CN110554028A - Gas detection method and gas detection system based on same - Google Patents
Gas detection method and gas detection system based on same Download PDFInfo
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- CN110554028A CN110554028A CN201910991947.6A CN201910991947A CN110554028A CN 110554028 A CN110554028 A CN 110554028A CN 201910991947 A CN201910991947 A CN 201910991947A CN 110554028 A CN110554028 A CN 110554028A
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- 238000001514 detection method Methods 0.000 title claims abstract description 276
- 230000007246 mechanism Effects 0.000 claims abstract description 256
- 238000000034 method Methods 0.000 claims abstract description 20
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 44
- 238000005070 sampling Methods 0.000 claims description 33
- 238000012937 correction Methods 0.000 claims description 17
- 230000004044 response Effects 0.000 claims description 17
- 238000004458 analytical method Methods 0.000 claims description 9
- 238000000835 electrochemical detection Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 7
- 238000002038 chemiluminescence detection Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 description 310
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 29
- 230000007613 environmental effect Effects 0.000 description 9
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- 238000013461 design Methods 0.000 description 7
- 230000001105 regulatory effect Effects 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 4
- 229910002091 carbon monoxide Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 3
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- 239000000126 substance Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 206010017740 Gas poisoning Diseases 0.000 description 1
- 229920000557 Nafion® Polymers 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
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- 238000004868 gas analysis Methods 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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- 239000012286 potassium permanganate Substances 0.000 description 1
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- G01N21/75—Systems in which material is subjected to a chemical reaction, the progress or the result of the reaction being investigated
- G01N21/76—Chemiluminescence; Bioluminescence
- G01N21/766—Chemiluminescence; Bioluminescence of gases
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- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/26—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating electrochemical variables; by using electrolysis or electrophoresis
- G01N27/416—Systems
- G01N27/4163—Systems checking the operation of, or calibrating, the measuring apparatus
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Abstract
The invention discloses a gas detection method and a gas detection system based on the same, wherein the method comprises the following steps: respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism; and calculating a result difference value delta C and a result percentage difference value & C, comparing the delta C with a preset result difference value judgment value A, comparing the, & C with a preset result percentage difference value judgment value B, if the delta C is less than or equal to A and/or the & C is less than or equal to B, taking C1 as a final detection result, and if the delta C is more than A and the & C is more than B, taking C2 as a final detection result. The invention detects by two gas detection mechanisms with different detection principles, corrects the detection result deviation of the other gas detection mechanism in real time by using the detection result of one gas detection mechanism, and can ensure higher detection accuracy.
Description
Technical Field
The invention relates to the field of gas analysis and detection, in particular to a gas detection method and a gas detection system based on the same.
background
the measurement of the components and concentration of the exhaled gas in the human body can help doctors diagnose the diseases of patients, monitor the disease state, observe the treatment effect and the like, for example, the exhaled nitric oxide is used for detecting asthma, and the exhaled carbon monoxide is used for detecting gas poisoning.
The detection of exhaled nitric oxide becomes a key index for clinical judgment of respiratory diseases internationally and domestically, but the detection module of the current commercialized exhaled nitric oxide analyzer is an electrochemical method, such as a NIOXVERO model product of Circassia, the sensitivity and stability of the detection module cannot be guaranteed, although the detection module can be calibrated by standard gas, the nitric oxide concentration in human exhalation is ppb (10 ppb) level (the concentration of nitric oxide in human exhalation is 10)-9L/L), preferably using ppb standard gas for calibration, but the commercially available standard gas is ppm level for ensuring precision and storage, and larger error can be introduced by directly using the ppm level standard gas for calibration; electrochemical detection is susceptible to ambient temperature, humidity, background drift, and natural decay over time.
Disclosure of Invention
The invention aims to provide a more accurate gas detection method and a gas detection system based on the method.
In order to solve the technical problems, the invention adopts the following technical scheme: a gas detection method adopts a first gas detection mechanism and a second gas detection mechanism which have different detection principles, and comprises the following steps:
(1) Analysis of
Collecting a gas sample, and respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism;
(2) judgment of
calculating the result difference value deltaC and the result percentage difference value&C，△C＝∣C1-C2∣，Comparing the delta C with a preset result difference judgment value A,&c is compared with a preset result percentage difference value judgment value B, and if the result percentage difference value B meets the condition that deltaC is less than or equal to A and/or&C is less than or equal to B, taking C1 as a final detection result, and if Δ C > A and&C > B, thenC2 as the final assay result.
Furthermore, the first gas detection mechanism adopts an electrochemical detection principle, and the second gas detection mechanism adopts a chemiluminescence detection principle.
A gas detection system working based on the gas detection method comprises a first gas detection mechanism and a second gas detection mechanism which have different detection principles.
Further, still include gaseous sampling mechanism, gaseous storage mechanism one and gaseous storage mechanism two, the air inlet of gaseous storage mechanism one with the air inlet of gaseous storage mechanism two respectively with the gas outlet intercommunication of gaseous sampling mechanism, the gas outlet of gaseous storage mechanism one with gaseous detection mechanism one communicates, the gas outlet of gaseous storage mechanism two with gaseous detection mechanism two communicates.
further, the ozone generating mechanism is further included, the gas detection mechanism II adopts a chemiluminescence method detection principle, a reaction chamber is connected between a gas outlet of the gas storage mechanism II and the gas detection mechanism II, and a gas outlet of the ozone generating mechanism is communicated with the reaction chamber.
the gas sampling mechanism comprises a sampling pipe, a gas outlet of the sampling pipe is communicated with a gas inlet of the first gas storage mechanism and a gas inlet of the second gas storage mechanism through a first valve array, a gas outlet of the gas inlet pipe of the ozone generation mechanism is communicated with a gas inlet of the ozone generation mechanism and a gas inlet of the evacuation pipe through a second valve array, and the first valve array is communicated with the second valve array through a connecting pipe;
The first valve array is controllable, the gas outlet of the sampling pipe, the gas inlet of the first gas storage mechanism, the gas inlet of the second gas storage mechanism and the connection pipe are mutually connected and disconnected, the second valve array is controllable, the gas outlet of the ozone generation mechanism gas inlet pipe, the gas inlet of the ozone generation mechanism, the gas inlet of the emptying pipe and the connection pipe are mutually connected and disconnected.
Further, an exhaust pipe is connected to the first gas storage mechanism, and a valve is mounted on the exhaust pipe.
Further, before the gas detection system is used for detection, the first gas detection mechanism and the second gas detection mechanism are calibrated in advance, and the specific calibration process comprises the following steps: and respectively introducing standard gas with known concentration C into the first gas detection mechanism and the second gas detection mechanism for detection, obtaining a response signal S1 of the standard gas with known concentration C of the first gas detection mechanism and a response signal S2 of the standard gas with known concentration C of the second gas detection mechanism, and then calculating a correlation coefficient K1 between the response signal of the first gas detection mechanism and the gas concentration and a correlation coefficient K2 between the response signal of the second gas detection mechanism and the gas concentration, wherein K1 is S1/C, and K2 is S2/C.
Further, the gas detection system adopts a correction working mode, and the specific implementation manner of the correction working mode is as follows: when the gas detection system has a detection condition with C2 as a final detection result, the C1 and C2 in the detection condition are used for correcting K1, namely K1 'is used for replacing K1, and K1' ═ C1 × K1/C2 serves as the basis of the next detection.
Further, the gas detection system is self-calibrated at intervals, and the specific implementation manner of self-calibration is as follows: collecting a gas sample, respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 'of the first gas detection mechanism and a detection concentration result value C2' of the second gas detection mechanism, and then correcting K1 by using C1 'and C2', namely using a correction value K1 'to replace K1, and using the correction value K1' -C1 '. K1/C2' as a subsequent detection basis.
The invention has the beneficial effects that:
The gas detection method provided by the invention detects through two gas detection mechanisms with different detection principles, can correct the detection result deviation of one gas detection mechanism in real time by using the detection result of the other gas detection mechanism through the design judgment step, thereby ensuring higher detection accuracy.
The gas detection system works based on the gas detection method, so that the gas detection system has the advantages of stability, reliability and high accuracy.
Drawings
FIG. 1 is a schematic structural diagram of a gas detection system according to an embodiment of the present invention.
FIG. 2 is a schematic diagram of the operation of a gas detection system according to an embodiment of the present invention.
the components in the drawings are labeled as follows: the device comprises a sampling pipe 1, a gas detection mechanism I2, a gas detection mechanism II 3, a gas storage mechanism I4, a gas storage mechanism II 5, an ozone generation mechanism 6, a reaction chamber 7, a valve array I8, a valve array II 9, an emptying pipe 10, an ozone generation mechanism inlet pipe 11, a filtering mechanism 12, a connecting pipe 13, an exhaust pipe 14, a valve 15, a flow regulating valve 16, a pressure sensor 17, a flow rate sensor 18, a pump I19, a pump II 20, a pump III 21 and a humidity balance mechanism 22.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The embodiments and features of the embodiments in the present application may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
it should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
in addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, "a plurality" means two or more. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
the gas detection method adopts a first gas detection mechanism and a second gas detection mechanism which have different detection principles, and comprises the following steps:
(1) Analysis of
collecting a gas sample, and respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism;
(2) judgment of
Calculating the result difference value deltaC and the result percentage difference value&C，△C＝∣C1-C2∣，Comparing the delta C with a preset result difference judgment value A,&C is compared with a preset result percentage difference value judgment value B, and if the result percentage difference value B meets the condition that deltaC is less than or equal to A and/or&C is less than or equal to B, taking C1 as a final detection result, and if Δ C > A and&C > B, and C2 is taken as the final detection result.
The gas detection method provided by the invention detects through two gas detection mechanisms with different detection principles, can correct the detection result deviation of one gas detection mechanism in real time by using the detection result of the other gas detection mechanism through the design judgment step, thereby ensuring higher detection accuracy.
The preset result difference judgment value a and the preset result percentage difference judgment value B can be selected according to the gas components to be detected, as long as the accuracy of the result can be ensured, and the following provides a better selection range of judgment values of several common gases:
For Nitric Oxide (NO), A is 3ppb to 10ppb, B is 5% to 20%;
For hydrogen sulfide (H)2S), A is 3ppb to 10ppb, B is 5 percent to 20 percent;
for carbon monoxide (CO), A is 0.1ppm to 2ppm, B is 5 percent to 20 percent;
For hydrogen (H)2) 0.1ppm to 2ppm of A and 5 percent to 20 percent of B;
For methane (CH)4) The A is 0.1ppm to 2ppm, and the B is 5 percent to 20 percent.
according to the gas detection method, the invention provides a gas detection system working based on the method, and the following description of the gas detection system of the invention refers to fig. 1 and fig. 2.
The gas detection system of the invention obviously comprises a first gas detection mechanism 2 and a second gas detection mechanism 3 which have different detection principles. The gas detection system works based on the gas detection method, so that the gas detection system has the advantages of stability, reliability and high accuracy. The measurement method is described with reference to the measurement flow in FIG. 2 and the gas detection method of the present invention described above.
Preferably, the first gas detection mechanism adopts an electrochemical detection principle, and the second gas detection mechanism adopts a chemiluminescence detection principle. In the process of implementing the invention, the inventor finds that the electrochemical detection is corrected by the chemiluminescence detection method, and the electrochemical detection method is most suitable, and has more reliable correction effect and higher accuracy.
In specific implementation, the first gas detection mechanism can adopt an MNO-LO type sensor of CityTech or an NO/C-1 type sensor of Membrapor, and the second gas detection mechanism can adopt a 42i type trace nitrogen oxide analyzer of ThermoFisher or i11 NO-NO of Beijing, Zhang science and technology, Inc2-a NOx analyzer.
In an embodiment, before the gas detection system is used for detection, the gas detection mechanism one 2 and the gas detection mechanism two 3 are calibrated in advance, and the specific process of calibration is as follows: standard gas with known concentration C (concentration C is based on the component to be detected) is respectively introduced into the gas detection mechanism one 2 and the gas detection mechanism two 3 for detection, a response signal S1 of the standard gas with known concentration C of the gas detection mechanism one 2 and a response signal S2 of the standard gas with known concentration C of the gas detection mechanism two 3 are obtained, and then a correlation coefficient K1 between the response signal of the gas detection mechanism one 2 and the gas concentration and a correlation coefficient K2 between the response signal of the gas detection mechanism two 3 and the gas concentration are calculated, wherein K1 is S1/C, and K2 is S2/C. Calibration is a necessary step required by most existing gas detection mechanisms, and subsequent detection results are obtained by carrying out reverse extrapolation on correlation coefficients and response signals.
In one embodiment, the gas detection system adopts a correction operation mode, and the specific implementation manner of the correction operation mode is as follows: when the gas detection system has a detection condition with C2 as a final detection result, the C1 and C2 in the detection condition are used for correcting K1, namely K1 'is used for replacing K1, and K1' ═ C1 × K1/C2 serves as the basis of the next detection. When the detection condition with C2 as the final detection result occurs, the drift of the gas detection mechanism is shown, and because the invention adopts the correction working mode, the correction value K1' is used for replacing K1 when the drift occurs, thus the system can be calibrated in real time, the drift phenomenon generated in the long-term use process can be reduced, and the stability of the long-term use is ensured.
In one embodiment, the gas detection system is self-calibrated at intervals (the time interval is determined as required), and the self-calibration is implemented by: collecting a gas sample, respectively introducing the gas sample into a first gas detection mechanism 2 and a second gas detection mechanism 3 for detection to obtain a detection concentration result value C1 'of the first gas detection mechanism 2 and a detection concentration result value C2' of the second gas detection mechanism 3, and then correcting K1 by using C1 'and C2', namely using a correction value K1 'to replace K1, wherein the correction value K1' is C1 '. K1/C2' as a subsequent detection basis. The calibration of the gas detection system by using the standard gas provided by the standard qualification company is the most authoritative and accurate method, but the standard gas is stored in a vacuum steel cylinder and is difficult to be used at a client in time, the first gas detection mechanism is easily influenced by the temperature and the humidity of the environment due to the characteristics of chemical analysis, fluctuation is possible in each period of time, the second gas detection mechanism can maintain long-time stability only by using high-concentration standard gas for periodic calibration every year, and the cost and the time of the traditional calibration process can be greatly reduced by using the self-calibration method.
In an embodiment, the gas detection system further includes a gas sampling mechanism, a gas storage mechanism one 4 and a gas storage mechanism two 5, the gas inlet of the gas storage mechanism one 4 and the gas inlet of the gas storage mechanism two 5 are respectively communicated with the gas outlet of the gas sampling mechanism, the gas outlet of the gas storage mechanism one 4 is communicated with the gas detection mechanism one 2, and the gas outlet of the gas storage mechanism two 5 is communicated with the gas detection mechanism two 3. The design can guarantee that the gas sample entering the first gas storage mechanism and the second gas storage mechanism is the same, so that the reliability of a test correction result is guaranteed, in addition, the gas sample is cached in the first gas storage mechanism and the second gas storage mechanism before entering the first gas detection mechanism and the second gas detection mechanism, the sufficient gas sample can be guaranteed to be detected, and the gas detection device is more stable and reliable, is designed like the design, and is simple in structure and convenient to operate. In specific implementation, the first and second gas storage mechanisms can adopt any container with an inner cavity for storing gas.
In an embodiment, the gas detection system further comprises an ozone generation mechanism 6, the second gas detection mechanism 3 adopts a chemiluminescence method detection principle, a reaction chamber 7 is connected between the gas outlet of the second gas storage mechanism 5 and the second gas detection mechanism 3, and the gas outlet of the ozone generation mechanism 6 is communicated with the reaction chamber 7. The chemiluminescence method detects the principle and needs to use ozone, therefore, under this kind of embodiment, needs to dispose ozone and takes place the mechanism, and ozone that ozone takes place the mechanism and produces is in the reacting chamber with gaseous sample effect, later gets into and detects in the gaseous detection mechanism two, can guarantee to detect the accuracy, designs like this moreover, simple structure, convenient operation.
In one embodiment, an exhaust pipe 14 is connected to the first gas storage mechanism 4, and a valve 15 is installed on the exhaust pipe 14. By the design, when a gas sample enters the first gas storage mechanism, the valve is opened, so that the original gas in the first gas storage mechanism can be discharged through the exhaust pipe, and the interference detection is prevented. In the specific implementation, the valve 15 can be a check valve or a stop valve.
In one embodiment, the sampling tube 1 is provided with a flow regulating valve 16, a pressure sensor 17 and a flow rate sensor 18. The flow regulating valve is used for regulating the flow of a gas sample in a proper range, the pressure sensor and the flow rate sensor are used for monitoring the pressure and the flow rate of the gas sample, only the gas sample meeting the requirements is allowed to be introduced into the gas storage mechanism I and the gas storage mechanism II, and the gas sample not meeting the requirements is discharged into the atmosphere (according to the stipulation in the technical standard guideline for online and offline measurement of nitric oxide exhaled from the respiratory tract and the nose in 2005 of the American Thoracic Society (ATS) and the European Respiratory Society (ERS), the collection of the sample gas for detecting the nitric oxide exhaled gas needs to meet the requirements that the expiratory flow is 50 +/-5 ml/s, and the expiratory pressure is more than or equal to 5cmH2O, so that the test result can be judged by applying the unified standard).
In one embodiment, a humidity balance mechanism 22 is connected between the gas storage mechanism 4 and the gas detection mechanism 2. Humidity balance mechanism is used for adjusting the humidity of gaseous sample, and the testing result of gaseous detection mechanism one receives sample gas humidity to influence very big, balances the humidity of gas through humidity balance mechanism before gaseous detection mechanism one at every turn gets into, if humidity is greater than when environmental humidity, then dehumidifies sample gas, if humidity is less than when environmental humidity, then humidifies sample gas.
In one embodiment, the gas detection system further comprises an emptying pipe 10 and an ozone generating mechanism inlet pipe 11, a filtering mechanism 12 is installed on the ozone generating mechanism inlet pipe 11, the gas sampling mechanism comprises a sampling pipe 1, an air outlet of the sampling pipe 1 is communicated with an air inlet of a gas storage mechanism I4 and an air inlet of a gas storage mechanism II 5 through a valve array I8, an air outlet of the ozone generating mechanism inlet pipe 11 is communicated with an air inlet of an ozone generating mechanism 6 and an air inlet of the emptying pipe 10 through a valve array II 9, and the valve array I8 is communicated with the valve array II 9 through a connecting pipe 13;
The valve array 8 is controllable the gas outlet of sampling pipe 1, the air inlet of gas storage mechanism 4, the air inlet of gas storage mechanism two 5 and the break-make between linking pipe 13 each other, valve array two 9 is controllable the gas outlet of ozone generation mechanism intake pipe 11, the air inlet of ozone generation mechanism 6, the air inlet of evacuation pipe 10 and the break-make between linking pipe 13 each other.
The air inlet pipe of the ozone generating mechanism is arranged for introducing raw material gas, specifically air, into the ozone generating mechanism, and the arranged filtering mechanism is used for filtering moisture, dust and substances to be detected (NO, CO and the like) in the air so as to avoid the interference of generating ozone and detecting;
The emptying pipe is arranged and all the parts are connected through the first valve array and the second valve array, so that the use is more convenient, for example, when a gas sample collected by the sampling pipe does not meet the requirement, only the gas outlet of the sampling pipe is communicated with the connecting pipe through the first valve array, other parts based on the first valve array are mutually cut off, only the connecting pipe is communicated with the gas inlet of the emptying pipe through the second valve array, other parts based on the second valve array are mutually cut off, and thus the gas sample which does not meet the requirement can be sequentially discharged into the atmosphere through the connecting pipe and the emptying pipe;
In addition, for most gas detection mechanisms, the response signal of the gas to be detected is obtained based on a blank control of a blank gas containing no gas to be detected, for example, the detection signal of the gas to be detected with the concentration of C is SCthe detection signal of the blank gas not containing the gas to be measured is S0If the response signal S of the gas to be measured with the concentration C is SC-S0and blank gas can be conveniently collected through the design, specifically, through the valve array I, only the connecting pipe is communicated with the gas inlet of the gas storage mechanism I and the gas inlet of the gas storage mechanism II, other parts based on the valve array I are mutually cut off, through the valve array II, only the gas outlet of the ozone generation mechanism gas inlet pipe is communicated with the connecting pipe, other parts based on the valve array II are mutually cut off, air after filtration is blank gas, enters the gas storage mechanism I and the gas storage mechanism II through the connecting pipe, and is detected to obtain S0。
The gas detection system can sample gas exhaled from the gas inlet of the sampling pipe, or can collect a gas sample into the gas bag firstly, then connect the gas bag with the gas inlet of the sampling pipe, and extract the gas sample from the gas bag during testing.
When the breath is sampled, the breath has a certain flow rate, so that equipment for providing gas flow power, such as a pump, does not need to be arranged in the system, and the breath can directly flow to the first gas detection mechanism and the second gas detection mechanism.
If the collected gas sample has no flow rate, for example, the gas bag sampling method, a pump or other devices capable of providing gas flow power need to be arranged on the corresponding channel, so as to introduce the gas sample into the first gas detection mechanism and the second gas detection mechanism. For example, in one implementation, a first pump 19 is connected between the first gas storage mechanism 4 and the first gas detection mechanism 2, a second pump 20 is connected between the second valve array 9 and the gas inlet of the ozone generating mechanism 6, and a third pump 21 is further included, and the gas inlet of the third pump 21 is communicated with the first gas storage mechanism 4. The first pump is used for pumping the gas sample in the first gas storage mechanism into the first gas detection mechanism, the second pump is used for pumping air into the ozone generation mechanism, meanwhile, the ozone generation mechanism is communicated with the reaction chamber, so that the gas sample can be squeezed into the second gas detection mechanism, and the third pump is used for sampling, can pump the gas sample in the gas bag into the first gas storage mechanism and simultaneously squeeze the gas sample into the second gas storage mechanism.
Taking the gas detection system of one embodiment shown in fig. 1 as an example, the following general description is provided for its usage:
When sampling is expired, the pump III is closed, the valve is opened, the valve gate array I is switched, the sampling pipe is kept communicated with the gas storage mechanism I and the gas storage mechanism II, the expired gas which meets the requirements and is adjusted by the flow regulating valve enters the gas storage mechanism I and the gas storage mechanism II, the valve is closed again, the pump I and the pump II are opened, the valve gate array II is switched, the ozone generating mechanism air inlet pipe is kept communicated with the ozone generating mechanism, and thus the gas sample stored in the gas storage mechanism I enters the gas detection mechanism I to obtain a detection signal S1 of the gas to be detected of the gas detection mechanism IGeneral assemblyThe gas sample stored in the gas storage mechanism II and the ozone generated by the ozone generating mechanism enter the reaction chamber and then enter the gas detection mechanism II to obtain a detection signal S2 of the gas to be detected of the gas detection mechanism IIGeneral assemblyAfter detection is finished, the first switching valve array and the second switching valve array keep the air inlet pipe of the ozone generating mechanism communicated with the first gas storage mechanism and the second gas storage mechanism, blank air obtained by filtering through the filtering mechanism enters the first gas storage mechanism and the second gas storage mechanism, and then the operation is carried out in the same way to obtain a detection signal S1 of the blank air of the first gas detection mechanism0The detection signal S2 of blank air of the second gas detection mechanism0Finally, the response signal S1 ═ S1 of the gas to be detected of the first gas detection mechanism is obtainedGeneral assembly-S10The response signal S2 ═ S2 of the gas to be detected in the gas detection mechanism twoGeneral assembly-S20；
When the air bag is used for air suction and sampling, the valve is normally closed, the pump III is opened, the air enters the storage mechanism I and the storage mechanism II, when in detection, the pump III is closed, and the detection step is the same as the expiration sampling step.
Of course, the specific detection sequence may be adjusted as long as S1 can be detectedGeneral assembly、S10、S2general assembly、S20And (4) finishing.
In specific implementation, the filtering mechanism can adopt active carbon or potassium permanganate loaded by alumina, the humidity balancing mechanism can adopt a nafion tube of Perma Pure in the United states, and the ozone generating mechanism can adopt ozone fittings KS-3G of Wangli (Foshan) environmental protection technology company Limited.
the main function of the first valve array and the second valve array is to switch on and off of the components, gas samples collected by the sampling pipe and meeting the requirements are led into the first gas storage mechanism and the second gas storage mechanism, the gas samples collected by the sampling pipe and not meeting the requirements are discharged into the atmosphere through the emptying pipe, filtered gas obtained by the air inlet pipe of the ozone generation mechanism is led into the ozone generation mechanism to generate ozone, and filtered gas obtained by the air inlet pipe of the ozone generation mechanism is led into the first gas storage mechanism and the second gas storage mechanism as blank gas.
The correction operation mode of the present invention may perform the following operations as the data amount is accumulated:
(1) Obtaining a prior model database through calibration, wherein the process comprises the following steps: recording result values C1 and result values C2 corresponding to standard gases with different known concentrations and analysis parameters K1 of the gas detection mechanism 1 under different temperature and humidity conditions to form a standard gas result database; recording result values C1 and C2 corresponding to different exhalation values and analysis parameters K1 of the gas detection mechanism 1 under different temperature and humidity conditions, forming a test result database, calculating environmental temperature T (T), environmental humidity RH (T), result values C1(T), result values C2(T) and analysis parameters K1(T) of the gas detection mechanism 1 during real-time detection, and carrying out functional relation f between the environmental temperature T (0), the environmental humidity RH (0) and the initial analysis parameters K1 (0);
(2) The result value C1(t) is calculated by the environmental temperature T (t), the environmental humidity RH (t), the initial analysis parameter K1(0) and the functional relation f thereof in each detection, the result value is compared with the result value C2(t), whether the difference value of the two result values exceeds +/-Appb or +/-B percent is judged, if the difference value does not exceed the range, the calculation is successful, C1(t) is displayed, if the difference value exceeds the range, the calculation is failed, the final result displays the result value C2(t), the result record is put into another classifier, the failed data is subjected to reinforcement learning, the relevant characteristics of the failed data are learned, and the classifier and the existing function determine the result value C1 (t).
Taking the electrochemical detection principle adopted by the first gas detection mechanism, the chemiluminescence detection principle adopted by the second gas detection mechanism, and the component to be detected is Nitric Oxide (NO), as an example, the accuracy of the invention is verified by using the standard gas concentration, and the results are shown in the following tables 1 and 2:
TABLE 1
TABLE 2
as can be seen from tables 1 and 2, the detection result deviation of the electrochemical detection mechanism is corrected in real time through the chemiluminescence detection mechanism, the accuracy is high, and the high detection accuracy can be ensured.
It should be understood that the examples and embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present disclosure, and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this disclosure.
Claims (10)
1. A method of gas detection, characterized by: adopt the different gaseous detection mechanism of detection principle and gaseous detection mechanism two, include the following steps:
(1) Analysis of
Collecting a gas sample, and respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 of the first gas detection mechanism and a detection concentration result value C2 of the second gas detection mechanism;
(2) Judgment of
Calculating the result difference value deltaC and the result percentage difference value&C，△C＝∣C1－C2∣，Comparing the delta C with a preset result difference judgment value A,&C is compared with a preset result percentage difference value judgment value B, and if the result percentage difference value B meets the condition that deltaC is less than or equal to A and/or&C is less than or equal to B, taking C1 as a final detection result, and if Δ C > A and&C > B, and C2 is taken as the final detection result.
2. The gas detection method of claim 1, wherein: the first gas detection mechanism adopts an electrochemical detection principle, and the second gas detection mechanism adopts a chemiluminescence detection principle.
3. a gas detection system operating on the basis of the gas detection method according to claim 1 or 2, characterized in that: the gas detection device comprises a first gas detection mechanism and a second gas detection mechanism which have different detection principles.
4. The gas detection system of claim 3, wherein: the gas sampling device is characterized by further comprising a gas sampling mechanism, a first gas storage mechanism and a second gas storage mechanism, wherein the gas inlet of the first gas storage mechanism and the gas inlet of the second gas storage mechanism are communicated with the gas outlet of the gas sampling mechanism respectively, the gas outlet of the first gas storage mechanism is communicated with the first gas detection mechanism, and the gas outlet of the second gas storage mechanism is communicated with the second gas detection mechanism.
5. The gas detection system of claim 4, wherein: still include ozone generation mechanism, gaseous detection mechanism two adopts the chemiluminescence method to detect the principle, the gas outlet of gaseous storage mechanism two with be connected with the reaction chamber between the gaseous detection mechanism two, the gas outlet of ozone generation mechanism with the reaction chamber intercommunication.
6. the gas detection system of claim 5, wherein: the gas sampling mechanism comprises a sampling pipe, a gas outlet of the sampling pipe is communicated with a gas inlet of the first gas storage mechanism and a gas inlet of the second gas storage mechanism through a first valve array, a gas outlet of the ozone generating mechanism gas inlet pipe is communicated with a gas inlet of the ozone generating mechanism and a gas inlet of the emptying pipe through a second valve array, and the first valve array is communicated with the second valve array through a connecting pipe;
The first valve array is controllable, the gas outlet of the sampling pipe, the gas inlet of the first gas storage mechanism, the gas inlet of the second gas storage mechanism and the connection pipe are mutually connected and disconnected, the second valve array is controllable, the gas outlet of the ozone generation mechanism gas inlet pipe, the gas inlet of the ozone generation mechanism, the gas inlet of the emptying pipe and the connection pipe are mutually connected and disconnected.
7. the gas detection system of claim 4, wherein: and the first gas storage mechanism is connected with an exhaust pipe, and a valve is installed on the exhaust pipe.
8. the gas detection system of any one of claims 3 to 7, wherein: before the gas detection system is used for detection, the first gas detection mechanism and the second gas detection mechanism are calibrated in advance, and the specific calibration process comprises the following steps: and respectively introducing standard gas with known concentration C into the first gas detection mechanism and the second gas detection mechanism for detection, obtaining a response signal S1 of the standard gas with known concentration C of the first gas detection mechanism and a response signal S2 of the standard gas with known concentration C of the second gas detection mechanism, and then calculating a correlation coefficient K1 between the response signal of the first gas detection mechanism and the gas concentration and a correlation coefficient K2 between the response signal of the second gas detection mechanism and the gas concentration, wherein K1 is S1/C, and K2 is S2/C.
9. The gas detection system of claim 8, wherein: the gas detection system adopts a correction working mode, and the specific implementation mode of the correction working mode is as follows: when the gas detection system has a detection condition with C2 as a final detection result, the C1 and C2 in the detection condition are used for correcting K1, namely K1 'is used for replacing K1, and K1' ═ C1 × K1/C2 serves as the basis of the next detection.
10. The gas detection system of claim 8, wherein: the gas detection system is self-calibrated at intervals, and the self-calibration specific implementation mode is as follows: collecting a gas sample, respectively introducing the gas sample into a first gas detection mechanism and a second gas detection mechanism for detection to obtain a detection concentration result value C1 'of the first gas detection mechanism and a detection concentration result value C2' of the second gas detection mechanism, and then correcting K1 by using C1 'and C2', namely using a correction value K1 'to replace K1, and using the correction value K1' -C1 '. K1/C2' as a subsequent detection basis.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758892A (en) * | 2021-10-15 | 2021-12-07 | 北方民族大学 | Coal mine production data screening method based on big data analysis |
| CN117191928A (en) * | 2023-08-08 | 2023-12-08 | 广州科易光电技术有限公司 | Gas leakage detection method, device, electronic equipment and storage medium |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002148193A (en) * | 2000-11-07 | 2002-05-22 | Shimadzu Corp | Chemiluminescence type nitrogen oxide concentration meter |
| US20040082872A1 (en) * | 2002-09-16 | 2004-04-29 | Pontus Von Bahr | Apparatus and method for diagnostic gas analysis |
| CN101547638A (en) * | 2006-12-04 | 2009-09-30 | Ric投资有限责任公司 | Compensation of volumetric errors in a gas monitoring system |
| CN105842234A (en) * | 2016-05-11 | 2016-08-10 | 四川理工学院 | Self-calibration continuous and online nitrogen dioxide detection device and method |
| CN106053437A (en) * | 2016-05-05 | 2016-10-26 | 苏州市江海通讯发展实业有限公司 | A device detecting NO through chemiluminescence and a detecting method thereof |
| CN108037115A (en) * | 2017-12-08 | 2018-05-15 | 陕西理工大学 | A kind of sulfur dioxide detecting system and detection method |
| CN109211884A (en) * | 2018-11-08 | 2019-01-15 | 广西玉柴机器股份有限公司 | A kind of chemiluminescent analyzer NOx conversion efficiency rapid detection method |
| CN110031454A (en) * | 2019-05-06 | 2019-07-19 | 中山大学 | A kind of the cyclic chemical luminescence detection apparatus and method of quick identification complex sample |
| CN210742134U (en) * | 2019-10-18 | 2020-06-12 | 合肥美钛健康产业有限公司 | Gas detection system |
-
2019
- 2019-10-18 CN CN201910991947.6A patent/CN110554028B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002148193A (en) * | 2000-11-07 | 2002-05-22 | Shimadzu Corp | Chemiluminescence type nitrogen oxide concentration meter |
| US20040082872A1 (en) * | 2002-09-16 | 2004-04-29 | Pontus Von Bahr | Apparatus and method for diagnostic gas analysis |
| CN102188247A (en) * | 2002-09-16 | 2011-09-21 | 艾罗克林有限公司 | Apparatus and method for diagnostic gas analysis |
| CN101547638A (en) * | 2006-12-04 | 2009-09-30 | Ric投资有限责任公司 | Compensation of volumetric errors in a gas monitoring system |
| CN106053437A (en) * | 2016-05-05 | 2016-10-26 | 苏州市江海通讯发展实业有限公司 | A device detecting NO through chemiluminescence and a detecting method thereof |
| CN105842234A (en) * | 2016-05-11 | 2016-08-10 | 四川理工学院 | Self-calibration continuous and online nitrogen dioxide detection device and method |
| CN108037115A (en) * | 2017-12-08 | 2018-05-15 | 陕西理工大学 | A kind of sulfur dioxide detecting system and detection method |
| CN109211884A (en) * | 2018-11-08 | 2019-01-15 | 广西玉柴机器股份有限公司 | A kind of chemiluminescent analyzer NOx conversion efficiency rapid detection method |
| CN110031454A (en) * | 2019-05-06 | 2019-07-19 | 中山大学 | A kind of the cyclic chemical luminescence detection apparatus and method of quick identification complex sample |
| CN210742134U (en) * | 2019-10-18 | 2020-06-12 | 合肥美钛健康产业有限公司 | Gas detection system |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113758892A (en) * | 2021-10-15 | 2021-12-07 | 北方民族大学 | Coal mine production data screening method based on big data analysis |
| CN117191928A (en) * | 2023-08-08 | 2023-12-08 | 广州科易光电技术有限公司 | Gas leakage detection method, device, electronic equipment and storage medium |
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