Optical cavity portable multi-component flue gas analysis device and method

Abstract

The invention relates to the technical field of analysis devices, in particular to an optical cavity portable multi-component flue gas analysis device and method. The gas analysis device comprises a gas inlet pipe, a three-way electromagnetic valve, a double-channel optical cavity, a catalytic converter and a device exhaust port; one end of the air inlet pipe is a device air inlet, a three-way electromagnetic valve is arranged on the air inlet pipe, the air inlet pipe is divided into two flow paths through the three-way electromagnetic valve, one flow path directly enters the double-channel optical cavity, and the other flow path enters the double-channel optical cavity after passing through the catalytic converter; and a device exhaust port is formed in the double-channel optical cavity. By arranging the double-flow-path double-channel optical cavity, different functional designs are carried out on each channel optical cavity, so that the measurement of multiple components of gas to be measured can be realized, and the analysis efficiency of the equipment is improved. And the selected absorption spectrum method is easy to carry out portable design in structure, and the field measurement operation can be further simplified by setting different operation processes.

Description

Technical Field

[0001] The invention relates to the technical field of analysis devices, and in particular to a portable optical cavity multi-component flue gas analysis device and method. Background Art

[0002] The gas content analyzer is a device used to measure and analyze the concentration of various gas components in a sample. It can be used to monitor the concentration of various common pollutants in the atmosphere, help evaluate environmental quality and control pollution.

[0003] There are still many inconveniences in the existing flue gas field testing technology. For example, relatively accurate analysis equipment can only analyze a single component gas, or multiple analysis equipment must be used to form a system to perform multi-component detection. Some portable analytical instruments with multi-component detection functions only detect some conventional gases and cannot reflect the overall situation of flue gas. For some on-site testing scenarios, this often leads to problems such as low work efficiency and complicated measurement operations. Summary of the invention

[0004] The first object of the present invention is to provide a portable optical cavity multi-component flue gas analysis device, which can solve the shortcomings of low analysis efficiency and complicated measurement operation in the existing flue gas field testing technology;

[0005] The second object of the present invention is to provide a portable optical cavity multi-component flue gas analysis method, which uses the portable optical cavity multi-component flue gas analysis device as described above to perform flue gas analysis.

[0006] The present invention provides a portable optical cavity multi-component flue gas analysis device, which comprises an air intake pipe, a three-way solenoid valve, a dual-channel optical cavity, a catalytic converter and an exhaust port of the device;

[0007] One end of the air intake pipe is the air intake port of the device. A three-way solenoid valve is provided on the air intake pipe, which is divided into two flow paths through the three-way solenoid valve. One flow path directly enters the dual-channel optical cavity, and the other flow path enters the dual-channel optical cavity after passing through the catalytic converter.

[0008] The dual-channel optical cavity is provided with an exhaust port of the device.

[0009] Preferably, the dual-channel optical cavity is divided into upper and lower parallel channels, and the outlet of the upper channel and the inlet of the lower channel are combined into the same channel.

[0010] Preferably, one end of the upper channel is provided with an infrared light source and an infrared filter wheel, and the other end is provided with an infrared sensor;

[0011] One end of the lower channel is provided with an ultraviolet light source and an ultraviolet filter wheel, and the other end is provided with an ultraviolet sensor.

[0012] Preferably, the infrared filter wheel and the ultraviolet filter wheel are both provided with reference filters and other measurement filters.

[0013] Preferably, the filter wheel rotates around the central axis through a mechanical linkage structure to achieve switching of filters for different measurement purposes.

[0014] Preferably, the infrared sensor and the ultraviolet sensor are both connected to a signal amplifier.

[0015] Preferably, it also includes a numerical control module;

[0016] The three-way solenoid valve, the infrared filter wheel, the ultraviolet filter wheel and the signal amplifier are all connected to the CNC module;

[0017] The opening and closing of the three-way solenoid valve, the rotation and switching of the infrared filter wheel and the ultraviolet filter wheel, and the signal transmission of the signal amplifier are all controlled and displayed by the CNC module.

[0018] Preferably, it further comprises an analysis device housing, wherein the three-way solenoid valve, dual-channel optical cavity, infrared filter wheel, ultraviolet filter wheel, signal amplifier and numerical control module are arranged in the analysis device housing.

[0019] A method for analyzing flue gas using a portable optical cavity multi-component flue gas analyzer, which uses the portable optical cavity multi-component flue gas analyzer as described above to analyze flue gas, and comprises the following steps:

[0020] After the gas enters the device from the inlet, it is divided into two flow paths through a three-way solenoid valve. One path directly enters the dual-channel optical cavity, and the other path enters the dual-channel optical cavity after passing through the catalytic converter. After the measurement is completed, it is discharged from the device outlet.

[0021] Preferably, the dual-channel optical cavity is divided into upper and lower parallel channels, the outlet of the upper channel and the inlet of the lower channel are combined into the same channel, and the gas to be measured flows through the upper and lower channels in sequence to complete the corresponding gas component measurement respectively.

[0022] Beneficial effects:

[0023] By setting up a dual-flow dual-channel optical cavity and designing different functions for each channel optical cavity, it is possible to measure multiple components of the gas to be measured, thereby improving the analysis efficiency of the equipment. The selected absorption spectroscopy method is easy to design for portability in terms of structure, and by setting different operating processes, the on-site measurement operation can be further simplified. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic structural diagram of an optical cavity portable multi-component flue gas analysis device provided in a specific embodiment of the present invention.

[0026] Description of reference numerals:

[0027] 1. Analytical device housing; 2. Three-way solenoid valve; 3. Dual-channel optical cavity; 4. Catalytic converter; 5. Infrared light source; 6. Infrared filter wheel; 7. Infrared sensor; 8. Signal amplifier; 9. Ultraviolet light source; 10. Ultraviolet filter wheel; 11. Ultraviolet sensor; 12. CNC module; 13. Device air inlet; 14. Device exhaust. DETAILED DESCRIPTION

[0028] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal connection of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] like Figure 1 As shown, this embodiment provides a portable multi-component flue gas analysis device with an optical cavity, including an analysis device housing 1, and the analysis device is connected to a flue measurement point through an air inlet 13. After the gas enters the device through the air inlet 13, it is divided into two flow paths through a three-way solenoid valve 2, one of which directly enters the dual-channel optical cavity 3, and the other enters the dual-channel optical cavity 3 after passing through a catalytic converter 4, and is discharged from the device exhaust port 14 after the measurement is completed.

[0032] By setting up a dual-flow dual-channel optical cavity and designing different functions for each channel optical cavity, it is possible to measure multiple components of the gas to be measured, thereby improving the analysis efficiency of the equipment. The selected absorption spectroscopy method is easy to design for portability in terms of structure, and by setting different operating processes, the on-site measurement operation can be further simplified.

[0033] The catalytic converter 4 can convert the VOCs in the gas to be tested into CO2.

[0034] The dual-channel optical cavity 3 is divided into upper and lower parallel channels, and the outlet of the upper channel and the inlet of the lower channel are combined into the same channel. The gas to be measured flows through the upper and lower channels in sequence, and the corresponding gas component measurements are completed respectively.

[0035] An infrared light source 5 and an infrared filter wheel 6 are provided at one end of the upper channel, and an infrared sensor 7 is provided at the other end for receiving light of a specific wavelength obtained after the infrared light source is filtered by the infrared filter wheel, so as to measure the concentration of components in the gas with infrared absorption ability, such as CO2, TVOC, etc.

[0036] An ultraviolet light source 9 and an ultraviolet filter wheel 10 are provided at one end of the lower channel, and an ultraviolet sensor 11 is provided at the other end for receiving light of a specific wavelength obtained after the ultraviolet light source is filtered by the ultraviolet filter wheel, so as to measure the concentration of components with ultraviolet absorption ability in the gas, such as NOx, O3, etc.

[0037] The infrared filter wheel 6 and the ultraviolet filter wheel 10 are both provided with reference filters and other measuring filters, and the filter wheel can realize the switching of filters through a mechanical linkage structure. The reference filter is used to remove the hardware interference of the device itself, and other measuring filters are selected and added according to the measurement requirements. The filter wheel rotates around the central axis through a mechanical linkage structure to realize the switching of filters for different measurement purposes.

[0038] The infrared sensor 7 and the ultraviolet sensor 11 are both connected to the signal amplifier 8. The sensor realizes the conversion of the photoelectric signal, and the signal amplifier further amplifies the electrical signal.

[0039] The opening and closing of the three-way solenoid valve 2 , the rotation and switching of the infrared filter wheel 6 and the ultraviolet filter wheel 10 , and the signal transmission of the signal amplifier 8 are all controlled and displayed by the numerical control module 12 .

[0040] Specifically, the opening and closing of the three-way solenoid valve, the rotation switching of the infrared filter wheel and the ultraviolet filter wheel, and the signal transmission of the signal amplifier are all controlled by the numerical control module through the written process code, and the obtained signal is processed, and the measurement results are calculated and displayed in real time. It should be noted that the process code used by the numerical control module can adopt the existing process code.

[0041] In this embodiment, a method for optical cavity portable multi-component flue gas analysis is also provided, which uses the optical cavity portable multi-component flue gas analysis device as described above to perform flue gas analysis, and includes the following steps:

[0042] After the gas enters the device from the inlet 13, it is divided into two flow paths through the three-way solenoid valve 2. One path directly enters the dual-channel optical cavity 3, and the other path enters the dual-channel optical cavity 3 after passing through the catalytic converter 4. After the measurement is completed, it is discharged from the device exhaust port 14.

[0043] In order to further illustrate the above optical cavity portable multi-component flue gas analysis device, this embodiment also provides a specific application example of the analysis device, as described below:

[0044] The analysis device 1 is connected to the flue measurement point through the device air inlet 13. To ensure the normal operation of the device, a particulate filter and a drying tube are installed in front of the air inlet. The gas to be measured enters the device and first directly enters the dual-channel optical cavity 3 through the open circuit of the three-way solenoid valve 2 for measurement. The infrared light source 5 at one end of the upper channel is in the on state, and the infrared filter wheel 6 on the same side first turns to the reference filter. The infrared sensor 7 at the other end first obtains a background light signal, which is converted into an electrical signal and then transmitted to the numerical control module 12 for storage by the signal amplifier 8. After that, the infrared filter wheel 6 rotates according to the program set by the numerical control module 12 and turns to the required measurement filter. Taking CO2 measurement as an example, the required filter is a filter that transmits 4.26um wavelength infrared light.

[0045] After the measurement of the infrared absorption gas component of the upper channel is completed, the gas to be measured enters the lower channel from the parallel connection of the upper and lower channels. Similar to the upper channel, the ultraviolet light source 9 at one end of the lower channel is in the on state, the ultraviolet filter wheel 10 on the same side first turns to the reference filter, and the ultraviolet sensor 11 at the other end first obtains a background light signal, which is converted into an electrical signal and then transmitted to the numerical control module 12 for storage by the signal amplifier 8. After that, the ultraviolet filter wheel 10 rotates according to the program set by the numerical control module 12 and turns to the required measurement filter. Taking the measurement of NOx and O3 as an example, the filter required for NO needs to transmit the characteristic wavelength light of 200nm to 235nm, NO2 needs to transmit the characteristic wavelength light of 220nm to 250nm or 350nm to 500nm, and the filter required for O3 needs to transmit the characteristic wavelength light of 253.7nm.

[0046] For the measurement of TVOC, the numerical control module 12 switches the flow path of the three-way solenoid valve 2, and the TVOC component in the gas to be measured is first converted into CO2 by the catalytic converter 4, and then sent to the dual-channel optical cavity 3 for measurement in the CO2 measurement mode. If the initial CO2 measurement concentration is c2, and the CO2 measurement concentration after the three-way solenoid valve 2 switches the flow path is c2, then the difference between the two (c2-c2) is the TVOC concentration.

[0047] The numerical control module 12 controls the operation of each device through the written process code, and at the same time processes the obtained photoelectric signal, calculates the measurement result in real time according to the Lambert-Beer law and displays it.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A portable optical cavity multi-component flue gas analysis device, characterized in that: It comprises an air intake pipe, a three-way solenoid valve (2), a dual-channel optical cavity (3), a catalytic converter (4) and an exhaust port (14) of the device; One end of the air intake pipe is an air intake port (13) of the device. A three-way solenoid valve (2) is arranged on the air intake pipe. The air intake pipe is divided into two flow paths through the three-way solenoid valve (2), one of which directly enters the dual-channel optical cavity (3), and the other enters the dual-channel optical cavity (3) after passing through the catalytic converter (4); The dual-channel optical cavity (3) is provided with a device exhaust port (14).

2. The optical cavity portable multi-component flue gas analysis device according to claim 1 is characterized in that: The dual-channel optical cavity (3) is divided into upper and lower parallel channels, and the outlet of the upper channel and the inlet of the lower channel are combined into the same channel.

3. The optical cavity portable multi-component flue gas analysis device according to claim 2 is characterized in that: One end of the upper channel is provided with an infrared light source (5) and an infrared filter wheel (6), and the other end is provided with an infrared sensor (7); One end of the lower channel is provided with an ultraviolet light source (9) and an ultraviolet filter wheel (10), and the other end is provided with an ultraviolet sensor (11).

4. The optical cavity portable multi-component flue gas analysis device according to claim 3 is characterized in that: The infrared filter wheel (6) and the ultraviolet filter wheel (10) are both provided with reference filters and other measurement filters.

5. The optical cavity portable multi-component flue gas analysis device according to claim 4 is characterized in that: The filter wheel rotates around the central axis through a mechanical linkage structure to achieve the switching of filters for different measurement purposes.

6. The optical cavity portable multi-component flue gas analysis device according to claim 3, characterized in that: The infrared sensor (7) and the ultraviolet sensor (11) are both connected to a signal amplifier (8).

7. The optical cavity portable multi-component flue gas analysis device according to claim 6, characterized in that: Also includes a numerical control module (12); The three-way solenoid valve (2), the infrared filter wheel (6), the ultraviolet filter wheel (10) and the signal amplifier (8) are all connected to the numerical control module (12); The opening and closing of the three-way electromagnetic valve (2), the rotation switching of the infrared filter wheel (6) and the ultraviolet filter wheel (10), and the signal transmission of the signal amplifier (8) are all controlled and displayed by the numerical control module (12).

8. The optical cavity portable multi-component flue gas analysis device according to claim 7, characterized in that: It also comprises an analysis device housing (1), wherein the three-way solenoid valve (2), the dual-channel optical cavity (3), the infrared filter wheel (6), the ultraviolet filter wheel (10), the signal amplifier (8) and the numerical control module (12) are arranged in the analysis device housing (1).

9. A portable optical cavity multi-component flue gas analysis method, characterized in that: Flue gas analysis is performed using the optical cavity portable multi-component flue gas analysis device as described in any one of claims 1 to 8, which comprises the following steps: After the gas enters the device from the inlet (13), it is divided into two flow paths through the three-way solenoid valve (2), one path directly enters the dual-channel optical cavity (3), and the other path enters the dual-channel optical cavity (3) after passing through the catalytic converter (4), and is discharged from the device outlet (14) after the measurement is completed.

10. The optical cavity portable multi-component flue gas analysis method according to claim 9, characterized in that: The dual-channel optical cavity is divided into upper and lower parallel channels. The outlet of the upper channel and the inlet of the lower channel are merged into the same channel. The gas to be measured flows through the upper and lower channels in turn to complete the corresponding gas component measurement respectively.

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