WO2016174759A1 - Analyseur de gaz de type laser - Google Patents

Analyseur de gaz de type laser Download PDF

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Publication number
WO2016174759A1
WO2016174759A1 PCT/JP2015/062948 JP2015062948W WO2016174759A1 WO 2016174759 A1 WO2016174759 A1 WO 2016174759A1 JP 2015062948 W JP2015062948 W JP 2015062948W WO 2016174759 A1 WO2016174759 A1 WO 2016174759A1
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WIPO (PCT)
Prior art keywords
gas
cell
analysis target
gas cell
unit
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PCT/JP2015/062948
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English (en)
Japanese (ja)
Inventor
雅哉 田原
亮一 東
和裕 小泉
貴誌 乾
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富士電機株式会社
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Priority to PCT/JP2015/062948 priority Critical patent/WO2016174759A1/fr
Publication of WO2016174759A1 publication Critical patent/WO2016174759A1/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
    • G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

Definitions

  • the present invention relates to a laser gas analyzer that measures the gas concentration of a measurement target gas contained in an analysis target gas such as exhaust gas.
  • Patent Document 1 Japanese Patent Laid-Open No. 2009-47677.
  • This conventional laser gas analyzer performs, for example, gas analysis of exhaust gas passing through the inside of a flue.
  • Two flanges are fixed at opposite positions on the wall of the flue pipe.
  • the light emitting part and the light receiving part are respectively fixed to the flanges.
  • the light emitting unit emits laser light into the flue, and the light receiving unit receives the laser light absorbed by the measurement target gas in the exhaust gas in the flue.
  • concentration of the measuring object gas in exhaust gas is measured based on the intensity
  • the laser gas analyzer needs to secure a flue diameter (optical path length) of 0.5 m or more as a product installation specification.
  • the diameter of the ship's flue is, for example, about 0.2 m in the case of the exhaust gas flue of a diesel engine for power generation. If a prior art laser gas analyzer is directly adopted for a small-diameter flue, the optical path length is There was a problem of being short. In a laser gas analyzer, if the optical path length is short, it is difficult to accurately measure a low-concentration gas for reasons described later. It is necessary to measure particularly low-concentration gas due to the strict emission regulations of harmful substances, but it is difficult to accurately analyze low-concentration gas depending on the size of the flue diameter.
  • the present invention has been made to solve the above-described problems, and the object thereof is to adopt a structure in which the optical axis is unlikely to be easily installed, and to be measured in an analysis target gas.
  • An object of the present invention is to provide a laser type gas analyzer that accurately analyzes the gas concentration of a gas over a long period of time.
  • the first invention is A gas introduction part having an opening disposed in a flow path through which the analysis target gas flows, and introducing the analysis target gas in the flow path through the opening;
  • a cylindrical gas cell that communicates with the gas introduction unit and into which an analysis target gas is introduced into an internal measurement space;
  • a gas deriving unit communicating with the gas cell and deriving an analysis target gas from the measurement space of the gas cell;
  • a light emitting unit that is arranged and fixed on one end side of the gas cell, and irradiates the analysis target gas in the measurement space of the gas cell with a laser beam;
  • a light receiving unit that is arranged and fixed on the other end side of the gas cell, receives a laser beam that has passed through the gas to be analyzed, and outputs a detection signal; It was set as the laser type gas analyzer provided with.
  • a gas introduction part having an opening disposed in a flow path through which the analysis target gas flows, and introducing the analysis target gas in the flow path through the opening;
  • a cylindrical gas cell that communicates with the gas introduction unit and into which an analysis target gas is introduced into an internal measurement space;
  • a plurality of gas deriving portions communicating with the gas cell and deriving an analysis target gas from the measurement space of the gas cell;
  • a light emitting unit that is arranged and fixed on one end side of the gas cell, and irradiates the analysis target gas in the measurement space of the gas cell with a laser beam;
  • a light receiving unit that is arranged and fixed on the other end side of the gas cell, receives a laser beam that has passed through the gas to be analyzed, and outputs a detection signal;
  • the plurality of gas outlets communicate with the gas cell such that a part thereof is located between the light emitting part and the gas introducing part, and the rest is located between the gas introducing part and the light receiving part.
  • a gas introduction part having an opening disposed in a flow path through which the analysis target gas flows, and introducing the analysis target gas in the flow path through the opening;
  • a cylindrical gas cell that communicates with the gas introduction unit and into which an analysis target gas is introduced into an internal measurement space;
  • a plurality of gas deriving portions communicating with the gas cell and deriving an analysis target gas from the measurement space of the gas cell;
  • a plurality of purge gas introduction portions that communicate with the gas cell and introduce purge gas into the measurement space of the gas cell;
  • a light emitting unit that is arranged and fixed on one end side of the gas cell, and irradiates the analysis target gas in the measurement space of the gas cell with a laser beam;
  • a light receiving unit that is arranged and fixed on the other end side of the gas cell, receives a laser beam that has passed through the gas to be analyzed, and outputs a detection signal;
  • the plurality of gas outlets communicate with the gas cell such that a part thereof is located between the light emitting part and the gas
  • the fourth invention is A gas introduction part having an opening disposed in a flow path through which the analysis target gas flows, and introducing the analysis target gas in the flow path through the opening;
  • a cylindrical gas cell that communicates with the gas introduction unit and into which an analysis target gas is introduced into an internal measurement space;
  • a gas deriving unit communicating with the gas cell and deriving an analysis target gas from the measurement space of the gas cell;
  • An introduction side valve for opening and closing the gas introduction part;
  • a lead-out side valve for opening and closing the gas lead-out part;
  • a light emitting unit that is arranged and fixed on one end side of the gas cell, and irradiates the analysis target gas in the measurement space of the gas cell with a laser beam;
  • a light receiving unit that is arranged and fixed on the other end side of the gas cell, receives a laser beam that has passed through the gas to be analyzed, and outputs a detection signal; It was set as the laser type gas analyzer provided with.
  • a gas introduction part having an opening disposed in a flow path through which the analysis target gas flows, and introducing the analysis target gas in the flow path through the opening;
  • a cylindrical gas cell that communicates with the gas introduction unit and into which an analysis target gas is introduced into an internal measurement space;
  • a plurality of gas deriving portions communicating with the gas cell and deriving an analysis target gas from the measurement space of the gas cell;
  • An introduction side valve for opening and closing the gas introduction part;
  • a plurality of outlet side valves that respectively open and close the plurality of gas outlet parts;
  • a light emitting unit that is arranged and fixed on one end side of the gas cell, and irradiates the analysis target gas in the measurement space of the gas cell with a laser beam;
  • a light receiving unit that is arranged and fixed on the other end side of the gas cell, receives a laser beam that has passed through the gas to be analyzed, and outputs a detection signal;
  • the plurality of gas outlets communicate with the gas cell such that a part thereof is located between the light
  • a gas introduction part having an opening disposed in a flow path through which the analysis target gas flows, and introducing the analysis target gas in the flow path through the opening;
  • a cylindrical gas cell that communicates with the gas introduction unit and into which an analysis target gas is introduced into an internal measurement space;
  • a plurality of gas deriving portions communicating with the gas cell and deriving an analysis target gas from the measurement space of the gas cell;
  • a plurality of purge gas introduction portions that communicate with the gas cell and introduce purge gas into the measurement space of the gas cell;
  • An introduction side valve for opening and closing the gas introduction part;
  • a plurality of outlet side valves that respectively open and close the plurality of gas outlet parts;
  • a light emitting unit that is arranged and fixed on one end side of the gas cell, and irradiates the analysis target gas in the measurement space of the gas cell with a laser beam;
  • a light receiving unit that is arranged and fixed on the other end side of the gas cell, receives a laser beam that has passed through the gas to be analyzed, and
  • a laser type gas analyzer that is easy to install and that accurately analyzes the gas concentration of a measurement target gas over a long period of time by adopting a structure in which the optical axis is unlikely to occur. it can.
  • FIG. 1 is a configuration diagram of a laser type gas analyzer 1 of the present embodiment.
  • the thick arrow indicates the electric signal path
  • the thin arrow indicates the flow path of the analysis target gas. This arrow is also illustrated in FIGS. 2 to 6.
  • the laser gas analyzer 1 includes a light emitting unit 10, a gas cell 20, a light receiving unit 30, a duct side gas introducing unit 40, and a duct side gas deriving unit 80.
  • An analysis processing unit 50 is connected to the light receiving unit 30.
  • the analysis processing unit 50 may be disposed around the light receiving unit 30 or may be disposed at a remote location via a communication cable.
  • the gas cell 20 is supported by the duct side gas introduction part 40 and the duct side gas outlet part 80 fixed to the duct 70, and the laser type gas analyzer 1 and the duct 70 are fixed integrally. Has been.
  • This laser type gas analyzer 1 forms the gas introduction part of the present invention by the duct side gas introduction part 40 and the cell side gas introduction part 22, and the cell side gas lead part 23 and the duct side gas lead part 80 of the present invention.
  • a gas outlet is formed.
  • the light emitting unit 10 includes a laser element that emits laser light having a predetermined wavelength.
  • the predetermined wavelength is a wavelength at which the measurement target gas included in the analysis target gas absorbs the laser light.
  • the laser light has a wavelength at which SO gas or SO 2 gas absorbs light.
  • the light emitting unit 10 has a light transmission window, and the analysis target gas does not enter the light emitting unit 10.
  • the gas cell 20 further includes a measurement space 21 and a cell-side gas introduction unit 22.
  • the gas cell 20 is a cylindrical body, and a measurement space 21 is formed therein.
  • the measurement space 21 is a closed space defined by the inner wall of the gas cell 20, the light transmission window of the light emitting unit 10, and the light transmission window of the light receiving unit 30.
  • the inner wall of the gas cell 20 can be, for example, a polished stainless steel inner surface. This prevents adsorption of particulate matter (PM) contained in the analysis target gas as much as possible.
  • a cell-side gas introduction unit 22 communicates, and the analysis target gas is introduced into the measurement space 21 of the gas cell 20 through the cell-side gas introduction unit 22.
  • the light receiving unit 30 includes a light receiving element having sensitivity to the emission wavelength of the laser light emitted from the laser element of the light emitting unit 10.
  • the measurement target gas contained in the analysis target gas absorbs light, and the gas concentration of the measurement target gas included in the analysis target gas at a predetermined ratio. Accordingly, the laser beam having a reduced intensity arrives.
  • the light receiving unit 30 receives the laser light and outputs a detection signal corresponding to the light intensity.
  • the light receiving unit 30 has a light transmission window, and the analysis target gas does not enter the light receiving unit 30.
  • the optical detection system including the gas cell 20, the light emitting unit 10, and the light receiving unit 30 is all disposed outside the duct 70, and has a high degree of freedom in mechanical design. Therefore, a structure in which the light emitting unit 10 and the light receiving unit 30 are mechanically firmly fixed to the highly rigid gas cell 20 can be employed, which is strong against vibration and can hardly cause an optical axis shift due to the vibration. it can. Even if mechanical distortion occurs in the duct 70 due to temperature fluctuations of the analysis target gas or vibration due to wave winds, the optical detection system including the light emitting unit 10, the gas cell 20, and the light receiving unit 30 has the distortion of the duct 70. Since it is not easily affected, optical axis misalignment does not occur.
  • the optical axis can be easily aligned, and high-precision detection is possible. Furthermore, since processing is performed with the gas cell 20 alone, it is easy to increase the mechanical accuracy such as the parallelism of the end face of the gas cell 20, and the optical axis alignment is also easy in this respect.
  • the duct-side gas introduction unit 40 is provided with an opening 41 near the center of the flow path 71 of the duct 70 through which the analysis target gas flows, and introduces the analysis target gas in the flow path 71 into the gas cell 20.
  • the duct side gas introduction part 40 is connected and fixed so as to communicate with the cell side gas introduction part 22. At the connection location, the gas to be analyzed does not leak due to a seal or the like that enhances airtightness.
  • the analysis processing unit 50 inputs a detection signal indicating the output intensity of the laser light from the light receiving unit 30.
  • the analysis processing unit 40 calculates the gas concentration of the measurement target gas in the measurement space 21 of the gas cell 20.
  • the principle of measurement is an absorption method based on the Lambert-Beer law expressed by the following equation (1).
  • P 1 is the output intensity of the laser light that has passed through the measurement target gas flowing in the measurement space 21
  • P 0 is the output intensity of the laser light that does not pass through the measurement target gas
  • ⁇ is the molar extinction coefficient
  • c is The gas concentration, L, represents the optical path length.
  • the molar extinction coefficient ⁇ is uniquely determined by determining the type of gas and the wavelength of the light source, and since the optical path length L is constant, the ratio between the output intensities P 1 and P 0 is an exponential function of the gas concentration c.
  • the output intensities P 1 and P 0 are measured, and the gas concentration is detected by the above equation ( 1).
  • Such a laser gas analyzer 1 detects light absorption by the measurement target gas. That is, compared with the case where there is no light absorption by the measurement target gas, the light intensity of the laser light received by the light receiving unit 30 decreases when there is light absorption, and therefore, the correlation between the light intensity decrease amount and the gas concentration. Use to measure the gas concentration.
  • the gas cell 20 is employed so that the measurement space 21 has a sufficiently long optical path length.
  • the optical path length is affected by the flue diameter.
  • the gas cell 20 is independent of the duct 70, and the shape of the gas cell 20 is arbitrary. Therefore, the gas cell 20 can be lengthened in accordance with the required accuracy, and the required optical path length can be ensured.
  • the light receiving unit 30 performs the calculation, and the calculated concentration is converted into digital data and transmitted to the analysis processing unit 50 at a remote location via a communication cable.
  • the analysis processing unit 50 may perform various types of analysis using the density data.
  • Various forms of the light receiving unit 30 and the analysis processing unit 50 can be employed.
  • the duct 70 is a part of a flue and is formed of a steel pipe or the like, and a flow path 71 is formed therein.
  • the opening 41 of the duct side gas introduction part 40 faces the flow direction of the analysis target gas flowing in the flow channel 71.
  • the analysis target gas introduced through the opening 41 is introduced into the measurement space 21 while suppressing pressure loss. Since the analysis target gas is introduced into the measurement space 21 of the gas cell 20, it is necessary to consider that the gas cell 20 is contaminated with the analysis target gas.
  • the analysis target gas is, for example, gas after purifying exhaust gas from a marine diesel engine through an electric dust collector, an economizer, and a scrubber.
  • Such an analysis target gas includes a very small amount of particulate matter (PM) and a low concentration measurement target gas, but is a relatively clean gas, and even if it stays in the measurement space 21, there is little influence.
  • Such an analysis target gas is irradiated with a laser beam, and the detection light after being absorbed is received to detect the gas concentration based on the principle as described above.
  • the duct side gas introduction unit 40 is fixed to the cell side gas introduction unit 22 in advance, and the duct side gas extraction unit 80 is fixed to the cell side gas extraction unit 23 in advance.
  • the gas outlet 80 is inserted through the hole of the duct 70.
  • the duct-side gas introduction part 40 and the dust-side gas lead-out part 80 are previously attached to the duct 70, and then the cell-side gas introduction part 22 is fixed to the duct-side gas introduction part 40 and the duct-side gas lead-out part
  • the cell side gas outlet 23 may be fixed to 80.
  • the laser gas analyzer 1 described above has the following advantages. (1) In the laser gas analyzer 1 of the present invention, the gas cell 20 is disposed outside the duct 70, and the light emitting unit 10 and the light receiving unit 30 are firmly fixed to both ends of the gas cell 20, thereby allowing wind and rain of the ship.
  • the structure is strong against vibrations caused by waves and waves, and is less likely to cause optical axis misalignment due to the effects of flue vibration including the duct 70. Further, even if the mechanical distortion of the flue including the duct 70 increases due to the vibration, the gas cell 20 arranged outside the duct 70 is not affected by this distortion. This avoids a situation where the optical axis is shifted. These effects reduce the possibility that accurate analysis cannot be performed during voyage due to optical axis misalignment.
  • the gas cell 20 is disposed outside the duct 70, and in addition, the measurement space 21 of the gas cell 20 becomes substantially parallel to the direction in which the flow path 71 of the duct 70 extends. Because of the structure, even with a minimum 0.2m flue on a ship, the design flexibility is high, so the length of the gas cell 20 can be set freely, and the optical path length is sufficient to match the required accuracy. Low concentration gas can be accurately measured as a length. Accurate analysis of low-concentration gas is possible regardless of the size of the flue.
  • the optical axis adjustment largely depends on the structure and mechanical accuracy of the gas cell 20. In other words, the optical axis from the light emitting unit 10 to the light receiving unit 30 is not affected by the work of attaching the gas cell 20 to the duct 70. Therefore, the laser gas analyzer 1 can be easily attached to the duct 70.
  • the laser gas analyzer 2 includes a light emitting unit 10, a gas cell 20, a light receiving unit 30, a duct side gas introducing unit 40, a first duct side gas deriving unit 81, and a second duct side gas deriving unit 82. At least.
  • the gas cell 20 includes a cell side gas introduction unit 22, a first cell side gas derivation unit 24, and a second cell side gas derivation unit 25.
  • An analysis processing unit 50 is connected to the light receiving unit 30.
  • the gas cell 20 is supported by a duct side gas introduction part 40, a first duct side gas lead part 81, and a second duct side gas lead part 82 fixed to the duct 70.
  • the gas analyzer 2 and the duct 70 are fixed integrally.
  • the duct side gas introduction part 40 is fixed in advance to the cell side gas introduction part 22, the first duct side gas lead part 81 is fixed in advance to the first cell side gas lead part 24, and the second cell side gas lead part 25, the second duct side gas outlet 82 is fixed in advance, and the duct side gas inlet 40, the first duct side gas outlet 81, and the second duct side gas outlet 82 are inserted into the holes of the duct 70. .
  • the duct side gas introduction part 40, the first duct side gas lead part 81, and the second duct side gas lead part 82 are previously attached to the duct 70, and then the cell side gas introduction part is connected to the duct side gas introduction part 40. 22 is fixed, the first cell side gas outlet 24 is fixed to the first duct side gas outlet 81, and the second cell side gas outlet 25 is fixed to the second duct side gas outlet 82. May be.
  • such a laser gas analyzer 2 has a gas introduction according to the present invention particularly by the duct side gas introduction part 40 and the cell side gas introduction part 22. And communicates with the gas cell 20 so that the flow path between the first cell side gas outlet 24 and the first duct side gas outlet 81 is located between the light emitting unit 10 and the cell side gas inlet 22. A first gas outlet part is formed, and a flow path between the second cell side gas outlet part 25 and the second duct side gas outlet part 82 is positioned between the cell side gas inlet part 22 and the light receiving part 30. The difference is that a second gas lead-out portion communicating with the gas cell 20 is formed.
  • the measurement space 21 and flow path of the duct side gas introduction part 40, the cell side gas introduction part 22, and the gas cell 20 are formed, and are branched to be referred to as a first cell side gas lead part 24 and a first duct side gas lead part 81.
  • the difference is that the first flow path and the second flow path, that is, the second cell-side gas outlet 25 and the second duct-side gas outlet 82 are formed.
  • the gas to be analyzed is introduced into the vicinity of the center of the measurement space 21 of the gas cell 20, particularly via the duct side gas introduction part 40 and the cell side gas introduction part 22, and further branches to the first cell. Derived in two places from the first flow path called the side gas lead-out part 24 and the first duct side gas lead-out part 81 and the second flow path as the second cell-side gas lead-out part 25 and the second duct side gas lead-out part 82 Is done.
  • the laser gas analyzer 3 includes a light emitting unit 10, a gas cell 20, a light receiving unit 30, a duct side gas introducing unit 40, a first duct side gas deriving unit 81, and a second duct side gas deriving unit 82.
  • Two purge gas introduction units 90 are provided at least.
  • the gas cell 20 includes a cell side gas introduction unit 22, a first cell side gas derivation unit 24, and a second cell side gas derivation unit 25.
  • An analysis processing unit 50 is connected to the light receiving unit 30.
  • the gas cell 20 is supported by the duct side gas introduction part 40, the first duct side gas lead part 81, and the second duct side gas lead part 82 fixed to the duct 70,
  • the laser gas analyzer 3 and the duct 70 are fixed integrally.
  • such a laser gas analyzer 3 has a single purge gas introduction unit 90 in the vicinity of the light emitting unit 10 and the light emitting unit 10.
  • the purge cell introduction unit 90 communicates with the gas cell 20 so as to be positioned between the first cell side gas deriving unit 24, and one purge gas introduction unit 90 is in the vicinity of the light receiving unit 30 and the light receiving unit 30 and the second cell side gas deriving unit 25.
  • the purge gas is introduced in the vicinity of the light emitting unit 10 and the light receiving unit 30 in communication with the gas cell 20 so as to be positioned between the light emitting unit 10 and the light receiving unit 30.
  • a purge gas is blown around the light emitting unit 10, and the purge gas is derived from the first cell side gas deriving unit 24 and the first duct side gas deriving unit 81, thereby causing the purge gas in the vicinity of the light emitting unit 10.
  • the gas to be analyzed is less likely to approach the transparent window of the light emitting unit 10, and the purge gas is blown around the light receiving unit 30 to generate the second cell side gas deriving unit 25 and the second duct side gas deriving unit 82.
  • the purge gas By deriving the purge gas from the gas, the flow of the purge gas is formed in the vicinity of the light emitting unit 10 to make it difficult for the analysis target gas to approach the transparent window of the light receiving unit 30. Note that the laser light is not absorbed even in the presence of the purge gas, so that the measurement is not affected.
  • the measurement target gas is introduced into the vicinity of the center of the measurement space 21 of the gas cell 20 via the duct side gas introduction part 40 and the cell side gas introduction part 22, and further branches to the first cell. Derived in two places from the first flow path called the side gas lead-out part 24 and the first duct side gas lead-out part 81 and the second flow path as the second cell-side gas lead-out part 25 and the second duct side gas lead-out part 82.
  • the measurement target gas does not easily reach the light transmission window of the light emitting unit 10 or the light receiving unit 30 and does not stay in the measurement space 21 of the gas cell 20. Therefore, particulate matter (PM) or the like is less likely to adhere to the wall surface of the measurement space 21 of the gas cell 20 and the light transmission windows of the light emitting unit 10 and the light receiving unit 30, and high-precision detection is possible over a long period of time. This has the effect of improving the accuracy and stability of gas concentration measurement.
  • PM particulate matter
  • the laser gas analyzer 4 includes at least a light emitting unit 10, a gas cell 20, a light receiving unit 30, a duct side gas introducing unit 40, a duct side gas deriving unit 80, an introducing side valve 101, a deriving side valve 102, and a control unit 110.
  • the gas cell 20 includes a cell side gas introduction part 22 and a cell side gas lead-out part 23.
  • An analysis processing unit 50 is connected to the light receiving unit 30, and a control unit 110 is connected to the introduction side valve 101 and the outlet side valve 102.
  • the analysis processing unit 50 and the control unit 110 may be arranged around the light receiving unit 30 or may be arranged at a remote location via a communication cable.
  • the gas cell 20 is supported by the duct side gas introduction part 40 and the duct side gas outlet part 80 fixed to the duct 70, and the laser type gas analyzer 4 and the duct 70 are connected. It is fixed integrally.
  • This laser type gas analyzer 4 includes an introduction side valve 101 between the cell side gas introduction part 22 and the duct side gas introduction part 40 in addition to the configuration of the laser type gas analyzer 1 of the first embodiment of FIG.
  • a derivation side valve 102 is additionally arranged between the cell side gas derivation unit 23 and the duct side gas derivation unit 80.
  • the inlet side valve 101 and the outlet side valve 102 can be controlled to open and close by the control unit 110 or manually.
  • the inlet side valve 101 and the outlet side valve 102 are opened and the gas to be analyzed is introduced into the measurement space 21 of the gas cell 20.
  • the inlet side valve 101 and the outlet side valve 102 are closed.
  • the gas to be analyzed is not introduced into the measurement space 21 of the gas cell 20.
  • the laser gas analyzer 5 includes a light emitting unit 10, a gas cell 20, a light receiving unit 30, a duct side gas introducing unit 40, a first duct side gas deriving unit 81, a second duct side gas deriving unit 82, an introduction side valve 101, a first side.
  • a first outlet side valve 103, a second outlet side valve 104, and a control unit 110 are provided.
  • the gas cell 20 includes a cell side gas introduction unit 22, a first cell side gas derivation unit 24, and a second cell side gas derivation unit 25.
  • An analysis processing unit 50 is connected to the light receiving unit 30, and a control unit 110 is connected to the introduction side valve 101, the first derivation side valve 103, and the second derivation side valve 104.
  • a laser type gas analyzer 5 the gas cell 20 is supported by the duct side gas introduction part 40, the first duct side gas lead part 81, and the second duct side gas lead part 82 fixed to the duct 70, The laser type gas analyzer 5 and the duct 70 are fixed integrally.
  • This laser type gas analyzer 5 includes an introduction side valve 101 between the cell side gas introduction part 22 and the duct side gas introduction part 40 in addition to the configuration of the laser type gas analyzer 2 of the second embodiment of FIG.
  • the first derivation side valve 103 is provided between the first cell side gas derivation unit 24 and the first duct side gas derivation unit 81, and the second cell side gas derivation unit 25 and the second duct side gas derivation unit 82
  • the second outlet side valve 104 is additionally arranged between the two.
  • the introduction side valve 101, the first derivation side valve 103, and the second derivation side valve 104 can be controlled to open and close by the control unit 110 or manually.
  • the introduction side valve 101, the first derivation side valve 103 and the second derivation side valve 104 are opened to introduce the gas to be analyzed into the measurement space 21 of the gas cell 20, but at the time other than the measurement, the introduction side valve 101, the first derivation side valve 103 and the second derivation side valve 104 are closed, and the analysis target gas is not introduced into the measurement space 21 of the gas cell 20.
  • the laser gas analyzer 6 includes a light emitting unit 10, a gas cell 20, a light receiving unit 30, a duct side gas introducing unit 40, a first duct side gas deriving unit 81, a second duct side gas deriving unit 82, and two purge gas introducing units. 90, at least an introduction side valve 101, a first derivation side valve 103, a second derivation side valve 104, and a control unit 110.
  • the gas cell 20 includes a cell side gas introduction unit 22, a first cell side gas derivation unit 24, and a second cell side gas derivation unit 25.
  • An analysis processing unit 50 is connected to the light receiving unit 30, and a control unit 110 is connected to the introduction side valve 101, the first derivation side valve 103, and the second derivation side valve 104.
  • a laser type gas analyzer 6 the gas cell 20 is supported by the duct side gas introduction part 40, the first duct side gas lead part 81, and the second duct side gas lead part 82 fixed to the duct 70, The laser type gas analyzer 6 and the duct 70 are fixed integrally.
  • This laser type gas analyzer 6 includes an introduction side valve 101 between the cell side gas introduction part 22 and the duct side gas introduction part 40 in addition to the configuration of the laser type gas analyzer 3 of the third embodiment of FIG.
  • the first derivation side valve 103 is provided between the first cell side gas derivation unit 24 and the first duct side gas derivation unit 81, and the second cell side gas derivation unit 25 and the second duct side gas derivation unit 82
  • the second outlet side valve 104 is additionally arranged between the two.
  • the introduction side valve 101, the first derivation side valve 103, and the second derivation side valve 104 can be controlled to open and close by the control unit 110 or manually.
  • the introduction side valve 101, the first derivation side valve 103 and the second derivation side valve 104 are opened to introduce the gas to be analyzed into the measurement space 21 of the gas cell 20, but at the time other than the measurement, the introduction side valve 101, the first derivation side valve 103 and the second derivation side valve 104 are closed, and the analysis target gas is not introduced into the measurement space 21 of the gas cell 20.
  • the light emitting unit 10 is disposed below the gas cell 20, and the light receiving unit 30 is disposed above the gas cell 20.
  • the light receiving unit 30 may be disposed below the gas cell 20 and the light emitting unit 10 may be disposed above the gas cell 20 to irradiate the laser beam downward. Even if it is such a form, implementation of this invention is possible and the same effect is acquired.
  • the shape of the opening 41 is a nozzle shape in which the diameter of the gas to be analyzed expands along the flow direction of the analysis target gas. Or a straight tubular opening having the same diameter. Further, it has been described that the position of the opening 41 is most preferably in the vicinity of the center of the flow path 71 of the duct 70. However, depending on the size of the diameter of the duct 70, the flow rate of the analysis target gas, and the like You may do it.
  • the laser gas analyzer of the present invention is suitable for use in a place with a lot of vibration in a narrow place such as a ship. In addition, it is not intended to be limited to such applications, and is optimal for measuring flue gas such as boilers and garbage incineration.
  • gas analysis for steel [blast furnace, converter, heat treatment furnace, sintering (pellet equipment), coke oven], fruit and vegetable storage and ripening, biochemistry (microorganism) [fermentation], air pollution [incinerator, flue gas desulfurization / Denitration], exhaust gas from internal combustion engines (removal tester), disaster prevention [explosive gas detection, toxic gas detection, new building material combustion gas analysis], plant growth, chemical analysis [oil refinery plant, petrochemical plant, gas generation plant ], It is also useful as an analyzer for the environment [landing concentration, concentration in tunnel, parking lot, building management], various physics and chemistry experiments.
  • Laser gas analyzer 10 Light emitting unit 20: Gas cell 21: Measurement space 22: Cell side gas introducing unit 23: Cell side gas deriving unit 24: First cell side gas deriving Unit 25: second cell side gas deriving unit 30: light receiving unit 40: duct side gas introducing unit 41: opening 50: analysis processing unit 70: duct 71: flow path 80: duct side gas deriving unit 81: first duct side Gas outlet 82: second duct side gas outlet 90: purge gas inlet 100: valve 101: inlet side valve 102: outlet side valve 103: first outlet side valve 104: second outlet side valve 110: controller

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  • Spectroscopy & Molecular Physics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
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Abstract

L'invention concerne un analyseur de gaz de type laser qui, en adoptant une structure selon laquelle un écart d'axe optique a peu de chances de se produire, est facile à installer et analyse avec précision, sur une longue période de temps, la concentration gazeuse d'un gaz à faible concentration qui doit être mesuré, qui se trouve dans un gaz qui doit être analysé. Un analyseur de gaz de type laser (1) est configuré de telle sorte : qu'une cellule à gaz cylindrique (20) soit disposée sur le côté externe d'un conduit (70) ; qu'une ouverture (41) d'une unité d'introduction de gaz côté conduit (40) soit ménagée dans le passage du conduit (70) dans lequel circule un gaz qui doit être mesuré ; et que le gaz qui doit être mesuré, soit détecté après avoir été introduit dans un espace de mesure (21) dans la cellule à gaz (20).
PCT/JP2015/062948 2015-04-30 2015-04-30 Analyseur de gaz de type laser WO2016174759A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106770025A (zh) * 2017-01-23 2017-05-31 中冶焦耐(大连)工程技术有限公司 激光气体分析仪测量焦炉煤气氧含量的旁通取样方法
CN112444498A (zh) * 2020-11-17 2021-03-05 安徽蓝之青环保科技有限公司 一种紫外烟气分析仪及其分析方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS481985U (fr) * 1971-05-26 1973-01-11
JPH0220153U (fr) * 1988-07-25 1990-02-09
JP2011013073A (ja) * 2009-07-01 2011-01-20 Tsukasa Sokken Co Ltd オパシメータにおける発光素子光度補償装置
JP2012052834A (ja) * 2010-08-31 2012-03-15 Yokogawa Electric Corp レーザガス分析計
JP2012137429A (ja) * 2010-12-27 2012-07-19 Mitsubishi Heavy Ind Ltd レーザ計測装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS481985U (fr) * 1971-05-26 1973-01-11
JPH0220153U (fr) * 1988-07-25 1990-02-09
JP2011013073A (ja) * 2009-07-01 2011-01-20 Tsukasa Sokken Co Ltd オパシメータにおける発光素子光度補償装置
JP2012052834A (ja) * 2010-08-31 2012-03-15 Yokogawa Electric Corp レーザガス分析計
JP2012137429A (ja) * 2010-12-27 2012-07-19 Mitsubishi Heavy Ind Ltd レーザ計測装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106770025A (zh) * 2017-01-23 2017-05-31 中冶焦耐(大连)工程技术有限公司 激光气体分析仪测量焦炉煤气氧含量的旁通取样方法
CN112444498A (zh) * 2020-11-17 2021-03-05 安徽蓝之青环保科技有限公司 一种紫外烟气分析仪及其分析方法
CN112444498B (zh) * 2020-11-17 2023-03-31 安徽蓝之青环保科技有限公司 一种紫外烟气分析仪及其分析方法

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