CN114839154A - Device and method for detecting hydrogen sulfide gas - Google Patents
Device and method for detecting hydrogen sulfide gas Download PDFInfo
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- 239000007789 gas Substances 0.000 title claims abstract description 106
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 title claims abstract description 61
- 229910000037 hydrogen sulfide Inorganic materials 0.000 title claims abstract description 61
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000001514 detection method Methods 0.000 claims abstract description 110
- 239000000835 fiber Substances 0.000 claims abstract 4
- 230000003595 spectral effect Effects 0.000 claims description 90
- 238000001228 spectrum Methods 0.000 claims description 40
- 239000013307 optical fiber Substances 0.000 claims description 10
- 230000005284 excitation Effects 0.000 claims description 9
- 238000005311 autocorrelation function Methods 0.000 claims description 3
- 230000004888 barrier function Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 230000035939 shock Effects 0.000 claims description 3
- 238000004458 analytical method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000002329 infrared spectrum Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 235000013601 eggs Nutrition 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000005416 organic matter Substances 0.000 description 1
- 238000002336 sorption--desorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
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Abstract
The invention discloses a device and a method for detecting hydrogen sulfide gas. The device includes controller, detection room, first aspiration pump and second aspiration pump, it is equipped with infrared light source and infrared detection device to detect indoor left and right sides symmetry, infrared detection device includes first infrared detection module and the infrared detection module of second, still be equipped with reference optic fibre in the detection room, refer to the optic fibre both ends and be connected with infrared light source and the infrared detection module of second respectively, be equipped with air inlet and gas outlet on the detection room, be equipped with first solenoid valve on the air inlet, be equipped with the second solenoid valve on the gas outlet, the air inlet passes through connecting tube and is connected with first aspiration pump, second aspiration pump, still be equipped with baroceptor in the detection room. The method can quickly and accurately detect the concentration of the hydrogen sulfide gas, and has good detection repeatability and high stability.
Description
Technical Field
The invention relates to the technical field of toxic gas detection, in particular to a device and a method for detecting hydrogen sulfide gas.
Background
Hydrogen sulfide has the chemical formula H2S, is colorless, smelly with rotten eggs, toxic, corrosive and flammable, is usually produced by microorganisms decomposing organic matter under anaerobic conditions, is usually called anaerobic digestion, is accomplished by sulfate reducing bacteria, and is a flammable acidic gas under standard conditions.
At present, a gas sensing element is generally made of a high-sensitivity gas sensitive material to detect hydrogen sulfide gas, but the gas sensitive material generally needs an adsorption-desorption process, and if desorption is not complete, the sensing element cannot be restored to an initial state, that is, a detection signal cannot be restored to a baseline position, so that detection repeatability is not good enough, and the accuracy of detecting hydrogen sulfide gas is affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides a device and a method for detecting hydrogen sulfide gas, which can quickly and accurately detect the concentration of the hydrogen sulfide gas, and have good detection repeatability and high stability.
In order to solve the problems, the invention adopts the following technical scheme:
the invention discloses a device for detecting hydrogen sulfide gas, which comprises a controller, a detection chamber, a first air pump and a second air pump, wherein an infrared light source and an infrared detection device are symmetrically arranged on the left side and the right side in the detection chamber, the infrared detection device comprises a first infrared detection module and a second infrared detection module, a reference optical fiber is further arranged in the detection chamber, two ends of the reference optical fiber are respectively connected with the infrared light source and the second infrared detection module, an air inlet and an air outlet are arranged on the detection chamber, a first electromagnetic valve is arranged on the air inlet, a second electromagnetic valve is arranged on the air outlet, the air inlet is connected with the first air pump and the second air pump through connecting pipelines, an air pressure sensor is further arranged in the detection chamber, and the controller is respectively connected with the first air pump, the second air pump, the infrared light source, the first infrared detection module and the second infrared detection module, The first electromagnetic valve, the second electromagnetic valve and the air pressure sensor are electrically connected.
In this scheme, during the detection, start first aspiration pump earlier and let in clean air from the air inlet of detection room, wash the detection room, wash t1 seconds back, control first aspiration pump stop work, start the air discharge in the gas suction detection room will be detected with the gas suction that awaits measuring to the second aspiration pump, control the second solenoid valve and close after t2 seconds, the second aspiration pump continues to reach 2 atmospheric pressure with the gas suction detection room that awaits measuring until baroceptor detects the atmospheric pressure in the detection room, control first solenoid valve and close after that, second aspiration pump stop work. And then, starting the infrared light source to emit infrared light, detecting the spectrum data of the infrared light passing through the gas to be detected by the first infrared detection module and sending the spectrum data to the controller, detecting the spectrum data of the infrared light passing through the reference optical fiber by the second infrared detection module and sending the spectrum data to the controller, processing the spectrum data detected by the first infrared detection module and the second infrared detection module by the controller, judging whether the gas to be detected is hydrogen sulfide gas, and if the gas to be detected is the hydrogen sulfide gas, calculating the concentration of the hydrogen sulfide gas.
Preferably, the device for detecting hydrogen sulfide gas further comprises a display, and the display is electrically connected with the controller. The display is used for displaying the detection result.
Preferably, the device for detecting hydrogen sulfide gas further comprises a wireless communication module, and the wireless communication module is electrically connected with the controller. The wireless communication module is used for sending the detection result to the cloud storage.
Preferably, the device for detecting hydrogen sulfide gas further comprises a tail gas treatment device for absorbing hydrogen sulfide gas, and the tail gas treatment device is connected with the gas outlet through a connecting pipeline. The detected hydrogen sulfide gas is prevented from being discharged into the air.
The method for detecting the hydrogen sulfide gas is used for the device for detecting the hydrogen sulfide gas, and comprises the following steps:
s1: the first air pump introduces clean air from an air inlet of the detection chamber, the air flows out from an air outlet of the detection chamber, the detection chamber is cleaned for t1 seconds, the first air pump stops working after t1 seconds, the second air pump pumps gas to be detected into the detection chamber to discharge the air in the detection chamber, the second air pump lasts for t2 seconds, the second electromagnetic valve is closed after t2 seconds, when the air pressure sensor detects that the air pressure in the detection chamber reaches 2 atmospheric pressures, the first electromagnetic valve is closed, and the second air pump stops working;
s2: the method comprises the steps that an infrared light source is started to emit infrared light, the infrared light penetrates through gas to be detected and is detected by a first infrared detection module, the first infrared detection module sends a detected spectrum data set D1 to a controller, the spectrum data set D1 comprises n spectrum data, the infrared light is detected by a second infrared detection module after passing through a reference optical fiber, the second infrared detection module sends a detected spectrum data set D2 to the controller, the spectrum data set D2 comprises n spectrum data, and each spectrum data is composed of a wave number sp and a corresponding spectrum intensity wn;
s3: the controller arranges the spectral data in the spectral data set D1 from large to small according to wave number to obtain a spectral data set L1, L1 { (G) 1 (1)、G 1 (2)…G 1 (n) }, i-th spectral data G in the set of spectral data L1 1 (i)＝(wn 1 (i)、sp 1 (i))，1≤i≤n，sp 1 (i) As spectral data G 1 (i) Spectral intensity of middle (Wn) 1 (i) As spectral data G 1 (i) Wave number of (1);
the controller arranges the spectral data in the spectral data set D2 from large to small according to wave number to obtain a spectral data set L2, L2 { (G) 2 (1)、G 2 (2)…G 2 (n) }, i-th spectral data G in the set of spectral data L2 2 (i)＝(wn 2 (i)、sp 2 (i))，sp 2 (i) As spectral data G 2 (i) Spectral intensity of middle (Wn) 2 (i) As spectral data G 2 (i) Wave number of (1);
the controller subtracts the spectral intensity of the corresponding spectral data in the spectral data set L2 from the spectral intensity of the spectral data in the spectral data set L1 to obtain a spectral data set L3, L3 ═ G 3 (1)、G 3 (2)…G 3 (n) }, i-th spectral data G in the set of spectral data L3 3 (i)＝(wn 3 (i)、sp 3 (i))，
Wherein wn 3 (i)＝wn 2 (i)-wn 1 (i)，sp 3 (i)＝sp 1 (i)＝sp 2 (i)，sp 3 (i) As spectral data G 3 (i) Spectral intensity of middle (Wn) 3 (i) As spectral data G 3 (i) Wave number of (1);
s4: the controller calculates an intensity wave ratio tr corresponding to each spectral data in the spectral data set L3 to obtain an intensity wave ratio data set T, { T (1), tr (2) … tr (n) }, tr (i) }, which is the ith spectral data G in the spectral data set L3 3 (i) The corresponding intensity wave ratio, i is more than or equal to 1 and less than or equal to n,
s5: the controller inputs data in the intensity wave ratio data set T into a nonlinear resonance model, a characteristic signal-to-noise ratio SNR is obtained through calculation by using the nonlinear resonance model, a first rectangular coordinate system is established by using the excitation noise intensity as an X axis and the signal-to-noise ratio value as a Y axis, and a characteristic signal-to-noise ratio curve is drawn in the first rectangular coordinate system;
s6: drawing an auxiliary line vertically connected with the Y axis from the point with the maximum signal-to-noise ratio value on the characteristic signal-to-noise ratio curve to the Y axis;
numbering the wave troughs on the characteristic signal-to-noise ratio curve from left to right to be 1 and 2 … … m, wherein m is the number of the wave troughs on the characteristic signal-to-noise ratio curve, selecting the first m-1 wave troughs on the characteristic signal-to-noise ratio curve, taking each wave trough as a starting point, making a first connecting line which penetrates through the left adjacent wave crest and making a second connecting line which penetrates through the right adjacent wave crest, wherein the first connecting line and the second connecting line are intersected with an auxiliary line, and the first connecting line, the second connecting line and the auxiliary line which take each wave trough as the starting point enclose an enveloping area corresponding to each wave trough, and calculating the area of the enveloping area corresponding to each wave trough;
s7: the controller establishes a second rectangular coordinate system by taking the trough number as an x axis and the area of the envelope region as a y axis, points formed by each trough number and the corresponding area of the envelope region are marked in the second rectangular coordinate system, linear fitting is carried out to obtain a formula y which is kx + D, if g1 is not less than k which is not less than g2, the gas to be detected is hydrogen sulfide gas, and the concentration of the hydrogen sulfide gas is hydrogen sulfide gas
If k is less than g1 or k is more than g2, the gas to be detected is not hydrogen sulfide gas.
The scheme adopts a continuous 'wave trough + adjacent wave crest' to determine an envelope region, calculates the area of the envelope region, linearly fits a vector formed by the area of the envelope region, judges whether the gas to be detected is hydrogen sulfide gas or not according to the slope of a linear fitting straight line, calculates the concentration of the hydrogen sulfide gas according to intercept, and has better stability than an infrared spectrum direct analysis method. The scheme can quickly and accurately detect the hydrogen sulfide gas and the concentration thereof, and has good detection repeatability and high stability.
Preferably, the step S5 includes the steps of:
the controller inputs the data in the intensity wave ratio data set T into a nonlinear resonance model:
where x is the position of the virtual particle in the nonlinear resonance model, V (x) is the nonlinear symmetric potential function, A is the input signal strength, f 0 In order to modulate the frequency of the signal,
for the initial phase, D is the excitation noise intensity, a and b are both coefficients, and ξ (i) is the ith white Gaussian noise whose autocorrelation function is: e [ xi (i) xi (0)]2D δ (i), δ (i) being the shock function;
when D ═ D 1 Then the nonlinear resonance model generates resonance to obtain the characteristic signal-to-noise ratio SNR,
wherein, V 0 Is the barrier height;
the controller establishes a first rectangular coordinate system by taking the excitation noise intensity as an X axis and the signal-to-noise ratio value as a Y axis, and draws a characteristic signal-to-noise ratio curve in the first rectangular coordinate system.
Preferably, the step S7 further includes the steps of: the controller sends the detection result to the cloud server through the wireless communication module.
The invention has the beneficial effects that: the concentration of the hydrogen sulfide gas can be detected quickly and accurately, the detection repeatability is good, and the stability is high.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a schematic connection block diagram of an embodiment;
FIG. 3 is a schematic diagram of a characteristic signal-to-noise ratio curve;
fig. 4 is a schematic of a linear fit.
In the figure: 1. the device comprises a controller, 2, a detection chamber, 3, a first air pump, 4, a second air pump, 5, an infrared light source, 6, an infrared detection device, 7, a first infrared detection module, 8, a second infrared detection module, 9, an air inlet, 10, an air outlet, 11, a first electromagnetic valve, 12, a second electromagnetic valve, 13, an air pressure sensor, 14, a display, 15, a wireless communication module, 16, a tail gas treatment device, 17 and a reference optical fiber.
Detailed Description
The technical scheme of the invention is further specifically described by the following embodiments and the accompanying drawings.
Example (b): the device for detecting hydrogen sulfide gas in this embodiment, as shown in fig. 1 and fig. 2, includes a controller 1, a detection chamber 2, a first air pump 3, a second air pump 4, a display 14, a wireless communication module 15, and a tail gas treatment device 16 for absorbing hydrogen sulfide gas, wherein an infrared light source 5 and an infrared detection device 6 are symmetrically disposed on left and right sides in the detection chamber 2, the infrared detection device 6 includes a first infrared detection module 7 and a second infrared detection module 8, a reference optical fiber 17 is further disposed in the detection chamber 2, two ends of the reference optical fiber 17 are respectively connected with the infrared light source 5 and the second infrared detection module 8, the detection chamber 2 is provided with an air inlet 9 and an air outlet 10, the air inlet 9 is provided with a first electromagnetic valve 11, the air outlet 10 is provided with a second electromagnetic valve 12, the air inlet 9 is connected with the first air pump 3 and the second air pump 4 through a connecting pipeline, the tail gas treatment device 16 is connected with the air outlet 10 through a connecting pipeline, the detection chamber 2 is also internally provided with an air pressure sensor 13, and the controller 1 is respectively electrically connected with the first air pump 3, the second air pump 4, the infrared light source 5, the first infrared detection module 7, the second infrared detection module 8, the first electromagnetic valve 11, the second electromagnetic valve 12, the air pressure sensor 13, the display 14 and the wireless communication module 15.
In this scheme, during the detection, start first aspiration pump earlier and let in clean air from the air inlet of detection room, wash the detection room, wash t1 seconds back, control first aspiration pump stop work, start the air discharge in the gas suction detection room will be detected with the gas suction that awaits measuring to the second aspiration pump, control the second solenoid valve and close after t2 seconds, the second aspiration pump continues to reach 2 atmospheric pressure with the gas suction detection room that awaits measuring until baroceptor detects the atmospheric pressure in the detection room, control first solenoid valve and close after that, second aspiration pump stop work. Then, an infrared light source is started to emit infrared light, the first infrared detection module detects the spectrum data of the infrared light penetrating through the gas to be detected and sends the spectrum data to the controller, the second infrared detection module detects the spectrum data of the infrared light penetrating through the reference optical fiber and sends the spectrum data to the controller, the controller processes the spectrum data detected by the first infrared detection module and the second infrared detection module, whether the gas to be detected is hydrogen sulfide gas or not is judged, if the gas to be detected is the hydrogen sulfide gas, the concentration of the hydrogen sulfide gas is calculated, the display displays the detection result, and the wireless communication module sends the detection result to the cloud for storage. The tail gas treatment device absorbs hydrogen sulfide gas, and the detected hydrogen sulfide gas is prevented from being discharged into the air.
The method for detecting hydrogen sulfide gas in the embodiment is used for the device for detecting hydrogen sulfide gas, and comprises the following steps:
s1: the first air pump introduces clean air from an air inlet of the detection chamber, the air flows out from an air outlet of the detection chamber, the detection chamber is cleaned for t1 seconds, the first air pump stops working after t1 seconds, the second air pump pumps gas to be detected into the detection chamber to discharge the air in the detection chamber, the second air pump lasts for t2 seconds, the second electromagnetic valve is closed after t2 seconds, when the air pressure sensor detects that the air pressure in the detection chamber reaches 2 atmospheric pressures, the first electromagnetic valve is closed, and the second air pump stops working;
s2: the method comprises the steps that an infrared light source is started to emit infrared light, the infrared light penetrates through gas to be detected and is detected by a first infrared detection module, the first infrared detection module sends a detected spectrum data set D1 to a controller, the spectrum data set D1 comprises n spectrum data, the infrared light is detected by a second infrared detection module after passing through a reference optical fiber, the second infrared detection module sends a detected spectrum data set D2 to the controller, the spectrum data set D2 comprises n spectrum data, and each spectrum data is composed of a wave number sp and a corresponding spectrum intensity wn;
s3: the controller arranges the spectrum data in the spectrum data set D1 according to wave number from large to small to obtain a spectrum data set L1, wherein L1 is { G ═ G 1 (1)、G 1 (2)…G 1 (n) }, i-th spectral data G in the set of spectral data L1 1 (i)＝(wn 1 (i)、sp 1 (i))，1≤i≤n，sp 1 (i) As spectral data G 1 (i) Spectral intensity of middle (Wn) 1 (i) As spectral data G 1 (i) Wave number of (1);
the controller arranges the spectrum data in the spectrum data set D2 according to wave number from large to small to obtain a spectrum data set L2, wherein L2 is { G ═ G 2 (1)、G 2 (2)…G 2 (n) }, i-th spectral data G in the set of spectral data L2 2 (i)＝(wn 2 (i) Sp2(i)), sp2(i) is spectral data G 2 (i) Spectral intensity of middle (Wn) 2 (i) As spectral data G 2 (i) Wave number of (1);
the controller subtracts the spectral intensity of the corresponding spectral data in the spectral data set L2 from the spectral intensity of the spectral data in the spectral data set L1 to obtain a spectral data set L3, L3 ═ G 3 (1)、G 3 (2)…G 3 (n) }, i-th spectral data G in the set of spectral data L3 3 (i)＝(wn 3 (i)、sp 3 (i))，
Wherein wn 3 (i)＝wn 2 (i)-wn 1 (i)，sp 3 (i)＝sp 1 (i)＝sp 2 (i)，sp 3 (i) As spectral data G 3 (i) Spectral intensity of middle (Wn) 3 (i) As spectral data G 3 (i) Wave number of (1);
s4: the controller calculates an intensity wave ratio tr corresponding to each spectral data in the spectral data set L3 to obtain an intensity wave ratio data set T, { tr (1), tr (2) … tr (n) }, tr (i) which is the ith spectral data G in the spectral data set L3 3 (i) The corresponding intensity wave ratio, i is more than or equal to 1 and less than or equal to n,
s5: the controller inputs data in the intensity wave ratio data set T into a nonlinear resonance model, a characteristic signal-to-noise ratio SNR is obtained through calculation by using the nonlinear resonance model, a first rectangular coordinate system is established by using the excitation noise intensity as an X axis and the signal-to-noise ratio value as a Y axis, and a characteristic signal-to-noise ratio curve is drawn in the first rectangular coordinate system;
s6: drawing an auxiliary line vertically connected with the Y axis from the point with the maximum signal-to-noise ratio value on the characteristic signal-to-noise ratio curve to the Y axis;
numbering the wave troughs on the characteristic signal-to-noise ratio curve from left to right to be 1 and 2 … … m, wherein m is the number of the wave troughs on the characteristic signal-to-noise ratio curve, selecting the first m-1 wave troughs on the characteristic signal-to-noise ratio curve, taking each wave trough as a starting point, making a first connecting line which penetrates through the left adjacent wave crest and making a second connecting line which penetrates through the right adjacent wave crest, wherein the first connecting line and the second connecting line are intersected with an auxiliary line, and the first connecting line, the second connecting line and the auxiliary line which take each wave trough as the starting point enclose an enveloping area corresponding to each wave trough, and calculating the area of the enveloping area corresponding to each wave trough;
s7: the controller establishes a second rectangular coordinate system by taking the trough number as an x axis and the area of the envelope region as a y axis, points formed by the trough number and the area of the envelope region corresponding to the trough number are marked in the second rectangular coordinate system, linear fitting is carried out to obtain a formula y which is kx + D, if k is more than or equal to 2.4 and less than or equal to 2.7, the gas to be detected is hydrogen sulfide gas, and the concentration of the hydrogen sulfide gas is hydrogen sulfide gas
If k is less than 2.4 or k is more than 2.7, the gas to be detected is not hydrogen sulfide gas;
the controller sends the detection result to the cloud server through the wireless communication module.
Step S5 includes the following steps:
the controller inputs the data in the intensity wave ratio data set T into a nonlinear resonance model:
where x is the position of the virtual particle in the nonlinear resonance model, V (x) is the nonlinear symmetric potential function, A is the input signal strength, f 0 In order to modulate the frequency of the signal,
for the initial phase, D is the excitation noise intensity, a and b are both coefficients, and ξ (i) is the ith white Gaussian noise whose autocorrelation function is: e [ xi (i) xi (0)]2D δ (i), δ (i) being the shock function;
when D ═ D 1 Then the nonlinear resonance model generates resonance to obtain the characteristic signal-to-noise ratio SNR,
wherein, V 0 Is the barrier height;
the controller establishes a first rectangular coordinate system by taking the excitation noise intensity as an X axis and the signal-to-noise ratio value as a Y axis, and draws a characteristic signal-to-noise ratio curve in the first rectangular coordinate system.
The scheme adopts a continuous 'wave trough + adjacent wave crest' to determine an envelope region, calculates the area of the envelope region, linearly fits a vector formed by the area of the envelope region, judges whether the gas to be detected is hydrogen sulfide gas or not according to the slope of a linear fitting straight line, calculates the concentration of the hydrogen sulfide gas according to intercept, and has better stability than an infrared spectrum direct analysis method. The scheme can quickly and accurately detect the hydrogen sulfide gas and the concentration thereof, and has good detection repeatability and high stability.
In this embodiment, after detecting a kind of gas to be measured, points formed by each valley number and the corresponding area of the envelope region are marked in the second rectangular coordinate system, and as shown in fig. 4, the linear fitting obtains a formula y of 2.55x +26.08, and since k is 2.55, the gas to be measured is a hydrogen sulfide gas, and the concentration of the hydrogen sulfide gas is 5.139 ppm.
After a characteristic signal-to-noise ratio curve is drawn in the first rectangular coordinate system, an envelope region corresponding to each trough is drawn, and the following example is performed:
fig. 3 is a characteristic snr curve drawn by the controller in the first rectangular coordinate system when detecting a gas to be detected, where a trough numbered 1 on the characteristic snr curve in fig. 2 is a point o, an adjacent peak on the left side thereof is a point p, an adjacent peak on the right side thereof is a point q, a first connection line passing through the point p is made with the point o as a starting point, a second connection line passing through the point q is made with the point o as a starting point, the first connection line intersects with the auxiliary line at a point m, the second connection line intersects with the auxiliary line at a point n, and an envelope region corresponding to the trough numbered 1 is a triangle omn. And sequentially drawing the envelope area corresponding to each trough from left to right according to the method until the last trough.
Claims (7)
1. The utility model provides a device for detecting hydrogen sulfide gas, its characterized in that, includes controller (1), detects room (2), first aspiration pump (3) and second aspiration pump (4), it is equipped with infrared light source (5) and infrared detection device (6) to detect left and right sides symmetry in room (2), infrared detection device (6) are including first infrared detection module (7) and second infrared detection module (8), still be equipped with in detecting room (2) and refer to optic fibre (17), refer to optic fibre (17) both ends and be connected with infrared light source (5) and second infrared detection module (8) respectively, be equipped with air inlet (9) and gas outlet (10) on detecting room (2), be equipped with first solenoid valve (11) on air inlet (9), be equipped with second solenoid valve (12) on gas outlet (10), air inlet (10) are through connecting tube and first aspiration pump (3), The second air pump (4) is connected, an air pressure sensor (13) is further arranged in the detection chamber (2), and the controller (1) is electrically connected with the first air pump (3), the second air pump (4), the infrared light source (5), the first infrared detection module (7), the second infrared detection module (8), the first electromagnetic valve (11), the second electromagnetic valve (12) and the air pressure sensor (13) respectively.
2. The device for detecting hydrogen sulfide gas according to claim 1, further comprising a display (14), wherein the display (14) is electrically connected to the controller (1).
3. The device for detecting hydrogen sulfide gas according to claim 1, further comprising a wireless communication module (15), wherein the wireless communication module (15) is electrically connected with the controller (1).
4. The device for detecting hydrogen sulfide gas as claimed in claim 1, further comprising an exhaust gas treatment device (16) for absorbing hydrogen sulfide gas, wherein the exhaust gas treatment device (16) is connected with the gas outlet (10) through a connecting pipeline.
5. A method for detecting hydrogen sulfide gas for use in the apparatus for detecting hydrogen sulfide gas of claim 1, comprising the steps of:
s1: the first air pump introduces clean air from an air inlet of the detection chamber, the air flows out from an air outlet of the detection chamber, the detection chamber is cleaned for t1 seconds, the first air pump stops working after t1 seconds, the second air pump pumps gas to be detected into the detection chamber to discharge the air in the detection chamber, the second air pump lasts for t2 seconds, the second electromagnetic valve is closed after t2 seconds, when the air pressure sensor detects that the air pressure in the detection chamber reaches 2 atmospheric pressures, the first electromagnetic valve is closed, and the second air pump stops working;
s2: the method comprises the steps that an infrared light source is started to emit infrared light, the infrared light penetrates through gas to be detected and is detected by a first infrared detection module, the first infrared detection module sends a detected spectrum data set D1 to a controller, the spectrum data set D1 comprises n spectrum data, the infrared light is detected by a second infrared detection module after passing through a reference optical fiber, the second infrared detection module sends a detected spectrum data set D2 to the controller, the spectrum data set D2 comprises n spectrum data, and each spectrum data is composed of a wave number sp and a corresponding spectrum intensity wn;
s3: the controller arranges the spectral data in the spectral data set D1 from large to small according to wave number to obtain a spectral data set L1, L1 { (G) 1 (1)、G 1 (2)…G 1 (n) }, i-th spectral data G in the set of spectral data L1 1 (i)＝(wn 1 (i)、sp 1 (i))，1≤i≤n，sp 1 (i) As spectral data G 1 (i) Spectral intensity of middle (Wn) 1 (i) As spectral data G 1 (i) Wave number of (1);
the controller arranges the spectral data in the spectral data set D2 from large to small according to wave number to obtain a spectral data set L2, L2 { (G) 2 (1)、G 2 (2)…G 2 (n) }, i-th spectral data G in the set of spectral data L2 2 (i)＝(wn 2 (i)、sp 2 (i))，sp 2 (i) As spectral data G 2 (i) Spectral intensity of (1), wn 2 (i) As spectral data G 2 (i) Wave number of (1);
the controller subtracts the spectral intensity of the corresponding spectral data in the spectral data set L2 from the spectral intensity of the spectral data in the spectral data set L1 to obtain a spectral data set L3, L3 ═ G 3 (1)、G 3 (2)…G 3 (n) }, i-th spectral data G in the set of spectral data L3 3 (i)＝(wn 3 (i)、sp 3 (i))，
Wherein wn 3 (i)＝wn 2 (i)-wn 1 (i)，sp 3 (i)＝sp 1 (i)＝sp 2 (i)，sp 3 (i) As spectral data G 3 (i) Spectral intensity of middle (Wn) 3 (i) As spectral data G 3 (i) Wave number of (1);
s4: the controller calculates an intensity wave ratio tr corresponding to each spectral data in the spectral data set L3 to obtain an intensity wave ratio data set T, { tr (1), tr (2) … tr (n) }, tr (i) which is the ith spectral data G in the spectral data set L3 3 (i) The corresponding intensity wave ratio, i is more than or equal to 1 and less than or equal to n,
s5: the controller inputs data in the intensity wave ratio data set T into a nonlinear resonance model, a characteristic signal-to-noise ratio SNR is obtained through calculation by using the nonlinear resonance model, a first rectangular coordinate system is established by using the excitation noise intensity as an X axis and the signal-to-noise ratio value as a Y axis, and a characteristic signal-to-noise ratio curve is drawn in the first rectangular coordinate system;
s6: drawing an auxiliary line vertically connected with the Y axis from the point with the maximum signal-to-noise ratio value on the characteristic signal-to-noise ratio curve to the Y axis;
numbering the wave troughs on the characteristic signal-to-noise ratio curve from left to right to be 1 and 2 … … m, wherein m is the number of the wave troughs on the characteristic signal-to-noise ratio curve, selecting the first m-1 wave troughs on the characteristic signal-to-noise ratio curve, taking each wave trough as a starting point, making a first connecting line which penetrates through the left adjacent wave crest and making a second connecting line which penetrates through the right adjacent wave crest, wherein the first connecting line and the second connecting line are intersected with an auxiliary line, and the first connecting line, the second connecting line and the auxiliary line which take each wave trough as the starting point enclose an enveloping area corresponding to each wave trough, and calculating the area of the enveloping area corresponding to each wave trough;
s7: the controller establishes a second rectangular coordinate system by taking the trough number as an x axis and the area of the envelope region as a y axis, points formed by each trough number and the corresponding area of the envelope region are marked in the second rectangular coordinate system, linear fitting is carried out to obtain a formula y which is kx + D, if g1 is not less than k which is not less than g2, the gas to be detected is hydrogen sulfide gas, and the concentration of the hydrogen sulfide gas is hydrogen sulfide gas
If k is less than g1 or k is more than g2, the gas to be detected is not hydrogen sulfide gas.
6. The method for detecting hydrogen sulfide gas as claimed in claim 5, wherein the step S5 includes the steps of:
the controller inputs the data in the intensity wave ratio data set T into a nonlinear resonance model:
where x is the position of the virtual particle in the nonlinear resonance model, V (x) is the nonlinear symmetric potential function, A is the input signal strength, f 0 In order to modulate the frequency of the signal,
for the initial phase, D is the excitation noise intensity, a and b are both coefficients, and ξ (i) is the ith white Gaussian noise whose autocorrelation function is: e [ xi (i) xi (0)]2D δ (i), δ (i) being the shock function; when D ═ D 1 Then the nonlinear resonance model generates resonance to obtain the characteristic signal-to-noise ratio SNR,
wherein, V 0 Is the barrier height;
the controller establishes a first rectangular coordinate system by taking the excitation noise intensity as an X axis and the signal-to-noise ratio value as a Y axis, and draws a characteristic signal-to-noise ratio curve in the first rectangular coordinate system.
7. The method for detecting hydrogen sulfide gas as claimed in claim 5, wherein the step S7 further comprises the steps of: the controller sends the detection result to the cloud server through the wireless communication module.
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| CN202210490007.0A CN114839154A (en) | 2022-04-29 | 2022-04-29 | Device and method for detecting hydrogen sulfide gas |
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