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WO2018135130A1 - Dispositif de mesure de siccité et procédé de mesure de siccité - Google Patents

Dispositif de mesure de siccité et procédé de mesure de siccité Download PDF

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Publication number
WO2018135130A1
WO2018135130A1 PCT/JP2017/042054 JP2017042054W WO2018135130A1 WO 2018135130 A1 WO2018135130 A1 WO 2018135130A1 JP 2017042054 W JP2017042054 W JP 2017042054W WO 2018135130 A1 WO2018135130 A1 WO 2018135130A1
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WIPO (PCT)
Prior art keywords
light
absorbance
inspection
wet steam
dryness
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Ceased
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PCT/JP2017/042054
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English (en)
Japanese (ja)
Inventor
泰明 松儀
康博 五所尾
志功 田邉
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Azbil Corp
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Azbil Corp
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Publication of WO2018135130A1 publication Critical patent/WO2018135130A1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N25/00—Investigating or analyzing materials by the use of thermal means
    • G01N25/56—Investigating or analyzing materials by the use of thermal means by investigating moisture content
    • G01N25/58—Investigating or analyzing materials by the use of thermal means by investigating moisture content by measuring changes of properties of the material due to heat, cold or expansion
    • G01N25/60—Investigating or analyzing materials by the use of thermal means by investigating moisture content by measuring changes of properties of the material due to heat, cold or expansion for determining the wetness of steam

Definitions

  • the present invention relates to a measurement technique, and relates to a dryness measuring apparatus and a dryness measuring method.
  • dryness is also defined as the ratio of the difference between the specific enthalpy of wet steam and the specific enthalpy of saturated liquid to the specific enthalpy of latent heat.
  • the dryness is 0.5.
  • the dryness is 1.0.
  • the wet steam dryness is controlled. It is desired to be in a state close to 1.0. Therefore, various methods for measuring the dryness have been proposed.
  • Patent Document 1 uses a saturated steam table based on the wet steam flow rate and pressure before and after the pressure control valve, using the fact that there is no change in the total enthalpy before and after the pressure control valve provided in the pipe.
  • a technique for calculating dryness by obtaining saturated water enthalpy and saturated steam enthalpy is disclosed.
  • Patent Document 1 needs to change the wet vapor of the measurement object from the two-phase state to the gas phase state and further stabilize the measurement object in the gas phase state, measurement of dryness There is a problem that it takes time.
  • Patent Document 2 discloses a technique for optically measuring the dryness.
  • Patent Document 3 discloses a technique for measuring dryness using two lights having different wavelengths.
  • JP-A-8-312908 Japanese Unexamined Patent Publication No. 2016-57203 Japanese Unexamined Patent Publication No. 2016-85059
  • an object of the present invention is to provide a dryness measuring apparatus and a dryness measuring method capable of accurately measuring the dryness.
  • the inspection light emitting unit that emits inspection light having at least a wavelength that is absorbed by the saturated liquid, and the first and second reference lights that are less likely to be absorbed by the saturated liquid than the inspection light are emitted.
  • a reference light emitting unit an inspection tube for flowing wet steam therein, an inspection tube through which the inspection light and the first and second reference light pass, an inspection light that has passed through the inside of the inspection tube, and the first and second Based on the light receiving unit that receives the reference light, the inspection light received by the light receiving unit, and the first and second reference light, the absorbance of the wet steam by each of the inspection light and the first and second reference light is calculated.
  • a dryness specifying section for specifying the dryness of the Measuring device is provided.
  • the inspection tube may include a window through which the inspection light and the first and second reference lights pass.
  • the correction value of the absorbance of the wet steam by the inspection light is determined so that the inspection light and the second reference light have a wavelength difference between the first reference light and the second reference light from the absorbance of the wet steam by the inspection light.
  • a value obtained by multiplying the first coefficient which is the ratio of the wavelength difference of the reference light by the absorbance of the wet steam by the first reference light, and a second coefficient corresponding to a value obtained by subtracting the first coefficient from 1 It may correspond to a value obtained by subtracting the value obtained by multiplying the absorbance of the wet steam by the reference light of 2.
  • the equivalent includes the same thing.
  • the calculation order is not limited.
  • the dryness measuring apparatus may further include a data storage device that stores a second coefficient corresponding to a value obtained by subtracting the first coefficient from 1.
  • the correction value of the absorbance of the wet steam by the inspection light includes saturated water flowing through the inside of the inspection tube by the first reference light and the second reference light from the absorbance of the wet steam by the inspection light.
  • the first coefficient which is the ratio of the difference in absorbance of the gas that does not contain saturated water flowing through the inside of the test tube due to the test light and the second reference light, to the difference in absorbance of the gas that is not present, is the wet steam by the first reference light. Even if it corresponds to a value obtained by subtracting the value obtained by multiplying the absorbance by the second coefficient corresponding to the value obtained by subtracting the first coefficient from 1 and the value obtained by multiplying the absorbance of the wet vapor by the second reference light. Good.
  • the equivalent includes the same thing.
  • the calculation order is not limited.
  • the dryness measuring device described above is configured so that the inside of the inspection tube by the inspection light and the second reference light with respect to the difference in absorbance of the gas not containing saturated water flowing through the inside of the inspection tube by the first reference light and the second reference light You may further provide the data storage device which preserve
  • the dryness measuring apparatus may further include a data storage device that stores a second coefficient corresponding to a value obtained by subtracting the first coefficient from 1.
  • the inspection light having at least a wavelength that is absorbed by the saturated liquid is emitted to the wet steam, and the first and second reference lights that are less likely to be absorbed by the saturated liquid than the inspection light.
  • a method of measuring dryness is provided, including identifying the dryness of the wet steam based on a correction value of the absorbance of the wet steam by light.
  • wet steam may flow inside the inspection tube, and the inspection tube may include a window through which the inspection light and the first and second reference lights pass.
  • the correction value of the absorbance of the wet vapor by the inspection light is determined so that the inspection light and the first reference light with respect to the wavelength difference between the first reference light and the second reference light are determined from the absorbance of the wet vapor by the inspection light.
  • a value obtained by multiplying the first coefficient which is the ratio of the wavelength difference of the two reference lights by the absorbance of the wet steam by the first reference light, and a second coefficient corresponding to a value obtained by subtracting the first coefficient from 1 It may correspond to a value obtained by subtracting the value obtained by multiplying the absorbance of the wet steam by the second reference light.
  • the equivalent includes the same thing.
  • the calculation order is not limited.
  • the correction value of the wet steam absorbance due to the inspection light is the saturated water flowing in the test tube due to the first reference light and the second reference light based on the wet steam absorbance due to the inspection light.
  • the first coefficient which is the ratio of the difference in absorbance of the gas not containing saturated water flowing through the inside of the test tube by the test light and the second reference light to the difference in absorbance of the gas not containing the wet steam by the first reference light
  • the equivalent includes the same thing.
  • the calculation order is not limited.
  • the dryness measuring apparatus absorbs the inspection light emitting unit 11 that emits inspection light having at least a wavelength absorbed by the saturated liquid, and the saturated liquid as compared with the inspection light.
  • a reference light emitting unit 113 that emits first and second reference light that is difficult to be generated, and a test tube 21 that allows wet steam to flow therein, and a test tube 21 through which the test light and the first and second reference light pass.
  • a light receiving unit 12 that receives the inspection light passing through the inside of the inspection tube 21 and the first and second reference lights.
  • the dryness measuring device further calculates the absorbance of the wet vapor by each of the inspection light and the first and second reference lights based on the inspection light and the first and second reference lights received by the light receiving unit 12. Based on the absorbance calculation unit 301, the correction unit 302 that corrects the absorbance of the wet vapor by the first and second reference lights with the absorbance of the wet vapor by the inspection light, and the correction value of the absorbance of the wet vapor by the inspection light A dryness specifying unit 303 for specifying the dryness of the steam.
  • the absorbance calculation unit 301, the correction unit 302, and the dryness specification unit 303 are included in, for example, a central processing unit (CPU) 300.
  • the test tube 21 can pass wet steam in which saturated steam and saturated liquid are combined.
  • saturated steam under standard atmospheric pressure, water reaches a boiling point (100 ° C.), and then water as droplets and steam are mixed to form wet steam in a coexisting state.
  • the pressure is constant, since the latent heat of wet steam changes due to heating and cooling, the saturation temperature is constant.
  • dryness the mass ratio of saturated steam to the total amount of wet steam. Therefore, the dryness of the saturated steam is 1, and the dryness of the saturated liquid is 0.
  • z m vapor / (m vapor + m water ) (1) z represents the degree of dryness, m vapor represents the mass of saturated vapor, and m water represents the mass of saturated liquid.
  • the mass of the saturated vapor is proportional to the absorbance of the saturated vapor.
  • the mass of the saturated liquid is proportional to the absorbance of the saturated liquid. Therefore, the following equation (2) is derived from the above equation (1).
  • a vapor represents the absorbance of the saturated vapor
  • a water represents the absorbance of the saturated liquid
  • k represents the molar extinction coefficient ratio given by the following equation (3).
  • k e vapor / e water (3)
  • e vapor represents the extinction coefficient of saturated vapor
  • e water represents the extinction coefficient of saturated liquid.
  • the absorption spectra of the saturated vapor and the saturated liquid are different.
  • the absorption spectrum of the saturated liquid changes. For example, as the dryness changes from 0 to 1, the content of the saturated liquid in the wet steam decreases, so the absorbance As of the wet steam at the peak wavelength of the absorption spectrum of the saturated liquid also decreases as shown in FIG. To do.
  • the wavelength at the peak of the absorption spectrum of the saturated liquid is around 1880 nm.
  • the absorbance of saturated steam can be regarded as constant if the pressure is constant.
  • the dryness of the wet steam is also given by the following equation (6) derived from the above equations (2), (4), and (5).
  • z 1 / (1-k + (k / a vapor ) ⁇ A S ) (6)
  • the molar extinction coefficient ratio k is a constant.
  • the absorbance a Vapor saturated steam can be considered a constant under constant pressure
  • the absorbance a Vapor saturated steam can be derived from the pressure of the wet steam. Therefore, by measuring the absorbance A S of wet steam, it is possible to calculate the dryness fraction z of wet steam from (6).
  • the inspection light emitting unit 11 shown in FIG. 1 emits inspection light including a wavelength band that is absorbed by the saturated liquid.
  • the inspection light is, for example, near infrared light having a wavelength region of 800 nm to 2500 nm.
  • the wavelength band of the inspection light and the wavelength bands of the first and second reference lights may partially overlap.
  • the inspection light may have the peak wavelength of the absorption spectrum of the saturated liquid as the center wavelength. In the wavelength region, the absorption spectra of the saturated vapor and the saturated liquid overlap.
  • a light emitting diode or the like can be used for the inspection light emitting unit 11 shown in FIG.
  • the first and second reference lights emitted from the reference light emitting unit 113 have different wavelengths.
  • the wavelength of the second reference light is longer than the wavelength of the first reference light.
  • the wavelength of the inspection light may be between the first and second reference lights.
  • the wavelengths of the first and second reference lights may be longer than the wavelength of the inspection light.
  • the wavelengths of the first and second reference lights may be shorter than the wavelength of the inspection light.
  • each of the first and second reference lights has a wavelength that is difficult to be absorbed by wet steam in the entire range of dryness.
  • the wavelength band that is difficult to be absorbed by the wet steam is, for example, less than 1300 nm and near 1600 nm to 1800 nm.
  • the reference light emitting unit 113 illustrated in FIG. 1 may include a first reference light emitting unit 111 that emits first reference light and a second reference light emitting unit 112 that emits second reference light. Good.
  • a light emitting diode or the like can be used for the first reference light emitting unit 111 and the second reference light emitting unit 112, a light emitting diode or the like can be used.
  • the inspection optical waveguide 30 for propagating the inspection light is arranged facing the inspection light emitting unit 11.
  • a first reference optical waveguide 130 that propagates the first reference light is disposed facing the first reference light emitting unit 111.
  • a second reference optical waveguide 230 that propagates the second reference light is disposed facing the second reference light emitting unit 112.
  • the multiplexer 14 is connected to the inspection optical waveguide 30, the first reference optical waveguide 130, and the second reference optical waveguide 230.
  • a multiplexer optical waveguide 31 for propagating the inspection light combined with the multiplexer 14 and the first and second reference lights into the inspection tube 21 is connected to the multiplexer 14.
  • light-transmitting windows 121A and 121B are provided on the side wall of the test tube 21.
  • the window 121A provided in the inspection tube 21 and the window 121B are opposed to each other.
  • the windows 121A and 121B are made of heat resistant glass such as quartz glass or sapphire glass.
  • the heat resistant test tube 21 provided with the windows 121A and 121B is, for example, a sight glass.
  • the multiplexed optical waveguide 31 is connected to the outer surface of a window 121A provided in the test tube 21, for example.
  • a collimator lens may be disposed between the end of the multiplexed optical waveguide 31 and the outer surface of the window 121A.
  • the inspection light emitted from the end of the combined optical waveguide 31 is absorbed by the saturated liquid contained in the wet steam inside the inspection tube 21.
  • the saturated liquid contained in the wet steam decreases as the dryness approaches from 0 to 1. Therefore, as the dryness of the wet steam in the test tube 21 approaches 0 to 1, the absorbance of the wet steam with respect to the test light tends to decrease.
  • the inspection light emitted from the end portion of the combined optical waveguide 31 and a part of the first and second reference lights are reflected, scattered, and refracted by the laminar flow or wave flow of the saturated liquid inside the inspection tube 21. Can be equal. Therefore, the inspection light and the first and second reference lights can be attenuated by reflection, scattering, refraction, and the like.
  • the windows 121A and 121B may be deteriorated or dirty.
  • Examples of deterioration of the windows 121A and 121B include white discoloration, blue discoloration, and latent scratches.
  • contamination adhering to window 121A, 121B the rust which scattered inside the test tube 21 is mentioned. Deterioration and contamination of the windows 121A and 121B may worsen over time.
  • the inspection light emitted from the end portion of the multiplexed optical waveguide 31 and the first and second reference lights can be attenuated due to deterioration or contamination of the windows 121A and 121B.
  • the light attenuation due to deterioration and dirt of the windows 121A and 121B depends on the wavelength of light, and the light attenuation due to deterioration and dirt of the windows 121A and 121B and the light.
  • the wavelength of is generally in a linear relationship.
  • the wavelength of the second reference light is longer than the wavelength of the first reference light, for example, the attenuation of the first reference light due to deterioration or contamination of the windows 121A and 121B is the first attenuation due to deterioration or contamination of the windows 121A and 121B. 2 is greater than the attenuation of the reference light.
  • the light receiving waveguide 51 into which the inspection light passing through the inside of the inspection tube 21 and the first and second reference lights enter is connected to the outer surface of the window 121B of the inspection tube 21.
  • the end of the light receiving waveguide 51 is opposed to the end of the combined optical waveguide 31.
  • a lens that allows the inspection light and the first and second reference lights to enter the light receiving waveguide 51 may be disposed between the outer surface of the window 121B and the end of the light receiving waveguide 51.
  • the light receiving waveguide 51 guides the inspection light transmitted through the inside of the inspection tube 21 and the first and second reference lights to the light receiving unit 12.
  • a light intensity detection element such as a photodiode can be used for the light receiving unit 12.
  • the inspection optical waveguide 30, the first reference optical waveguide 130, the second reference optical waveguide 230, the combined optical waveguide 31, and the light receiving waveguide 51 include polymethyl methacrylate resin (PMMA: Poly (methymethacrylate)).
  • PMMA Poly (methymethacrylate)
  • a single core optical fiber made of plastic such as glass and a single core optical fiber made of glass such as quartz glass can be used. However, if the inspection light and the first and second reference lights can be propagated, these can be used. It is not limited to.
  • the dryness measuring apparatus may further include a pressure sensor 16 that measures the pressure of the wet steam in the test tube 21.
  • the pressure information may be obtained from upstream or downstream of the inspection tube 21.
  • the light receiving unit 12 and the pressure sensor 16 are connected to the CPU 300.
  • a data storage device 400 is connected to the CPU 300.
  • the data storage device 400 stores a relational expression between the absorbance of the wet steam and the dryness of the wet steam as in the above formula (6).
  • the absorbance calculation unit 301 included in the CPU 300 receives from the light receiving unit 12 the measurement values of the inspection light transmitted through the wet steam inside the inspection tube 21 and the light intensity of the first and second reference lights.
  • the absorbance calculation unit 301 specifies the absorbance A Lx of the wet vapor in the test tube 21 by the test light based on the light intensity of the test light received by the light receiving unit 12.
  • the light intensity of the inspection light before passing through the wet steam or when there is no wet steam in the inspection tube 21 may be a value measured in advance as a constant.
  • the absorbance calculation unit 301 specifies the absorbance A L1 of the wet steam in the test tube 21 by the first reference light based on the light intensity of the first reference light received by the light receiving unit 12. Further, the absorbance calculation unit 301 specifies the absorbance A L2 of the wet steam in the test tube 21 by the second reference light based on the light intensity of the second reference light received by the light receiving unit 12.
  • the measurement value of the wet steam absorbance A Lx by the inspection light is affected by the deterioration At tx of the inspection light due to the deterioration of the windows 121A and 121B and dirt. Therefore, the corrected absorbance AbLx of the wet vapor due to the inspection light, excluding the influence of the attenuation degree AtLx of the inspection light due to the deterioration or dirt of the windows 121A and 121B, is given by the following equation (7).
  • a bLx A Lx -A tLx (7)
  • the measured value of the wet steam absorbance A L1 by the first reference light is substantially the attenuation of the first reference light due to deterioration or contamination of the windows 121A and 121B, as shown in the following equation (8). It can be regarded as the degree A tL1 .
  • a L1 A tL1 (8)
  • the second reference light also has a wavelength that is difficult to be absorbed by water. Therefore, the measured value of the wet steam absorbance A L2 by the second reference light is substantially the attenuation of the second reference light due to deterioration or contamination of the windows 121A and 121B, as shown in the following equation (9). It can be regarded as the degree AtL2 .
  • a L2 A tL2 (9)
  • the inspection light attenuation At Lx due to the deterioration and dirt of the windows 121A and 121B Is expressed using a predetermined coefficient m k and the first and second reference light attenuations A tL1 and A tL2 due to deterioration and contamination of the windows 121A and 121B, as shown in the following equation (10). be able to.
  • a tLx m k A tL1 + (1-m k ) A tL2 (10) From the above equations (7) to (10), the corrected absorbance AbLx of the wet steam by the inspection light is given by the following equation (11).
  • a bLx A Lx - [m k A L1 + (1-m k) A L2] (11)
  • the correction unit 302 illustrated in FIG. 1 calculates the corrected absorbance AbLx of the wet steam by the inspection light using, for example, the above equation (11).
  • the corrected absorbance A bLx of the wet vapor by the inspection light is an inspection with respect to the wavelength difference (L1 ⁇ L2) between the first reference light and the second reference light from the measured value A Lx of the wet vapor absorbance by the inspection light.
  • a value m k A L1 obtained by multiplying the measurement value A L1 of the absorbance of the wet vapor by the first reference light by the first coefficient m k which is the ratio of the wavelength difference (Lx ⁇ L2) between the light and the second reference light.
  • a value obtained by multiplying the measured value A L2 of the wet steam absorbance by the second reference light by a second coefficient (1-m k ) corresponding to a value obtained by subtracting the first coefficient m k from 1 (1-m k ) corresponds to a value obtained by subtracting A L2 .
  • the coefficient m k may be a constant calculated in advance. At least one of the first coefficient m k and the second coefficient (1 ⁇ m k ) may be stored in the data storage device 400.
  • the dryness specifying unit 303 receives the corrected absorbance AbLx of wet steam from the correcting unit 302. Further, the dryness specifying unit 303 receives the measured value of the pressure of the wet steam in the test tube 21 from the pressure sensor 16.
  • the dryness specifying unit 303 calculates the absorbance a vapor of saturated vapor depending on the pressure. Furthermore, the dryness of the identifying unit 303, for example, the (6) assigns the value of absorbance A BLX of the corrected wet steam in the expression of the variable A s, the value of absorbance a Vapor saturated steam calculated in the variable a Vapor By substituting, the dryness z of the wet steam in the inspection tube 21 is calculated.
  • the pressure is constant, the absorbance a vapor of the saturated vapor can be regarded as constant. Therefore, if the pressure in the test tube 21 is constant, a constant may be used for the absorbance a vapor of the saturated vapor. In this case, the dryness measuring apparatus according to the first embodiment may not include the pressure sensor 16.
  • an input device 321, an output device 322, a program storage device 323, and a temporary storage device 324 are connected to the CPU 300.
  • a switch, a keyboard, and the like can be used.
  • the relational expression stored in the data storage device 400 is input using the input device 321, for example.
  • an optical indicator, a digital indicator, a liquid crystal display device, or the like can be used.
  • the output device 322 outputs, for example, the dryness value of the wet steam inside the test tube 21 specified by the dryness specifying unit 303.
  • the program storage device 323 stores a program for causing the CPU 300 to execute data transmission / reception between devices connected to the CPU 300.
  • the temporary storage device 324 temporarily stores data in the calculation process of the CPU 300.
  • the dryness measuring apparatus it is possible to accurately measure the dryness of the wet steam even if the light is attenuated by factors other than the light absorption by the wet steam.
  • the measured value of the gas absorbance A Lx-0 by the inspection light is substantially as shown in the following equation (13). It can be regarded as the attenuation degree AtLx of the inspection light due to deterioration or dirt of the windows 121A and 121B.
  • the gas which does not contain saturated water is air
  • a Lx-0 A tLx (13)
  • the measured value of the gas absorbance A L1-0 by the first reference light is substantially the deterioration or dirt of the windows 121A and 121B. Can be regarded as the attenuation degree A tL1 of the first reference light.
  • the measured value of the gas absorbance A L2-0 by the second reference light can be substantially regarded as the second reference light attenuation At L2 due to deterioration or contamination of the windows 121A and 121B. It is.
  • the relationship between the measured values A Lx-0 , A L1-0 , A L2-0 of the absorbance and the wavelengths Lx, L1, L2 is as shown in FIG.
  • the coefficient m k given by is also given by the following equation (14).
  • m k (A LX-0 -A L2-0 ) / (A L1-0 -A L2-0 ) (14) Therefore, the correction unit 302 shown in FIG. 1 uses measured values A Lx-0 , A L1-0 , A L2-0 obtained in advance by flowing a gas not containing saturated water into the test tube 21.
  • the corrected absorbance AbLx of the wet steam by the inspection light may be calculated by the above equation (11) using the coefficient m k calculated in the above. At least one of the first coefficient m k and the second coefficient (1 ⁇ m k ) may be stored in the data storage device 400.
  • the corrected absorbance AbLx of the wet steam by the inspection light is obtained by calculating the saturated water by the first reference light and the second reference light from the measured value A Lx of the wet steam absorbance by the inspection light.
  • a L1 obtained by multiplying the measured value A L1 of the wet steam absorbance by the first reference light by the first coefficient m k , which is the ratio of 1, and a value obtained by subtracting the first coefficient m k from 1
  • This value is equivalent to a value obtained by subtracting (1 ⁇ m k ) A L2 obtained by multiplying the second coefficient (1 ⁇ m k ) by the measured value A L2 of the wet steam absorbance by the second reference light.
  • the wavelengths of the inspection light and the first and second reference lights are not single and may have a predetermined bandwidth.
  • it is based on the absorbance of the gas not containing saturated water.
  • Example 1 In the case where there are no white burns in the windows 121A and 121B of the inspection tube 21 shown in FIG. 1, the air was passed through the inspection tube 21, and the received light intensity of the inspection light and the first and second reference light was measured. Next, in each of a state in which wet steam is passed through the inspection tube 21 to strongly cool the inspection tube 21, a state in which the inspection tube 21 is lightly cooled, a state in which the inspection tube 21 is at room temperature, and a state in which the inspection tube 21 is heated. The received light intensity of the inspection light and the first and second reference lights was measured.
  • the atmosphere was passed through the inspection tube 21, and the received light intensity of the inspection light and the first and second reference light was measured.
  • a state in which wet steam is passed through the inspection tube 21 to strongly cool the inspection tube 21 a state in which the inspection tube 21 is lightly cooled, a state in which the inspection tube 21 is at room temperature, and a state in which the inspection tube 21 is heated.
  • the received light intensity of the inspection light and the first and second reference lights was measured.
  • FIG. 8 is a graph plotting the received light intensity of the inspection light and the first and second reference lights.
  • Example 2 Using the dryness measuring apparatus including the correction unit described in the second embodiment, the dryness is measured when there are no white burns and when there are white burns in the windows 121A and 121B of the test tube 21 shown in FIG. did. As a result, as shown in FIG. 9, even when the windows 121A and 121B had white discoloration, the dryness was almost the same as when there was no white discoloration.
  • a value obtained by subtracting the absorbance of the wet vapor due to the first reference light from the absorbance of the wet vapor due to the inspection light is used as a correction value for the absorbance of the wet vapor due to the inspection light.
  • the dryness which concerns on a comparative example was measured. As a result, as shown in FIG. 9, it was confirmed that when the window 121 ⁇ / b> A, 121 ⁇ / b> B has white discoloration, an error occurs when the dryness increases.
  • the reflecting plate 131 is disposed on the side wall inside the test tube 21 facing the end of the combined optical waveguide 31 and the end of the light receiving waveguide 51.
  • the inspection light and the first and second reference light emitted from the end of the combined optical waveguide 31 travel through the inspection tube 21, are reflected by the reflection plate 131, and enter the light receiving waveguide 51.
  • angles of the inspection light and the first and second reference light emitted from the end portion of the combined optical waveguide 31 are determined by the light transmitting window 121 provided in the inspection tube 21 and the first and first light beams. 2 below the critical angle at which the reference light is totally reflected, and below the critical angle at which the inspection light and the first and second reference light are totally reflected at the surface of the laminar flow or the wavy flow of the saturated liquid inside the inspection tube 21
  • the critical angle at which the reference light is totally reflected below the critical angle at which the inspection light is totally reflected, and below the critical angle at which the inspection light and the first and second reference light are totally reflected at the surface of the laminar flow or the wavy flow of the saturated liquid inside the inspection tube 21
  • the dryness measuring device is a visualization of the latent heat increase effect by the pressure reducing valve, dryness measurement to obtain the optimum boiler efficiency, wet loss measurement of the steam turbine, optimal dryness control of the heat exchanger, It can be used for the control of food production processes such as a noodle-making process and the control of chemical processes.

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  • Biochemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
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Abstract

L'invention concerne un dispositif de mesure de siccité qui comprend : une unité d'émission de lumière d'inspection 11 pour émettre de la lumière d'inspection ayant une longueur d'onde qui est absorbée par un liquide saturé; une unité d'émission de lumière de référence 113 pour émettre des première et seconde lumières de référence qui ne sont pas facilement absorbées par le liquide saturé par rapport à la lumière d'inspection; un tube d'inspection 21 pour faire circuler de la vapeur humide à travers l'intérieur de celui-ci, la lumière d'inspection et les première et seconde lumières de référence passant à travers le tube d'inspection 21; une unité de réception de lumière 12 pour recevoir la lumière d'inspection et les première et seconde lumières de référence passées à travers le tube d'inspection 21; une unité de calcul d'absorbance 301 pour calculer l'absorbance de la vapeur humide par rapport à la lumière d'inspection et les première et seconde lumières de référence sur la base de la lumière d'inspection et des première et seconde lumières de référence reçues par l'unité de réception de lumière 12; une unité de correction 302 pour corriger l'absorbance de la vapeur humide par rapport à la lumière d'inspection à l'aide de l'absorbance de la vapeur humide par rapport aux première et seconde lumières de référence; et une unité de spécification de siccité 303 destinée à spécifier la siccité de la vapeur humide sur la base de la valeur corrigée de l'absorbance de la vapeur humide par rapport à la lumière d'inspection.
PCT/JP2017/042054 2017-01-23 2017-11-22 Dispositif de mesure de siccité et procédé de mesure de siccité Ceased WO2018135130A1 (fr)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119198610A (zh) * 2024-12-02 2024-12-27 杭州泽天春来科技股份有限公司 自动校零式傅里叶红外气体分析仪及其分析方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56110037A (en) * 1980-01-23 1981-09-01 Commissariat Energie Atomique Measuring device for luminous intensity
JP2004279339A (ja) * 2003-03-18 2004-10-07 Kurabo Ind Ltd 濃度測定装置
US7034302B2 (en) * 2002-09-19 2006-04-25 Battelle Energy Alliance, Llc Optical steam quality measurement system and method
JP2016151572A (ja) * 2015-02-19 2016-08-22 アズビル株式会社 乾き度測定装置

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56110037A (en) * 1980-01-23 1981-09-01 Commissariat Energie Atomique Measuring device for luminous intensity
US7034302B2 (en) * 2002-09-19 2006-04-25 Battelle Energy Alliance, Llc Optical steam quality measurement system and method
JP2004279339A (ja) * 2003-03-18 2004-10-07 Kurabo Ind Ltd 濃度測定装置
JP2016151572A (ja) * 2015-02-19 2016-08-22 アズビル株式会社 乾き度測定装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN119198610A (zh) * 2024-12-02 2024-12-27 杭州泽天春来科技股份有限公司 自动校零式傅里叶红外气体分析仪及其分析方法

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