CN107192791A - A kind of gas analyzing apparatus and method - Google Patents
A kind of gas analyzing apparatus and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000007789 gas Substances 0.000 claims abstract description 240
- 239000001301 oxygen Substances 0.000 claims abstract description 32
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 32
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 31
- 239000003085 diluting agent Substances 0.000 claims abstract description 9
- 238000004868 gas analysis Methods 0.000 claims description 64
- 238000002156 mixing Methods 0.000 claims description 34
- 238000010790 dilution Methods 0.000 claims description 25
- 239000012895 dilution Substances 0.000 claims description 25
- 230000001105 regulatory effect Effects 0.000 claims description 22
- 238000005086 pumping Methods 0.000 claims description 11
- 238000001914 filtration Methods 0.000 claims description 8
- 238000012937 correction Methods 0.000 claims description 4
- 239000012159 carrier gas Substances 0.000 claims description 2
- 238000004458 analytical method Methods 0.000 abstract description 11
- 238000005259 measurement Methods 0.000 abstract description 9
- 239000000470 constituent Substances 0.000 abstract 2
- 230000003679 aging effect Effects 0.000 abstract 1
- 230000002035 prolonged effect Effects 0.000 abstract 1
- 239000000523 sample Substances 0.000 description 68
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 32
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 31
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 25
- 238000012360 testing method Methods 0.000 description 9
- 238000007791 dehumidification Methods 0.000 description 4
- 238000003113 dilution method Methods 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000009833 condensation Methods 0.000 description 3
- 230000005494 condensation Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 238000007865 diluting Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- DBTDEFJAFBUGPP-UHFFFAOYSA-N Methanethial Chemical compound S=C DBTDEFJAFBUGPP-UHFFFAOYSA-N 0.000 description 2
- 238000004364 calculation method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 229920000557 Nafion® Polymers 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- HRKQOINLCJTGBK-UHFFFAOYSA-N dihydroxidosulfur Chemical compound OSO HRKQOINLCJTGBK-UHFFFAOYSA-N 0.000 description 1
- 239000012470 diluted sample Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N35/1095—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices for supplying the samples to flow-through analysers
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N2035/1027—General features of the devices
- G01N2035/1032—Dilution or aliquotting
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N35/00—Automatic analysis not limited to methods or materials provided for in any single one of groups G01N1/00 - G01N33/00; Handling materials therefor
- G01N35/10—Devices for transferring samples or any liquids to, in, or from, the analysis apparatus, e.g. suction devices, injection devices
- G01N2035/1027—General features of the devices
- G01N2035/1048—General features of the devices using the transfer device for another function
- G01N2035/1058—General features of the devices using the transfer device for another function for mixing
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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
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Abstract
The present invention provides a kind of gas analyzing apparatus and method, by setting the sample gas acquisition channel with oxygen sensor all the way, air acquisition passage with gas flowmeter all the way, and two passages are mixed to form mixed-gas channel more than, gas flowmeter and diluent gas constituent analysis unit are set in mixed-gas channel, the thinner ratio of sample gas is calculated by the gas flowmeter information of air and diluent gas, or use the thinner ratio of the oxygen sensor calculating sample gas of sample gas and diluent gas to calculate the gas componant for obtaining sample gas by thinner ratio and the constituent analysis information of diluent gas.The device is very suitable for being tested gas to gas sensor aging effects very big application scenario (such as measurement of the biogas fields of measurement to H2S) containing high-moisture and some high concentrations, this method can remove the pretreatment system of conventional complexity from, it is with low cost, while the service life of instrument can be greatly prolonged.
Description
Technical Field
The invention belongs to the technical field of gas detection and analysis, and relates to a gas component analysis device and a gas component analysis method.
Background
In the field of online analysis of gas components, it is generally necessary to consider the effect of moisture elimination on the reliability and accuracy of the analysis system. High moisture can cause icing and blockage of the entire pipeline in winter, requiring additional automatic heating and insulation systems to ensure proper operation of the system. High moisture also tends to cause condensation of the moisture to form water droplets, causing damage to the components of the instrument. Therefore, it is generally necessary to remove as much moisture as possible before the sample gas enters the gas component analysis system, and for example, a water cooling dehumidification technique, a refrigerator dehumidification technique, a scroll refrigeration dehumidification technique, a Nafion membrane type gas drying dehumidification technique, or the like is employed. These pretreatments not only increase system costs, but are also a major source of future operational failures.
In addition, in some application fields, the service life of the sensor is very short or accurate measurement can only be realized by using a very expensive gas analysis technology due to the fact that a certain gas in a high-concentration original sample gas is too high in concentration. For example, in the measurement of biogas components, if the gas components to be measured contain high-concentration H2S (up to 10000PPM), the electrochemical H2S sensor is usually used for measurement, and when the high-concentration high-range H2S is measured, the service life of the electrochemical sensor is even only a few weeks, so that the on-line non-real-time measurement can be realized only by using a special device and adopting a batch method, for example, document CN202661435U, proposes a device for prolonging the service life of a hydrogen sulfide electrochemical sensor, and adjusts the time for respectively introducing hydrogen sulfide gas and air into the hydrogen sulfide electrochemical sensor according to the use requirement of the hydrogen sulfide electrochemical sensor, so as to avoid the loss of the hydrogen sulfide gas introduced into the hydrogen sulfide electrochemical sensor for the measurement of the concentration of the hydrogen sulfide gas to the sensor, but the method can not effectively avoid the loss of the sensor during the measurement of the hydrogen sulfide gas, and the corrosion during the test is also enhanced, the service life of the gas analyzer is shortened, the gas sensor needs to be replaced frequently, and real-time online measurement cannot be realized.
Disclosure of Invention
The invention relates to a gas analysis device based on a dilution method, which is used for indirectly measuring the composition of gas. The measured gas and the air are mixed according to a certain proportion so as to achieve the purpose of diluting the measured gas. After the measured gas is diluted, the dew point temperature of the diluted gas can be lower than the on-site environment temperature, so that the measured gas can not be condensed in the analysis process, the interference of moisture condensation on a gas analysis system can be effectively avoided, and the diluted gas can obviously prolong the service life of the measuring sensor or can use an anti-interference low-cost sensor. The dilution ratio can be obtained through information of the air gas flowmeter and the mixed gas flowmeter, and the dilution ratio can also be obtained through an oxygen sensor of the sample gas and an oxygen sensor of the mixed gas. After dilution, the diluted gas detection and analysis unit can adopt a long-life or anti-interference low-cost gas sensor to detect, and the concentration of each component in the original sample gas can be obtained through the detection result and the dilution ratio.
The technical scheme adopted by the invention is as follows:
a gas analysis apparatus, characterized in that: the method comprises the following steps: the gas sampling device comprises an air collecting channel, a sample gas collecting channel and a mixed gas channel which is communicated with the air collecting channel and the sample gas collecting channel. Wherein,
an air collection channel: comprises an air inlet, an air suction device, an air inlet electromagnetic valve U1, a flow regulating valve V1 and a gas flow meter W1;
a sample gas collection channel: comprises a sample gas inlet, a sample gas pumping device, an oxygen sensor, a gas inlet electromagnetic valve U2 and a flow regulating valve V2;
a mixed gas channel: comprises a gas flowmeter W2, a gas mixing device, a gas analysis unit and a gas mixing device;
a gas analysis apparatus as described above, characterized in that: the air collection channel further comprises an air filtering device, and the air filtering device adopts a HEPA filtering device.
A gas analysis apparatus as described above, characterized in that: the sample gas collection passage further comprises a flame arrester.
A gas analysis apparatus as described above, characterized in that: the air pumping device and the sample air pumping device can be fans or air pumps.
A gas analysis apparatus as described above, characterized in that: the gas flow meters W1 and W2 are ultrasonic gas flow meters.
A gas analysis apparatus as described above, characterized in that: the carrier gas of the gas mixing device is formed by mixing air introduced from the air inlet and sample gas introduced from the sample gas inlet.
A method of gas analysis, comprising the steps of:
step 1: opening an air inlet electromagnetic valve U1, opening a flow regulating valve V1 and starting an air collecting channel;
step 2: air was drawn into the gas mixing apparatus, the flow rate of the reading gas flow meter W1 was F1, the flow rate of the reading gas flow meter W2 was F2:
if F1 ≠ F2, using F1 or F2 as calibration gas flow meter calibration so that F1 ≠ F2, execute step 3;
if F1 is F2, go to step 3;
and step 3: measuring the concentration of a certain component X containing sample gas in the air as C air X through a gas analysis unit;
and 4, step 4: opening the air inlet electromagnetic valve U1, reading a flow value F3 through a gas flowmeter W1, and reading a flow value F4 through a gas flowmeter W2;
and 5: flow data of the gas flow meters W1 and W2 are collected by a gas analysis unit, and a dilution ratio R:
step 6: the R value is determined by adjusting the flow regulating valves V1 and V2, wherein R is more than or equal to N (N is a natural number), so that the diluting gas meets the requirement of a certain diluting proportion;
and 7: the concentration Cx of the diluted gas after mixing is detected by a gas analyzing means for the diluted gas, and the actual concentration Cx' of the gas in the sample gas is calculated from the R value:
Cx′×(F4-F3)+Cempty X×F3＝Cx×F4
Cx′＝R×(Cx-CEmpty X)+CEmpty X
And 8: correcting the concentration:
if C1′+C2′+...+Ci' notequal to 100%, corrected to obtain a gas concentration in the sample gas Px:
……
x is a component in the sample gas, and X is 1, 2 and 3 … … i.
A method of gas analysis, comprising the steps of:
step 1: introducing sample gas from a sample gas inlet: reading the oxygen sensor value A1 of the sample gas channel; reading the gas analysis unit value A2 of the mixed gas channel, and adjusting zero through calibration to make A1 equal to A2 equal to 20.9%;
step 2: air is introduced from the air inlet: opening an air inlet electromagnetic valve U1, adjusting a flow regulating valve V1, extracting air into a gas mixing device, and measuring the concentration of oxygen in the air to be C-air-oxygen which is 20.9% through a gas analysis unit;
and step 3: introducing sample gas from a sample gas inlet: adjust flow control valve V2, start the sample gas and gather the passageway, extract the sample gas to the gas mixing device in, through oxygen sensor, measure oxygen concentration in the sample gas and be C appearance oxygen, gather the oxygen concentration through the gas analysis unit and be C mixed oxygen in the gas mixing device to calculate and dilute than R:
and 4, step 4: the R value is determined by adjusting the flow regulating valves V1 and V2, wherein R is more than or equal to N (N is a natural number), so that the R value meets the requirement of a certain dilution ratio;
and 5: opening an air inlet electromagnetic valve U1, starting an air collecting channel, and measuring the concentration of a certain component X containing sample gas in the air to be C-air X through a gas analysis unit;
step 6: the electromagnetic valve U1 is opened, the mixed sample gas is collected by the gas analysis unit of the dilution passage, the mixed gas concentration Cx can be detected by the gas analysis unit, and the actual concentration Cx' of the gas in the sample gas can be calculated from the dilution ratio R:
Cx′＝R×(CX-Cempty X)+CEmpty X；
And 7: correcting the concentration:
if C1′+C2′+...+Ci' notequal to 100%, corrected to obtain a gas concentration in the sample gas Px:
……
x is a component in the sample gas, and X is 1, 2 and 3 … … i.
Compared with the prior art, the invention has the following advantages: sampling is carried out by a dilution method, the water content of the mixed gas is low, the dew point temperature is lower than the environmental temperature, the influence of the condensation of the water in the sample gas on the accuracy of gas analysis in the analysis process is avoided, a complex pretreatment system is omitted, and the instrument cost and the operation and maintenance cost are reduced; 3. after the high-concentration gas is diluted, the gas component of the diluted mixed gas can be analyzed by using a long-life, anti-interference and low-cost gas sensor, and the concentration of the gas component of the original gas is reduced by the dilution ratio. The method prolongs the service life of the gas sensor; the purchase cost of the instrument is reduced.
Drawings
FIG. 1 is a schematic view of an embodiment of the present invention;
FIG. 2 is a schematic view of a second embodiment of the present invention;
FIG. 3 is a flowchart of an embodiment of the present invention.
FIG. 4 is a flowchart of an embodiment of the present invention.
Detailed Description
Example one
See figure 1: a gas analysis device comprises an air collection channel, a sample gas collection channel and a mixed gas channel;
the air collection channel consists of an air inlet, an air suction device, an air inlet electromagnetic valve U1, a flow regulating valve V1 and a gas flow meter W1; the sample gas collecting channel consists of a sample gas inlet, an air inlet electromagnetic valve U2, an air suction device and a flow regulating valve V2; the mixed gas channel consists of a gas flowmeter W2, a gas mixing device and a gas analysis unit; biogas is in the sample gas collecting channel; the air collection channel may be provided with an air filtration device, which is a HEPA filter. The air pumping device is a fan, and the sample air pumping device is an air pump. The gas flowmeter W1 and the gas flowmeter W2 are ultrasonic gas flowmeters, the accuracy is 1.5 grade, and the range ratio is 1:160
Is formed by mixing air introduced from an air inlet and methane introduced from a sample gas inlet. In this embodiment, gas mixing device is the container that has certain volume and is used for mixing sample gas and air, gets into gas analysis unit through pipe connection, and the volume of container can be confirmed according to actual conditions, and the form of mixing also can be certain length's pipeline, and sample gas and air mix the back rethread pipe connection and get into gas analysis unit in the pipeline.
The gas analysis units are infrared CH4 (0-5%), CO2 (0-5%) gas sensor and electrochemical O2 (0-25%), H2S (0-500ppm) gas sensor.
The gas analysis method applied to the gas analysis device is used for testing the mass concentration of each component in the biogas, and comprises the following steps:
1. opening an air inlet electromagnetic valve U1, opening a flow regulating valve V1 and starting an air collecting channel;
2. extracting air into a gas mixing device, reading the flow rate of a gas flowmeter W1 as F1, reading the flow rate of a gas flowmeter W2 as F2, and calibrating F1 by adopting W2 as a standard to ensure that F1 is equal to F2;
3. closing the air inlet electromagnetic valve U2, opening the air inlet electromagnetic valve U1, starting the air collecting channel, and measuring the content of CH4 in the air to be C by the gas analysis unitEmpty CH4CO2 content of CEmpty CO2H2S content of CEmpty H2SO2 content of CEmpty O2(ii) a In the usual case CEmpty CH4＝0％、CEmpty CO2＝0.04％、CEmpty H2S＝0％、CEmpty O2＝20.9％；：
4. Opening the electromagnetic valve U1, reading a flow value F3 through a gas flowmeter W1, and reading a flow value F4 through a gas flowmeter W2;
5. flow data of the gas flow meters W1 and W2 are collected by a gas analysis unit, and a dilution ratio R:
6. the value of R is adjusted by adjusting the flow adjusting valves V1 and V2, and the R is more than or equal to 20 and less than or equal to 25 to meet the test requirement;
7. the gas analysis unit can detect the concentration C of the mixed gasCH4、CCO2、CH2S、CO2；
8. The actual concentration C 'of the gas in the sample gas can be calculated by the dilution ratio R'CH4、C'CO2、C'H2S、C'O2：
C'CH4＝R×(CCH4-CEmpty CH4)+CEmpty CH4
C'CO2＝R×(CCO2-CEmpty CO2)+CEmpty CO2
C'H2S＝R×(CH2S-CEmpty H2S)+CEmpty H2S
C'O2＝R×(CO2-CEmpty O2)+CEmpty O2；
9. And (3) correcting data:
if C'CH4+C'CO2+C'H2S+C'O2100%, no correction is required;
if C'CH4+C'CO2+C'H2S+C'O2Not equal to 100%, and correcting;
the table is test data obtained according to one method of the example:
watch 1
And calculating according to the test value of the first table to obtain second table data, wherein the calculation process is as follows:
1. calculating the dilution ratioThe test requirements are met;
2. the mixed gas concentration can be detected by the gas analysis unit:
CCH4＝2.73％、CCO2＝1.86％、CH2S＝0.0080％、CO2＝19.97％
3. the actual concentration C 'of the gas in the sample gas can be calculated by the dilution ratio R'CH4、C'CO2、C'H2S、C'O2：
C'CH4＝R×(CCH4-CEmpty CH4)+CEmpty CH4＝59.81％
C'CO2＝R×(CCO2-CEmpty CO2)+CEmpty CO2＝39.92％
C'H2S＝R×(CH2S-CEmpty H2S)+CEmpty H2S＝0.18％
C'O2＝R×(CO2-CEmpty O2)+CEmpty O2＝0.52％
4. And (3) correcting data:
according to C'CH4+C'CO2+C'H2S+C'O2When the total of 59.81% + 39.92% + 0.18% + 0.52% + 100.43% ≠ 100%, it is necessary to correct:
table two: comparison table for concentration of raw material gas and concentration calculated by dilution method
Example two:
see figure 2: a gas analysis device comprises an air collection channel, a sample gas collection channel and a mixed gas channel;
the air collection channel consists of an air inlet, an air suction device, an air inlet electromagnetic valve U1, a flow regulating valve V1 and a gas flow meter W1; the sample gas collecting channel consists of a sample gas inlet, an air inlet electromagnetic valve U2, a sample gas collecting device, an oxygen sensor and a flow regulating valve V2; the mixed gas channel consists of a gas flowmeter W2, a gas mixing device and a gas analysis unit. Biogas is filled in the sample gas channel; the air collection channel may be provided with an air filtration device, which is a HEPA filter. The air pumping device and the sample air pumping device are respectively a fan and an air pump. The gas flow meters W1 and W2 are ultrasonic flow meters.
The gas mixing device is used for preparing diluted sample gas. Is formed by mixing air introduced from an air inlet and methane introduced from a sample gas inlet. In this embodiment, gas mixing arrangement is the container that has certain volume and is used for mixing sample gas and air, gets into gas analysis device through pipe connection, and the volume of container can be confirmed according to actual conditions, and the form of mixing also can be certain length's pipeline, and sample gas and air mix the back rethread pipe connection and get into gas analysis device in the pipeline.
The gas analysis units are infrared CH4 (0-5%), CO2 (0-5%) gas sensor and electrochemical O2 (0-25%), H2S (0-500 ppm).
The gas analysis method applied to the gas analysis device is used for testing the mass concentration of each component in the biogas, and comprises the following steps:
1. introducing sample gas from a sample gas inlet: reading the oxygen sensor value A1 of the sample gas channel; reading the gas analysis unit value A2 of the mixed gas channel, and adjusting zero through calibration to make A1 equal to A2 equal to 20.9%;
2. air is introduced from the air inlet: opening the air inlet electromagnetic valve U1, adjusting the flow regulating valve V1, pumping the air into the gas mixing device, and measuring the oxygen concentration in the air as C through the gas analysis unitAir oxygen＝20.9％，CEmpty CH4＝0％、CEmpty CO2＝0.04％、CEmpty H2S＝0％；
3. Introducing sample gas from a sample gas inlet: adjusting a flow regulating valve V2, starting a sample gas collecting channel, extracting the sample gas into a gas mixing device, and measuring the oxygen concentration in the sample gas to be C through an oxygen sensorSample oxygenCollecting oxygen concentration C in the gas mixing device through the gas analysis unitOxygen mixingAnd calculating the dilution ratio R:
4. the value of R is determined by adjusting the flow regulating valves V1 and V2, wherein m is more than or equal to R and less than or equal to n (m and n are natural numbers), so that the diluent gas reaches a certain dilution ratio;
5. opening an air inlet electromagnetic valve U1, starting an air collecting channel, and measuring the concentration of a certain component X containing sample gas in the air to be C through a gas analysis unitEmpty X；
6. Opening the electromagnetic valve U1, collecting the mixed sample gas by the gas analysis unit of the dilution passage, and detecting the concentration C of the mixed gas by the gas analysis unitxCalculating the gas in the sample gas according to the dilution ratio RActual concentration of body Cx′：
Cx′＝R×(CX-CEmpty X)+CEmpty X；
7. Correcting the concentration:
if C1′+C2′+...+Ci' notequal to 100%, and the gas concentration in the sample gas after correction is Px:
……
X is a component in the sample gas, and X is 1, 2 and 3 … … i.
Table three is the test data obtained according to the method of example two:
watch III
And calculating according to the table three test values to obtain table four data, wherein the calculation process is as follows:
1. calculating the dilution ratio
2. The actual concentration C 'of the gas in the sample gas can be calculated by the dilution ratio R'CH4、C'CO2、C'H2S：
C'CH4＝R×(CCH4-CEmpty CH4)+CEmpty CH4＝59.95％
C'CO2＝R×(CCO2-CEmpty CO2)+CEmpty CO2＝40.23％
C'H2S＝R×(CH2S-CEmpty H2S)+CEmpty H2S＝0.18％
C'O2＝＝0.48％＝CSample oxygen
3. Correcting the calculated data:
according to C'CH4+C'CO2+C'H2S+CSample O2100.84% ≠ 100% with modifications:
PO2＝Csample O2＝0.48％
Table four: comparison table for concentration of raw material gas and concentration calculated by dilution method
The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (8)
1. A gas analysis apparatus, characterized in that: the method comprises the following steps: an air collection channel, a sample gas collection channel, and a mixed gas channel simultaneously communicated with the air collection channel and the sample gas collection channel, wherein,
an air collection channel: comprises an air inlet, an air suction device, an air inlet electromagnetic valve U1, a flow regulating valve V1 and a gas flow meter W1;
a sample gas collection channel: comprises a sample gas inlet, a sample gas pumping device, an oxygen sensor, a gas inlet electromagnetic valve U2 and a flow regulating valve V2;
a mixed gas channel: comprises a gas flow meter W2, a gas mixing device, a gas analysis unit and a gas mixing device.
2. A gas analysis apparatus according to claim 1, wherein: the air collection channel further comprises an air filtering device, and the air filtering device adopts a HEPA filtering device.
3. A gas analysis apparatus according to claim 2, wherein: the sample gas collection passage further comprises a flame arrester.
4. A gas analysis apparatus according to claim 2, wherein: the air pumping device and the sample air pumping device can be fans or air pumps.
5. A gas analysis apparatus according to claim 2, wherein: the gas flow meters W1 and W2 are ultrasonic gas flow meters.
6. A gas analysis apparatus according to claim 2, wherein: the carrier gas of the gas mixing device is formed by mixing air introduced from the air inlet and sample gas introduced from the sample gas inlet.
7. A method of gas analysis, comprising the steps of:
step 1: opening an air inlet electromagnetic valve U1, opening a flow regulating valve V1 and starting an air collecting channel;
step 2: air was drawn into the gas mixing apparatus, the flow rate of the reading gas flow meter W1 was F1, the flow rate of the reading gas flow meter W2 was F2:
if F1 ≠ F2, using F1 or F2 as calibration gas flow meter calibration so that F1 ≠ F2, execute step 3;
if F1 is F2, go to step 3;
and step 3: tong (Chinese character of 'tong')Passing through a gas analysis unit for detecting the concentration of a certain component X in the air containing sample gas as CEmpty X；
And 4, step 4: opening the air inlet electromagnetic valve U1, reading a flow value F3 through a gas flowmeter W1, and reading a flow value F4 through a gas flowmeter W2;
and 5: flow data of the gas flow meters W1 and W2 are collected by a gas analysis unit, and a dilution ratio R:
<mrow> <mi>R</mi> <mo>=</mo> <mfrac> <mrow> <mi>F</mi> <mn>4</mn> </mrow> <mrow> <mi>F</mi> <mn>4</mn> <mo>-</mo> <mi>F</mi> <mn>3</mn> </mrow> </mfrac> <mo>;</mo> </mrow>
step 6: the value of R is determined by adjusting the flow regulating valves V1 and V2, wherein m is more than or equal to R and less than or equal to n (m and n are natural numbers), so that the diluent gas reaches a certain dilution ratio;
and 7: detecting the concentration C of the mixed diluent gas by a gas analysis unit of the diluent gasxAnd calculating the actual concentration C of the gas in the sample gas according to the R valuex′：
Cx′×(F4-F3)+CEmpty X×F3＝Cx×F4
Cx′＝R×(Cx-CEmpty X)+CEmpty X
And 8: correcting the concentration:
if C1′+C2′+...+Ci' notequal to 100%, and the gas concentration in the sample gas after correction is Px:
<mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> </mrow> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> </mfrac> <mo>*</mo> <mn>100</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> </mrow> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> </mfrac> <mo>*</mo> <mn>100</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mn>......</mn> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> </mfrac> <mo>*</mo> <mn>100</mn> </mrow> </mtd> </mtr> </mtable> </mfenced>
X is a component in the sample gas, and X is 1, 2 and 3 … … i.
8. A method of gas analysis, comprising the steps of:
step 1: introducing sample gas from a sample gas inlet: reading the oxygen sensor value A1 of the sample gas channel; reading the gas analysis unit value A2 of the mixed gas channel, and adjusting zero through calibration to make A1 equal to A2;
step 2: air is introduced from the air inlet: the air inlet electromagnetic valve U1 is opened, the flow regulating valve V1 is regulated, and air is pumped to the air mixing deviceIn the method, the oxygen concentration in the air is measured to be C by a gas analysis unitAir oxygen；
And step 3: introducing sample gas from a sample gas inlet: adjusting a flow regulating valve V2, starting a sample gas collecting channel, extracting the sample gas into a gas mixing device, and measuring the oxygen concentration in the sample gas to be C through an oxygen sensorSample oxygenCollecting oxygen concentration C in the gas mixing device through the gas analysis unitOxygen mixingAnd calculating the dilution ratio R:
and 4, step 4: the value of R is determined by adjusting the flow regulating valves V1 and V2, wherein m is more than or equal to R and less than or equal to n (m and n are natural numbers), so that the diluent gas reaches a certain dilution ratio;
and 5: opening an air inlet electromagnetic valve U1, starting an air collecting channel, and measuring the concentration of a certain component X containing sample gas in the air to be C through a gas analysis unitEmpty X；
Step 6: opening the electromagnetic valve U1, collecting the mixed sample gas by the gas analysis unit of the dilution passage, and detecting the concentration C of the mixed gas by the gas analysis unitxCalculating the actual concentration C of the gas in the sample gas according to the dilution ratio Rx′：
Cx′＝R×(CX-CEmpty X)+CEmpty X；
And 7: correcting the concentration:
if C1′+C2′+...+Ci' notequal to 100%, and the gas concentration in the sample gas after correction is Px:
<mfenced open = "" close = ""> <mtable> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mn>1</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> </mrow> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> </mfrac> <mo>*</mo> <mn>100</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mn>2</mn> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> </mrow> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> </mfrac> <mo>*</mo> <mn>100</mn> </mrow> </mtd> </mtr> <mtr> <mtd> <mn>......</mn> </mtd> </mtr> <mtr> <mtd> <mrow> <msub> <mi>P</mi> <mi>i</mi> </msub> <mo>=</mo> <mfrac> <mrow> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> <mrow> <msup> <msub> <mi>C</mi> <mn>1</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <msup> <msub> <mi>C</mi> <mn>2</mn> </msub> <mo>&prime;</mo> </msup> <mo>+</mo> <mn>...</mn> <mo>+</mo> <msup> <msub> <mi>C</mi> <mi>i</mi> </msub> <mo>&prime;</mo> </msup> </mrow> </mfrac> <mo>*</mo> <mn>100</mn> </mrow> </mtd> </mtr> </mtable> </mfenced>
X is a component in the sample gas, and X is 1, 2 and 3 … … i.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991472A (en) * | 2017-12-01 | 2018-05-04 | 无锡市尚沃医疗电子股份有限公司 | Compound expiration detection method and device |
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| CN109991289A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | The electrochemical sensor device of high concentration CO is measured by dilution process |
| CN110361439A (en) * | 2019-08-07 | 2019-10-22 | 北京软通智慧城市科技有限公司 | Gas concentration measuring apparatus and its control method |
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| CN113252864A (en) * | 2021-06-03 | 2021-08-13 | 四川铭鉴知源科技有限公司 | Chromatogram preliminary treatment gas circuit |
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51113689A (en) * | 1975-03-28 | 1976-10-06 | Hitachi Ltd | Sampling device for analyzing device |
| US5569838A (en) * | 1994-03-05 | 1996-10-29 | Testo Gmbh & Co. | Process and device for measuring a gas medium with a chemical sensor |
| CN101923035A (en) * | 2009-11-27 | 2010-12-22 | 广东中烟工业有限责任公司 | Method for collecting and detecting aerosol in side-stream smoke applicable to cigarettes having different concentrations of tar |
| CN102706782A (en) * | 2012-05-18 | 2012-10-03 | 北京金铠星科技有限公司 | Method for detecting weight of micro-particles exhausted by gasoline car |
| CN202661435U (en) * | 2012-04-20 | 2013-01-09 | 武汉四方光电科技有限公司 | Device for prolonging service life of hydrogen sulfide electrochemical sensor |
| CN204027887U (en) * | 2014-08-26 | 2014-12-17 | 天津市环境保护科学研究院 | A kind of adjustable extraction-type dilution sampling instrument |
| CN104729891A (en) * | 2015-03-24 | 2015-06-24 | 南京埃森环境技术有限公司 | PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on carbon dioxide concentration control |
| CN105181397A (en) * | 2015-09-22 | 2015-12-23 | 陕西睿海丽君环境科技有限公司 | Sampling detection system for mixed gas at ammunition explosion kill and wound region |
| CN105334259A (en) * | 2015-11-12 | 2016-02-17 | 中国石油化工股份有限公司 | Total hydrocarbon tester having on-line attenuation function |
-
2017
- 2017-05-16 CN CN201710345308.3A patent/CN107192791A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS51113689A (en) * | 1975-03-28 | 1976-10-06 | Hitachi Ltd | Sampling device for analyzing device |
| US5569838A (en) * | 1994-03-05 | 1996-10-29 | Testo Gmbh & Co. | Process and device for measuring a gas medium with a chemical sensor |
| CN101923035A (en) * | 2009-11-27 | 2010-12-22 | 广东中烟工业有限责任公司 | Method for collecting and detecting aerosol in side-stream smoke applicable to cigarettes having different concentrations of tar |
| CN202661435U (en) * | 2012-04-20 | 2013-01-09 | 武汉四方光电科技有限公司 | Device for prolonging service life of hydrogen sulfide electrochemical sensor |
| CN102706782A (en) * | 2012-05-18 | 2012-10-03 | 北京金铠星科技有限公司 | Method for detecting weight of micro-particles exhausted by gasoline car |
| CN204027887U (en) * | 2014-08-26 | 2014-12-17 | 天津市环境保护科学研究院 | A kind of adjustable extraction-type dilution sampling instrument |
| CN104729891A (en) * | 2015-03-24 | 2015-06-24 | 南京埃森环境技术有限公司 | PM2.5 (Particulate Matter 2.5) source analyzing and sampling device based on carbon dioxide concentration control |
| CN105181397A (en) * | 2015-09-22 | 2015-12-23 | 陕西睿海丽君环境科技有限公司 | Sampling detection system for mixed gas at ammunition explosion kill and wound region |
| CN105334259A (en) * | 2015-11-12 | 2016-02-17 | 中国石油化工股份有限公司 | Total hydrocarbon tester having on-line attenuation function |
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107991472A (en) * | 2017-12-01 | 2018-05-04 | 无锡市尚沃医疗电子股份有限公司 | Compound expiration detection method and device |
| CN109991289A (en) * | 2017-12-31 | 2019-07-09 | 中国人民解放军63653部队 | The electrochemical sensor device of high concentration CO is measured by dilution process |
| CN110646361A (en) * | 2018-06-07 | 2020-01-03 | 上海致密科技有限公司 | On-line detection device for detecting total hydrocarbon content of gas |
| CN110646361B (en) * | 2018-06-07 | 2022-11-01 | 上海致密科技有限公司 | On-line detection device for detecting total hydrocarbon content of gas |
| US11982651B2 (en) | 2018-07-26 | 2024-05-14 | Inficon Gmbh | Method for adapting the concentration of a sample gas in a gas mixture to be analysed by a gas chromatograph assembly, and chromatograph assembly therefore |
| CN112384798B (en) * | 2018-07-26 | 2024-02-09 | 英福康有限责任公司 | Method for adjusting concentration of sample gas and gas chromatograph assembly |
| CN112384798A (en) * | 2018-07-26 | 2021-02-19 | 英福康有限责任公司 | Method for adjusting the concentration of a sample gas in a gas mixture to be analyzed by means of a gas chromatograph assembly, and gas chromatograph assembly |
| CN109374732B (en) * | 2018-08-14 | 2022-01-04 | 杭州超钜科技有限公司 | Portable rapid hydrogen measuring device for fault escape gas and monitoring method thereof |
| CN109374732A (en) * | 2018-08-14 | 2019-02-22 | 杭州超钜科技有限公司 | Tomography escapes the portable quick hydrogen-measuring apparatus of gas and its monitoring method |
| CN110596310B (en) * | 2019-08-05 | 2023-03-10 | 苏州迈优医疗科技有限公司 | Exhaled gas analyzer and operation method |
| CN110596310A (en) * | 2019-08-05 | 2019-12-20 | 苏州迈优医疗科技有限公司 | Exhaled gas analyzer and operation method |
| CN110361439A (en) * | 2019-08-07 | 2019-10-22 | 北京软通智慧城市科技有限公司 | Gas concentration measuring apparatus and its control method |
| CN112781969A (en) * | 2019-11-06 | 2021-05-11 | 中国石油化工股份有限公司 | Gas dilution device and method for online monitoring |
| CN113252864A (en) * | 2021-06-03 | 2021-08-13 | 四川铭鉴知源科技有限公司 | Chromatogram preliminary treatment gas circuit |
| CN114113480A (en) * | 2021-11-23 | 2022-03-01 | 青岛崂应海纳光电环保集团有限公司 | Multi-gas-sensor response time automatic testing device and method |
| CN114113480B (en) * | 2021-11-23 | 2024-03-26 | 青岛崂应海纳光电环保集团有限公司 | Multi-gas sensor response time automatic testing device and method |
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