CN213544382U - Sampling type online methane detection device based on tunable laser absorption spectrum technology - Google Patents
Sampling type online methane detection device based on tunable laser absorption spectrum technology Download PDFInfo
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- CN213544382U CN213544382U CN202021354359.6U CN202021354359U CN213544382U CN 213544382 U CN213544382 U CN 213544382U CN 202021354359 U CN202021354359 U CN 202021354359U CN 213544382 U CN213544382 U CN 213544382U
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Abstract
The utility model provides a sampling type online methane detection device based on tunable laser absorption spectrum technology, which comprises a box body and a gas tank, wherein the gas tank is provided with a gas inlet, a gas outlet and an optical window; the detection light emitted by the laser comprises wavelengths corresponding to absorption lines of various gas components in the biogas, and the detection light penetrates through the optical window; the detector receives detection light acted with a plurality of gas components in the gas cell; the input end of the power filter is suitable for being communicated with commercial power, and the output end of the power filter is connected with the transformer; the output end of the transformer is connected with the laser and the detector; the air inlet joint and the air outlet joint are arranged on the side wall of the box body; the air inlet pipeline is used for communicating the air inlet joint with the gas inlet, and the exhaust pipeline is used for communicating the exhaust joint with the gas outlet. The utility model has the advantages of the precision is high, stability is good, weak point consuming time.
Description
Technical Field
The utility model relates to a gas analysis, in particular to sampling formula marsh gas on-line measuring device based on tunable laser absorption spectrum technique.
Background
Biogas is used as a special clean energy source, is a combustible gas generated by the fermentation of microorganisms, and belongs to a secondary energy source. The biogas is an important component and a key link for energy conservation and emission reduction, and plays a great role in coping with climate change, developing low-carbon economy and promoting construction. The main component of the marsh gas contains CH4、CO2、H2S and O2When the gas is equal, the current common method for online analysis of the methane is measuring CH by using a non-dispersive infrared (NDIR) technology4、CO2Electrochemical detector measuring H2S and O2. Non-dispersive infrared (NDIR) technology employs a broad spectrum light source, the measurement is susceptible to cross interference from background gases, and electrochemical detector technology employs direct measurement, which is susceptible to poisoning and damage.
SUMMERY OF THE UTILITY MODEL
For solving not enough among the above-mentioned prior art scheme, the utility model provides a detect sampling formula marsh gas on-line measuring device based on tunable laser absorption spectrum technique that the precision is high, weak point consuming time, low power dissipation, security are good.
The utility model aims at realizing through the following technical scheme:
the sampling type online methane detection device based on the tunable laser absorption spectrum technology comprises a box body and a gas pool, wherein the gas pool is provided with a gas inlet, a gas outlet and an optical window; the online methane detection device further comprises:
the detection light emitted by the laser comprises wavelengths corresponding to absorption spectral lines of various gas components in the biogas, and the detection light penetrates through the optical window;
a detector that receives detection light after interaction with a plurality of gas components in the gas cell;
the input end of the power filter is suitable for being communicated with commercial power, and the output end of the power filter is connected with the transformer;
the output end of the transformer is connected with the laser and the detector;
the air inlet joint and the air outlet joint are arranged on the side wall of the box body;
the gas inlet pipeline is used for communicating the gas inlet joint with the gas inlet, and the gas outlet pipeline is used for communicating the gas outlet joint with the gas outlet;
the laser, the detector, the power filter, the transformer, the air inlet pipeline and the exhaust pipeline are arranged in the box body.
Compared with the prior art, the utility model discloses the beneficial effect who has does:
1. the detection precision is high, the time consumption is short, and the power consumption is low;
simultaneous measurement of CH in biogas using tunable semiconductor laser absorption spectroscopy4、CO2、H2S and O2When gas components are equal, only the measured gas absorption spectrum line and a non-contact measurement mode are scanned by adopting single-line spectrum absorption, and the method has the advantages of high measurement precision, short time consumption, low power consumption, good stability, high reliability, long service life and the like;
2. manual sampling is not needed;
aiming at the characteristics of a biogas detection site, sampling type detection is designed, manual sampling is not needed, and real-time monitoring can be realized;
3. the safety performance is good;
the positive pressure gas (inert gas such as nitrogen, helium and the like) in the box body is filled, and the pressure in the box body is fed back in real time through the pressure sensor, so that positive pressure explosion prevention is realized, and the safety performance is improved.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only intended to illustrate the technical solution of the present invention and are not intended to limit the scope of the present invention. In the figure:
FIG. 1 is a schematic structural diagram of a methane on-line detection device according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a detection unit according to an embodiment of the present invention.
Detailed Description
Fig. 1-2 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. For the purpose of teaching the present invention, some conventional aspects have been simplified or omitted. Those skilled in the art will appreciate variations or substitutions from these embodiments that will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Accordingly, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
fig. 1 schematically shows a schematic structural diagram of a sampling type online methane detection device based on a tunable laser absorption spectroscopy technology according to an embodiment of the present invention, as shown in fig. 1, the online methane detection device includes:
a case 11 for accommodating various devices therein;
the input end of the power supply filter 1 is suitable for being communicated with commercial power, and the output end of the power supply filter 1 is connected with the transformer 2;
the output end of the transformer 2 is connected with the laser and the detector;
an air inlet joint 41 and an air outlet joint 42, wherein the air inlet joint 41 and the air outlet joint 42 are arranged on the side wall of the box body 11;
detecting element 6, fig. 2 shows schematically the structure sketch of the detecting element of the embodiment of the present invention, as shown in fig. 2, the detecting element includes:
a gas cell 60, said gas cell 60 having a gas inlet, a gas outlet and an optical window; the sampled gas enters the gas cell 60 through the gas inlet and is discharged from the gas outlet;
lasers 61-64, e.g. multiple lasers with different output wavelengths or a single laser with a broad spectrum wavelength outputThe detection light emitted by the laser comprises a plurality of gas components in the biogas (such as CH in the biogas)4、CO2、H2S and O2) The detection light is transmitted through the optical window;
detectors 66-69, the detectors 66-69 receiving the detection light after interaction with the plurality of gas components in the gas cell 60, that is, the detection light after selective absorption by the plurality of gas components, the intensity of the light received by the detectors 66-69 being attenuated at the wavelength corresponding to the absorption line compared with the intensity of the light emitted by the lasers 61-64;
an air inlet pipe 31 and an air outlet pipe 32, wherein the air inlet pipe 31 is used for communicating the air inlet joint 41 with the air inlet, and the air outlet pipe 32 is used for communicating the air outlet joint 42 with the air outlet;
the analysis unit 7, the analysis unit 7 is prior art in the field.
In order to reduce the cost of the laser, further, the laser comprises 4 tunable semiconductor lasers, which respectively correspond to CH4、CO2、H2S and O2Correspondingly, the first side wall of the gas cell is provided with optical windows with the same quantity as the plurality of gas components, and the detection light with different wavelengths emitted by the laser respectively passes through the optical windows.
In order to realize the through type light path structure, the second side wall is provided with optical windows with the same quantity as the plurality of gas components, and the optical windows are suitable for detecting light with different wavelengths after the action of the plurality of gas components in the gas cell to respectively penetrate and emit out of the gas cell; the first side wall and the second side wall are arranged oppositely.
In order to visually display the contents of a plurality of gas components in the obtained biogas in real time, further, the online biogas detection device further comprises:
and the display module 8 is arranged on the box body and used for displaying the obtained information of the multiple gas components.
In order to improve the safety, further, the online methane detection device further comprises:
the gas connector 51 is arranged on the side wall of the box body 11, and is suitable for introducing gas, such as inert gas higher than the atmospheric pressure, such as nitrogen, helium and the like, into the box body 11, so that positive pressure explosion prevention is realized;
the pressure sensor 52 is used for detecting the pressure in the box body 11, so that corresponding measures are carried out according to the obtained pressure value, if the obtained pressure value is lower than the atmospheric pressure, the air needs to be filled into the box body, and the pressure in the box body is higher than the atmospheric pressure; if the pressure value is obtained to be higher than the atmospheric pressure, no inflation is needed.
Example 2:
according to the utility model discloses marsh gas on-line measuring device's based on sampling application example 1.
In this application example, as shown in fig. 1-2, four VECSEL semiconductor lasers are used as the lasers 61-64, and the output wavelengths correspond to CH, respectively4、CO2、H2S and O2Absorption lines of (d); the power filter 1 is connected with commercial power and used for shielding interference signals; the transformer 2 reduces the voltage value to provide 24V direct current voltage for the lasers 61-64, the detectors 66-69, the analysis unit 7 and the like; the first side wall of the gas cell 60 has four optical windows adapted to transmit the corresponding CH, respectively4、CO2、H2S and O2Correspondingly, the second side wall has four optical windows adapted to respectively transmit the corresponding CH4、CO2、H2S and O2Such that the detection light emitted by the lasers 60-64 is selectively absorbed by the gas in the gas cell after passing through the optical window of the first sidewall, and then passes through the optical window of the second sidewall to be received by the detectors 66-69;
the air inlet joint 41 and the air outlet joint 42 are arranged on the side wall of the box body 11 and are suitable for conveniently introducing sampling gas and discharging the detected sampling gas; the air inlet pipe 31 is used for communicating the air inlet joint 41 with the air inlet, and the air outlet pipe 32 is used for communicating the air outlet joint 42 with the air outlet;
the gas connector 51 is arranged on the side wall of the box body 11, and is suitable for introducing gas into the box body 11, in the embodiment, the gas connector 51 is pure nitrogen with the pressure higher than the atmospheric pressure, and the box body 11 does not contain flammable and explosive gases such as methane and the like, so that positive pressure explosion prevention is realized;
a pressure sensor 52, wherein the pressure sensor 52 detects the pressure in the box body 11, so that the corresponding measures are carried out according to the obtained pressure value: if the obtained pressure value is lower than the atmospheric pressure, the box body needs to be inflated, so that the pressure in the box body is higher than the atmospheric pressure; if the pressure value is obtained to be higher than the atmospheric pressure, no inflation is needed.
Example 3:
according to the utility model discloses embodiment 1's marsh gas on-line measuring device based on sampling's application example, the difference with embodiment 2 is:
the second side wall is not provided with an optical window, but the inner wall of the second side wall is provided with a reflector, so that the detection light entering the gas cell from the optical window on the first side wall passes through the optical window on the first side wall again after being reflected by the reflector, namely, a return type light path structure is adopted.
Claims (7)
1. The sampling type online methane detection device based on the tunable laser absorption spectrum technology comprises a box body and a gas pool, wherein the gas pool is provided with a gas inlet, a gas outlet and an optical window; the method is characterized in that: the online methane detection device further comprises:
the detection light emitted by the laser comprises wavelengths corresponding to absorption spectral lines of various gas components in the biogas, and the detection light penetrates through the optical window;
a detector that receives detection light after interaction with a plurality of gas components in the gas cell;
the input end of the power filter is suitable for being communicated with commercial power, and the output end of the power filter is connected with the transformer;
the output end of the transformer is connected with the laser and the detector;
the air inlet joint and the air outlet joint are arranged on the side wall of the box body;
the gas inlet pipeline is used for communicating the gas inlet joint with the gas inlet, and the gas outlet pipeline is used for communicating the gas outlet joint with the gas outlet;
the laser, the detector, the power filter, the transformer, the air inlet pipeline and the exhaust pipeline are arranged in the box body.
2. The sampling type online biogas detection device based on the tunable laser absorption spectroscopy technology as claimed in claim 1, wherein: the gas component is CH4、CO2、H2S and O2。
3. The sampling type online biogas detection device based on the tunable laser absorption spectroscopy technology as claimed in claim 2, wherein: the laser comprises 4 tunable semiconductor lasers respectively corresponding to CH4、CO2、H2S and O2Detection of (3).
4. The sampling type online biogas detection device based on the tunable laser absorption spectroscopy technology as claimed in claim 1, wherein: the first side wall of the gas cell is provided with optical windows which are as many as the gas components and are suitable for detection light with different wavelengths emitted by the laser to respectively pass through.
5. The sampling type online biogas detection device based on the tunable laser absorption spectroscopy technology as claimed in claim 4, wherein: the second side wall of the gas cell is provided with optical windows with the same quantity as the plurality of gas components, and the optical windows are suitable for detecting light with different wavelengths after the gas cell reacts with the plurality of gas components to respectively penetrate through the gas cell and then to be emitted out of the gas cell; the first side wall and the second side wall are arranged oppositely.
6. The sampling type online biogas detection device based on the tunable laser absorption spectroscopy technology as claimed in claim 1, wherein: the online methane detection device further comprises:
and the display module is arranged on the box body and used for displaying the obtained information of the multiple gas components.
7. The sampling type online biogas detection device based on the tunable laser absorption spectroscopy technology as claimed in claim 1, wherein: the online methane detection device further comprises:
the gas joint is arranged on the side wall of the box body and is suitable for introducing gas into the box body;
a pressure sensor that detects a pressure within the tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021354359.6U CN213544382U (en) | 2020-07-11 | 2020-07-11 | Sampling type online methane detection device based on tunable laser absorption spectrum technology |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021354359.6U CN213544382U (en) | 2020-07-11 | 2020-07-11 | Sampling type online methane detection device based on tunable laser absorption spectrum technology |
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| CN213544382U true CN213544382U (en) | 2021-06-25 |
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| CN202021354359.6U Active CN213544382U (en) | 2020-07-11 | 2020-07-11 | Sampling type online methane detection device based on tunable laser absorption spectrum technology |
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