is possible to detect far-infrared rays emitted by the flame.
In addition, an ultraviolet ray detection means for detecting an ultraviolet ray including a wavelength set in a wavelength region of an ultraviolet ray emitted from a gas flame containing a hydrogen atom in an atom constituting a molecule contained in the light taken into the light collecting means. Therefore, the ultraviolet rays emitted from the flame can be detected.

  Then, the arithmetic unit of the information processing unit is a case in which far infrared rays including the set wavelength and ultraviolet rays including the set wavelength are simultaneously detected in the detection unit, and obtained by the detection unit. When the “approximate straight line pattern” shown in Table 2 is generated by the measured value of the near-infrared emission intensity, it is determined that the flame exists, so that the flame can be detected with high accuracy.

The flame monitoring device according to [9] in the present invention is the flame monitoring device according to [6] or [8], wherein the far-infrared detecting means is connected to a condensing means via an optical transmission cable. In addition, since the light collecting means does not have an ignition source, it is possible to dispose only the light collecting means from the flame monitoring device and place it in a place where it is not possible to place anything that can be an ignition source.
Therefore, for example, when installing the flame monitoring device according to [9] above in a gas handling facility having an explosion-proof area and a non-explosion-proof area, it is possible to dispose the far-infrared light collecting means in the explosion-proof area. Therefore, the flame can be detected with high accuracy by disposing the light collecting means in the vicinity of the portion where the gas may leak.

Furthermore, since other components including a far-infrared detection means connected via a light transmission cable and a light collecting means arranged in the explosion-proof area can be arranged in the non-explosion-proof area, the configuration of the flame monitoring device Of the elements, it is not necessary to make the far-infrared detection means, which can be an ignition source because of the use of a power source, an explosion-proof specification, and the flame monitoring device can be made small and excellent in cost.
In addition, since the condensing means can be composed of, for example, a lens for condensing light and a member connecting the lens and the optical transmission cable, the condensing means can be formed extremely small in that case. It can be installed in a narrow place.

The flame monitoring device according to [10] in the present invention is the flame monitoring device according to [7] or [8], wherein the ultraviolet ray detection means is connected to the light collecting means via an optical transmission cable. In addition, since the condensing means does not have an ignition source, it is possible to dispose only the condensing means away from the flame monitoring device, and to arrange the condensing means in a place where it cannot be arranged.
Therefore, for example, when the flame monitoring device according to [10] is installed in a gas handling facility provided with an explosion-proof area and a non-explosion-proof area, the ultraviolet light collecting means can be arranged in the explosion-proof area. Therefore, the flame can be detected with high accuracy by disposing the light collecting means in the vicinity of the place where the gas may leak.

In addition, other components including the ultraviolet light detecting means connected via the optical transmission cable and the light collecting means arranged in the explosion-proof area can be arranged in the non-explosion-proof area, so that the components of the flame monitoring device Among them, it is not necessary to make the ultraviolet ray detection means that can be an ignition source because the power source is used as an explosion-proof specification, and the flame monitoring device can be made small and excellent in cost.
In addition, since the condensing means can be composed of, for example, a lens for condensing light and a member connecting the lens and the optical transmission cable, the condensing means can be formed extremely small in that case. It can be installed in a narrow place.

  The flame monitoring device according to [11] in the present invention is the flame monitoring device according to [10], since the ultraviolet ray condensing means includes a wavelength converter that converts ultraviolet rays into visible rays. It is possible to convert ultraviolet rays from the monitoring target area taken into the means into visible light. Therefore, it is possible to use an inexpensive general-purpose product for visible light transmission instead of an expensive dedicated product for ultraviolet transmission as an optical transmission cable for connecting the light collecting means and the ultraviolet detection means. The cost can be improved.

The gas handling facility according to the above [12] in the present invention is a gas handling facility provided with an explosion-proof zone and a non-explosion-proof zone and containing hydrogen atoms in the atoms constituting the molecule. ], [9], [10] or [11] is installed, and among the components of the flame monitoring apparatus, the light collecting means is disposed in the explosion-proof area, and the Explosion-proof area because other components including near-infrared detection means, incident light switching means, ultraviolet detection means or far-infrared detection means connected to the optical means via an optical transmission cable are arranged in the non-explosion-proof area The condensing means arranged inside can detect a flame in the vicinity of a portion where hydrogen gas may leak.
Therefore, in the gas handling facility described in [12] above, even a small flame can be detected, so that when a fire with a gas leak occurs, fire extinguishing work can be performed quickly and accurately. .

  Further, in the gas handling facility described in [12] above, components that can be ignition sources such as using a power source among the components of the flame monitoring device are arranged in the non-explosion-proof area. Since it is not necessary to make specifications, it is excellent in cost, and it is highly safe because it does not easily cause a fire due to ignition of the leaked hydrogen gas.

In the gas handling facility according to the above [13] in the present invention, the atom constituting the molecule in which the flame monitoring device and the intruder monitoring device according to any one of [2] to [11] are installed. It is a facility for handling gas containing hydrogen atoms, and at least a part of the monitoring target region of the flame monitoring device and the monitoring target region of the intruder monitoring device overlaps, and the intruder monitoring device is within a wavelength region of less than 1320 nm. A near-infrared irradiator that irradiates near-infrared rays including a wavelength set in step 1 and that does not substantially overlap with the near-infrared wavelength range detected by the near-infrared detection means of the flame monitoring device. Therefore, the flame monitoring apparatus according to [13] erroneously detects near-infrared rays or reflected light emitted from a near-infrared irradiator of a general-purpose intruder monitoring apparatus as near-infrared rays emitted by a flame. Not with.
Therefore, a general-purpose inexpensive intruder monitoring device can be installed together with the flame monitoring device, and the same monitoring target area can be monitored simultaneously by both devices, which is convenient and excellent in cost.

  Note that the near infrared wavelength region detected by the near infrared detecting means of the flame monitoring device and the near infrared wavelength region irradiated by the near infrared irradiator of the intruder monitoring device do not substantially overlap. Even if there is a wavelength region that overlaps both, it does not mistakenly detect the near infrared ray emitted from the near infrared irradiator of the intruder monitoring device as the near infrared ray emitted from the flame by the flame monitoring device. If it is within the range, the two wavelength regions are understood to be in a state of “substantially not overlapping”.

1 is an overall system diagram of a flame monitoring apparatus according to a first embodiment of the present invention. It is a whole system figure of the flame monitoring apparatus concerning 2nd Embodiment of this invention. It is a whole system figure of the flame monitoring apparatus concerning 3rd Embodiment of this invention. It is a whole system figure of the flame monitoring apparatus concerning 4th Embodiment of this invention. It is a graph which shows the emitted light intensity of the hydrogen flame in the wavelength range of 1300 nm-1600 nm of near infrared rays, and the emitted light intensity of reflected light of sunlight. It is a graph which shows the sum of the light emission intensity | strength of the hydrogen flame in the wavelength range of 1300 nm-1600 nm of near infrared rays, and the light emission intensity of reflected light of sunlight. It is a graph which shows the emission intensity of the hydrogen flame in the 1300 nm-1600 nm wavelength range of near infrared rays, the emission intensity of white LED, and these sums. It is the table | surface which showed the proportionality constant of the approximate straight line between the predetermined coordinates on each curve in the graph of FIG. 5 and FIG. It is explanatory drawing of the gas handling facility of this invention.

≪Flame monitoring method≫
First, the flame monitoring method of the present invention will be described.
The flame monitoring method of the present invention is characterized by a change in emission intensity corresponding to the wavelength in the wavelength region of about 1320 nm to about 1464 nm of near infrared rays emitted from a gas flame containing hydrogen atoms in the atoms constituting the molecule. This is a flame monitoring method for detecting a flame by using a relief pattern.

  The curve P1 in the graph of FIG. 5 shows the emission intensity corresponding to the wavelength of near infrared rays emitted from the flame when hydrogen gas of 1.0 L per minute is ejected from the nozzle and burned, and is about 1338 nm. In the wavelength (a1) and the wavelength (a2) of about 1388 nm, the emission intensity is low and becomes a valley in the curve P1, and in the wavelength (b1) of about 1351 nm and the wavelength (b2) of about 1437 nm, the emission intensity is high. It is a peak in the curve P1, and these valleys and peaks appear alternately as the wavelength increases.

  Curve P2 in the graph of FIG. 5 shows the emission intensity corresponding to the wavelength of near infrared rays emitted from the flame of hydrogen gas when hydrogen gas having a volume of 0.3 L per minute is ejected from the nozzle and burned. In the wavelength region of about 1338 nm to about 1437 nm, the emission intensity is lower than that in the case of 1.0 L per minute (curve P1) in which the amount of hydrogen gas ejected is larger. However, the wavelength at which valleys and peaks with high emission intensity occur in the curve P2 is substantially the same wavelength as in the curve P1.

  Note that, as is apparent from the curves P1 and P2, the near-infrared emission intensity emitted from the flame changes in accordance with the hydrogen gas ejection amount (combustion amount). Therefore, it is possible to estimate the combustion amount of hydrogen gas from the measured value of the emission intensity.

  As described above, in the curve P1 of FIG. 5, the emission intensity in the wavelength region of about 1320 nm to about 1340 nm including the wavelength a1 of about 1338 nm and the wavelength region of about 1386 nm to about 1394 nm including the wavelength a2 of about 1388 nm is shown. Are significantly lower than the emission intensity in the wavelength range of about 1345 nm to about 1362 nm including the wavelength b1 of about 1351 nm and the wavelength range of about 1399 nm to about 1464 nm including the wavelength b2 of about 1437 nm. There is no overlapping range.

Further, in the curve P2 of FIG. 5, the emission intensity at the wavelength a1 of about 1338 nm of the valley is about 877 in arbitrary units, and the emission intensity is about 877 in the wavelength region of about 1320 nm to about 1340 nm including the wavelength a1. To about 1035 (A1 range).
Similarly, the light emission intensity of the valley at the wavelength a2 of about 1388 nm is about 885. In the wavelength region of about 1386 nm to about 1394 nm including the wavelength a2, the light emission intensity is in the range of about 885 to about 1157 (range of A2). Show.

Further, in the curve P2, the emission intensity at the wavelength b1 of about 1351 nm of the peak is about 2125 in an arbitrary unit, and the emission intensity is about 1755 to about 2125 in the wavelength region of about 1345 nm to about 1362 nm including the wavelength b1. (B1 range) is shown.
Similarly, the emission intensity of the peak at the wavelength b2 of about 1437 nm is about 2125, and the emission intensity is in the range of about 1396 to about 2125 (the range of B2) in the wavelength region of about 1399 nm to about 1464 nm including the wavelength b2. ).

  Thus, even in the curve P2 (combustion of 0.3 L of hydrogen gas per minute) in which the amount of hydrogen gas burned is smaller than in the case of the curve P1 (combustion of 1.0 L of hydrogen gas per minute), the curve P1 and Similarly, the emission intensities in the wavelength region of about 1320 nm to about 1340 nm including the wavelength a1 of the valley and the wavelength region of about 1386 nm to about 1394 nm including the wavelength a2 are both about the wavelength b1 of the peak. Compared with the emission intensity in the wavelength region of 1345 nm to about 1362 nm and the wavelength region of about 1399 nm to about 1464 nm including the wavelength b2, there is no overlapping range.

  In addition, near infrared rays in the wavelength region of about 1320 nm to about 1464 nm are contained in an extremely small amount in sunlight reaching the ground (see curve Q in the graph of FIG. 5). Therefore, when the presence of a flame is detected by near infrared rays in the wavelength region of about 1320 nm to about 1464 nm, the possibility of erroneously detecting reflected sunlight as a flame is extremely low.

  A curve P3 in the graph of FIG. 6 is a curve representing the sum of the emission intensities of the curves P1 and Q of FIG. 5, and a curve P4 of FIG. 6 represents the sum of the emission intensities of the curves P2 and Q of FIG. It is the curve represented. That is, the curves P3 and P4 show the emission intensity in the wavelength region of 1300 nm to 1600 nm when near infrared rays included in the hydrogen flame and the reflected light of sunlight are simultaneously detected. This is a case where hydrogen gas having a light emission intensity of 1.0 L / min is burned, and a curve P4 is a case where hydrogen gas having a light emission intensity of 0.3 L / min is burned.

  As is clear from FIG. 6, the near-infrared emission intensity in the wavelength region of about 1320 nm to about 1464 nm contained in the reflected sunlight is extremely low, so the near-infrared of the hydrogen flame and the reflected sunlight is detected simultaneously. Even in this case, as shown by the curves P3 and P4, the undulation pattern in the change in the emission intensity corresponding to the wavelength is approximate to the undulation pattern in the change in the emission intensity of the hydrogen flame represented by the curves P1 and P2.

  That is, the emission intensity of the hydrogen flame decreases in the wavelength region of about 1320 nm to about 1340 nm including the wavelength a1 of about 1338 nm, and in the wavelength region of about 1386 nm to about 1394 nm including the wavelength a2 of about 1388 nm, and the wavelength b1 of about 1351 nm. The undulation pattern of the change that increases in the wavelength region of about 1345 nm to about 1362 nm including the wavelength region and the wavelength region of about 1399 nm to about 1464 nm including the wavelength b2 of about 1437 nm is lost even in the presence of reflected sunlight at the same time. Absent. Therefore, when a flame is detected by near infrared rays in the wavelength region of about 1320 nm to about 1464 nm, the possibility of misdetecting the reflected light of sunlight as a flame is extremely low.

  Moreover, the curve R in the graph of FIG. 7 has shown the light emission intensity | strength corresponding to the wavelength of the near infrared rays emitted from the white LED of the headlight for cars, and the light emission intensity of the white LED in the wavelength region of about 1320 nm to about 1464 nm. There is a portion where (curve R) is higher than the emission intensity of the hydrogen flame (curve P5).

  However, since the change in emission intensity corresponding to the wavelength of the white LED is a gentle curve with less undulations in the wavelength region of about 1320 nm to about 1464 nm as shown by the curve R, the near infrared light of the white LED and the hydrogen flame is Even when detected simultaneously, the undulation pattern in the change in emission intensity corresponding to the wavelength is approximated to the undulation pattern in the change in emission intensity of the hydrogen flame represented by the curve P5, as shown in the curve P6.

  That is, the emission intensity of the hydrogen flame decreases in the wavelength region of about 1320 nm to about 1340 nm including the wavelength a1 of about 1338 nm, and in the wavelength region of about 1386 nm to about 1394 nm including the wavelength a2 of about 1388 nm, and the wavelength b1 of about 1351 nm. The undulation pattern of the increase in the wavelength region of about 1345 nm to about 1362 nm including, and the wavelength region of about 1399 nm to about 1464 nm including the wavelength b2 of about 1437 nm is not lost even in the presence of white LED light at the same time. Therefore, when a flame is detected by near infrared rays in the wavelength region of about 1320 nm to about 1464 nm, the possibility of misdetecting white LED light emitted from a headlight for an automobile as a flame is extremely low.

  The flame monitoring method of the present invention is a flame monitoring method using an undulation pattern in a change in near-infrared emission intensity emitted from a gas flame containing hydrogen atoms in the atoms constituting the molecule as described above. In the procedure, first, one or more of each of A1, B1, A2, and B2 of “Near-infrared emission intensity” of Table 1 emitted from the monitored region is measured.

  A1, B1, A2, and B2 of “Near-infrared emission intensity” in Table 1 were arbitrarily set within a wavelength region of about 1320 nm to about 1340 nm shown in the graphs of FIGS. 5, 6, and 7, respectively. The emission intensity (A1) of the wavelength, the emission intensity (B1) of the wavelength arbitrarily set within the wavelength range of about 1345 nm to about 1362 nm, and the emission intensity (A2) of the wavelength arbitrarily set within the wavelength range of about 1386 nm to about 1394 nm ), And emission intensity (B2) of a wavelength arbitrarily set within a wavelength region of about 1399 nm to about 1464 nm, and it is necessary to set the emission intensity by setting one or more wavelengths for each.

The reason for this is that in the following step, each measured value of near-infrared emission intensity is represented as coordinates in a graph with the horizontal axis being the wavelength and the vertical axis being the emission intensity. For example, between the coordinates of A1 and B1 This is because, when creating an approximate straight line indicating a change in emission intensity, coordinates of emission intensity at at least one or more wavelengths must exist as A1 and B1, respectively.
At that time, as the number of coordinates of A1 and B1 increases, the approximate straight line to be created becomes closer to the actual change state of the emission intensity from A1 to B1. In addition, it is desirable to measure the emission intensity in the wavelength region between A1 and B1 (about 1341 nm to about 1344 nm) and express it as coordinates. This is because, as the number of coordinates increases in such a wavelength region, the approximate straight line to be created becomes closer to the actual change state of the emission intensity from A1 to B1. As described above, it is preferable that the number of coordinates is larger as well between the coordinates B1 and A2 and between the coordinates A2 and B2.
The approximate straight line can be created by a general method such as a least square method.

  Next, each measured value of the obtained near-infrared emission intensity is expressed as coordinates in a graph in which the horizontal axis is wavelength and the vertical axis is emission intensity, and an approximate straight line based on these coordinates is calculated. In this case, if the “approximate straight line pattern” in Table 2 occurs, it is determined that a flame is present and an alarm is issued.

Here, in the graph where the horizontal axis is the wavelength and the vertical axis is the emission intensity, if “the proportional constant of the approximate line is positive”, the approximate line is in a state of rising to the right, and conversely, “the proportional constant of the approximate line is negative. ", The approximate straight line is in a downward-sloping state.
Therefore, when the “approximate straight line pattern” in Table 2 is shown, the approximate straight line between the coordinates of A1 and B1 goes up to the right, the approximate straight line between the coordinates of B1 and A2 goes down to the right, and the coordinates of A2 and B2 The approximate straight line between them rises to the right.
In this way, an approximate straight line is created between the coordinates A1, B1, A2 and B2, and the presence or absence of a flame can be easily and accurately determined by checking the inclination state, that is, the positive / negative state of the proportionality constant of the approximate line. Can be determined.

  In addition, in order to calculate the approximate line by expressing the measured value of the near-infrared emission intensity as coordinates in the graph, it is not necessary to create a graph that can be actually visually recognized or to create an approximate line based on the coordinates, For example, it may be calculated in the state of calculation data by an arithmetic device such as a CPU. Further, even when it is determined that the flame is present based on the “approximate straight line pattern” in Table 2, it is not necessary to create an approximate straight line pattern that can be actually visually recognized. Judgment is sufficient.

  The table of FIG. 8 shows proportional constants of approximate straight lines between predetermined coordinates on the curves in the graphs of FIGS. 5 and 6. That is, in curve P1 (flame of hydrogen 1.0L / min), curve P2 (flame of hydrogen 0.3L / min), curve P3 (reflected light of P1 + Q sunlight) and curve P4 (reflected light of P2 + Q sunlight) , The proportional constants of the approximate straight lines between the coordinates of A1 and B1 (A1-B1), between the coordinates of B1 and A2 (B1-A2), and between the coordinates of A2 and B2 (A2-B2).

Each proportionality constant was calculated by the least square method.
At that time, coordinates were selected for each wavelength of about 1.65 nm between the coordinates from A1-B1 to A2-B2 in order to calculate each proportionality constant. That is, the light emission intensity A1 used for calculating each proportional constant is 1, the number between A1 and B1 (not including A1 and B1) is 5, the number B1 is 9, and the distance between B1 and A2 (B1 and A2). Is 16), A2 is 4, 4 are between A2 and B2 (excluding A2 and B2), and B2 is 22.

  As shown in the P1 column and the P2 column in the table of FIG. 8, the near infrared rays emitted from the hydrogen flame show the “approximate straight line pattern” in Table 2 in the wavelength region of about 1320 nm to about 1464 nm. Further, as shown in the P3 column and the P4 column, the “approximate straight line pattern” in Table 2 is shown even when the hydrogen flame and the reflected sunlight are simultaneously detected.

  Thus, if an approximate straight line is created between the coordinates of A1, B1, A2 and B2, and the state of the inclination, that is, the positive / negative state of the proportionality constant of the approximate straight line is confirmed, the environment where reflected light of sunlight exists It can also be seen that the presence or absence of a hydrogen flame can be easily and accurately determined.

  Therefore, according to the flame monitoring method of the present invention, it is possible to detect flames such as hydrogen gas and hydrocarbon gas that are difficult to see with the naked eye, and in particular, reflected light from sunlight, white LED light from automobile headlights, etc. Even in an existing environment, a flame can be detected with high accuracy and an alarm can be issued, which can contribute to the initial fire extinguishing.

<< First Embodiment of Flame Monitoring Apparatus >>
Next, a first embodiment of the flame monitoring apparatus of the present invention will be described.
The flame monitoring device 1a shown in FIG. 1 includes a detection unit 2a and an information processing unit 3.
The detection unit 2a is configured to collect light from the monitoring target region 22, light transmission cable 23 that transmits light captured by the light collection unit 22, and light transmitted by the light transmission cable 23, from about 1338 nm to about 1338 nm. Near-infrared detection means 21 for extracting near-infrared light including a wavelength region of about 1437 nm and measuring “near-infrared emission intensity” in Table 1 is provided.

The information processing unit 3 includes a storage device 31, a calculation device 32, and an alarm device 33.
The storage device 31 records each measured value of near-infrared emission intensity obtained by the detection unit 2a. Moreover, the arithmetic unit 32 determines the presence or absence of a flame by processing each measured value. Further, the alarm device 33 issues an alarm when the arithmetic device 32 determines that a flame is present.

<Detector>
As shown in FIG. 1, the condensing means 22 is connected to the near-infrared detecting means 21 via the optical transmission cable 23 and is monitored by a lens (not shown) provided in the condensing means 22. Light from the region is configured to be guided to the near infrared detection means 21 through the optical transmission cable 23.

  The condensing means 22 can be configured only with a lens and a member that connects the lens and the optical transmission cable 23, and therefore does not become an ignition source and can be formed extremely small. Therefore, it is difficult to install a near-infrared detector using a normal power source, it can be installed in a place where an ignition source cannot be installed, or in an extremely narrow place. For example, an explosion-proof area of a hydrogen gas supply station It can also be installed in narrow spaces such as the accumulator room and the compressor room.

  As the optical transmission cable 23, a cable made of a single optical fiber, an optical fiber bundle cable in which a plurality of optical fibers are bundled, an image fiber cable in which a plurality of optical fibers are bundled and welded, or the like is used. be able to.

  The near-infrared detecting means 21 extracts near-infrared light including a wavelength region of about 1320 nm to about 1464 nm from the light guided from the light collecting means 22 through the optical transmission cable 23, and the “near-infrared emission intensity” in Table 1 above. One or more of each of A1, B1, A2 and B2 is measured.

In order to extract near infrared rays in the wavelength region of about 1320 nm to about 1464 nm from the light guided by the optical transmission cable 23, a spectroscope or the like may be attached to the near infrared detection means 21. As a spectroscope, NIRQuest512 of Ocean Optics can be preferably used.
Further, in order to measure the emission intensity of the predetermined wavelength of “Near-infrared emission intensity” in Table 1, a near-infrared detection sensor may be used, for example, a flame sensor UVtron (R9533) manufactured by Hamamatsu Photonics Co., Ltd. Can be preferably used.
The measured value data of the near-infrared emission intensity measured by the near-infrared detector 21 is transmitted to the information processing unit 3.

Gas handling facilities such as the hydrogen gas supply station where the flame monitoring device 1a is used continuously monitor not only the occurrence of hydrogen flames but also abnormalities such as intrusion of suspicious persons in order to prevent accidents. Means are needed.
A general-purpose intruder monitoring device that continuously monitors the intrusion of a suspicious person includes a near-infrared detector that detects a near-infrared ray in a wavelength region of approximately 800 to 950 nm and a near-infrared ray that emits a near-infrared ray in the same wavelength region. An infrared irradiator is provided. If near infrared rays having a relatively short wavelength of 800 to 950 nm are used as described above, a general-purpose inexpensive CCD camera can be used as a near-infrared detector, and the cost of the intruder monitoring device can be kept low. is there.

  Here, since the near-infrared detector 21 of the flame monitoring apparatus 1a detects near-infrared light having a wavelength in the wavelength region of about 1338 nm to about 1437 nm, the near-infrared light in the wavelength region of 800 to 950 nm is not imaged. Therefore, according to the flame monitoring device 1a, since the near infrared ray or the reflected light emitted from the near infrared irradiator of the general purpose intruder monitoring device is not erroneously detected as the emission of the hydrogen flame, the above general purpose It is possible and convenient to use with other intruder monitoring devices.

<Information Processing Department>
The information processing unit 3 includes a storage device 31 such as a hard disk, an arithmetic device 32 such as a CPU, and an alarm device 33 such as a display screen or a speaker, and can be configured by a personal computer, for example.

The storage device 31 records each measured value data of near-infrared emission intensity transmitted from the detection unit 2a.
The storage device 31 continuously records the measured value data of near-infrared emission intensity in time series, and erases the old measured value data every time new measured value data is loaded. However, when a hydrogen flame is detected, measurement value data for a predetermined time before and after the flame detection (for example, 24 hours before and after the flame occurrence) is stored. By doing so, it is convenient because it can be used for investigating the cause of the occurrence of flame after the gas is shut off. To do so, either acquire measurement data for a predetermined time after detection of a hydrogen flame and stop updating the data, or move the measurement data for a predetermined time before and after flame detection to another area and update the data after making it impossible to overwrite. Should be continued.

The calculation device 32 represents each measurement value data described above as coordinates in a graph in which the horizontal axis is the wavelength and the vertical axis is the emission intensity, and by calculating an approximate line based on these coordinates, When the “pattern” occurs, it is determined that there is a flame.
The processing by the arithmetic device 32 may be performed immediately based on the measurement value data transmitted from the detection unit 2a, or the measurement value data recorded in the storage device 31 may be called and processed. .

If the arithmetic device 32 determines that a flame is present, the alarm device 33 issues an alarm. The alarm may emit an alarm sound or turn on an alarm lamp, or may display an alarm on a monitor screen such as a personal computer, a portable tablet, or a smartphone.
Further, when it is determined by the arithmetic unit 32 that a flame is present, the storage device 31 operates to store measured data of near-infrared emission intensity for 24 hours before and after the occurrence of the flame.

  As described above, according to the flame monitoring apparatus 1a of the first embodiment, it is possible to detect a flame such as hydrogen gas or hydrocarbon gas that is difficult to visually recognize, and particularly, the reflected light from sunlight or the headlight for automobiles. Even in an environment where white LED light or the like is present, a flame can be detected with high accuracy and an alarm can be issued, which can contribute to the initial extinction of a fire.

<< Second Embodiment of Flame Monitoring Apparatus >>
Next, a second embodiment of the flame monitoring apparatus of the present invention will be described.
The flame monitoring device 1b shown in FIG. 2 includes a detection unit 2b and an information processing unit 3.
The detection unit 2a includes two condensing units 22 and 22 that capture light from the monitoring target area, two optical transmission cables 23 and 23 that transmit the light captured by the respective condensing units 22 and 22, Light incident switching means 24 for selecting one of the lights transmitted by the optical transmission cables 23, 23, and a near infrared ray including a wavelength region of about 1338 nm to about 1437 nm are extracted from the light selected by the light incident switching means 24 And a near-infrared detecting means 21 for measuring the “near-infrared emission intensity” in Table 1 above.

The information processing unit 3 includes a storage device 31, a calculation device 32, and an alarm device 33.
The storage device 31 records each measured value of near-infrared emission intensity obtained by the detection unit 2a. Moreover, the arithmetic unit 32 determines the presence or absence of a flame by processing each measured value. Further, the alarm device 33 issues an alarm when the arithmetic device 32 determines that a flame is present.

According to the flame monitoring device 1b, the light transmitted by the two optical transmission cables 23, 23 can be appropriately selected by the light incident switching means 24 and guided to the near infrared detecting means. For example, the light transmitted by the two transmission cables 23 and 23 can be sequentially switched every few seconds and guided to the near infrared detection means 21. Therefore, two near-flame detection means 21 can monitor two flames, and the flame monitoring apparatus can be made small and excellent in cost.
As a specific example of the incident light switching means 24, an optical switch (FAS0201MS02) manufactured by Optohub, Inc. can be preferably used.

  Note that the flame monitoring device 1b is the same as that of the first embodiment described above only in that two condensing means 22, two optical transmission cables 23, and a light incident switching means 24 are newly provided. It differs from the apparatus 1a in configuration. Therefore, since the components of the flame monitoring device 1b other than these differences are the same as those of the flame monitoring device 1a, the description thereof is omitted here.

<< Third Embodiment of Flame Monitoring Apparatus >>
Next, a third embodiment of the flame monitoring apparatus of the present invention will be described.
The flame monitoring device 1 c shown in FIG. 3 includes a detection unit 2 c and an information processing unit 3.
The detection unit 2a extracts the near-infrared light including the wavelength region of about 1320 nm to about 1464 nm from the light collecting unit 22 that captures light from the monitoring target region and the light captured by the light collecting unit 22, A near-infrared detector 21 for measuring the “infrared emission intensity” is provided.
The near-infrared detecting means 21 has an explosion-proof specification housed in an explosion-proof case 26. Further, the light collecting means 22 may be provided directly on the near infrared detecting means 21, but when the light collecting means 22 does not have an ignition source, the flame monitoring devices 1a and 1b of the first and second embodiments described above. Similarly, it may be connected to the near-infrared detecting means 21 via an optical transmission cable (not shown).

The information processing unit 3 includes a storage device 31, a calculation device 32, and an alarm device 33.
The storage device 31 records each measured value of near-infrared emission intensity obtained by the detection unit 2a. Moreover, the arithmetic unit 32 determines the presence or absence of a flame by processing each measured value. Further, the alarm device 33 issues an alarm when the arithmetic device 32 determines that a flame is present.

In the flame monitoring device 1c, the light collecting means 22 and the near-infrared detection 21 are explosion-proof specifications, and the near-infrared detection unit 21 that may ignite due to the use of a power source is housed in a metal explosion-proof case. Yes.
Therefore, according to the flame monitoring device 1c, for example, when the flame monitoring device 1c is installed in a gas handling facility provided with an explosion-proof area and a non-explosion-proof area, the condensing means 22 and the near-infrared detection means 21 are disposed in the explosion-proof area. Can be placed in. Therefore, it is possible to monitor the monitoring target area where the gas may leak, and to detect the flame with high accuracy.

  The flame monitoring device 1c is structurally different from the flame monitoring device 1a of the first embodiment in that the near infrared detection means 21 is housed in the explosion-proof case 26. Therefore, since the components of the flame monitoring device 1c other than the differences are the same as those of the flame monitoring device 1a, the description thereof is omitted here.

<< Fourth Embodiment of Flame Monitoring Apparatus >>
Next, a fourth embodiment of the flame monitoring apparatus of the present invention will be described.
The flame monitoring apparatus 10 illustrated in FIG. 4 includes a detection unit 4 and an information processing unit 30.

<Detector>
The detector 4 includes a near-infrared detector 21 connected to the condenser 22 via the optical transmission cable 23, an ultraviolet detector 41 connected to the condenser 43 via the optical transmission cable 45, and an optical transmission. Far-infrared detecting means 42 connected to the light collecting means 44 via a cable 46 is provided.
The near-infrared detection means 21 connected to the light collecting means 22 via the optical transmission cable 23 has the same configuration as the detection unit 2a of the flame monitoring device 1a of the first embodiment, and thus description thereof is omitted here. To do.

The condensing means 43 includes a lens (not shown) that receives light from the monitoring target area, and a wavelength converter (not shown) that converts ultraviolet light in the wavelength region of 200 to 400 nm into visible light. It is connected to the detection means 41 via the optical transmission cable 45. With this configuration, when ultraviolet rays in the above-described wavelength region emitted from the flame are incident on the lens, the wavelength converter converts the ultraviolet rays into visible light, passes through the optical transmission cable 45, and is guided to the ultraviolet detection means 41.
When visible light transmitted through the optical transmission cable 45 is weak, it may be guided to the ultraviolet ray detection means 41 after being amplified by an amplifier (not shown).

Here, the reason for converting ultraviolet light to visible light is that a special product for ultraviolet light transmission is required to transmit ultraviolet light as it is with an optical transmission cable, but if it is converted to visible light, it is inexpensive for visible light transmission. This is because a general-purpose product can be used.
The wavelength converter is made of, for example, glass in which a fluorescent material is dispersed, and ultraviolet light incident on the resin excites the fluorescent material to generate visible light, thereby converting the wavelength from ultraviolet light to visible light. It has come to be.
As a specific example of such a visible light converter, functional fluorescent glass “Lumilas” (model number Lumilas-G9) manufactured by Sumita Optical Glass Co., Ltd. can be preferably used.

  Since the condensing means 43 can be composed of only a lens, a wavelength converter, and a member that connects these and the optical transmission cable 45, it does not become an ignition source and can be formed small. Therefore, it can be installed in places where it is difficult to install a general UV sensor that uses a power source, which can be a source of ignition, or in very narrow places. For example, in an explosion-proof area of a hydrogen gas supply station It can also be installed in narrow accumulator rooms and compressor rooms.

The ultraviolet ray detection means 41 is a sensor for detecting ultraviolet rays in a wavelength region of 200 to 400 nm emitted from a gas flame containing hydrogen atoms in the atoms constituting the molecules. Since it is converted into visible light in a specific wavelength region by the converter, the sensor used for the ultraviolet ray detection means 41 needs to be able to detect visible light in the specific wavelength region.
Therefore, the sensor of the ultraviolet ray detection means 41 can be constituted by a light receiving element having sensitivity only to visible light in a specific wavelength region, and a combination of an optical bandpass filter and a photodiode that transmits only visible light in a specific region. You may comprise by.

Ultraviolet rays emitted from gas flames containing hydrogen atoms in the molecules constituting the molecule have emission intensity peaks at wavelengths of 285 nm, 306 nm, and 309 nm, so a wavelength region including any one of the wavelengths indicating these peaks is detected. It is preferable to configure so as to. For example, when it is desired to detect ultraviolet light having a wavelength of 309 nm, the ultraviolet light is converted into visible light by the wavelength converter of the condensing means 43, so that the visible light can be detected by the sensor of the ultraviolet light detecting means 41. That's fine.
As a specific example of the ultraviolet detection means 41, an ultraviolet sensor (model number UV-200) manufactured by Sumita Optical Glass Co., Ltd. can be preferably used.

Next, the condensing unit 44 includes a lens (not shown) that receives light from the monitoring target region, and is connected to the far-infrared detecting unit 42 via the optical transmission cable 46. With this configuration, the far infrared rays emitted by the flame incident on the lens pass through the optical transmission cable 46 and are guided to the far infrared detection means 42.
The condensing means 44 can be constituted only by a lens and a member that connects the lens and the optical transmission cable 46, and therefore does not become a source of ignition, and can be formed extremely small. Therefore, it can be installed in an explosion-proof area or an extremely narrow place.

The far-infrared detection means 42 is a means for detecting a far-infrared ray caused by the heat of the flame, and uses a far-infrared sensor that can detect a far-infrared ray including a wavelength set in a wavelength range of approximately 7 to 14 μm. be able to.
As a specific example of the far-infrared detector 42 (far-infrared sensor), an infrared flame detector (model number: 1RB-EW) manufactured by NITTAN can be suitably used.

<Information Processing Department>
The information processing unit 3 of the flame monitoring device 10 includes a storage device 310, an arithmetic device 320, and an alarm device 330, and can be configured by a personal computer, for example.
The arithmetic device 320 is a case where the detection unit 4 simultaneously detects ultraviolet rays having a wavelength emitted by a gas flame containing hydrogen atoms in atoms constituting the molecule and far infrared rays having a wavelength emitted by the flame, and When the “approximate straight line pattern” in Table 2 is generated by the measured value of the near-infrared emission intensity obtained by the detection unit 4, it is determined that a flame is present.

Therefore, the flame monitoring apparatus 10 can detect the presence of a gas flame containing hydrogen atoms in the atoms constituting the molecules with high accuracy. The reason is that, for example, when the ultraviolet ray detection means 41 erroneously detects the ultraviolet ray contained in the sunlight as the ultraviolet ray emitted from the flame, or when the far infrared ray detection means 42 detects the temperature rise in the monitoring target area due to a cause other than the flame. Even in the case of misdetecting that it is caused by the flame, the detection of the flame by both the detection means 41 and 42 was performed at the same time, and the flame was detected based on the near-infrared emission intensity detected by the near-infrared detection means 21. This is because it is determined that a flame is present only in the case.
The flame monitoring device 10 is configured such that when the arithmetic device 320 determines that a flame is present, the alarm device 330 is activated to issue an alarm.

  Note that the flame detection means based on the near-infrared emission intensity in the flame monitoring device 10 is the same as that in the flame monitoring device 1a of the first embodiment, and thus the description thereof is omitted here.

≪Hydrogen handling facility≫
Next, the hydrogen handling facility of the present invention will be described.
The gas handling facility 5 shown in FIG. 9 is a hydrogen supply station for filling the fuel cell vehicle C with hydrogen gas, and includes a hydrogen gas supply device 53 and a hydrogen gas transport pipe (not shown) and hydrogen gas storage arranged around the hydrogen gas supply device 53. A hydrogen handling device such as a tank is provided, and a management building 51 and a canopy (roof) 52 covering these are installed.
In the vicinity of the hydrogen gas supply device 53 of the gas handling facility 5, there is an explosion-proof area E1 that is prohibited from being set up that can be an ignition source, and areas other than the explosion-proof area E1 are designated as non-explosion-proof areas E2. Yes.

A condensing unit 54 of the flame monitoring device 10 is installed in the explosion-proof area E1 on the lower surface side of the canopy 52, and the condensing unit 54 is connected to the management building 1 in the non-explosion-proof area E2 by an optical transmission cable unit 55. It connects with the main-body part of the flame monitoring apparatus 10 arrange | positioned inside.
The light collecting unit 54 is a unit in which the three light collecting means 23, 43 and 44 shown in FIG. 2 are collectively arranged in one small casing, and the optical transmission cable unit 55 is shown in FIG. The three optical transmission cables 25, 45 and 46 shown are bundled together.

  Further, an intruder monitoring device 56 equipped with a near-infrared irradiator is installed in the non-explosion-proof area E2 on the lower surface side of the canopy 52, and a monitoring target area (not shown) by the intruder monitoring device 56 is This overlaps in many areas with the monitoring target region S by the light collecting unit 54 of the flame monitoring device 10.

When the hydrogen flame F occurs in the monitoring target area S of the gas handling facility 5, the light collecting unit 54 captures the light from the hydrogen flame F, and the optical transmission cable unit 55 detects the near infrared detection means 21 of the detection unit 4. And transmitted to the ultraviolet ray detection means 41 and the far infrared ray detection means 42. Then, the near-infrared detection means 21 detects near-infrared rays in the wavelength region of about 1338 to about 1437 nm emitted from the hydrogen flame, the ultraviolet-ray detection means 41 detects ultraviolet rays having a specific wavelength emitted from the hydrogen flame, and further detects far-infrared rays. When the means 42 detects far infrared rays having a specific wavelength caused by the heat of the hydrogen flame, the computing means 320 determines that a hydrogen flame is present and issues an alarm.
The data detected by the near infrared detection means 21, the ultraviolet detection means 41, and the far infrared detection means 42 is stored in the storage device 310 for 24 hours before and after the generation of the hydrogen flame F.

Here, since the condensing unit 54 does not have anything that can be an ignition source, it is arranged in the explosion-proof area E1 so that the entire monitoring target area S can be monitored from a short distance within approximately 5 m. Therefore, even a small hydrogen flame with low emission intensity can be detected.
Further, in the flame monitoring device 10, the main body part other than the light collecting unit 54 and the optical transmission cable unit 55 is disposed in the management building 51 in the non-explosion-proof area E <b> 2. There is no need, and the gas handling facility 5 can be made cost-effective.

The intruder monitoring device 56 installed in the non-explosion-proof area E2 of the gas handling facility 5 irradiates a near-infrared image pickup device that picks up a near-infrared image including a wavelength region of approximately 800 to 950 nm and a near-infrared ray in the same wavelength region. It has a near infrared irradiator.
The intruder monitoring device 56 is a widely used intruder monitoring device that monitors and monitors an intruder with a near-infrared image pickup device. At night, the intruder monitoring device 56 is approximately 800 to 950 nm from the near-infrared irradiator. A near infrared ray in the wavelength region is irradiated, and the reflected light is captured by a near infrared image pickup device.

Although the hydrogen flame monitoring device 10 installed in the gas handling facility 5 includes the near infrared detection means 21, it detects near infrared rays in a wavelength region of about 1338 nm to about 1437 nm. The near infrared ray of 800 to 950 nm irradiated from the near infrared irradiator is not detected.
Therefore, the flame monitoring device 10 is a general-purpose intruder monitoring device 56 because there is no possibility of erroneously detecting the irradiation light or the reflected light of the near-infrared irradiation device of the intruder monitoring device 56 as a near infrared ray due to a hydrogen flame. It can be used together with it and is convenient.

  INDUSTRIAL APPLICABILITY The present invention can be widely applied to monitoring of a flame in a gas handling facility that handles hydrogen gas, hydrocarbon gas, or the like where it is difficult to see a flame during combustion.

1a, 1b, 1c, 10 .. Flame monitoring device 2a, 2b, 2c ..Detection unit 21 ..Near-infrared detection means 22 ..Condensing means 23 ..Optical transmission cable 24 ..Light incident switching means 25. Electric cable 26 ..Explosion-proof case 3,30 ..Information processing unit 31,310 ..Storage device 32,320 ..Operating device 33,330 ..Alarm unit 4 ..Detection unit 41 ..Ultraviolet detection means 42. Far-infrared detection means 43, 44 ·· Condensing means 45, 46 ·· Optical transmission cable 5 · · Gas handling facility (hydrogen gas supply station)
51 ..Management building 52 ..Canopy 53 ..Hydrogen gas supply device 54 ..Condensing unit 55 ..Light transmission cable unit 56 ..Intruder monitoring device C ..Fuel cell vehicle F ..Hydrogen flame E1. Explosion-proof area E2 ・ ・ Non-explosion-proof area S ・ ・ Monitored area

Claims (13)

A flame monitoring method for detecting a flame of a gas containing a hydrogen atom in an atom constituting a molecule, which is 1 for each of A1, B1, A2, and B2 of the following “near-infrared emission intensity” emitted from a monitored region When the following “approximate straight line pattern” is generated by calculating the approximate straight line by measuring two or more and expressing the obtained measurement values as coordinates in the graph where the horizontal axis is wavelength and the vertical axis is emission intensity. A flame monitoring method characterized by issuing an alarm upon determining that the flame is present.
[Near-infrared emission intensity]
A1: Light emission intensity at a wavelength arbitrarily set within a wavelength region of about 1320 nm to about 1340 nm.
B1: Light emission intensity at a wavelength arbitrarily set within a wavelength region of about 1345 nm to about 1362 nm.
A2: emission intensity at a wavelength arbitrarily set within a wavelength region of about 1386 nm to about 1394 nm.
B2: Emission intensity at a wavelength arbitrarily set within a wavelength region of about 1399 nm to about 1464 nm.
[Approximate line pattern]
The proportionality constant of the approximate line based on the coordinates of A1 and B1 is positive, and
The proportionality constant of the approximate line based on the coordinates of B1 and A2 is negative, and
The proportionality constant of the approximate line based on the coordinates of A2 and B2 is positive. A flame monitoring device for detecting a flame of a gas containing hydrogen atoms in atoms constituting a molecule,
Condensing means for capturing light emitted from the monitoring target area, and one or more of each of A1, B1, A2, and B2 of the following “near infrared emission intensity” included in the light captured by the condensing means A detection unit comprising a near-infrared detection means for measuring, and
A storage device for recording measured values of near-infrared emission intensity obtained by the detection unit;
The above measured values are expressed as coordinates in a graph in which the horizontal axis is wavelength and the vertical axis is emission intensity, and by calculating an approximate line, it is determined that the above flame exists when the following "approximate straight line pattern" occurs. An information processing unit comprising: an arithmetic device that performs an alarm; and an alarm device that issues an alarm when the arithmetic device determines that the flame is present,
A flame monitoring device comprising:
[Near-infrared emission intensity]
A1: Light emission intensity at a wavelength arbitrarily set within a wavelength region of about 1320 nm to about 1340 nm.
B1: Light emission intensity at a wavelength arbitrarily set within a wavelength region of about 1345 nm to about 1362 nm.
A2: emission intensity at a wavelength arbitrarily set within a wavelength region of about 1386 nm to about 1394 nm.
B2: Emission intensity at a wavelength arbitrarily set within a wavelength region of about 1399 nm to about 1464 nm.
[Approximate line pattern]
The proportionality constant of the approximate line based on the coordinates of A1 and B1 is positive, and
The proportionality constant of the approximate line based on the coordinates of B1 and A2 is negative, and
The proportionality constant of the approximate line based on the coordinates of A2 and B2 is positive.   3. The flame monitoring apparatus according to claim 2, wherein the condensing means has no ignition source and is connected to the near-infrared detecting means via an optical transmission cable.   The light collecting means does not have an ignition source and is provided in a plurality, and is connected to the light incident switching means via an optical transmission cable provided for each light collecting means, and is transmitted by each optical transmission cable. The flame monitoring device according to claim 2, wherein the light to be transmitted is appropriately selected by the incident light switching means and guided to the near infrared detection means.   The flame monitoring device according to claim 2, wherein the near-infrared detection means is explosion-proof. The detection unit includes a condensing unit that captures light emitted from the monitoring target region, and a far-infrared ray that is emitted from a flame of a gas containing hydrogen atoms in the atoms constituting the molecules included in the light captured by the condensing unit. And a far-infrared detecting means for detecting far-infrared rays including a wavelength set in the wavelength region of
The arithmetic unit of the information processing unit is a case where far-infrared rays including the set wavelength are detected in the detection unit, and the measured value of the near-infrared emission intensity obtained by the detection unit, 6. The flame monitoring apparatus according to claim 2, wherein when the “approximate straight line pattern” is generated, it is determined that the flame exists. The detection unit includes a condensing unit that captures light emitted from the monitoring target region, and an ultraviolet ray emitted from a gas flame containing hydrogen atoms in the atoms constituting the molecules contained in the light captured by the condensing unit. An ultraviolet ray detection means for detecting ultraviolet rays including a wavelength set in the wavelength region;
The arithmetic unit of the information processing unit is a case where ultraviolet rays including the set wavelength are detected in the detection unit, and the measured value of the near-infrared emission intensity obtained by the detection unit, 6. The flame monitoring apparatus according to claim 2, wherein when the “approximate straight line pattern” occurs, it is determined that the flame is present. The detection unit includes a condensing unit that captures light emitted from the monitoring target region, and a far-infrared ray that is emitted from a flame of a gas containing hydrogen atoms in the atoms constituting the molecules included in the light captured by the condensing unit. A far-infrared detecting means for detecting far-infrared light including a wavelength set within the wavelength region of the light, and a gas flame containing hydrogen atoms in the atoms constituting the molecules contained in the light captured by the light collecting means. An ultraviolet ray detecting means for detecting ultraviolet rays including a wavelength set within a wavelength region of the ultraviolet ray to be provided,
The arithmetic unit of the information processing unit is a case where the far infrared ray including the set wavelength and the ultraviolet ray including the set wavelength are simultaneously detected in the detection unit, and obtained by the detection unit The flame monitoring according to any one of claims 2 to 5, wherein when the "approximate straight line pattern" is generated based on a measured value of near-infrared emission intensity, it is determined that the flame is present. apparatus.   The flame monitoring apparatus according to claim 6 or 8, wherein a condensing means is connected to the far-infrared detecting means via an optical transmission cable, and the condensing means has no ignition source.   9. The flame monitor according to claim 7, wherein a condensing means is connected to the ultraviolet ray detecting means via an optical transmission cable, and the condensing means has no ignition source. apparatus.   The flame monitoring apparatus according to claim 10, wherein the ultraviolet ray condensing means includes a wavelength converter that converts the ultraviolet ray into visible light. Explosion-proof area and non-explosion-proof area are provided, and it is a facility for handling gas containing hydrogen atoms in the atoms constituting the molecule,
The flame monitoring device according to any one of claims 3, 4, 9, 10, or 11 is installed,
Among the components of the flame monitoring device, the light collecting means is arranged in the explosion-proof area,
The other components including the near-infrared detecting means, the incident light switching means, the ultraviolet detecting means, or the far-infrared detecting means connected to the condensing means via the optical transmission cable are disposed in the non-explosion-proof area. Characteristic gas handling facility. A facility for handling a gas containing hydrogen atoms in atoms constituting a molecule, wherein the flame monitoring device and the intruder monitoring device according to any one of claims 2 to 11 are installed,
At least part of the monitoring area of the flame monitoring device and the monitoring area of the intruder monitoring device overlap,
The intruder monitoring device is near infrared including a wavelength set within a wavelength region of less than 1320 nm, and does not substantially overlap with the near infrared wavelength region detected by the near infrared detecting means of the flame monitoring device. A gas handling facility comprising a near-infrared irradiator that emits near-infrared rays in the wavelength region.

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