JP2014211318A - Slime monitoring device, slime monitoring method, slime remover addition device, and slime remover addition method - Google Patents

Abstract

The present invention relates to a slime monitoring device, a slime monitoring method, a slime remover addition device, and a slime remover addition method capable of accurately grasping a continuous change in the state of slime adhesion in real time. The purpose is to provide. A flowing water pipe that is transparent and capable of transmitting laser light, an obstacle that is disposed in the flowing water pipe and changes the flow of water flowing in the flowing water pipe, and flows around the obstacle. Imaging that acquires image data by continuously imaging the flow of water around the obstacle 27 irradiated with the sheet-shaped laser light 31 and the obstacle 27 irradiated with the sheet-shaped laser light 31 with respect to water. And an analysis unit 34 for analyzing the state of slime adhesion in the running water pipe 26 by performing analysis based on the image data. [Selection] Figure 1

Description

  The present invention relates to a slime monitoring device that continuously monitors fouling caused by slime, which is a problem in water circulation systems such as an open cooling water system, a sealed cooling water system, a membrane concentrated water system, a paper pulp production process system, and a wastewater treatment process system, and a slime And a slime remover addition apparatus for adding a slime remover according to slime fouling, and a slime remover addition method.

  In water circulation systems such as open cooling water systems, sealed cooling water systems, membrane concentrated water systems, pulp and paper manufacturing process systems, and wastewater treatment process systems, microorganisms grow and become sticky at the interface between pipes and heat exchangers and water. A fouling disorder occurs due to slime, which is an adhering substance that has been grown by involving inorganic substances and the like in the secretions.

  Specific examples of the fouling failure include, for example, a decrease in the heat efficiency of the heat exchanger and corrosion of pipes and heat exchangers caused by organic acids and active oxygen species secreted in the lower part of the slime. . Moreover, if corrosion of piping, heat exchangers, etc. progresses, there is a risk of causing a penetration accident.

In addition, the slime itself may block the film, or the exfoliation of the slime may block the piping or the like. Furthermore, in the pulp and paper manufacturing process, the slime exfoliation causes a reduction in product quality.
In order to avoid the above-described slime fouling failure, a process of adding a slime remover (antibacterial agent) to the target aqueous system is often performed.

However, the degree of fouling failure of slime varies depending on the quality of water supplied to the target water system and the operating conditions. Also, slime fouling failure always changes due to changes in environment such as temperature and driving conditions.
Accurately grasping the state of slime adhesion is an important factor for proper water treatment.

  As a method of monitoring the slime adhesion in the water system, immerse a test piece made of a slide glass or rubber plate in the water system, pull it up at any time, peel off the adhering slime, and the amount of slime adhesion The method of measuring is widely performed.

  Although such a method can roughly grasp the slime adhesion state, it is difficult to make the flow condition of the place where the test piece is immersed constant, and it is difficult to accurately grasp the slime adhesion state. Have difficulty. Further, it is impossible to continuously grasp the change in the slime adhesion state.

  As a method that can accurately grasp the slime adhesion status, for example, by connecting a plurality of short pipes in series, the flow conditions of the slime adhesion part are controlled to be constant, and the short pipes are sequentially removed to reduce the amount of slime adhesion. There are methods for evaluation (see, for example, Patent Document 1 and Non-Patent Document 1).

  In such a method, water is continuously passed through a short tube series, the water flow is stopped at an arbitrary time, a specific short tube is pulled out, the adhering slime is peeled off, and the amount of adhesion is measured.

As a method of grasping the continuous change of the slime adhesion state in real time, for example, without directly measuring the amount of slime adhesion, the differential pressure change at both ends of the straight pipe due to the slime adhesion is continuously measured. There is a method (for example, see Non-Patent Document 2).
In this method, since the amount of slime deposited is indirectly estimated from the pressure difference, it is necessary to control the flow rate condition very strictly.

JP-T 6-509640

W. G. Characklis et. al. EPLI CS-1554 Project 902-1 Final Report. Sept. , 1980 Biofilm development and description. NACE Standard RP0189-89, NACE International, Houston, USA.

  However, in the methods disclosed in Patent Literature 1 and Non-Patent Literature 1, it is possible to arbitrarily set the flow rate condition, so it is possible to more accurately grasp the slime adhesion state under any condition. However, it is impossible to grasp in real time the continuous change in the state of slime adhesion.

  Further, in the method disclosed in Non-Patent Document 2, since the flow velocity change greatly affects the pressure change, generally, an expensive metering valve or the like is used to control the flow velocity. Can not be absorbed. In other words, even if no slime is attached, the reference value changes due to changes in flow rate conditions (in other words, due to the influence of external environmental changes), so it is difficult to accurately grasp the state of slime attachment. Met.

  Therefore, the present invention provides a slime monitoring device, a slime monitoring method, a slime remover addition device, and a slime remover addition method capable of accurately grasping a continuous change in the slime adhesion state in real time. The purpose is to provide.

  In order to solve the above-described problem, according to one aspect of the present invention, a transparent water-flow pipe capable of transmitting laser light, and an obstacle that changes the flow of water that is disposed in the water-flow pipe and that flows through the water-flow pipe. A laser irradiation unit that irradiates a sheet-shaped laser beam to the object, the water flowing around the obstacle, and the flow of water around the obstacle irradiated with the sheet-shaped laser beam is continuously An image pickup unit that picks up an image and acquires image data, and an analysis unit that analyzes an attachment state of slime attached in the flowing water pipe by performing analysis based on the image data. A slime monitoring device is provided (claim 1).

  The obstacle is disposed on a surface of the inner surface of the flowing water pipe that is located on a bottom side of the flowing water pipe, and the laser irradiation unit is disposed above the flowing water pipe so as to face the obstacle. And the said imaging part may be arrange | positioned in the position which can image the flow of the said water from the side surface of the said flowing water piping which cross | intersects the said sheet-like laser beam (Claim 2).

  Further, the sheet-like laser beam may be a green laser beam.

  Moreover, you may have a display part on which the said image data and the result analyzed by the said analysis part are displayed.

  Further, the imaging unit may be a high-speed camera.

  Moreover, slime removal is carried out in the water tank which supplies the water to the flowing water pipe according to the slime monitoring device according to any one of claims 1 to 5 and the analysis result based on the image data. And a control unit for controlling whether or not the agent is added (Claim 6).

Further, according to another aspect of the present invention, the step of irradiating the sheet-form laser light to the water flowing around the obstacle disposed in the flowing water pipe transparent and capable of transmitting the laser light,
By continuously capturing the flow of the water around the obstacle irradiated with the sheet-like laser light and acquiring image data, and performing analysis based on the image data, And a step of analyzing the adhesion state of the slime adhering to the liquid. (Claim 7).

  In addition, a green laser beam may be used as the sheet-like laser beam, and the image data and a result analyzed by the analysis unit may be displayed on a display unit in real time.

  Further, data captured by a high-speed camera may be used as the image data.

  According to another aspect of the present invention, the step of irradiating the sheet-shaped laser light onto the water flowing around the obstacle disposed in the flowing water pipe that is transparent and capable of transmitting the laser light, and the sheet-shaped laser light The flow of water around the obstacle that has been irradiated is continuously imaged, and image data is acquired, and analysis is performed based on the image data, so that slime adhering to the flowing water pipe When it is determined that it is necessary to add a slime remover into the water tank that supplies the water to the flowing water pipe, based on the result of the analysis based on the image data and the step of analyzing the adhesion state, the water tank And a step of adding the slime remover therein. A method for adding a slime remover is provided.

  Further, a green laser beam may be used as the sheet-like laser beam, and the image data and a result analyzed by the analysis unit may be displayed on a display unit in real time.

  Further, data captured by a high-speed camera may be used as the image data.

  Further, in the step of adding the slime removing agent, an amount of the slime removing agent may be added in the water tank according to the amount of the slime attached (claim 13).

According to the present invention, by continuously capturing the flow of water around the obstacle irradiated with the sheet-shaped laser light, image data is acquired, and analysis is performed based on the image data. It becomes possible to analyze in real time the state of slime adhesion in the pipe.
Thereby, the continuous change of the adhesion state of slime can be grasped accurately in real time.

It is a figure which shows schematic structure of the slime removal agent addition apparatus which concerns on embodiment of this invention. It is the figure which looked at the part enclosed by the area | region A among the slime monitoring apparatuses shown in FIG. 1 from the C direction.

  Embodiments to which the present invention is applied will be described below in detail with reference to the drawings. The drawings used in the following description are for explaining the configuration of the embodiment of the present invention. The size, thickness, dimensions, and the like of each part shown in the drawings are the actual slime monitoring device and slime removing agent addition device. It may be different from the dimensional relationship.

(Embodiment)
FIG. 1 is a diagram showing a schematic configuration of a slime remover addition apparatus according to an embodiment of the present invention. In FIG. 1, A indicates a region (hereinafter referred to as “region A”) surrounding a part of the constituent elements of the slime monitoring device 23, and B indicates a direction in which cooling water (water) flows (hereinafter “B direction”). It is shown). In FIG. 1, D indicates a direction in which the imaging unit 33 captures an image (hereinafter referred to as “D direction”).
FIG. 2 is a side view of the portion surrounded by region A in the slime monitoring apparatus shown in FIG. In FIG. 2, the same components as those in the slime removing agent adding apparatus 10 of the embodiment shown in FIG.

  Referring to FIGS. 1 and 2, the slime removing agent adding device 10 of the present embodiment includes a circulation water tank 11, a cooling water supply line 13, a pump 14, a cooling water recovery line 15, and a slime removing agent. Tank 17, slime removing agent supply line 19, automatic valve 21, slime monitoring device 23, and analysis control device 24.

The circulation water tank 11 is connected to a cooling water supply line 13 and a cooling water recovery line 15. The circulation water tank 11 is a tank for storing cooling water cooled by a cooling device (not shown).
The cooled cooling water is supplied to the cooling water supply line 13 by the pump 14, and then contributes to the cooling of the object to be cooled (not shown) via the slime monitoring device 23.
And the cooling water which contributed to cooling of a cooling target object (not shown) is collect | recovered by the water tank 11 for circulation via the cooling water collection | recovery line 15. FIG.

One end of the cooling water supply line 13 is connected to the circulation water tank 11. The pump 14 is provided in the cooling water supply line 13. The cooling water supply line 13 is a line for transporting cooling water for cooling an object to be cooled (not shown).
The cooling water supply line 13 may be configured using a transparent pipe, or may be configured using a pipe that is not transparent.

The pump 14 supplies the cooling water cooled in the circulation water tank 11 to the slime monitoring device 23 via the cooling water supply line 13.
The cooling water recovery line 15 is a line for recovering cooling water (cooling water whose temperature has increased) that has contributed to cooling of an object to be cooled (not shown). One end of the cooling water recovery line 15 is connected to the other end of the cooling water supply line 13, and the other end is connected to the circulation water tank 11.
The cooling water recovery line 15 may be configured using a transparent pipe, or may be configured using a pipe that is not transparent.

The slime removing agent tank 17 is a tank in which a slime removing agent (antibacterial agent) for removing slime is stored. The slime remover tank 17 is connected to the circulation water tank 11 via a slime remover supply line 19.
As the slime remover, for example, chlorinated isothiazolone (Cl-MIT) can be used.
One end of the slime remover supply line 19 is connected to the slime remover tank 17, and the other end is connected to the circulation water tank 11.

The automatic valve 21 is provided in the slime remover supply line 19. The automatic valve 21 is electrically connected to the analysis control device 24. Thereby, the automatic valve 21 is controlled by the analysis control device 24.
When the automatic valve 21 is closed, the slime remover in the slime remover tank 17 is not supplied to the cooling water in the circulation water tank 11.
On the other hand, when the automatic valve 21 is opened by the analysis control device 24, the slime remover in the slime remover tank 17 is supplied to the cooling water in the circulation water tank 11.

  The slime monitoring device 23 includes a running water pipe 26, an obstacle 27, a laser irradiation unit 29, an imaging unit 33, an analysis unit 34, and a display unit 36.

The flowing water pipe 26 is provided in the cooling water supply line 13. The cooling water introduced into the flowing water pipe 26 via the cooling water supply line 13 positioned upstream of the flowing water pipe 26 flows through the flowing water pipe 26, and then the cooling water supply line 13 positioned downstream of the flowing water pipe 26. To be derived.
The flowing water pipe 26 is configured by a pipe that is transparent and can transmit laser light so that the state of slime adhesion can be visualized and the laser light applied to the water flowing around the obstacle 27 can be photographed.

As a material of the flowing water pipe 26, for example, an acrylic resin or a vinyl chloride resin can be used. Moreover, as the shape of the flowing water piping 26, for example, any shape may be used as long as the obstacle 27 can be disposed therein and a path through which the cooling water flows is provided.
Specifically, as the shape of the flowing water pipe 26, for example, a cylindrical shape or a cylindrical shape whose cutting surface is a quadrangle can be used.

  The obstacle 27 is disposed (fixed) on a surface 26 b located on the bottom side of the flowing water pipe 26 among the inner surface 26 a of the flowing water pipe 26. The shape of the obstacle 27 may be any size and shape that can change the flow of the cooling water flowing in the flowing water pipe 26 (specifically, form a portion in which the flow of the cooling water becomes slow). Good.

  By arranging (fixing) the obstacle 27 having such a shape on the surface 26b of the flowing water pipe 26, a portion where the flow of the cooling water is delayed is formed around the obstacle 27. Can be easily generated, and the flow of the cooling water flowing in the flowing water pipe 26 can be changed by the slime.

The cross-sectional area of the obstacle 27 in the plane direction orthogonal to the B direction (the direction in which the cooling water flows) ranges from 10 to 50% of the cross-sectional area defined by the inner surface 26a of the flowing water pipe 26 in the plane direction orthogonal to the B direction. It is good to set it to be inside.
Further, as the material of the obstacle 27, a material excellent in water resistance may be used. As a material of the obstacle 27, for example, an acrylic resin can be used.
In the above description, the case where the obstacle 27 and the flowing water pipe 26 are separated is described as an example. However, the obstacle 27 and the flowing water pipe 26 may be integrated.

The laser irradiation unit 29 includes a laser transmitter (not shown) and a cylindrical lens (not shown) that converts a laser beam transmitted from the laser transmitter into a sheet-like laser beam 31 or a cylindrical lens (not shown) and a beam. It has a combination with an ink spander (not shown).
The laser irradiation unit 29 is disposed above the running water pipe 26 so as to face the obstacle 27. The laser irradiation unit 29 irradiates the obstacle 27 and the cooling water flowing around the obstacle 27 with the sheet-like laser light 31 through the flowing water pipe 26.
The laser irradiation unit 29 irradiates the sheet-like laser beam 31 so that the sheet-like laser beam 31 intersects (orthogonally in the case of FIG. 1) with respect to the direction D (the direction in which the imaging unit 33 takes an image).

  As the sheet-like laser beam 31 (in other words, the laser beam transmitted from the laser transmitter), the laser beam (eg, YAG laser beam, A copper vapor laser beam, a semiconductor laser beam, or the like).

As the wavelength of the sheet-like laser beam 31, for example, a wavelength range of 440 (purple) to 650 nm (red) can be used. By using the sheet-like laser light 31 having such a wavelength band, the flow of the cooling water flowing around the obstacle 27 can be visualized.
The wavelength of the sheet-like laser beam 31 is most preferably, for example, a wavelength of 532 nm (green).
Thus, by using the sheet-like laser light 31 having a wavelength of 532 nm (green), the green color is the color with the highest sensitivity to human color (specific visual sensitivity). It is possible to recognize the state of adhesion.

  Moreover, the output of the laser beam of a laser transmitter (not shown) can be suitably selected within the range of 200 to 1000 nm, for example. If the output of the laser beam is within the range, the sheet-like laser beam 31 can be sufficiently visualized.

  The imaging unit 33 is disposed at a position where the flow of cooling water can be imaged from the side surface of the flowing water pipe 26 that intersects (orthogonally in the case of FIG. 1) with the sheet-like laser light 31. The imaging unit 33 continuously captures the flow of cooling water around the obstacle 27 irradiated with the sheet-like laser light, and acquires image data. The imaging unit 33 transmits the captured image data to the analysis control device 24 in real time.

  As the imaging unit 33, for example, a high-speed camera may be used. As described above, by using a high-speed camera as the imaging unit 33, the image data captured by the imaging unit 33 can be easily analyzed by the analysis unit 34.

The analysis unit 34 is one of the components of the analysis control device 24. The analysis unit 34 performs analysis based on image data continuously acquired by the imaging unit 33 (image data related to the flow of cooling water around the obstacle 27 described later), thereby adhering in the flowing water pipe 26 described later. Analyze the adhesion state of the slime.
The analysis unit 34 performs analysis using, for example, an image processing technique called PIV (Particle Image Velocity).

The analysis unit 34 is preferably capable of performing digital image processing, extracting instantaneous and multi-point velocity information regarding the flow of the cooling water around the obstacle 27, and analyzing the flow distribution of the cooling water.
By using such a thing as the analysis part 34, since it becomes possible to perform a vector calculation, a linear flow analysis, etc. in a time series at all points on the photographing screen, a change in the flow of the cooling water due to the adhesion of slime can be observed. Numerical analysis is possible.

The display unit 36 is one of the components of the analysis control device 24. The display unit 36 displays the image data captured by the imaging unit 33, the analysis result of the analysis unit 34, and the like in real time.
Thus, by having the display unit 36 that displays the image data captured by the imaging unit 33 and the analysis result of the analysis unit 34 in real time, the worker can easily recognize the slime adhesion state.
Further, by continuously displaying the image data on the display unit 36 immediately after the addition of the slime remover as the image data, the operator can visually confirm how the slime is peeled off.
As the display unit 36, a display (for example, a liquid crystal panel) capable of displaying the image data is used.

According to the slime monitoring device of the present embodiment, the flowing water pipe 26 that is transparent and capable of transmitting laser light, and the obstacle 27 that is disposed in the flowing water pipe 26 and changes the flow of the cooling water flowing in the flowing water pipe 26. The laser irradiation unit 29 for irradiating the sheet-shaped laser light 31 to the cooling water flowing around the obstacle 27 and the flow of the cooling water around the obstacle 27 irradiated with the sheet-shaped laser light 31 are continuously provided. By having an image pickup unit 33 that picks up images and obtains image data, and an analysis unit 34 that analyzes the attachment state of slime attached in the flowing water pipe 26 by performing analysis based on the image data, It is possible to analyze in real time the state of slime adhesion in the running water pipe 26.
Thereby, the continuous change of the adhesion state of slime can be grasped accurately in real time.

In the slime monitoring method using the slime monitoring device 23 having the above-described configuration, the sheet-like laser light 31 is applied to the cooling water flowing around the obstacle 27 disposed in the flowing water pipe 26 that is transparent and can transmit the laser light. A step of irradiating, a step of continuously capturing the flow of cooling water around the obstacle 27 irradiated with the sheet-like laser light 31 and acquiring image data, and performing an analysis based on the image data And a step of analyzing the adhesion state of the slime adhered in the flowing water pipe 26.
By using such a slime monitoring method, it is possible to accurately grasp a continuous change in the state of slime adhesion in real time.

Further, in the above slime monitoring method, by using green laser light as the sheet-like laser light 31, and having the process of displaying the image data and the result analyzed by the analysis unit 34 on the display unit 36 in real time, The person can easily grasp the continuous change of the slime adhesion state in real time.
In the slime monitoring method, the image data can be easily analyzed by the analysis unit 34 by using data captured by a high-speed camera as the image data.

  The analysis control device 24 includes the analysis unit 34 and the display unit 36 described above, and the control unit 38. The analysis control device 24 is electrically connected to the laser irradiation unit 29, the imaging unit 33, and the automatic valve 21.

  The control unit 38 performs overall control of the slime remover adding device 10. The control unit 38 determines whether the flow pipe 26 and the cooling water supply line correspond to the result of the analysis based on the image data (specifically, the state of slime adhesion determined from the flow velocity of the water flowing around the obstacle 27). It is determined whether or not a slime remover is added to the cooling water stored in the circulating water tank 11 that supplies the cooling water to 13, and the automatic valve 21 is controlled based on the result of the determination.

Specifically, the control unit 38 determines, for example, whether or not to add first threshold data (slime remover) stored in advance in a storage unit (not shown) in the analysis control device 24. Based on the data on the flow rate of water), it is determined whether or not the slime remover is added to the cooling water stored in the circulation water tank 11, and the opening / closing operation of the automatic valve 21 is controlled.
This eliminates the need for the worker to always be near the slime remover addition device 10 and automatically applies the slime remover into the circulation water tank 11 when the slime is generated to the extent that the slime remover needs to be added. Can be supplied at.

Further, since it becomes possible to automatically supply the slime remover into the circulation water tank 11, when slime is generated to the extent that it is necessary to add the slime remover, the slime removal is immediately removed into the circulation water tank 11. An agent can be supplied to remove slime.
Thereby, since it becomes possible to maintain the cooling water of a clean state, the fall of the function as a cooling water resulting from a slime can be suppressed.

  Further, for example, in addition to the first threshold value data, a plurality of preliminaries for prescribing the addition amount of the slime removing agent to be added to the circulating water tank 11 in a storage unit (not shown) in the analysis control device 24. Second threshold data (data relating to the amount of slime adhesion) is stored, and when it is determined to add a slime remover based on the first threshold data, it is based on a plurality of second threshold data. It is good to make a decision.

Thereby, the analysis control device 24 can control the automatic valve 21 so that the opening degree is in accordance with the amount of the slime removing agent added to the cooling water stored in the circulation water tank 11. Therefore, it is possible to suppress the addition of an unnecessarily large amount of slime removing agent in the circulation water tank 11.
Moreover, since it becomes possible to add a required quantity of slime removal agents, the operating cost of the slime removal agent addition apparatus 10 can be reduced compared with the conventional apparatus.
As the analysis control device 24 configured as described above, for example, a personal computer can be used.

  According to the slime remover addition device of the present embodiment, slime removal is performed in the circulation water tank 11 that supplies the cooling water to the flowing water pipe 26 according to the result of the analysis based on the slime monitoring device 23 and the image data. And a control unit 38 that controls whether or not an agent (antibacterial agent) is added, thereby determining the result of analysis based on the image data (specifically, the flow rate of water flowing around the obstacle 27) The slime removal agent is determined whether or not to add to the cooling water stored in the circulating water tank 11 for supplying the cooling water to the flowing water pipe 26 and the cooling water supply line 13 according to the state of the slime attached). The automatic valve 21 can be controlled based on the result of the determination.

  As a result, even when the worker is not near the slime remover addition device 10, when slime is generated to the extent that the slime remover needs to be added, the slime remover is automatically supplied into the circulation water tank 11 immediately. As a result, it is possible to keep the cooling water in a clean state with almost no slime, so that it is possible to suppress a decrease in the function as the cooling water due to the slime.

The slime remover addition method using the slime remover addition apparatus 10 having the above-described configuration is a sheet-like laser that is applied to cooling water that flows around an obstacle 27 disposed in a flowing water pipe 26 that is transparent and capable of transmitting laser light. A step of irradiating the light 31, a step of continuously capturing the flow of cooling water around the obstacle 27 irradiated with the sheet-like laser light, obtaining image data, and performing analysis based on the image data Thus, the slime removing agent is added to the circulating water tank 11 for supplying the cooling water to the flowing water pipe 26 based on the result of the analysis based on the image data and the process of analyzing the adhesion state of the slime attached in the flowing water pipe 26. Adding a slime remover in an amount corresponding to the adhesion of the slime when it is determined that it is necessary to do so.
Such a slime remover addition method can obtain the same effect as the slime remover addition apparatus 10.

  In the slime remover addition method, as described in the slime monitoring method described above, the green laser beam is used as the sheet-like laser beam 31, and the image data and the result analyzed by the analysis unit 34 are displayed. There may be a step of displaying in real time on the unit 36, and data captured by a high-speed camera may be used as the image data.

  The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to such specific embodiments, and within the scope of the present invention described in the claims, Various modifications and changes are possible.

(Example)
In the example, a test for demonstrating the effect of the present invention was performed using the slime monitoring device 23 shown in FIG.
Here, a specific configuration of the slime monitoring device 23 used in the test will be described. As the flowing water pipe 26, a transparent pipe made of an acrylic resin having a width of 5 cm, a height of 5 cm, and a length of 30 cm was used.

  As the obstacle 27, a cube made of acrylic resin having a width of 2 cm, a height of 2 cm, and a depth of 2 cm was used. The obstacle 27 was fixed to a surface 26b located on the bottom side of the inner surface 26a located at the center of the running water pipe 26.

As the laser irradiation part 29, what has a laser transmitter (not shown) and a cylindrical lens (not shown) was used. As a laser beam irradiated by a laser transmitter (not shown), a green laser beam having an output of 300 mW and a wavelength of 532 nm was used.
Further, the sheet-like laser light 31 was formed by irradiating the green laser light so as to pass through the beam expander.
As the imaging unit 33, C844-05G manufactured by Hamamatsu Photonics Co., Ltd. was used as a high-speed camera.

Next, a method for creating test water will be described.
First, by passing the town water of Shimotsuga-gun Nogi-cho, Tochigi Prefecture through a column made of activated carbon, residual chlorine contained in the town water was removed, and then a substrate for accelerating the adhesion of slime was added.
As the substrate, 20 mg / L Glucose (glucose), 10 mg / L NH ₄ Cl (ammonium chloride), and 5 mg / L H ₃ PO ₄ were used.

  Then, after sufficiently stirring and confirming that the substrate is dissolved in the town water, sodium hydroxide is added and the pH of the town water in which the substrate is dissolved is adjusted to 8.5, so that the amount of water retained is A test water of 20 L was prepared.

Next, in order to reproduce the flow rate fluctuation in the actual cooling water system, adjustment was made with a valve (not shown) so that the flow rate of the test water flowing in the cooling water supply line 13 was 3.0 L / min. At this time, the temperature control of the test water was not performed, but the temperature of the test water during the test period was in the range of 25-30 ° C.
Further, in order to keep the entire cooling water system in an aerobic state, the test water was bubbled by supplying air to the test water in the circulation water tank 11 at a supply rate of about 1 L / min.
Thereafter, a water passage test for 21 days was performed using the above test conditions.

<Results and discussion of water flow test of Examples>
When the water flow test is started and the sheet-like laser light 31 is irradiated to the test water flowing around the obstacle 27, the green laser light is reflected on the microparticles and microorganisms, and the flow of the test water is visually confirmed. I was able to.
The part where the flow of water around the obstacle 27 is slow after 2 days have passed since the start of water flow (specifically, the front side of the obstacle 27 (of the obstacle 27, the flow of test water On the other hand, it was confirmed that slime was attached to the portion located upstream))). Thereafter, it was confirmed that the amount of slime attached to the obstacle 27 gradually increased.

  Along with this, the spiral flow of test water formed on the front side of the obstacle 27 at the beginning of water flow cannot be confirmed, and the flow of test water changes as the amount of slime increases. It was confirmed by irradiation with the sheet-like laser beam 31.

Then, on the 15th day from the start of water flow, 20 mg / L of chlorinated isothiazolone (Cl-MIT) with respect to the amount of retained water was added to the circulation water tank 11 as a slime remover (antibacterial agent).
As a result, it was confirmed that the slime adhering to the near side of the obstacle was gradually peeled off and the amount of the peeled slime reflected by the sheet-like laser light was increasing.

In addition, as the slime was peeled off, it was confirmed that the flow of test water returned to the front side of the obstacle 27 and returned to the initial flow state.
That is, by using the slime monitoring device 23 shown in FIG. 1, it was confirmed that it was possible to visualize how the slime was peeled from the obstacle 27 by adding the slime remover from the initial state of slime adhesion.

  In the above example, the above test was performed using the laser irradiation unit 29 having a cylindrical lens. However, a test similar to the above example was performed using a laser irradiation unit in which a beam expander and a cylindrical lens were combined. As a result, the same results as in the above example were obtained.

  DESCRIPTION OF SYMBOLS 10 ... Slime remover addition apparatus, 11 ... Circulating water tank, 13 ... Cooling water supply line, 14 ... Pump, 15 ... Cooling water recovery line, 17 ... Slime removing agent tank, 19 ... Slime removing agent supply line, 21 ... Automatic valve, 23 ... slime monitoring device, 24 ... analysis control device, 26 ... flowing water piping, 26a ... inner surface, 26b ... surface, 27 ... obstruction, 29 ... laser irradiation part, 31 ... sheet-shaped laser beam, 33 ... imaging part 34 ... analyzing unit 36 ... display unit 38 ... control unit

Claims (13)

Transparent and water-flow piping that can transmit laser light,
An obstacle arranged in the flowing water pipe and changing the flow of water flowing in the flowing water pipe;
A laser irradiation unit that irradiates the water flowing around the obstacle with a sheet-like laser beam;
An image capturing unit that continuously images the flow of water around the obstacle irradiated with the sheet-like laser light, and acquires image data;
By analyzing based on the image data, an analysis unit for analyzing the adhesion state of slime adhered in the flowing water pipe,
A slime monitoring device comprising: The obstacle is arranged on the surface located on the bottom side of the flowing water pipe among the inner surfaces of the flowing water pipe,
The laser irradiation unit is arranged to face the obstacle above the flowing water pipe,
The slime monitoring apparatus according to claim 1, wherein the imaging unit is disposed at a position where the flow of water can be imaged from a side surface of the flowing water pipe intersecting with the sheet-like laser light.   The slime monitoring apparatus according to claim 1 or 2, wherein the sheet-like laser light is green laser light.   The slime monitoring device according to any one of claims 1 to 3, further comprising a display unit that displays the image data and a result analyzed by the analysis unit.   The slime monitoring device according to any one of claims 1 to 4, wherein the imaging unit is a high-speed camera. The slime monitoring device according to any one of claims 1 to 5,
In accordance with the result of the analysis based on the image data, a control unit that controls whether or not to add a slime remover into the water tank that supplies the water to the flowing water pipe,
An apparatus for adding a slime remover. Irradiating the sheet-shaped laser light to the water flowing around the obstacle disposed in the flowing water pipe transparent and capable of transmitting the laser light;
Continuously capturing the flow of water around the obstacle irradiated with the sheet-like laser light, and acquiring image data;
By analyzing based on the image data, analyzing the adhesion state of the slime adhered in the flowing water pipe,
A slime monitoring method characterized by comprising: As the sheet-like laser light, green laser light is used,
8. The slime monitoring method according to claim 7, further comprising a step of displaying the image data and a result of analysis by the analysis unit on a display unit in real time.   9. The slime monitoring method according to claim 7, wherein data captured by a high-speed camera is used as the image data. Irradiating the sheet-shaped laser light to the water flowing around the obstacle disposed in the flowing water pipe transparent and capable of transmitting the laser light;
Continuously capturing the flow of water around the obstacle irradiated with the sheet-like laser light, and acquiring image data;
By analyzing based on the image data, analyzing the adhesion state of the slime adhered in the flowing water pipe,
When it is determined from the result of analysis based on the image data that it is necessary to add a slime remover into the water tank that supplies the water to the running water pipe, the slime remover is added to the water tank. And a process of
A method for adding a slime remover. As the sheet-like laser light, green laser light is used,
11. The slime removing agent adding method according to claim 10, further comprising a step of displaying the image data and the result of analysis by the analysis unit on a display unit in real time.   The slime remover addition method according to claim 10 or 11, wherein data captured by a high-speed camera is used as the image data.   13. The method according to claim 10, wherein in the step of adding the slime removing agent, the slime removing agent is added in an amount corresponding to the amount of the slime attached to the water tank. How to add slime remover.

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