A gas analysis device suitable for high temperature and high humidity environments

Abstract

The application relates to a gas analysis device suitable for a high-temperature and high-humidity environment, which comprises a measuring pool, a light source, a light ray detector and a gas analysis module, the measuring pool is arranged in the high-temperature and high-humidity environment, the light source, the light ray detector and the gas analysis module are arranged in a metal shell far away from the high-temperature and high-humidity environment, and the shell is connected with the measuring pool through a heat insulation long cylinder; a mirror assembly and a window mirror assembly are arranged in the measuring pool; the light source and the light ray detector are fixed side by side in the shell and are in the same light path with the window mirror assembly and the mirror assembly; a constant temperature protection area is arranged in the shell, and the light source, the light ray detector and the gas analysis module are arranged in the constant temperature protection area. The application can realize real-time online monitoring of the gas in the high-temperature and high-humidity environment, has simple structure, small design, high measuring precision, can protect electronic elements and prolong the service life of the analysis device.

Description

TECHNICAL FIELD

[0001] The present application relates to a gas analysis device, in particular to a gas analysis device suitable for high temperature and high humidity environment, and belongs to the technical field of environmental monitoring equipment. BACKGROUND

[0002] In the petroleum, chemical, metallurgical, electric power, pharmaceutical and other industries, toxic and harmful gases (such as carbon dioxide, methane, sulfur dioxide, etc.) are inevitably produced. In order to ensure production safety and environmental protection, it is necessary to effectively and accurately monitor the concentration and composition of the discharged gas. The existing technology mostly uses non-dispersive infrared gas analysis technology (NDIR) to analyze the spectral intensity of the collected gas to obtain the parameters. However, the monitored gas is mostly in a high temperature and high humidity environment. Electronic components that are in such an environment for a long time are not only easy to damage, but also affect the measurement accuracy.

[0003] In order to overcome the above problems, the traditional method is to analyze and measure the gas after sampling. However, this method cannot reflect the real-time state of the gas environment, and the analysis method is mostly point measurement, which cannot obtain the spatial distribution of the gas concentration. In order to monitor online, some methods introduce the gas to be detected through a pipeline, and then analyze and process it after cooling treatment. However, loss will inevitably occur during the gas extraction process, so the accuracy of the measurement result is low. Some methods use high-temperature-resistant electronic components for monitoring. Not only is the cost high, but the measurement accuracy will also decrease after a long time of operation. Moreover, maintenance and repair need to overcome the influence of high temperature and high humidity environment. SUMMARY

[0004] In view of the shortcomings of the prior art, the present application provides a gas analysis device for high temperature and high humidity environment, which can realize real-time online monitoring of gas in high temperature and high humidity environment. The device has simple structure, small size, high measurement accuracy, can protect electronic components, and can improve the service life of the analysis device.

[0005] To achieve the above object, the application discloses a gas analysis device suitable for high-temperature and high-humidity environment, which comprises a measuring pool, a light source, an optical gas sensor and a gas analysis module. The measuring pool is arranged in the high-temperature and high-humidity environment, the light source, the optical gas sensor and the gas analysis module are arranged in a metal shell away from the high-temperature and high-humidity environment, and the shell is connected with the measuring pool through a heat insulation long cylinder. A mirror assembly and a window mirror assembly are arranged in the measuring pool. The window mirror assembly is fixedly arranged at a middle position of the measuring pool and divides the measuring pool into a measuring section and a sealing section. The mirror assembly is fixedly arranged in the measuring section. An air hole is arranged on a side wall of the measuring section. The sealing section is communicated with the heat insulation long cylinder. The light source and the optical gas sensor are fixedly arranged in the shell and are in the same light path with the window mirror assembly and the mirror assembly. The light emitted by the light source passes through the window mirror assembly and enters the measuring section filled with the gas to be measured. The light is reflected by the mirror assembly and is absorbed by the optical gas sensor. The optical gas sensor converts the absorbed light signal into an electric signal and sends the electric signal to the gas analysis module. A constant temperature protection area is arranged in the shell. The light source, the optical gas sensor and the gas analysis module are arranged in the constant temperature protection area.

[0006] As a further improvement, the constant temperature protection area comprises a heat insulation shell, a refrigeration component and a temperature sensor arranged in the heat insulation shell. The refrigeration end of the refrigeration component faces the light source, the optical gas sensor and the gas analysis module. The refrigeration component is configured to control the temperature of the constant temperature protection area according to the temperature sensor. The heat insulation shell is arranged outside the light source, the optical gas sensor and the gas analysis module.

[0007] As a further improvement, the light source is an infrared light source. The optical gas sensor is a double-channel infrared gas sensor, which comprises a measuring channel and a reference channel. The measuring channel is used for receiving the signal of the gas to be measured. The reference channel is used for receiving the signal of the non-absorption wave band.

[0008] As a further improvement, the gas analysis module comprises a circuit board and a main control board. The power supply and the optical gas sensor are mounted on the circuit board. The circuit board is fixedly arranged in the shell through a circuit board mounting part. The circuit board is signal-connected with the main control board.

[0009] As a further improvement, the shell comprises a shell body, a front cover and a rear cover. A partition plate is arranged in the shell body. The main control board is arranged on one side of the partition plate. The power supply, the optical gas sensor and the circuit board are arranged on the other side of the partition plate. The heat insulation shell is arranged outside the power supply, the optical gas sensor and the circuit board. The front cover is connected with the shell body on the side where the main control board is arranged. The rear cover is connected with the shell body on the side where the circuit board is arranged.

[0010] As a further improvement, the refrigeration component is a semiconductor refrigeration sheet. The cold end of the refrigeration sheet faces the circuit board mounting part. The hot end of the refrigeration sheet transmits heat to the shell through a heat conduction pad.

[0011] As a further improvement, the mirror assembly comprises a mirror pressing plate, a buffer washer and a mirror arranged in sequence, the mirror pressing plate fixes the mirror at the end of the measuring cell through the buffer washer.

[0012] As a further improvement, the vertical distance between the light source and the mirror is 80-150mm, the mirror is configured to reflect the light uniformly covering the reference channel and the measuring channel, and the light signal received by the two channels changes consistently, and the surface of the mirror is plated with a protective gold film.

[0013] As a further improvement, the window mirror assembly comprises a window sheet pressing ring, a window sheet and a sealing washer arranged in sequence, the window sheet pressing ring tightly fixes the window sheet and the sealing washer at the window of the sealed section of the measuring cell.

[0014] As a further improvement, the gas analysis module is used to calculate the gas concentration in the measuring cell, the channel in the optical gas sensor that receives the signal of the to-be-measured gas wave band is defined as the measuring channel, the channel in the optical gas sensor that receives the signal of the non-absorption wave band is defined as the reference channel, the signal received by the reference channel includes the window mirror assembly reflection signal and the mirror assembly reflection signal, and is defined as V Refe =V Win,Refe +V Refl,Refe The signal received by the measuring channel includes the window mirror assembly reflection signal and the mirror assembly reflection signal, and is defined as V Meas =V Win,Meas +V Refl,Meas The measured value of the gas concentration is as follows:

[0015]

[0016] Wherein, V0 is the signal received by the reference channel when the measuring cell is connected to zero gas, V1 is the signal received by the measuring channel when the measuring cell is connected to zero gas, V Win,Refe V2 is the window mirror assembly reflection signal received by the reference channel when the measuring cell is connected to the to-be-measured gas, V Refl,Refe V3 is the mirror assembly reflection signal received by the reference channel when the measuring cell is connected to the to-be-measured gas, V Win,Meas V4 is the window mirror assembly reflection signal received by the measuring channel when the measuring cell is connected to the to-be-measured gas, V Refl,Meas V5 is the mirror assembly reflection signal received by the measuring channel when the measuring cell is connected to the to-be-measured gas.

[0017] The beneficial effects of the present application are:

[0018] 1) The gas analysis device provided by the present application can install the measuring cell in a high-temperature and high-humidity environment for real-time online monitoring, has fast response speed and high measurement accuracy;

[0019] 2) The measuring pool and the electronic components are separated by the heat insulation long tube, a constant temperature protection area is arranged around the electronic components, the electronic components can be in a stable environment, the stability of the measuring environment is guaranteed, and the measuring precision is further improved;

[0020] 3) The measuring pool is arranged in a single-end type in a high temperature and high humidity environment, the light path is one-time reflection and return measurement, the concave mirror with a gold plating protection film and the double-channel infrared detector are selected, the infrared band high reflectivity is guaranteed, the light intensity attenuation is reduced, the zero degree calibration and the reflection calibration are used when the gas concentration is calculated, the influence of the window piece reflection signal is eliminated, and the accuracy of the measurement data is guaranteed;

[0021] 4) The measuring pool is divided into a measuring section and a sealed section through the window mirror assembly, the outflow of the to-be-measured gas is effectively prevented, the light path is avoided from being prolonged, and the data accuracy is affected; and the window mirror adopts the coated silicon wafer, so that the infrared band transmittance is increased, the light intensity is increased, and the reflected light interference is reduced.

[0022] 5) The heat end of the refrigeration device transmits heat to the shell through the heat conduction pad, the shell is made of heat conduction metal material as a whole, heat transmission and heat dissipation are accelerated, and the constant temperature environment of the electronic components is further guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 The perspective view of the application;

[0024] Figure 2 The cross-sectional axonometric view of the application;

[0025] Figure 3 The cross-sectional view of the application;

[0026] Figure 4 The perspective view of the measuring pool in the application;

[0027] Figure 5 The cross-sectional view of the measuring pool in the application;

[0028] Figure 6 The light spot change diagram of the mirror with a 50mm focal length in the specific embodiment reflected on the optical gas sensor under different spacings;

[0029] Figure 7 The light spot change diagram of the mirror with a 75mm focal length in the specific embodiment reflected on the optical gas sensor under different spacings;

[0030] Figure 8 The light spot simulation diagram of different mirrors reflected on the actual receiving surface of the optical gas sensor in the specific embodiment;

[0031] In the figure: 1, the measuring pool, 1.1, the measuring section, 1.1.1, the air hole, 1.2, the sealed section;

[0032] 2. Light source;

[0033] 3. Optical gas sensor;

[0034] 4. Gas analysis module, 4.1. Circuit board, 4.2. Main control board;

[0035] 5. Shell, 5.1. Shell body, 5.2. Front cover, 5.3. Rear cover, 5.4. Partition;

[0036] 6. Heat insulation long tube;

[0037] 7. Mirror assembly, 7.1. Mirror pressing plate, 7.2. Buffer washer, 7.3. Mirror;

[0038] 8. Window mirror assembly, 8.1. Window piece pressing ring, 8.2. Window piece, 8.3. Sealing washer;

[0039] 9. Heat insulation shell;

[0040] 10. Refrigeration piece;

[0041] 11. Temperature sensor;

[0042] 12. Circuit board mounting piece;

[0043] 13. Heat conduction pad. DETAILED DESCRIPTION

[0044] The present application will be further described below in conjunction with the drawings and specific embodiments.

[0045] As Figures 1 to 5As shown, a gas analysis device suitable for high temperature and high humidity environment includes a measuring cell 1, a light source 2, an optical gas sensor 3 and a gas analysis module 4, the measuring cell 1 is arranged in a high temperature and high humidity environment, the light source 2, the optical gas sensor 3 and the gas analysis module 4 are arranged in a metal shell 5 away from the high temperature and high humidity environment, and the shell 5 is connected with the measuring cell 1 through a heat insulation long tube 6; The mirror assembly 7 and the window mirror assembly 8 are arranged in the measuring cell 1, the window mirror assembly 8 is sealingly fixed at the middle position of the measuring cell 1 and divides the measuring cell 1 into a measuring section 1.1 and a sealing section 1.2, the mirror assembly 7 is fixed in the measuring section 1.1, the side wall of the measuring section 1.1 is provided with a ventilation hole 1.1.1, and the sealing section 1.2 is communicated with the heat insulation long tube 6; The light source 2 and the optical gas sensor 3 are fixed side by side in the shell 5 and are in the same optical path with the window mirror assembly 8 and the mirror assembly 7, the light emitted by the light source 2 passes through the window mirror assembly 8 and enters the measuring section filled with the gas to be measured, and is reflected by the mirror assembly 7 and absorbed by the optical gas sensor 3, the optical gas sensor 3 converts the absorbed light signal into an electrical signal and sends it to the gas analysis module 4; The shell 5 is provided with a constant temperature protection area, and the light source, the optical gas sensor and the gas analysis module are arranged in the constant temperature protection area.

[0046] The shell 5 and the constant temperature protection area are both provided with through holes corresponding to the positions of the light source and the optical gas sensor, so that the light signal can pass through.

[0047] The constant temperature protection area includes a heat insulation shell 9, a refrigeration part 10 and a temperature sensor 11 arranged in the heat insulation shell, the refrigeration end of the refrigeration part 10 faces the light source 2, the optical gas sensor 3 and the gas analysis module 4, the refrigeration part 10 is configured to control the temperature of the constant temperature protection area according to the temperature sensor 11, and the heat insulation shell 9 covers the outside of the light source 2, the optical gas sensor 3 and the gas analysis module 4.

[0048] The gas analysis device provided in the application separates the electronic elements and the measuring cell of the gas analyzer by the heat insulation long tube, the measuring cell 1 is divided into a measuring section 1.1 and a sealing section 1.2 by the light-transmitting window mirror assembly 8, the measuring section 1.1 is located in the high-temperature and high-humidity environment of the gas to be measured, the gas to be measured enters the measuring cell in real time through the air hole 1.1.1 on the side wall of the measuring section 1.1, the light emitted by the light source 2 passes through the heat insulation long tube 6, passes through the window sheet in the window mirror assembly 8 and enters the gas to be measured in the measuring section 1.1, and then is reflected by the mirror assembly 7 and captured by the optical gas sensor 3 to be converted into an electrical signal and transmitted to the gas analysis module 4 for gas component and concentration analysis. In order to ensure the stability of the electronic elements of the gas analyzer, the refrigerating element 10, the temperature sensor 11 and the heat insulation shell 9 are arranged near the electronic elements, the temperature sensor 11 monitors the temperature near the electronic elements in real time and sends a signal to the gas analysis module 4, and the gas analysis module 4 controls the refrigerating element 10 to cool the electronic elements in real time according to the preset program, so that the electronic elements such as the light source 2, the optical gas sensor 3 and the gas analysis module 4 are always in a relatively constant temperature environment, the stability of the measurement is ensured, and the measurement accuracy is improved. The window mirror assembly 8 separates the heat insulation long tube 6 and the measuring environment, so that the gas to be measured can be prevented from entering the heat insulation long tube 6 to prolong the measurement light path and ensure the accuracy of the measurement data as much as possible.

[0049] The light source 2 is an infrared light source; the optical gas sensor 3 is a double-channel infrared gas sensor, which includes a measuring channel and a reference channel, the measuring channel is used for receiving the signal of the gas to be measured, and the reference channel is used for receiving the signal of the non-absorption wave band. The double-channel optical gas sensor sends signals to the gas analysis module for comprehensive calculation, thereby improving the calculation accuracy. In other embodiments, single-channel detectors, four-channel detectors and the like can also be used.

[0050] As shown in Figure 2 and 3 In the embodiment, the gas analysis module 4 includes a circuit board 4.1 and a main control board 4.2, the power supply 2 and the optical gas sensor 3 are installed on the circuit board 4.1, the circuit board 4.1 is fixed in the shell 5 by the circuit board mounting element 12, and the circuit board 4.1 is signal-connected with the main control board 4.2.

[0051] In order to facilitate installation, disassembly and maintenance, as preferred, the shell 5 comprises a shell body 5.1, a front cover 5.2 and a rear cover 5.3, a partition plate 5.4 is arranged in the shell body 5.1, the main control board 4.2 is arranged on one side of the partition plate 5.4, the power supply 2, the optical gas sensor 3 and the circuit board 4.1 are arranged on the other side of the partition plate 5.4, the heat insulation shell 9 is arranged outside the power supply 2, the optical gas sensor 3 and the circuit board 4.1, the front cover 5.2 is connected with the shell body 5.1 on which the main control board 4.2 is arranged, and the rear cover 5.3 is connected with the shell body 5.1 on which the circuit board 4.1 is arranged. The main control board 4.2 is separated from the power supply 2, the optical gas sensor 3 and the circuit board 4.1 by the partition plate, only a small amount of key electronic components such as the refrigeration fin power supply circuit, the temperature sensor, the power supply and the optical gas sensor are arranged on the circuit board 4.1, so as to reduce interference, facilitate constant temperature, and facilitate fixation and size reduction in structure. Of course, in other embodiments, the main control board and the circuit board can also be designed integrally.

[0052] The refrigeration piece 10 is a semiconductor refrigeration fin, the cold end of the refrigeration fin faces the circuit board mounting piece 12, and the hot end of the refrigeration fin transmits heat to the shell 5 through the heat conduction pad 13. After the power supply is turned on, the refrigeration fin transmits the heat of the circuit board mounting piece 12 to the shell 5, the transmission efficiency is high, and the control is facilitated.

[0053] As shown in Figs. 1 and 2, the optical gas sensor 3 comprises a light source 2, a measuring pool 1, a mirror assembly 7 and a circuit board 4.1. Figure 1 and Figure 2 As shown in Figs. 1 and 2, the optical gas sensor 3 comprises a light source 2, a measuring pool 1, a mirror assembly 7 and a circuit board 4.1.

[0054] The vertical distance from the light source 2 to the mirror 7.3 is 80-150 mm, the mirror 7.3 is configured to reflect light to uniformly cover the reference channel and the measuring channel, and the light signal changes of the two channels are consistent; the surface of the mirror 7.2 is provided with a gold protective film.

[0055] The selection of the mirror model is determined according to the optical path design, and a specific embodiment is described in detail.

[0056] Take the carbon dioxide concentration analysis device as an example, in order to heat insulation and reduce the light intensity attenuation, the vertical distance between the light source 2 and the mirror 7.3 is selected as 80-150mm, since the light path is a one-way reflection return, which belongs to a symmetrical structure, according to the lens imaging formula: 1 / f=1 / u+1 / v, where f is the focal length, convex positive and concave negative; u is the object distance; v is the image distance, the focal length of the concave mirror is selected in the range of 40-75mm. Through the simulation design analysis of the light path, the light spot change diagram of the mirror with 50mm focal length and 75mm focal length under the distance of 80-150mm is shown in Figure 6 and Figure 7 The light spot energy size under each parameter is compared:

[0057]

[0058] Considering the high temperature environment, large temperature change, in order to avoid the influence of the external environment on the structure, which leads to the sharp change of light intensity, when designing, the light reflected by the mirror 7.3 should be able to uniformly cover the reference channel and the measurement channel of the optical gas sensor 3, and the light signals received by the two channels should change as much as possible, that is, even if some changes occur in temperature or structure, it will not affect the intensity value of the light received by the detector to change greatly, thereby improving the stability and accuracy of the measurement data.

[0059] As shown in Figure 8 The mirror with 50mm focal length, 150mm spacing, 75mm focal length, 80mm spacing and 75mm focal length, 100mm spacing can cover the reference channel and the measurement channel of the optical gas sensor 3. However, when using the mirror with 50mm focal length and 150mm spacing, the light intensity attenuation is larger; and the mirror with 75mm focal length has good performance in the distance of 80mm-100mm, and the energy received by the two channels is stronger when the distance is 100mm, so the gold-plated high-reflectivity concave mirror with 75mm focal length and 100mm spacing is the best choice.

[0060] As shown in Figure 1 and Figure 2 The window mirror assembly 8 includes a window sheet pressing ring 8.1, a window sheet 8.2 and a sealing gasket 8.3 arranged in sequence, and the window sheet pressing ring 8.1 tightly fixes the window sheet 8.2 and the sealing gasket 8.3 at the window of the measuring pool sealing section 1.2. The window sheet 8.2 adopts a coated silicon sheet to increase the transmission rate in the infrared wave band, increase the light intensity and reduce the interference of reflected light.

[0061] The shell body 5.1, the front cover 5.2 and the rear cover 5.3 all adopt heat-conducting metal. In this embodiment, heat-conducting aluminum material is used, and other heat-conducting metals with high thermal conductivity coefficient can also be used to ensure the heat dissipation effect of the shell.

[0062] Specifically, the gas analysis module 4 is used to calculate the gas concentration in the measuring cell 1, the signal received by the reference channel of the optical gas sensor 3 includes the window mirror assembly reflection signal and the mirror assembly reflection signal, the signal received by the measuring channel includes the window mirror assembly reflection signal and the mirror assembly reflection signal, the interference of the mirror reflection signal value is eliminated through zero calibration and reflection calibration, the corresponding relationship between the gas concentration measurement value and the gas concentration is obtained through range calibration, and finally the gas concentration calculation is as follows:

[0063]

[0064] Wherein, FSL is the range value, f(FSL) is the concentration measurement value in the full range state, f(C) is the current concentration measurement value, and k is a constant calculated according to the zero calibration and reflection calibration.

[0065] In order to eliminate the interference of the window sheet reflection signal and improve the measurement accuracy,

[0066] The first step is to introduce zero gas into the measuring cell for zero calibration, and the received signals of the reference channel and the measuring channel are obtained respectively, the received signals include the window sheet reflection signal and the mirror reflection signal, wherein, The signal received by the reference channel when the zero gas is introduced into the measuring cell, The window sheet reflection signal received by the reference channel, The mirror reflection signal received by the reference channel; The signal received by the measuring channel when the zero gas is introduced into the measuring cell, The window sheet reflection signal received by the measuring channel, The mirror reflection signal received by the measuring channel.

[0067] The second step is to fill the absorbing sheet between the window sheet and the mirror for reflection calibration, and the received signals of the reference channel and the measuring channel are obtained respectively And the received signal of the measuring channel At this time, the reflection signal is 0, the received signal only includes the window sheet reflection signal, and the corresponding relationship between the concentration measurement value f(C) and the measured concentration C is obtained:

[0068]

[0069] The third step is to calibrate the analysis device in the full range state to obtain the measuring channel coefficient k Meas :

[0070]

[0071] Wherein, For constant, defined as k, FSL is the range value, f(FSL) is the concentration measurement value in full scale state.

[0072] Fourthly, the reference channel receiving signal and the measurement channel receiving signal are obtained respectively when the to-be-measured gas is introduced into the measuring cell, i.e., in a normal measurement state, at this time, the reference channel has substantially no absorption to the to-be-measured target gas, and the gas concentration is calculated according to all the measurement values, and the final gas concentration calculation formula is as follows:

[0073]

[0074] Wherein, f(C) is the current gas concentration measurement value.

[0075] The beneficial effects of the present application are as follows:

[0076] 1) The gas analysis device provided by the present application can be installed in a high-temperature and high-humidity environment for real-time online monitoring, has fast response speed and high measurement accuracy.

[0077] 2) The measuring cell and the electronic components are separated by the heat-insulating long cylinder, and a constant-temperature protection area is arranged around the electronic components, so that the electronic components can be in a stable environment, thereby ensuring the stability of the measurement environment and further improving the measurement accuracy.

[0078] 3) The single-end design of the measuring cell in the high-temperature and high-humidity environment, the light path is one-time reflection and return measurement, the concave mirror with gold plating protective film and the double-channel infrared detector are selected to ensure high reflectivity in the infrared band, reduce light intensity attenuation, and eliminate the influence of window piece reflection signal through zero-degree calibration and reflection calibration when calculating the gas concentration, thereby ensuring the accuracy of the measurement data.

[0079] 4) The measuring cell is divided into a measurement section and a sealed section by the window mirror assembly, which effectively prevents the to-be-measured gas from seeping out and avoids prolonging the measurement optical path and affecting the data accuracy; and the window mirror uses a coated silicon wafer to increase the infrared band transmittance, increase the light intensity, and reduce the reflection light interference.

[0080] 5) The heat end of the refrigeration device transmits heat to the shell through the heat-conducting pad, the shell as a whole adopts a heat-conducting metal material to accelerate heat transfer and heat dissipation, and further ensure the constant-temperature environment of the electronic components.

[0081] In the description of the present application, it should be understood that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as a limitation on the present application.

[0082] In the present application, unless otherwise explicitly specified and limited, for example, can be fixedly connected, or can be detachably connected, or integrated; can be mechanically connected, or electrically connected; can be directly connected, or indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise explicitly limited, the specific meaning of the above-mentioned terms in the present application can be understood according to the specific circumstances by those skilled in the art.

[0083] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and spirits of the present application, and the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A gas analysis device suitable for high temperature and high humidity environments, comprising a measuring cell, a light source, an optical gas sensor, and a gas analysis module, characterized in that, The measuring cell is set in a high-temperature and high-humidity environment. The light source, optical gas sensor, and gas analysis module are arranged in a metal casing away from the high-temperature and high-humidity environment, and the casing is connected to the measuring cell by a heat-insulating long cylinder. The measuring cell is equipped with a reflector assembly and a window mirror assembly. The window mirror assembly is sealed and fixed in the middle of the measuring cell and divides the measuring cell into a measuring section and a sealed section. The reflector assembly is fixed in the measuring section, and the side wall of the measuring section is provided with vent holes. The sealed section is connected to the heat-insulating long cylinder. The light source and the optical gas sensor are fixed side by side in the casing and are on the same optical path as the window mirror assembly and the reflector assembly. The light emitted by the light source passes through the window mirror assembly and enters the measuring section filled with the gas to be measured. After being reflected by the reflector assembly, it is absorbed by the optical gas sensor. The optical gas sensor converts the absorbed light signal into an electrical signal and sends it to the gas analysis module. A constant temperature protection zone is set in the casing, and the light source, optical gas sensor, and gas analysis module are set in the constant temperature protection zone.

2. The gas analysis device suitable for high temperature and high humidity environments as described in claim 1, characterized in that, The constant temperature protection zone includes a heat insulation shell, a cooling component, and a temperature sensor housed inside the heat insulation shell. The cooling end of the cooling component faces the light source, the optical gas sensor, and the gas analysis module. The cooling component is configured to control the temperature of the constant temperature protection zone based on the temperature sensor. The heat insulation shell covers the outside of the light source, the optical gas sensor, and the gas analysis module.

3. The gas analysis device suitable for high temperature and high humidity environments as described in claim 2, characterized in that, The light source is an infrared light source, and the optical gas sensor is a dual-channel infrared gas sensor, including a measurement channel and a reference channel. The measurement channel is used to receive the waveband signal of the gas to be measured, and the reference channel is used to receive the non-absorption waveband signal.

4. The gas analysis device suitable for high temperature and high humidity environments as described in claim 1, characterized in that, The gas analysis module includes a circuit board and a main control board. The power supply and optical gas sensor are mounted on the circuit board, which is fixed inside the housing by a circuit board mounting bracket. The circuit board is connected to the main control board for signal transmission.

5. The gas analysis device suitable for high temperature and high humidity environments as described in claim 3, characterized in that, The outer casing includes a casing body, a front cover, and a rear cover. A partition is disposed inside the casing body. The main control board is disposed on one side of the partition, and the power supply, optical gas sensor, and circuit board are disposed on the other side of the partition. The heat-insulating outer casing covers the outside of the power supply, optical gas sensor, and circuit board. The front cover is connected to the casing body on the side where the main control board is disposed, and the rear cover is connected to the casing body on the side where the circuit board is disposed.

6. The gas analysis device suitable for high temperature and high humidity environments as described in claim 2, characterized in that, The cooling component is a semiconductor cooling chip, with the cold end of the cooling chip facing the circuit board mounting component, and the hot end of the cooling chip transferring heat to the outer casing through a thermal pad.

7. The gas analysis device suitable for high temperature and high humidity environments as described in claim 2, characterized in that, The reflector assembly includes a reflector plate, a buffer washer, and a reflector arranged in sequence. The reflector plate fixes the reflector to the end of the measuring cell through the buffer washer.

8. The gas analysis device suitable for high temperature and high humidity environments as described in claim 7, characterized in that, The vertical distance from the light source to the reflector is 80-150mm. The reflector is configured to uniformly cover the reference channel and the measurement channel with the reflected light, and the light signals received by the two channels change in the same way. The surface of the reflector is coated with a protective gold film.

9. The gas analysis device suitable for high temperature and high humidity environments as described in claim 3, characterized in that, The window mirror assembly includes a window plate retaining ring, a window plate, and a sealing gasket arranged in sequence. The window plate retaining ring presses and fixes the window plate and the sealing gasket at the window of the measuring cell sealing section.

10. The gas analysis apparatus suitable for high temperature and high humidity environments as described in any one of claims 3 to 9, characterized in that, The gas analysis module is used to calculate the gas concentration in the measurement cell. The reference channel of the optical gas sensor receives signals including the reflected signals from the window mirror assembly and the reflector assembly. The measurement channel receives signals including the reflected signals from the window mirror assembly and the reflector assembly. Interference from the reflector reflection signal values ​​is eliminated through zero-point calibration and reflection calibration. The correspondence between the measured gas concentration value and the gas concentration is obtained through range calibration. The final gas concentration calculation is as follows: Where FSL is the range value, f(FSL) is the concentration measurement value at full scale, f(C) is the current concentration measurement value, and k is a constant calculated based on zero-point calibration and reflection calibration.

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