CN210923462U - Gas concentration detection device based on NDUV technology - Google Patents
Gas concentration detection device based on NDUV technology Download PDFInfo
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- CN210923462U CN210923462U CN201921479715.4U CN201921479715U CN210923462U CN 210923462 U CN210923462 U CN 210923462U CN 201921479715 U CN201921479715 U CN 201921479715U CN 210923462 U CN210923462 U CN 210923462U
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Abstract
The utility model discloses a gas concentration detection device based on NDUV technology, which comprises a bottom plate, wherein a first measuring device and a second measuring device are arranged on the bottom plate side by side; a computer unit is also arranged on one side of the first measuring device on the bottom plate and is in signal connection with the first measuring device and the second measuring device; and the air inlet is communicated with the first measuring device and the second measuring device respectively through an air inlet pipeline, and the air outlet is communicated with the first measuring device and the second measuring device respectively through an air outlet pipeline. The utility model discloses based on NDUV technique, lead toThrough the design of two measuring devices, especially through the selection of a radiation source in a two-side device, the design of a measuring chamber and a detector, the SO in the mixed gas can be simultaneously and accurately detected within the range of ppm-level gas concentration2、NO2And the content of NO, the practicability and the operability are strong.
Description
Technical Field
The utility model relates to a gas monitoring equipment field especially relates to a gas concentration detection device based on NDUV technique.
Background
Combustion exhaust gas (flue gas) is generated during combustion of plant machinery. The law states that untreated combustion exhaust gases (flue gases) must not be discharged directly into the environment. In order to be able to check whether the emissions of such pollutants from the device or engine meet the legal requirements, the combustion gases should be continuously analyzed.
For sulfur dioxide (SO) in flue gas2) Nitrogen dioxide (NO)2) And Nitric Oxide (NO) measurement are one of the most important means of controlling pollutant emissions. Various measurement techniques and instruments are currently used to measure these contaminated gases.
One technique is based on the absorption of a radiating gas in the infrared range, which is mainly the cross-sensitivity of humidity in the infrared range in the gas mixture, SO that SO is present in a concentration range below 1000ppm2And NO concentration cannot be measured. In addition to this, NO can not be measured at all in the infrared region2Because in the infrared radiation range, NO2There was no significant absorption of the gas.
Another widely used technique is UVDOAS (ultraviolet differential optical absorption spectroscopy), which uses ultraviolet radiation absorption. The technology has little cross sensitivity of humidity, and can measure NO2But due to the aging of the uv light source, the unstable fiber couplers mainly used between the measurement chamber and the spectrometer need to be calibrated almost every day to ensure the stability of the signal.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the main technical problem who solves provides a gas concentration detection device based on NDUV technique, comprising a base plate, install first measuring device and second measuring device on the bottom plate side by side, wherein, first measuring device is used for detecting SO2And NO2The concentration of (c); the second measuring device is used for detecting the concentration of NO; a computer unit is further installed on the bottom plate and positioned on one side of the first measuring chamber, and the computer unit is in signal connection with the first measuring chamber and the second measuring chamber; an air inlet and an air outlet are installed at one end of the second measuring device, the air inlet is communicated with the first measuring device and the second measuring device through an air inlet pipeline respectively, and the air outlet is measured by the first measuring device and the second measuring device through an air outlet pipeline respectivelyThe metering devices are communicated.
In a preferred embodiment of the present invention, the first measuring device comprises a housing, and a first measuring chamber, at least one LED radiation source, at least one narrowband radiation source and a first detector are installed in the housing; wherein the LED radiation source and the narrowband radiation source are both located at one end of the first measurement chamber, and the first detector is located at the other end of the first measurement chamber; the first measuring chamber is communicated with the air inlet pipeline and the air outlet pipeline; the LED radiation source, the narrow-band radiation source and the first detector are respectively in signal connection with the computer unit.
In a preferred embodiment of the present invention, the beam paths of the LED radiation source, the first measurement chamber and the first detector are collinear;
the beam paths of the narrow band radiation source, the first measurement chamber and the first detector are collinear.
In a preferred embodiment of the present invention, the first measuring device further comprises a first beam splitter and a reference detector; wherein the first beam splitter is mounted in a beam path between the LED or narrowband radiation source and the first measurement chamber; the reference detector is arranged on one side of the first beam splitter and is used for receiving and detecting the electromagnetic radiation reflected by the first beam splitter; the reference detector is in signal connection with the computer unit.
In a preferred embodiment of the present invention, the second measuring device comprises a housing, in which a second measuring chamber, at least one EDL radiation source and a second detector are mounted; wherein the EDL radiation source is located on one side of the second measurement chamber and the second detector is located on the other side of the second measurement chamber; the second measuring chamber is communicated with the air inlet pipeline and the air outlet pipeline; the second detector is in signal connection with the computer unit.
In a preferred embodiment of the present invention, the beam paths of the EDL radiation source, the second measurement chamber and the second detector are collinear.
In a preferred embodiment of the present invention, the second measuring device further comprises a first band-pass filter installed in a beam path between the EDL radiation source and the second measuring chamber.
In a preferred embodiment of the present invention, the second measuring device further comprises a second beam splitter, an additional band-pass filter, and a pre-reference detector; the second beam splitter is arranged in a beam path between the first band-pass filter and the second measuring chamber, and the additional band-pass filter and the pre-reference detector are sequentially arranged on one side of the second beam splitter and used for receiving and detecting the electromagnetic radiation reflected by the second beam splitter; the pre-reference detector is in signal connection with the computer unit.
In a preferred embodiment of the present invention, the second measuring device further includes a third beam splitter, a second band-pass filter, and a back reference detector; the third beam splitter is mounted in the beam path between the second measurement chamber and the second detector; the second band-pass filter and the back reference detector are sequentially arranged on one side of the third beam splitter and are used for receiving and detecting the electromagnetic radiation reflected by the third beam splitter; the back reference detector is in signal connection with the computer unit.
In a preferred embodiment of the present invention, the gas concentration detecting device further comprises a heater and a heating controller, wherein the heater is installed on the lower surface of the base plate, the heating controller is installed on the upper surface of the base plate, and the heater is electrically connected to the heating controller.
The utility model has the advantages that: the utility model relates to a gas concentration detection device based on NDUV technique, through two measuring device's design, especially through the selection of radiation source in the device of both sides, the design of measuring room and detector, can detect out the SO in the mist simultaneously accurately in the gaseous concentration range of ppm level2、NO2And the content of NO, the practicability and the operability are strong.
Drawings
Fig. 1 is a schematic view of the working principle of a gas concentration detection device based on the NDUV technology of the present invention;
fig. 2 is a schematic top view of the gas concentration detection device according to the present invention based on the NDUV technology;
fig. 3 is a schematic bottom structure diagram of a gas concentration detection device based on the NDUV technology of the present invention;
fig. 4 is a schematic diagram of an internal structure of a first measuring device side of a gas concentration detecting device based on the NDUV technology according to the present invention;
fig. 5 is a schematic diagram of an internal structure of a second measuring device side of the gas concentration detecting device according to the present invention based on the NDUV technology;
the parts in the drawings are numbered as follows: 1. the device comprises a gas concentration detection device, 2, a first measurement device, 3, a first measurement chamber, 4, an LED radiation source, 5, a narrow-band radiation source, 6, a first detector, 7, a first beam splitter, 8, a reference detector, 9, a second measurement device, 10, a second measurement chamber, 11, an EDL radiation source, 12, a second detector, 13, a first band-pass filter, 14, a third beam splitter, 15, a second band-pass filter, 16, a rear reference detector, 18, a gas inlet, 19, a gas outlet, 20, a computer unit, 23, a bottom plate, 24, a heater and 28, and a heater controller.
Detailed Description
The following detailed description of the preferred embodiments of the present invention will be provided in conjunction with the accompanying drawings, so as to enable those skilled in the art to more easily understand the advantages and features of the present invention, and thereby define the scope of the invention more clearly and clearly.
Referring to fig. 1 and 2, an embodiment of the present invention includes:
the utility model discloses a gas concentration detection device based on NDUV technique, the device are based on NDUV technique (non-dispersion ultraviolet ray), can detect the SO in the mist simultaneously under lower cross sensitivity, lower gas concentration2、NO2And NO content.
Based on the NDUV technique, the device can measure the concentration of the gas mixture more accurately, especially in the ppm range. This is because there is no cross-sensitivity to humidity in the UV and there is a controllable radiation source and stable optical structures such as NDIR (non-dispersive infrared).
Example 1
The utility model relates to a gas concentration detection device 1 based on NDUV technique, comprising a base plate 23, install first measuring device 2 and second measuring device 9 on the bottom plate 23 side by side, wherein, first measuring device 2 is used for detecting SO2And NO2The concentration of (c); the second measuring device 9 is used for detecting the concentration of NO; a computer unit 20 is further mounted on the bottom plate 23 at one side of the first measuring device 2, and the computer unit 20 is in signal connection with the first measuring device 2 and the second measuring device 9; an air inlet 18 and an air outlet 19 are installed at one end of the second measuring device 9, the air inlet 18 is respectively communicated with the first measuring device and the second measuring device through an air inlet pipeline, and the air outlet 19 is respectively communicated with the first measuring device and the second measuring device through an air outlet pipeline; the mixed gas enters the first measuring device 2 and the second measuring device 9 in parallel.
The first measuring device 2 is designed as a photometer and comprises a housing in which a first measuring chamber 3, at least one LED radiation source 4, at least one narrow-band radiation source 5 and a first detector 6 are mounted; wherein the LED radiation source 4 and the narrowband radiation source 5 are both located at one end of the first measurement chamber 3, and the first detector 6 is located at the other end of the first measurement chamber 3; the LED radiation source 4, the narrow band radiation source 5 and the first detector 6 are each connected to the computer unit signal 20. The beam paths of the LED radiation source 4, the first measuring chamber 3 and the first detector 6 are collinear; the beam paths of the narrow band radiation source 5, the first measurement chamber 3 and the first detector 6 are collinear.
The first measuring chamber 3 is communicated with the gas inlet pipeline and the gas outlet pipeline, and mixed gas to be detected enters the first measuring chamber 3 through the gas inlet 18 and the gas inlet pipeline, flows out of the other end of the first measuring chamber 3 and is finally discharged from the gas outlet 19 through the gas outlet pipeline.
In particular, the LED radiation source 4 is a UV light emitting diode for generating light through the first measuring chamber3, the electromagnetic radiation having a wavelength corresponding to SO2The first measurement wavelength, the maximum wavelength of the particular absorption band; the narrow band radiation source 5 is arranged to generate electromagnetic radiation having a wavelength corresponding to NO through the first measurement chamber 32I.e. the second measurement wavelength. The LED radiation source 4 and the narrowband radiation source 5 are in signal connection with the computer unit 20, respectively, and perform signal alternation by the control action of the computer unit 20, thereby realizing the detection of the first measurement wavelength and the second measurement wavelength by one first detector 6.
Preferably, the first measuring device 2 further comprises a first beam splitter 7 and a reference detector 8; wherein the first beam splitter 7 is mounted in the beam path between the LED radiation source 4 or narrowband radiation source 5 and the first measurement chamber 3; the reference detector 8 is installed at one side of the first beam splitter 7 and is used for receiving and detecting the electromagnetic radiation reflected by the first beam splitter 7; the reference detector 8 is connected to the computer unit signal 20. The electromagnetic radiation generated by both the LED radiation source 4 and the narrowband radiation source 5 may enter the first beam splitter 7 and produce a signal on the reference detector 8 to compensate for any fluctuations or aging of the electromagnetic signal emitting source.
The second measuring device 9 is designed as a photometer and comprises a housing in which a second measuring chamber 10, at least one EDL radiation source 11 and a second detector 12 are mounted; wherein the EDL radiation source 11 is located at one side of the second measurement chamber 10 and the second detector 12 is located at the other side of the second measurement chamber 10; the second detector 12 is in signal connection with the computer unit 20; the beam paths of the EDL radiation source 11, the second measurement chamber 10 and the second detector 12 are collinear.
The second measuring chamber 10 is communicated with an air inlet pipeline and an air outlet pipeline, and mixed gas to be detected enters one end of the second measuring chamber 10 through the air inlet 18 and the air inlet pipeline, flows out of the other end of the second measuring chamber 10, and is finally discharged from the air outlet 19 through the air outlet pipeline.
In particular, the EDL radiation source 11 is used to generate electromagnetic radiation through the second measurement chamber 10 having a maximum wavelength corresponding to a specific absorption band of NO, i.e. a third measurement wavelength.
Preferably, the second measuring device 9 further comprises a first band-pass filter 13, the first band-pass filter 13 being mounted in the beam path between the EDL radiation source 11 and the second measuring chamber 10. This first band-pass filter 13 passes only electromagnetic radiation in the same narrow band frequency range as the maximum wavelength of the specific absorption band of NO of the electromagnetic radiation emitted by the EDL radiation source 11.
Preferably, said second measuring means 9 further comprise a second beam splitter 25, an additional band-pass filter 27 and a pre-reference detector 26; said second beam splitter 25 is arranged in the beam path between said first band-pass filter 13 and the second measuring chamber 10, said additional band-pass filter 27 and pre-reference detector 26 being arranged in turn on one side of said second beam splitter 25 for receiving and detecting the electromagnetic radiation reflected by said second beam splitter 25; the pre-reference detector 26 is in signal connection with the computer unit. Any fluctuations or aging of the electromagnetic signal emission source can be compensated for by generating a signal of the electromagnetic radiation on the pre-reference detector 26 by means of the second beam splitter 25, the additional band-pass filter 27. In addition, the additional band pass filter 27 can eliminate specific wavelengths of the gas, thereby eliminating the effect of the current gas concentration in the reference signal.
Preferably, the second measuring device 9 further comprises a third beam splitter 14, a second band-pass filter 16 and a back reference detector 15; the third beam splitter 14 is mounted in the beam path between the second measurement chamber 10 and the second detector 12; the second band-pass filter 16 and the back reference detector 15 are sequentially installed on one side of the third beam splitter 14, and are used for receiving and detecting the electromagnetic radiation reflected by the third beam splitter 14; the rear reference detector 15 is in signal connection with the computer unit 20. The measurement results of the back reference detector 15 are used to compensate for signal fluctuations of the emission source.
The lengths of the first measurement chamber 3 and the second measurement chamber 10 can be adjusted based on the range of the gas concentration to be measured.
The computer unit 20 calculates the SO from the signals of the first detector and the reference detector in the first measuring device, respectively2And NO2The content of (A); and calculating the content of NO according to signals of a second detector, a pre-reference detector and a post-reference detector in the second measuring device.
Example 2
The difference from embodiment 1 is that the gas concentration detection apparatus further includes a heater 24 and a heating controller 28, wherein the heater 24 is mounted on the lower surface of the base plate 23, the heating controller 28 is mounted on the upper surface of the base plate 23, and the heater 24 is electrically connected to the heating controller 28.
In the description of the present invention, it should be noted that the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are usually placed when used, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element to which the term refers must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The gas concentration detection device based on the NDUV technology is characterized by comprising a bottom plate, wherein a first measurement device and a second measurement device are arranged on the bottom plate side by side, and the first measurement device is used for detecting SO2And NO2The concentration of (c); the second measuring device is used for detecting the concentration of NO; the bottom plate is also provided with a computer unit which is in signal connection with the first measuring device and the second measuring device; the above-mentionedAn air inlet and an air outlet are installed at one end of the first measuring device or the second measuring device, the air inlet is communicated with the first measuring device and the second measuring device through an air inlet pipeline respectively, and the air outlet is communicated with the first measuring device and the second measuring device through an air outlet pipeline respectively.
2. The NDUV technology-based gas concentration detection apparatus according to claim 1, wherein the first measurement device comprises a housing in which a first measurement chamber, at least one LED radiation source, at least one narrow band radiation source and a first detector are mounted; wherein the LED radiation source and the narrowband radiation source are both located at one end of the first measurement chamber, and the first detector is located at the other end of the first measurement chamber; the first measuring chamber is communicated with the air inlet pipeline and the air outlet pipeline; the LED radiation source, the narrow-band radiation source and the first detector are respectively in signal connection with the computer unit.
3. The NDUV technology-based gas concentration detection apparatus according to claim 2, wherein beam paths of the LED radiation source, the first measurement chamber and the first detector are collinear; the beam paths of the narrow band radiation source, the first measurement chamber and the first detector are collinear.
4. The NDUV technology-based gas concentration detection apparatus according to claim 3, wherein the first measurement device further comprises a first beam splitter and a reference detector; wherein the first beam splitter is mounted in a beam path between the LED or narrowband radiation source and the first measurement chamber; the reference detector is arranged on one side of the first beam splitter and is used for receiving and detecting the electromagnetic radiation reflected by the first beam splitter; the reference detector is in signal connection with the computer unit.
5. The NDUV technology-based gas concentration detection apparatus according to claim 1, wherein the second measurement device comprises a housing in which a second measurement chamber, at least one EDL radiation source and a second detector are mounted; wherein the EDL radiation source is located on one side of the second measurement chamber and the second detector is located on the other side of the second measurement chamber; the second measuring chamber is communicated with the air inlet pipeline and the air outlet pipeline; the second detector is in signal connection with the computer unit.
6. The NDUV technology-based gas concentration detection apparatus according to claim 5, wherein beam paths of the EDL radiation source, the second measurement chamber and the second detector are collinear.
7. The NDUV technology-based gas concentration detection apparatus of claim 6, wherein the second measurement device further comprises a first band-pass filter installed in a beam path between the EDL radiation source and the second measurement chamber.
8. The NDUV technology-based gas concentration detection apparatus according to claim 7, wherein the second measurement device further comprises a second beam splitter, an additional band-pass filter, and a pre-reference detector; the second beam splitter is arranged in a beam path between the first band-pass filter and the second measuring chamber, and the additional band-pass filter and the pre-reference detector are sequentially arranged on one side of the second beam splitter and used for receiving and detecting the electromagnetic radiation reflected by the second beam splitter; the pre-reference detector is in signal connection with the computer unit.
9. The NDUV technology-based gas concentration detection apparatus according to claim 8, wherein the second measurement device further comprises a third beam splitter, a second band-pass filter, and a back reference detector; the third beam splitter is mounted in the beam path between the second measurement chamber and the second detector; the second band-pass filter and the back reference detector are sequentially arranged on one side of the third beam splitter and are used for receiving and detecting the electromagnetic radiation reflected by the third beam splitter; the back reference detector is in signal connection with the computer unit.
10. The NDUV technology-based gas concentration detection apparatus according to any of claims 1-9, further comprising a heater and a heating controller, wherein the heater is mounted on a lower surface of the base plate, the heating controller is mounted on an upper surface of the base plate, and the heater is electrically connected to the heating controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921479715.4U CN210923462U (en) | 2019-09-06 | 2019-09-06 | Gas concentration detection device based on NDUV technology |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921479715.4U CN210923462U (en) | 2019-09-06 | 2019-09-06 | Gas concentration detection device based on NDUV technology |
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| Publication Number | Publication Date |
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| CN210923462U true CN210923462U (en) | 2020-07-03 |
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| CN201921479715.4U Active CN210923462U (en) | 2019-09-06 | 2019-09-06 | Gas concentration detection device based on NDUV technology |
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| CN (1) | CN210923462U (en) |
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- 2019-09-06 CN CN201921479715.4U patent/CN210923462U/en active Active
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