CN113820196A - CO (carbon monoxide)2High-concentration online dilution system and dilution method thereof - Google Patents
CO (carbon monoxide)2High-concentration online dilution system and dilution method thereof Download PDFInfo
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- CN113820196A CN113820196A CN202111020506.5A CN202111020506A CN113820196A CN 113820196 A CN113820196 A CN 113820196A CN 202111020506 A CN202111020506 A CN 202111020506A CN 113820196 A CN113820196 A CN 113820196A
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- 238000010790 dilution Methods 0.000 title claims abstract description 57
- 239000012895 dilution Substances 0.000 title claims abstract description 57
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims description 5
- 229910002091 carbon monoxide Inorganic materials 0.000 title claims description 5
- 238000003113 dilution method Methods 0.000 title description 7
- 239000012528 membrane Substances 0.000 claims abstract description 12
- 239000007789 gas Substances 0.000 claims description 66
- 239000002689 soil Substances 0.000 claims description 38
- 239000002680 soil gas Substances 0.000 claims description 12
- 238000005070 sampling Methods 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 abstract description 7
- 238000005086 pumping Methods 0.000 abstract description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012470 diluted sample Substances 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/38—Diluting, dispersing or mixing samples
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses CO2The online high-concentration dilution system mainly comprises a zero gas cylinder, a pressure reducing valve, a mass flow meter, a gas mixing module, a low-flow-rate pump, a semipermeable membrane adopting pipe, a profile system, a filter and an analyzer, wherein the pressure reducing valve is connected with a three-way electromagnetic valve to divide an upper pipeline and a lower pipeline, each pipeline is connected with one mass flow meter, each mass flow meter is sequentially connected with one two-way electromagnetic valve and one gas mixing module, one mass flow meter and one low-flow-rate pump are sequentially connected behind each gas mixing module, each low-flow-rate pump is connected with one front 4 interfaces of one 8-channel electromagnetic valve, the two gas mixing modules are connected with two three-way electromagnetic valves, the two three-way electromagnetic valves are connected with the profile system, and the profile system is sequentially connected with the filter and the PICARRO analyzer through pipelines. The invention adopts the double-group dilution system for parallel use, one group can be used for pumping candidate measurement when the other group is used for measurement, thereby not only increasing the gas mixing time, but also accelerating the dilution speed.
Description
Technical Field
The invention belongs to CO2The technical field of treatment, in particular to CO2A high-concentration online dilution system and a dilution method thereof.
Background
The soil is the largest of the earth's surface systemsOne of the most active carbon pools, the European and American countries, is a national comprehensive research project for analyzing the carbon sequestration potential of soil and realizing the same, so as to be used as a way for controlling and formulating CO2Emission list and CO2The basis of emission reduction quota and deep knowledge of CO in soil2The emission characteristics of the fuel are critical. CO in soil2The concentration is often as high as ten thousand ppm, far exceeding the range of the existing instruments (4000 ppm). Therefore, it is necessary to treat CO in advance2Gas is diluted on-line, existing CO2The online dilution system has the following disadvantages: (1) existing CO2The reaction speed of the dilution system is slow; (2) CO 22The efficiency of the gas dilution system is low, the dilution multiple is manually set, the dilution work is finished according to the fixed multiple, the concentration of gas in the diluted sample is out of the range of the spectrometer, and the analysis work can be finished only by dilution again; (3) existing CO2The dilution system is not fully mixed, which is not beneficial to subsequent dilution and reduces the dilution efficiency. Therefore, there is an urgent need to research a CO2A high concentration online dilution system and a dilution method are necessary to solve the above problems.
Disclosure of Invention
In order to solve the defects in the prior art, the invention aims to provide CO2A high-concentration online dilution system and a dilution method thereof. The system can accelerate CO2The speed of on-line dilution is increased, and CO is increased2Efficiency of on-line dilution.
In order to achieve the purpose, the method adopts the following technical scheme:
CO (carbon monoxide)2High concentration dilutes the system on line, dilute the system on line and include zero gas cylinder, relief pressure valve, mass flow meter, two pass solenoid valve, mix gas module, low velocity of flow pump, 8 way sensor module, soil moisture or baroceptor, pellicle and adopt pipe, profile system, filter, analysis appearance, link to each other through the screw mouth between zero gas cylinder and the relief pressure valve, two upper and lower pipelines are passed through the pipe connection tee bend solenoid valve and are separated to the relief pressure valve, and a mass flow meter is respectively connected to every pipeline, every mass flow meter all connects gradually a two pass solenoid valve and mixes the gas module, everyConnect a mass flow meter and low velocity of flow pump in proper order again behind the module, every low velocity of flow pump connects one and a mass flow meter in the preceding 4 interfaces of an 8 passageway solenoid valves respectively, two pipeline that mix the gas module and pass through the check valve and be connected with two three-way solenoid valves, two three-way solenoid valves connect the profile system, the profile system has connected gradually filter and PICARRO analysis appearance through the pipeline.
Furthermore, the pipeline is connected with the mass flow meter through a spiral port.
Further, the screw opening is a screw opening of G5/8 type, and the pipeline is a pipeline of 1/8 type.
Furthermore, each 8-channel electromagnetic valve is connected with 4 soil air inlets and 4 soil air outlets.
Furthermore, a semipermeable membrane sampling pipe is connected between the soil air inlet and the soil air outlet of each 8-channel electromagnetic valve.
Furthermore, one end of the semipermeable membrane sampling pipes of the upper group is provided with 8 paths of sensor modules and a soil humidity or air pressure sensor.
Furthermore, the soil air inlet and the soil air outlet of each 8-channel electromagnetic valve are connected with an auxiliary circulating pump.
Further, a method of using the above CO2High-concentration online dilution system for online dilution of CO in soil2The method mainly comprises the following steps:
s1, enabling the gas collected in the semipermeable membrane sampling pipe to enter a low-flow-rate pump through a soil gas inlet of an 8-channel electromagnetic valve;
s2, controlling the gas to enter the gas mixing module at a flow rate of 5ml/min through the mass flow meter, controlling the zero gas in the zero gas bottle to enter the gas mixing module at a flow rate of 45ml/min through the mass flow meter, and uniformly mixing the collected gas and the zero gas in the gas mixing module;
s3, enabling the uniformly mixed gas to enter a profile system, filtering by a filter, and then entering an analyzer for analysis; if the analyzer detects CO2Too high concentrationThe dilution ratio is increased by adjusting the flow rate of the mass flow meter if CO is detected2If the concentration is too low and is lower than the detection line of the instrument, the dilution ratio is reduced by adjusting the flow rate of the mass flow meter.
Compared with the prior art, the invention has the beneficial effects that:
CO of the invention2High-concentration online dilution system and dilution method by using collected CO in soil2The target gas and the zero gas in the zero gas cylinder are controlled by the mass flow meter to enter the gas mixing module at different flow rates to be uniformly mixed, and then the target gas and the zero gas enter the analyzer to be analyzed. CO of the invention2The high-concentration online dilution system can fully mix the target gas and the mixed gas, so that the dilution efficiency is improved, the dilution system and the dilution method can automatically dilute, the dilution ratio can be quickly changed according to the analysis result of the analyzer, meanwhile, the two-group dilution system is used in parallel, when one group of dilution systems is used for measurement, the other group of dilution systems can be used for pumping candidate measurement, the gas mixing time is prolonged, and the dilution speed is accelerated.
Drawings
FIG. 1 is a CO of the present invention2And (3) a schematic structure diagram of a high-concentration online dilution system.
Wherein, the part names represented by the numbers in the figures are respectively:
1. a zero gas cylinder; 2. a pressure reducing valve; 3. a mass flow meter; 4. a two-way solenoid valve; 5. a gas mixing module; 6. an auxiliary circulation pump; 7. a low flow rate pump; 8. an 8-way sensor; 9. a soil humidity or barometric pressure sensor; 10. a semipermeable membrane sampling tube; 11. a two-position three-way electromagnetic valve; 12. a one-way valve; 13. a profile system; 14. a filter; 15. a PICARRO analyzer; 16. a PICARRO auxiliary pump; 17. 4 ports on the 8-channel electromagnetic valve; 18. the lower port of the 8-channel electromagnetic valve is 4.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below in connection with specific embodiments, but it should be understood by those skilled in the art that the embodiments described below are only for illustrating the present invention and should not be construed as limiting the scope of the present invention. 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.
Example 1
CO (carbon monoxide)2High concentration dilutes the system on line, dilute the system on line and include zero gas cylinder 1, relief pressure valve 2, mass flow meter 3, two lead to solenoid valve 4, mix gas module 5, low velocity of flow pump 7, 8 way sensor module 8, soil humidity or gas sensor 9, pellicle adoption pipe 10, profile system 13, filter 14, analysis appearance 15, it links to each other through G5/8 spiral port between zero gas cylinder 1 and the relief pressure valve 2, two pipelines about relief pressure valve 2 passes through 1/8 pipeline (the pipeline external diameter is 1/8 inches) connection three way solenoid valve and divides, and upper and lower every pipeline respectively connects a mass flow meter 3 through G5/8 spiral port, every mass flow meter 3 all connects gradually a two lead to solenoid valve 4 and mix gas module 5, connect gradually a mass flow meter 3 and low velocity of flow pump 7 after every mixes gas module 5 again, every low velocity of flow pump 7 connects one in the preceding 4 interfaces of an 8 passageway solenoid valve and a mass flow meter 3 respectively, every 8 passageway solenoid valve is connected with 4 soil air inlets and 4 soil gas outlets, above 4 soil air inlets and 4 soil gas outlets of a set of 8 passageway solenoid valves are soil air inlet 1, 3, 5, 7 and soil gas outlet 1, 3, 5, 7 respectively, following 4 soil air inlets and 4 soil gas outlets of a set of 8 passageway solenoid valves are soil air inlet 2, 4, 6, 8 and soil gas outlet 2, 4, 6, 8 respectively, soil gas outlet 7 and soil gas outlet 8 are connected 4 mouths under 8 passageway solenoid valves and the 8 passageway solenoid valves respectively, be connected with a pellicle sampling pipe (10) between the soil air inlet and the soil gas outlet of every 8 passageway solenoid valves, for collecting CO in target gas soil2Namely, semi-permeable membrane pipes are connected between the air inlet and the air outlet between ports 1, 3, 5 and 2, 4, 6, 8 of the electromagnetic valve, and only ports 1 and 2 are taken as examples in fig. 1. One end of a semipermeable membrane sampling pipe (10) connected between the single soil air inlet and the soil air outlet is provided with 8 paths of sensor modules (8) and soil humidity orBaroceptor (9) for the humidity or the atmospheric pressure of test soil, subsequent mixture and the analysis of being convenient for, the soil air inlet and the soil gas outlet of every 8 passageway solenoid valves all are connected with an auxiliary circulating pump 6, upper and lower two sets of module 5 that mixes all are connected with check valve 12 and adjust the inlet flow rate that mixes gas module 5, and upper and lower two sets of module 5 that mixes is connected with 1 mouthful and 3 mouths with two three way solenoid valve 11 respectively through the pipeline, 2 mouths of two three way solenoid valve 11 connect profile system 13, profile system 13 has connected gradually filter 14 and PICARRO analysis appearance 15 through the pipeline, and PICARRO analysis appearance 15 still is connected with the PICARRO auxiliary pump.
The mass flowmeter in the high-concentration online dilution system directly controls the flow of gas through software, and the mass flowmeter used in the high-concentration online dilution system has two measuring ranges which are 0-10 ml/min and 0-100 ml/min respectively; the gas flow required for the PICARRO analyzer is 28ml/min, so the dilution ratio of the invention is tentatively 1: 3. 1: 9 and 1:24, the default test dilution ratio of the system is 1: 9.
the above CO2High-concentration online dilution system for online dilution of CO in soil2The method mainly comprises the following steps:
s1, enabling the gas collected in the semipermeable membrane sampling pipe 10 to enter the low-flow-rate pump 7 through a soil gas inlet of the 8-channel electromagnetic valve;
s2, controlling the gas to enter the gas mixing module 5 at a flow rate of 5ml/min through the mass flow meter 3, controlling the zero gas in the zero gas bottle 1 to enter the gas mixing module 5 at a flow rate of 45ml/min through the mass flow meter 3, and uniformly mixing the collected gas and the zero gas in the gas mixing module 5;
s3, enabling the uniformly mixed gas to enter the profile system 13, filtering the gas through the filter 14, and then entering the analyzer 15 for analysis, wherein during normal test, the system is as follows: 9 dilution ratio, when the test is carried out for 1 minute (tentative), CO2When the concentration is lower than 200ppm or higher than 2000ppm, after the current test time is over, the dilution ratio is reset and the test is carried out again, the system is allowed to run for a complete one-way measurement time (for example, the one-way measurement time is set to be 2min and then run for 2min), and the running time is not recordedData, then after the idle running is finished, starting to record the data, and after the test is finished, starting the next group of tests; when the ratio of 1: 9 dilution ratio test (after 1 minute) at concentrations below 200ppm the dilution ratio was adjusted to 1:3, when the ratio of 1:3 is still lower than 200ppm, the adjustment is not carried out; when the ratio of 1: 9 dilution ratio test (after 1 minute) the dilution ratio was adjusted to 1:24 if the concentration was above 2000ppm and was not adjusted if 1:24 or above 2000 ppm; each measurement defaults to 1: 9, adjusting the dilution ratio when the concentration is out of the range of 200-2000 ppm.
Claims (8)
1. CO (carbon monoxide)2The high-concentration online dilution system is characterized by comprising a zero gas cylinder (1), a pressure reducing valve (2), a mass flow meter (3), a two-way electromagnetic valve (4), a gas mixing module (5), a low flow rate pump (7), an 8-way sensor module (8), a soil humidity or air pressure sensor (9), a semipermeable membrane adopting pipe (10), a contour system (13), a filter (14) and an analyzer (15), wherein the zero gas cylinder (1) is connected with the pressure reducing valve (2) through a spiral port, the pressure reducing valve (2) is connected with the three-way electromagnetic valve through a pipeline and is divided into an upper pipeline and a lower pipeline, each pipeline is respectively connected with one mass flow meter (3), each mass flow meter (3) is sequentially connected with one two-way electromagnetic valve (4) and the gas mixing module (5), and then one mass flow meter (3) and the low flow rate pump (7) are sequentially connected behind each gas mixing module (5), every low velocity of flow pump (7) connects one and a mass flow meter (3) in the preceding 4 interfaces of an 8 passageway solenoid valves respectively, two pipeline that mix gas module (5) and connect through check valve (12) are connected with two three-way solenoid valve (11), two three-way solenoid valve (11) are connected profile system (13), profile system (13) have connected gradually filter (14) and PICARRO analysis appearance (15) through the pipeline.
2. CO according to claim 12The high-concentration online dilution system is characterized in that the pipeline is connected with the mass flowmeter (3) through a spiral port.
3. A CO according to claim 1 or 22The high-concentration on-line dilution system is characterized in thatThe screw port is a G5/8 type screw port, and the pipeline is a 1/8 type pipeline.
4. CO according to claim 12The high-concentration online dilution system is characterized in that each 8-channel electromagnetic valve is connected with 4 soil air inlets and 4 soil air outlets.
5. CO according to claim 42The high-concentration online dilution system is characterized in that a semipermeable membrane sampling pipe (10) is connected between a soil air inlet and a soil air outlet of each 8-channel electromagnetic valve.
6. CO according to claim 52The high-concentration online dilution system is characterized in that one end of the semi-permeable membrane sampling pipe (10) of the upper group is provided with 8 paths of sensor modules (8) and a soil humidity or air pressure sensor (9).
7. CO according to claim 42The high-concentration online dilution system is characterized in that a soil air inlet and a soil air outlet of each 8-channel electromagnetic valve are connected with an auxiliary circulating pump (6).
8. Use of a CO according to any one of claims 1 to 72High-concentration online dilution system for online dilution of CO in soil2The method is characterized by mainly comprising the following steps:
s1, enabling the gas collected in the semipermeable membrane sampling pipe (10) to enter a low-flow-rate pump (7) through a soil gas inlet of an 8-channel electromagnetic valve;
s2, controlling the gas to enter the gas mixing module (5) at a flow rate of 5ml/min through the mass flow meter (3), controlling the zero gas in the zero gas bottle (1) to enter the gas mixing module (5) at a flow rate of 45ml/min through the mass flow meter (3), and uniformly mixing the collected gas and the zero gas in the gas mixing module (5);
s3, the uniformly mixed gas enters the profile system (13) and passes throughAfter being filtered by the filter (14), the mixture enters an analyzer (15) for analysis; if the analyzer (15) detects CO2The dilution ratio is increased by adjusting the flow rate of the mass flow meter (3) if the concentration is too high, and if CO is detected2If the concentration is too low and is lower than the detection line of the instrument, the dilution ratio is lowered by adjusting the flow rate of the mass flow meter (3).
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| CN202111020506.5A CN113820196A (en) | 2021-09-01 | 2021-09-01 | CO (carbon monoxide)2High-concentration online dilution system and dilution method thereof |
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| CN202111020506.5A CN113820196A (en) | 2021-09-01 | 2021-09-01 | CO (carbon monoxide)2High-concentration online dilution system and dilution method thereof |
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2021
- 2021-09-01 CN CN202111020506.5A patent/CN113820196A/en active Pending
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