CN113933250A - Gas detection device, gas detection method and computer equipment - Google Patents
Gas detection device, gas detection method and computer equipment Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 73
- 239000007789 gas Substances 0.000 claims abstract description 293
- 239000011261 inert gas Substances 0.000 claims abstract description 80
- 231100001261 hazardous Toxicity 0.000 claims description 121
- 230000003595 spectral effect Effects 0.000 claims description 78
- 238000001228 spectrum Methods 0.000 claims description 73
- 238000009792 diffusion process Methods 0.000 claims description 38
- 238000010521 absorption reaction Methods 0.000 claims description 22
- 238000000034 method Methods 0.000 claims description 21
- 238000004590 computer program Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 238000004880 explosion Methods 0.000 abstract description 8
- 239000001257 hydrogen Substances 0.000 description 29
- 229910052739 hydrogen Inorganic materials 0.000 description 29
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 26
- 239000003570 air Substances 0.000 description 13
- 239000001307 helium Substances 0.000 description 8
- 229910052734 helium Inorganic materials 0.000 description 8
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 8
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- 238000004891 communication Methods 0.000 description 5
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- 150000002431 hydrogen Chemical class 0.000 description 3
- 238000013178 mathematical model Methods 0.000 description 3
- 238000000329 molecular dynamics simulation Methods 0.000 description 3
- 238000004867 photoacoustic spectroscopy Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000002360 explosive Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000005693 optoelectronics Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000000862 absorption spectrum Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
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- 239000004973 liquid crystal related substance Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/1702—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids
- G01N2021/1704—Systems in which incident light is modified in accordance with the properties of the material investigated with opto-acoustic detection, e.g. for gases or analysing solids in gases
Abstract
The application relates to a gas detection device, a gas detection method and computer equipment, wherein the gas detection device is arranged for a dangerous gas container, the gas detection device comprises a photoacoustic cell, an inert gas container and a dangerous gas detection module, the photoacoustic cell is connected with the dangerous gas container, when the dangerous gas container generates gas leakage, the photoacoustic cell contains the leaked dangerous gas, a first valve of the dangerous gas container is closed, a second valve of the inert gas container is opened, the inert gas is utilized to dilute the dangerous gas in the photoacoustic cell, so that the concentration of the dangerous gas in the photoacoustic cell is reduced until the photoacoustic reaches a concentration safety threshold value, and explosion dangerous accidents are avoided.
Description
Technical Field
The present application relates to the field of gas detection technologies, and in particular, to a gas detection device, a gas detection method, and a computer apparatus.
Background
Hydrogen energy is a new green, efficient and sustainable clean energy, and has a wide application in the present society, such as: however, hydrogen also has great danger, the explosion limit of hydrogen in air is very wide (volume fraction is 4% -75%), and explosion accidents are easy to happen when exposed to fire. Since hydrogen has the smallest molecular weight and the smallest viscosity, liquid hydrogen and gaseous hydrogen in the air are easy to diffuse, and therefore the liquid hydrogen leaks into an unventilated environment, and the ambient air can be quickly diluted.
The data show that liquid hydrogen per unit volume increases 840 times in volume when vaporized to gaseous hydrogen at ambient temperature and pressure, and 21000 times if it forms a 4% lower explosive limit gas mixture with air. Such mixtures are at risk of explosion upon exposure to an open flame, and therefore a means of hydrogen monitoring is highly desirable to reduce the occurrence of hazardous events.
Disclosure of Invention
Therefore, it is necessary to provide a gas detection method, a gas detection device, a computer device, and a storage medium, which can improve the accuracy of hydrogen detection results and reduce the occurrence probability of dangerous events.
A gas detection device for use with a hazardous gas container having a first valve thereon, the detection device comprising:
the photoacoustic cell is connected with the dangerous gas container through the first valve and is used for containing dangerous gas leaked from the dangerous gas container;
an inert gas container having a second valve connected to the hazardous gas container through the second valve for storing inert gas;
and the dangerous gas detection module is used for sending a closing signal to the first valve and sending an opening signal to the second valve when dangerous gas is detected to exist in the photoacoustic cell, so that the inert gas container outputs the inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas.
In one embodiment, the hazardous gas detection module is further configured to acquire first spectral data and second spectral data, and when the second spectral data is detected to be different from the first spectral data, determine that the hazardous gas container leaks the hazardous gas into the photoacoustic cell;
wherein the first spectrum data is absorption peak spectrum data when the hazardous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the hazardous gas is leaked from the hazardous gas container.
In one embodiment, the apparatus further comprises:
the variable frequency laser is used for providing laser with different frequencies to irradiate mixed gas in the photoacoustic cell, and the mixed gas comprises the dangerous gas and the inert gas;
the microphone is arranged on the photoacoustic cell and used for detecting a pressure fluctuation signal;
the lock-in amplifier is connected with the output end of the microphone and is used for converting the pressure fluctuation signal into a photoelectric signal;
and the second spectrum acquisition module is used for analyzing the photoelectric signal to obtain second spectrum data.
In one embodiment, the apparatus further comprises:
and the frequency adjusting module is used for adjusting the frequency of the frequency conversion laser according to the second spectrum data.
In one embodiment, the apparatus further comprises:
the gas concentration detection module is used for acquiring a plurality of third spectral data and the second spectral data and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of the third spectral data and the second spectral data;
the third spectral data are spectral data obtained by performing spectral acquisition on a plurality of dangerous gases with different concentrations.
In one embodiment, the gas concentration detection module is further configured to send an exhaust signal to an exhaust valve of the photoacoustic cell when the concentration of the hazardous gas in the photoacoustic cell reaches a concentration safety threshold, so that the photoacoustic cell opens the exhaust valve to exhaust the mixed gas having the concentration reaching the concentration safety threshold through the exhaust valve.
In one embodiment, the apparatus further comprises:
the temperature and pressure sensor is arranged in the photoacoustic cell and used for acquiring pressure data and temperature data in the photoacoustic cell;
and the diffusion coefficient determining module is used for determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
In one embodiment, the diffusion coefficient is calculated using the following formula:
wherein D isABRepresenting a diffusion coefficient of a mixed gas within the photoacoustic cell; t is the temperature in the photoacoustic cell, PGeneral assemblyIs the total pressure within the photoacoustic cell; mA、MBRespectively the molecular weight of the hazardous gas and the inert gas; v. ofA、vBRespectively, the molecular diffusion volumes of the hazardous gas and the inert gas.
A gas detection method for use with a hazardous gas container having a first valve thereon, the detection method comprising:
when dangerous gas exists in the photoacoustic cell, sending a closing signal to a first valve of the dangerous gas container and sending an opening signal to a second valve of an inert gas container, so that the inert gas container outputs inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas;
wherein the photoacoustic cell is connected with the hazardous gas container through the first valve and is used for containing hazardous gas leaked from the hazardous gas container; the inert gas container is connected with the dangerous gas container through the second valve and is used for storing inert gas.
In one embodiment, the detection mode of the hazardous gas includes:
acquiring first spectral data and second spectral data;
when the second spectrum data is different from the first spectrum data, judging that the dangerous gas is leaked into the photoacoustic cell from the dangerous gas container;
wherein the first spectrum data is absorption peak spectrum data when the hazardous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the hazardous gas is leaked from the hazardous gas container.
In one embodiment, the method further comprises:
acquiring a plurality of third spectral data and second spectral data, wherein the third spectral data are spectral data obtained by performing spectral acquisition on a plurality of dangerous gases with different concentrations, and the second spectral data are absorption peak spectral data in the photoacoustic cell when the dangerous gas container leaks the dangerous gases;
and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of each third spectral data and the second spectral data.
In one embodiment, the method further comprises:
acquiring pressure data and temperature data in the photoacoustic cell;
and determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
In one embodiment, the diffusion coefficient is calculated using the following formula:
wherein D isABRepresenting a diffusion coefficient of a mixed gas within the photoacoustic cell; t is the temperature in the photoacoustic cell, PGeneral assemblyIs the total pressure within the photoacoustic cell; mA、MBRespectively the molecular weight of the hazardous gas and the inert gas; v. ofA、vBRespectively, the molecular diffusion volumes of the hazardous gas and the inert gas.
A computer device comprising a memory storing a computer program and a processor implementing the steps of the method described above when executing the computer program.
Above-mentioned gaseous detection device, gaseous detection method and computer equipment set up gaseous detection device for the hazardous gas container, gaseous detection device includes optoacoustic cell, inert gas container and hazardous gas detection module, and the optoacoustic cell is connected with the hazardous gas container, and when the hazardous gas container takes place gaseous the revealing, the optoacoustic cell holds the hazardous gas who reveals to close the first valve of hazardous gas container and open the second valve of inert gas container, utilize inert gas to dilute the hazardous gas in the optoacoustic cell, in order to reduce the concentration of hazardous gas in the optoacoustic cell, until reaching concentration safety threshold, avoid the emergence of explosion hazard accident.
Drawings
FIG. 1 is a block diagram showing the structure of a gas detection apparatus according to an embodiment;
FIG. 2 is a block diagram showing the structure of a gas detection apparatus according to an embodiment;
FIG. 3 is a block diagram showing the structure of a gas detection apparatus according to an embodiment;
FIG. 4 is a block diagram showing the structure of a gas detection apparatus according to an embodiment;
FIG. 5 is a schematic flow chart of a gas detection method according to an embodiment;
FIG. 6 is a diagram illustrating an internal structure of a computer device according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In one embodiment, as shown in fig. 1, a gas detection apparatus is provided for use with a hazardous gas container 102 having a first valve 112, the detection apparatus comprising a photoacoustic cell 104, an inert gas container 106, and a hazardous gas detection module 108.
Specifically, the photoacoustic cell 104 is connected to the hazardous gas container 102 through a first valve 112, and when the hazardous gas in the hazardous gas container 102 leaks, the photoacoustic cell 104 is used to contain the hazardous gas leaking from the hazardous gas container 102. The inert gas container 106 has a second valve 110, the inert gas container 106 is connected to the hazardous gas container 102 via the second valve 110, and the inert gas container 106 is used for storing inert gas. An inert gas may be input to photoacoustic cell 104 through second valve 110, and the inert gas may dilute the hazardous gas contained in photoacoustic cell 104.
When the dangerous gas is detected in the photoacoustic cell, the dangerous gas detection module 108 sends a closing signal to the first valve 112, the first valve 112 is closed, and the dangerous gas container 102 stops delivering the dangerous gas. The hazardous gas detection module 108 sends an opening signal to the second valve 110, the second valve 110 is opened, the inert gas container 106 outputs inert gas to the photoacoustic cell 104, and the hazardous gas in the photoacoustic cell 104 is diluted by the inert gas.
In one embodiment, the hazardous gas may be an explosive gas such as hydrogen and the inert gas may be helium. The diffusion rate of helium is relatively high, and leaked hydrogen is diluted by using helium until the explosion lower limit of the hydrogen is reached.
Among the above-mentioned gaseous detection device, set up gaseous detection device for the hazardous gas container, gaseous detection device includes the optoacoustic pond, inert gas container and hazardous gas detection module, the optoacoustic pond is connected with the hazardous gas container, when the hazardous gas container takes place gaseous the revealing, the optoacoustic pond holds the hazardous gas who reveals, and close the first valve of hazardous gas container and open the second valve of inert gas container, utilize the hazardous gas in the inert gas dilutes the optoacoustic pond, with the concentration that reduces the hazardous gas in the optoacoustic pond, until reaching concentration safety threshold, avoid the emergence of explosion hazard accident.
In one embodiment, the hazardous gas detection module is further configured to acquire the first spectral data and the second spectral data, and determine that the hazardous gas container leaks the hazardous gas into the photoacoustic cell when the second spectral data is detected to be different from the first spectral data.
The first spectrum data is absorption peak spectrum data when no dangerous gas exists in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when dangerous gas leaks from the dangerous gas container.
Specifically, when no hazardous gas exists in the photoacoustic cell, absorption peak spectrum data in the photoacoustic cell is collected and recorded as first spectrum data. When the dangerous gas is output from the dangerous gas container through the photoacoustic cell, the gas in the photoacoustic cell can be air if no leakage occurs. If leakage occurs, dangerous gas exists in the photoacoustic cell, and the gas in the photoacoustic cell can be mixed gas of air and the dangerous gas. The gas composition in the photoacoustic cell changes, and the absorption peak spectrum data in the photoacoustic cell also changes. In the process that the dangerous gas container outputs the dangerous gas through the photoacoustic cell, the gas in the photoacoustic cell can be subjected to spectrum acquisition to obtain second spectrum data. The hazardous gas detection module can acquire first spectral data in advance, compares first spectral data with second spectral data, and when detecting that second spectral data is different from first spectral data, it has hazardous gas in addition to the air in the photoacoustic cell to show, can judge that hazardous gas is revealed to the hazardous gas container in photoacoustic cell.
In this embodiment, pass through the in-process that the optoacoustic cell exported hazardous gas at the hazardous gas container, acquire second spectral data to use first spectral data as the reference, judge whether the gas composition in the optoacoustic cell changes, if both are different, then can the rapid determination reveal hazardous gas, thereby in time close first valve and open the second valve in order to dilute hazardous gas, furtherly can realize sensitive the measuring to the hazardous gas who leaks through hazardous gas detection module.
In one embodiment, as shown in FIG. 2, the apparatus further comprises a frequency-converting laser 202, a microphone 204, a lock-in amplifier 206, and a second spectrum acquisition module 208. Specifically, the frequency conversion laser 202 is used to provide laser light with different frequencies to irradiate the mixed gas in the photoacoustic cell, and the laser light wave can be enhanced after passing through the focusing lens 210. The mixed gas includes a hazardous gas and an inert gas. A microphone 204 is mounted on photoacoustic cell 104, and microphone 204 is used to detect the pressure fluctuation signal. A lock-in amplifier 206 is connected to the output of the microphone 204, and the lock-in amplifier 206 is used to convert the pressure fluctuation signal into an optical-electrical signal. The second spectrum acquiring module 208 is configured to analyze the optoelectronic signal to obtain second spectrum data.
In some embodiments, the first atlas data is generated in a manner comprising: the frequency-varying laser 202 is also used to provide laser light at different frequencies that illuminate the air within the photoacoustic cell. While the microphone 204 senses the pressure fluctuation signal. The lock-in amplifier 206 is connected to an output end of the microphone 204, and the lock-in amplifier 206 converts a pressure fluctuation signal detected by the microphone 204 into a photoelectric signal corresponding to air, and analyzes the photoelectric signal corresponding to air to obtain first spectrum data.
In this embodiment, realize the measuring of hazardous gas concentration through optoacoustic spectroscopy technique, real-time detection second spectral data can in time discover that hazardous gas reveals, avoids discovering the hysteresis quality that hazardous gas revealed.
In one embodiment, the apparatus further comprises: and the frequency adjusting module is used for adjusting the frequency of the frequency conversion laser according to the second spectrum data.
Specifically, the corresponding relation between the laser output frequency and the hazardous gas concentration is stored in advance, when the mixed gas in the photoacoustic cell is irradiated by laser, the hazardous gas concentration is determined according to the second spectrum data, the corresponding relation between the laser output frequency and the hazardous gas concentration according to the hazardous gas concentration is searched, the output frequency corresponding to the hazardous gas concentration is determined, and therefore the frequency of the frequency conversion laser is adjusted through the second spectrum data of the frequency adjusting module. So as to improve the quality of the atlas and ensure the accuracy of the detection result.
In one embodiment, the apparatus further comprises: the gas concentration detection module is used for acquiring a plurality of third spectrum data and second spectrum data and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of each third spectrum data and the second spectrum data;
the third spectral data is spectral data obtained by performing spectral acquisition on a plurality of dangerous gases with different concentrations. Specifically, a photoacoustic spectroscopy technology may be adopted to perform spectrum collection in advance for a plurality of dangerous gases with different concentrations, so as to obtain a plurality of third spectrum data. Each concentration corresponds to a respective third spectral data. The variable frequency laser 202 supplies laser light of different frequencies to irradiate the mixed gas in the photoacoustic cell. The mixed gas may include air, hazardous gases, and inert gases. The microphone 204 is used to detect the pressure fluctuation signal. A lock-in amplifier 206 is connected to the output of the microphone 204, and the lock-in amplifier 206 is used to convert the pressure fluctuation signal into an optical-electrical signal. The second spectrum acquiring module 208 is configured to analyze the optoelectronic signal to obtain second spectrum data. The gas concentration detection module acquires a plurality of third spectrum data and second spectrum data, compares the second spectrum data with the plurality of third spectrum data, and acquires the concentration corresponding to the third spectrum data when the second spectrum data is matched with any third spectrum data, namely the concentration of the dangerous gas in the photoacoustic cell.
In the embodiment, the concentration of the hazardous gas is detected by the photoacoustic spectroscopy technology, complex devices and operations are not needed, the concentration of the hazardous gas can be detected in time, and reference data is provided for adopting an emergency risk avoiding means.
In one embodiment, the gas concentration detection module is further configured to send an exhaust signal to an exhaust valve of the photoacoustic cell when the concentration of the hazardous gas in the photoacoustic cell reaches a concentration safety threshold, so that the photoacoustic cell opens the exhaust valve to exhaust the mixed gas with the concentration reaching the concentration safety threshold through the exhaust valve. The concentration safety threshold can be determined in combination with the actual situation, such as the type of dangerous gas, the type of inert gas, etc.
In this embodiment, through the concentration that detects hazardous gas, in time learn whether the concentration of hazardous gas reaches concentration safe threshold in the photoacoustic cell, if reach concentration safe threshold, in time discharge hazardous gas through the air discharge valve, eliminate the potential safety hazard.
In one embodiment, as shown in FIG. 3, the apparatus further includes a temperature pressure sensor 302 and a diffusion coefficient determination module. Specifically, a temperature-pressure sensor 302 is disposed within photoacoustic cell 104, and temperature-pressure sensor 302 is used to acquire pressure data and temperature data within photoacoustic cell 104. And the diffusion coefficient determining module is used for determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
Specifically, when dangerous gas leakage occurs, the gas phase composition between the photoacoustic cells changes, the corresponding relation between the laser frequency and the acoustic signal under normal conditions changes, and meanwhile, the temperature and pressure sensor 302 located in the photoacoustic cell 104 functions to collect and store pressure data and temperature data in real time. In order to further study the diffusivity of inert gas in dangerous gas, the diffusion coefficient of the mixed gas in the photoacoustic cell is determined according to pressure data and temperature data based on a mathematical model of molecular dynamics.
In this embodiment, the diffusion coefficient of the inert gas in the hazardous gas can be calculated based on the gas detection device without complicated devices and operations. In some embodiments, the inert gas may be helium, the hazardous gas may be hydrogen, and the diffusion coefficient of helium in hydrogen is detected by the gas detection device in this embodiment.
In one embodiment, the diffusion coefficient is calculated using the following formula:
wherein D isABRepresenting the diffusion coefficient of the mixed gas in the photoacoustic cell; t is the temperature in the photoacoustic cell, PGeneral assemblyIs the total pressure in the photoacoustic cell; mA、MBRespectively the molecular weight of the hazardous gas and the inert gas; v. ofA、vBRespectively, the molecular diffusion volumes of the hazardous gas and the inert gas.
In one embodiment, as shown in fig. 4, the present application provides a gas detection apparatus applied to a hazardous gas container 102 having a first valve 112 thereon, the apparatus comprising a photoacoustic cell 104, an inert gas container 106, a hazardous gas detection module 108, a frequency-converting laser 202, a microphone 204, a lock-in amplifier 206, a second spectrum acquisition module 208, a frequency adjustment module 402, a gas concentration detection module 404, a temperature and pressure sensor 302, and a diffusion coefficient determination module 406. The inert gas container 106 has a second valve 110. The photoacoustic cell may have an exhaust valve 408, and when the concentration of the hazardous gas in the photoacoustic cell reaches the concentration safety threshold, an exhaust signal is sent to the exhaust valve 408 of the photoacoustic cell, so that the photoacoustic cell opens the exhaust valve to exhaust the mixed gas with the concentration reaching the concentration safety threshold through the exhaust valve. The concentration safety threshold can be determined in combination with the actual situation, such as the type of dangerous gas, the type of inert gas, etc. The functions of the respective constituent elements have been described above and will not be described in detail herein.
In some embodiments, the hazardous gas detection module 108, the second spectrum acquisition module 208, the gas concentration detection module 404, the frequency adjustment module 402, and the diffusion coefficient determination module 406 may be integrated on one computer device (e.g., referred to as a data processing and feedback center) or distributed on different computer devices (e.g., referred to as a data processing and feedback center, where the data processing and feedback center includes several computer devices).
In some embodiments, the hazardous gas is hydrogen, the inert gas is helium, and the data processing and feedback center performs the determination of the relationship between the laser absorption spectrum and the laser emission frequency of the air and hydrogen before the monitoring function is performed. When leaked hydrogen enters the photoacoustic cell, an optical signal different from air is generated, then the data collection and feedback center receives an abnormal absorption peak spectrum, an instruction is sent, the first valve 112 is closed, the second valve 110 is opened, the leaked hydrogen is diluted, the frequency of the frequency-modulated pulse power supply controls the frequency of the variable-frequency laser emitter, the light absorption frequency value is changed to the hydrogen absorption peak spectrum, meanwhile, the temperature and pressure sensor measures the temperature and the pressure, the hydrogen absorption peak spectrum change is continuously observed along with the continuous addition of helium until the hydrogen concentration is reduced to 4%, and the second valve 110 can be controlled to be closed. Meanwhile, the diffusion coefficient is calculated through a molecular dynamics mathematical model, data acquisition and analysis are completed through a data processing and feedback center, and after the safety of the gas in the photoacoustic cell is confirmed, the exhaust valve 408 is opened to exhaust the safe mixed gas out of the outdoor environment.
In some embodiments, the modulated pulse power supply driven variable frequency laser transmitter can emit optical signals with different frequencies, and the optical waves are enhanced after passing through the focusing lens; the valve connected with the high-pressure helium tank is normally closed, the valve connected with the liquid hydrogen storage tank is normally opened, after the liquid hydrogen storage tank leaks, vaporized hydrogen enters the photoacoustic cell to be excited, energy is absorbed to cause local heating to generate sound waves, a microphone positioned outside the photoacoustic cell can convert sound signals into corresponding electric signals, and the electric signals are amplified by the image-locking amplifier and transmitted to the data collection and feedback center together with data measured by the temperature and pressure sensor; and finally, the data collection and feedback center guides the frequency conversion laser to adjust the frequency so as to measure the concentration of the absorbed hydrogen, the absorbed hydrogen is safely discharged from an exhaust valve after reaching the lower limit of hydrogen explosion of 4%, and the diffusion coefficient is calculated through a molecular dynamics mathematical model.
In one embodiment, the present application provides a gas detection method for use with a hazardous gas container having a first valve thereon, the detection method comprising: when dangerous gas exists in the photoacoustic cell, a closing signal is sent to a first valve of the dangerous gas container, and an opening signal is sent to a second valve of the inert gas container, so that the inert gas container outputs inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas.
Wherein the photoacoustic cell is connected with the hazardous gas container through the first valve and is used for containing hazardous gas leaked from the hazardous gas container; the inert gas container is connected with the dangerous gas container through the second valve and is used for storing inert gas.
In one embodiment, the hazardous gas detection method includes:
acquiring first spectral data and second spectral data;
when the second spectrum data is different from the first spectrum data, judging that the dangerous gas is leaked into the photoacoustic cell from the dangerous gas container;
wherein the first spectrum data is absorption peak spectrum data when the hazardous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the hazardous gas is leaked from the hazardous gas container.
In one embodiment, the method further comprises:
acquiring a plurality of third spectral data and the second spectral data, wherein the third spectral data are spectral data obtained by performing spectral acquisition on a plurality of dangerous gases with different concentrations, and the second spectral data are absorption peak spectral data in the photoacoustic cell when the dangerous gas container leaks the dangerous gases;
and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of each third spectral data and the second spectral data.
In one embodiment, the method further comprises:
acquiring pressure data and temperature data in the photoacoustic cell;
and determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
In one embodiment, the diffusion coefficient is calculated using the following formula:
wherein D isABRepresenting a diffusion coefficient of a mixed gas within the photoacoustic cell; t is the temperature in the photoacoustic cell, PGeneral assemblyIs the total pressure within the photoacoustic cell; mA、MBRespectively the molecular weight of the hazardous gas and the inert gas; v. ofA、vBRespectively, the molecular diffusion volumes of the hazardous gas and the inert gas.
In one embodiment, the present application provides a gas detection method applied to a hazardous gas container having a first valve thereon, as shown in fig. 5, the detection method comprising:
and S510, acquiring first spectrum data.
Wherein, the first atlas data is absorption peak data when no dangerous gas exists in the photoacoustic cell.
And S520, acquiring second spectrum data.
And the second spectral data is absorption peak spectral data in the photoacoustic cell when the dangerous gas is leaked from the dangerous gas container.
And S530, when the second spectrum data is different from the first spectrum data, judging that the dangerous gas container leaks the dangerous gas into the photoacoustic cell.
S540, sending a closing signal to a first valve of the dangerous gas container and sending an opening signal to a second valve of the inert gas container, so that the inert gas container outputs inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas;
the photoacoustic cell is connected with the dangerous gas container through a first valve and is used for containing dangerous gas leaked from the dangerous gas container; the inert gas container is connected with the dangerous gas container through a second valve and is used for storing inert gas.
And S550, acquiring a plurality of third spectrum data.
Wherein the third spectral data is spectral data obtained by performing spectral acquisition on a plurality of dangerous gases with different concentrations,
and S560, determining the concentration of the dangerous gas in the photoacoustic cell according to the comparison result of the third spectral data and the second spectral data.
And S570, when the concentration of the dangerous gas in the photoacoustic cell reaches a concentration safety threshold, sending an exhaust signal to an exhaust valve of the photoacoustic cell so that the photoacoustic cell opens the exhaust valve and exhausts the mixed gas with the concentration reaching the concentration safety threshold through the exhaust valve.
S580, acquiring pressure data and temperature data in the photoacoustic cell;
and S590, determining the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data.
Specifically, the diffusion coefficient is calculated using the following formula:
wherein D isABRepresenting a diffusion coefficient of a mixed gas within the photoacoustic cell; t is the temperature in the photoacoustic cell, PGeneral assemblyIs the total pressure within the photoacoustic cell; mA、MBRespectively the molecular weight of the hazardous gas and the inert gas; v. ofA、vBRespectively, the molecular diffusion volumes of the hazardous gas and the inert gas.
For specific limitations of the gas detection method, reference may be made to the above limitations of the gas detection device, which are not described herein again. The modules in the gas detection device can be wholly or partially realized by software, hardware and a combination thereof. The modules can be embedded in a hardware form or independent from a processor in the computer device, and can also be stored in a memory in the computer device in a software form, so that the processor can call and execute operations corresponding to the modules.
In one embodiment, a computer device is provided, which may be a terminal, and its internal structure diagram may be as shown in fig. 6. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected by a system bus. Wherein the processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of an operating system and computer programs in the non-volatile storage medium. The communication interface of the computer device is used for carrying out wired or wireless communication with an external terminal, and the wireless communication can be realized through WIFI, an operator network, NFC (near field communication) or other technologies. The computer program is executed by a processor to implement a gas detection method. The display screen of the computer equipment can be a liquid crystal display screen or an electronic ink display screen, and the input device of the computer equipment can be a touch layer covered on the display screen, a key, a track ball or a touch pad arranged on the shell of the computer equipment, an external keyboard, a touch pad or a mouse and the like.
Those skilled in the art will appreciate that the architecture shown in fig. 6 is merely a block diagram of some of the structures associated with the disclosed aspects and is not intended to limit the computing devices to which the disclosed aspects apply, as particular computing devices may include more or less components than those shown, or may combine certain components, or have a different arrangement of components.
In an embodiment, a computer device is provided, comprising a memory in which a computer program is stored and a processor, which when executing the computer program performs the method steps in the above embodiments.
In an embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which computer program, when being executed by a processor, carries out the method steps of the above-mentioned embodiments.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by hardware instructions of a computer program, which can be stored in a non-volatile computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. Any reference to memory, storage, database or other medium used in the embodiments provided herein can include at least one of non-volatile and volatile memory. Non-volatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical storage, or the like. Volatile Memory can include Random Access Memory (RAM) or external cache Memory. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM), among others.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A gas detection device for use with a hazardous gas container having a first valve thereon, the detection device comprising:
the photoacoustic cell is connected with the dangerous gas container through the first valve and is used for containing dangerous gas leaked from the dangerous gas container;
an inert gas container having a second valve connected to the hazardous gas container through the second valve for storing inert gas;
and the dangerous gas detection module is used for sending a closing signal to the first valve and sending an opening signal to the second valve when dangerous gas is detected to exist in the photoacoustic cell, so that the inert gas container outputs the inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas.
2. The apparatus of claim 1, wherein the hazardous gas detection module is further configured to obtain first spectral data and second spectral data, and when the second spectral data is different from the first spectral data, determine that the hazardous gas container leaks the hazardous gas into the photoacoustic cell;
wherein the first spectrum data is absorption peak spectrum data when the hazardous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the hazardous gas is leaked from the hazardous gas container.
3. The apparatus of claim 2, further comprising:
the variable frequency laser is used for providing laser with different frequencies to irradiate mixed gas in the photoacoustic cell, and the mixed gas comprises the dangerous gas and the inert gas;
the microphone is arranged on the photoacoustic cell and used for detecting a pressure fluctuation signal;
the lock-in amplifier is connected with the output end of the microphone and is used for converting the pressure fluctuation signal into a photoelectric signal;
the second spectrum acquisition module is used for analyzing the photoelectric signal to obtain second spectrum data;
and the frequency adjusting module is used for adjusting the frequency of the frequency conversion laser according to the second spectrum data.
4. The apparatus of claim 2, further comprising:
the gas concentration detection module is used for acquiring a plurality of third spectral data and the second spectral data and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of the third spectral data and the second spectral data;
the third spectral data are spectral data obtained by performing spectral acquisition on a plurality of dangerous gases with different concentrations;
and the gas concentration detection module is also used for sending an exhaust signal to an exhaust valve of the photoacoustic cell when the concentration of the dangerous gas in the photoacoustic cell reaches a concentration safety threshold value, so that the photoacoustic cell opens the exhaust valve, and the exhaust valve exhausts the mixed gas of which the concentration reaches the concentration safety threshold value.
5. The apparatus of any one of claims 1 to 4, further comprising:
the temperature and pressure sensor is arranged in the photoacoustic cell and used for acquiring pressure data and temperature data in the photoacoustic cell;
and the diffusion coefficient determining module is used for calculating the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data by adopting the following formula:
wherein D isABRepresenting a diffusion coefficient of a mixed gas within the photoacoustic cell; t is the temperature in the photoacoustic cell, PGeneral assemblyIs the total pressure within the photoacoustic cell; mA、MBRespectively the molecular weight of the hazardous gas and the inert gas; v. ofA、vBRespectively, the molecular diffusion volumes of the hazardous gas and the inert gas.
6. A method for detecting a gas, the method being applied to a hazardous gas container having a first valve thereon, the method comprising:
when dangerous gas exists in the photoacoustic cell, sending a closing signal to a first valve of the dangerous gas container and sending an opening signal to a second valve of an inert gas container, so that the inert gas container outputs inert gas to the photoacoustic cell, and the dangerous gas in the photoacoustic cell is diluted by the inert gas;
wherein the photoacoustic cell is connected with the hazardous gas container through the first valve and is used for containing hazardous gas leaked from the hazardous gas container; the inert gas container is connected with the dangerous gas container through the second valve and is used for storing inert gas.
7. The method of claim 6, wherein the hazardous gas detection means comprises:
acquiring first spectral data and second spectral data;
when the second spectrum data is different from the first spectrum data, judging that the dangerous gas is leaked into the photoacoustic cell from the dangerous gas container;
wherein the first spectrum data is absorption peak spectrum data when the hazardous gas does not exist in the photoacoustic cell, and the second spectrum data is absorption peak spectrum data in the photoacoustic cell when the hazardous gas is leaked from the hazardous gas container.
8. The method of claim 6, further comprising:
acquiring a plurality of third spectral data and second spectral data, wherein the third spectral data are spectral data obtained by performing spectral acquisition on a plurality of dangerous gases with different concentrations, and the second spectral data are absorption peak spectral data in the photoacoustic cell when the dangerous gas container leaks the dangerous gases;
and determining the concentration of dangerous gas in the photoacoustic cell according to the comparison result of each third spectral data and the second spectral data.
9. The method according to any one of claims 6 to 8, further comprising:
acquiring pressure data and temperature data in the photoacoustic cell;
calculating the diffusion coefficient of the mixed gas in the photoacoustic cell according to the pressure data and the temperature data by adopting the following formula:
wherein D isABRepresenting a diffusion coefficient of a mixed gas within the photoacoustic cell; t is the temperature in the photoacoustic cell, PGeneral assemblyIs the total pressure within the photoacoustic cell; mA、MBRespectively the molecular weight of the hazardous gas and the inert gas; v. ofA、vBIndividual watchIndicating the molecular diffusion volume of the dangerous gas and the inert gas.
10. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor realizes the steps of the method of any one of claims 6 to 9 when executing the computer program.
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