CN112816272A - Gas enrichment method and device - Google Patents
Gas enrichment method and device Download PDFInfo
- Publication number
- CN112816272A CN112816272A CN202011600360.7A CN202011600360A CN112816272A CN 112816272 A CN112816272 A CN 112816272A CN 202011600360 A CN202011600360 A CN 202011600360A CN 112816272 A CN112816272 A CN 112816272A
- Authority
- CN
- China
- Prior art keywords
- gas
- valve
- gas tank
- enrichment
- volume
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2273—Atmospheric sampling
-
- 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
- G01N1/40—Concentrating samples
Landscapes
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Biomedical Technology (AREA)
- Molecular Biology (AREA)
- Engineering & Computer Science (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention provides a gas enrichment method and a device, wherein the gas enrichment method comprises the following steps: when the sampling volume is larger, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected, and the flow meter and the gas tank are disconnected; under the suction of a pump, sample gas enters the enrichment pipe, then flows through a first valve, a second valve and a flowmeter in sequence, and the flowmeter is used for metering the volume of the sample gas entering the enrichment pipe; when the sampling volume is smaller, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected; under the suction of the pump, the gas in the gas tank flows through the second valve and the flowmeter in sequence, and the pressure in the gas tank is reduced; the first valve and the second valve are switched to disconnect the gas tank from the flow meter; the sample gas sequentially flows through the enrichment pipe and the first valve and enters the gas tank, and the pressure in the gas tank is increased; pressure sensors monitor the pressure within the gas canister during both venting and intake of the gas canister. The invention has the advantages of accurate volume measurement and the like.
Description
Technical Field
The invention relates to gas sampling, in particular to a gas enrichment method and a gas enrichment device.
Background
Currently, in a sampling type atmosphere analysis instrument, the following scheme is generally adopted for sampling:
1. the quantitative ring determines the volume, and the problems are that: in view of the fixity of the volume of the quantitative ring, when the sampling volume needs to be changed, the quantitative ring needs to be replaced, and the volume changes due to the temperature change;
2. the control of the mass flowmeter has the following problems: the flow below the range of 5 percent is not accurate, and the control fluctuation is large when the mass flowmeter is started, so that a mass flowmeter with the range of 100ml cannot accurately adopt a small-volume sample below 20 ml;
3. the volume is calculated by the pressure change of the gas storage tank, the measuring range can only be 50 times due to the precision of the sensor and the control delay, for example, a 1L tank can only accurately collect 20 ml. In the practical use process, for example, a marked line is established according to volume sampling, the concentration of the standard gas is 50ppb, 0.1ppb to 50ppb is established, 1L is required to be adopted for 50ppb, and 2ml is required to be adopted for 0.1 ppb.
However, the above 3 measurement methods cannot accurately adopt 2ml, so that the range of the established standard curve is narrow, and even two standard curves have to be divided.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention provides a gas enrichment method.
The purpose of the invention is realized by the following technical scheme:
a gas enrichment method, comprising:
when the sampling volume is larger, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected, and the flow meter and the gas tank are disconnected;
under the suction of a pump, sample gas enters an enrichment pipe by using the multi-way valve, then sequentially flows through a first valve, a second valve and a flowmeter, and the volume of the sample gas entering the enrichment pipe is measured by using the flowmeter;
when the sampling volume is smaller, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected,
under the suction of the pump, the gas in the gas tank flows through the second valve and the flowmeter in sequence, and the pressure in the gas tank is reduced;
the first valve and the second valve are switched to disconnect the gas tank from the flow meter;
sample gas sequentially flows through the enrichment pipe and the first valve and enters the gas tank, and the pressure in the gas tank is increased;
a pressure sensor monitors the pressure within the gas canister during both venting and intake of the gas canister.
Another object of the present invention is to provide a gas enrichment apparatus, that is, an apparatus for implementing the gas enrichment method of the present invention, wherein the object of the present invention is achieved by the following technical solutions:
a gas enrichment device comprising a multi-way valve, an enrichment tube, and a flow meter; the gas enrichment device further comprises:
a first valve for selectively communicating the enrichment tube with the gas tank and a first inlet of the first valve, and a second valve for selectively communicating a flow meter downstream of the second valve with the first inlet and the gas tank;
the gas tank is communicated with the outlet of the first valve and the second inlet of the second valve respectively;
a pressure sensor for monitoring the pressure within the gas canister.
Compared with the prior art, the invention has the beneficial effects that:
1. the problem that the low range of the flowmeter is inaccurate is solved, the problem that the vacuum tank cannot adopt large volume and small volume is also solved, a standard curve is built according to the volume, and the range is expanded by more than 20 times compared with the traditional scheme;
different quantification methods were designed for different volume measurements: the flowmeter is adopted for metering in large volume, and the combination of a gas tank, a valve, a flowmeter and a pump is adopted in small volume;
2. simple structure, powerful function and high reliability.
Drawings
The disclosure of the present invention will become more readily understood with reference to the accompanying drawings. As is readily understood by those skilled in the art: these drawings are only for illustrating the technical solutions of the present invention and are not intended to limit the scope of the present invention. In the figure:
fig. 1 is a schematic structural view of a gas enrichment apparatus according to an embodiment of the present invention.
Detailed Description
Fig. 1 and the following description depict alternative embodiments of the invention to teach those skilled in the art how to make and reproduce the invention. Some conventional aspects have been simplified or omitted for the purpose of teaching the present invention. Those skilled in the art will appreciate that variations or substitutions from these embodiments will be within the scope of the invention. Those skilled in the art will appreciate that the features described below can be combined in various ways to form multiple variations of the invention. Thus, the present invention is not limited to the following alternative embodiments, but is only limited by the claims and their equivalents.
Example 1:
the gas enrichment method provided by the embodiment of the invention comprises the following steps:
when the sampling volume is larger, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected, and the flow meter and the gas tank are disconnected;
under the suction of a pump, sample gas enters an enrichment pipe by using the multi-way valve, then sequentially flows through a first valve, a second valve and a flowmeter, and the volume of the sample gas entering the enrichment pipe is measured by using the flowmeter;
when the sampling volume is smaller, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected;
under the suction of the pump, the gas in the gas tank flows through the second valve and the flowmeter in sequence, and the pressure in the gas tank is reduced;
the first valve and the second valve are switched to disconnect the gas tank from the flow meter;
sample gas sequentially flows through the enrichment pipe and the first valve and enters the gas tank, and the pressure in the gas tank is increased;
a pressure sensor monitors the pressure within the gas canister during both venting and intake of the gas canister.
To accurately meter the volume of gas passing through the enrichment tube, further, when the sampling volume is small, the enriched sample gas volume
V0Volume of gas to discharge the gas tank, P0At atmospheric pressure, P1Is the pressure of the gas tank after the gas is discharged, P2Is the pressure of the gas tank after entering the gas.
In order to reduce the influence of the size of the gas tank on the gas volume metering, further, the ratio of the volume of the gas tank to the sample gas volume V is greater than 1.5.
In order to accurately meter the gas volume, further, in the injection of the gas tank, the gas inflow is regulated with a proportional valve.
In order to reduce the structural complexity, further, the first valve and the second valve adopt a two-position three-way valve, so that the enrichment pipe selectively communicates the second valve with the gas tank, and the flow meter selectively communicates the first valve with the gas tank.
In order to divide the gas sampling modes with different volumes, the larger volume is more than 50mL, and the smaller volume is 50mL or less.
Fig. 1 shows a schematic structural diagram of a gas enrichment apparatus according to an embodiment of the present invention, and as shown in fig. 1, the gas enrichment apparatus includes:
a multi-way valve 11, an enrichment pipe 21 and a flow meter;
a first valve 31 and a second valve 32, said first valve 31 for selectively communicating said enrichment tube 21 with a gas tank 51 and a first inlet of the first valve 31, said second valve 32 for selectively communicating a flow meter downstream of said second valve 32 with said first inlet and the gas tank 51;
a gas tank 51, wherein the gas tank 51 is respectively communicated with the outlet of the first valve 31 and the second inlet of the second valve 32;
a pressure sensor 61, said pressure sensor 61 for monitoring the pressure in said gas tank 51.
In order to improve the accuracy of the small-volume gas metering, further, the gas enrichment device further comprises:
and one end of the proportional valve 41 is communicated with the gas tank 51, and the other end of the proportional valve 41 is respectively communicated with the outlet of the first valve 31 and the second inlet of the second valve 32.
Example 2:
an application example of the gas enrichment method and the apparatus according to embodiment 1 of the present invention.
In this application example, as shown in fig. 1, the multi-way valve 11 is a six-way valve, and the first valve 31 and the second valve 32 are two-way three-way valves; the flow meter is a mass flow meter and is arranged downstream of the outlet of the second valve 32; a pump disposed downstream of the mass flow meter; one end of the proportional valve 41 is communicated with the gas tank 51, and the other end is respectively communicated with the outlet of the first valve 31 and the inlet of the second valve 32; the volume of the gas tank 51 is 100mL, the ratio of the volume of the gas tank to the critical value of 50mL for the larger volume and the smaller volume is 2, and is more than 1.5; the pressure sensor 61 monitors the pressure in the gas tank 51 in real time.
The gas enrichment method provided by the embodiment of the invention comprises the following steps:
when the sampling volume is large: the volume is more than 50mL, namely the critical value of the larger volume and the smaller volume in the embodiment is 50mL, and the multi-way valve, the first valve and the second valve are switched to disconnect the enrichment pipe and the gas tank and disconnect the flow meter and the gas tank;
under the suction of a pump, sample gas enters an enrichment pipe through the multi-way valve, then flows through a first valve, a second valve and a flowmeter in sequence, the flowmeter is used for metering the volume of the sample gas entering the enrichment pipe, when the output value of the flowmeter reaches a set value, such as 55mL, 60mL, 100mL and 200mL, the multi-way valve is switched, and the pump stops working;
when the sampling volume is smaller, namely less than 10mL, such as 20mL, 350mL and 50mL, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected;
under the suction of the pump, the gas in the gas tank flows through the second valve and the flowmeter in sequence, and the pressure in the gas tank is reduced;
the first valve and the second valve are switched to disconnect the gas tank from the flow meter;
sample gas flows through the enrichment pipe, the first valve and the proportional valve in sequence, the proportional valve is used for adjusting the gas inflow, the sample gas enters the gas tank, and the pressure in the gas tank is increased;
a pressure sensor monitors the pressure in the gas canister during the gas canister venting and intake;
in the above process, when the sampling volume is small, the enriched sample gas volume
V0Volume of gas to discharge the gas tank, P0At atmospheric pressure, P1Is the pressure of the gas tank after the gas is discharged, P2The pressure of the gas tank after the gas enters the gas tank;
if the sampling volume V is 20mL, the sampling volume pumped by the air pressure tank is cumulatively determined by the mass flowmeter to be V0When the volume is 30ml (20ml multiplied by 1.5 times), the process of vacuumizing the gas storage tank is finished, and the pressure in the gas tank is reduced to P1，P0Is the local atmospheric pressure 101.325 kPa. When the flow path is switched to the enriching pipe, the first valve and the proportional valve, 20 to 30 (P) is calculated2-P1)/(101.325-P1) P of2Value when the pressure in the gas tank reaches P2And when the gas is enriched, switching the multi-way valve to finish the gas enrichment.
The above embodiment shows the critical value of 50mL by way of example only, but other critical values, such as 48mL, can be used, and the critical value is about 50 mL.
Claims (8)
1. A gas enrichment method, comprising:
when the sampling volume is larger, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected, and the flow meter and the gas tank are disconnected;
under the suction of a pump, sample gas enters an enrichment pipe by using the multi-way valve, then sequentially flows through a first valve, a second valve and a flowmeter, and the volume of the sample gas entering the enrichment pipe is measured by using the flowmeter;
when the sampling volume is smaller, the multi-way valve, the first valve and the second valve are switched, so that the enrichment pipe and the gas tank are disconnected,
under the suction of the pump, the gas in the gas tank flows through the second valve and the flowmeter in sequence, and the pressure in the gas tank is reduced;
the first valve and the second valve are switched to disconnect the gas tank from the flow meter;
sample gas sequentially flows through the enrichment pipe and the first valve and enters the gas tank, and the pressure in the gas tank is increased;
a pressure sensor monitors the pressure within the gas canister during both venting and intake of the gas canister.
2. The gas enrichment method of claim 1, wherein the enriched sample gas volume is smaller when the sampling volume is smaller
V0Volume of gas to discharge the gas tank, P0At atmospheric pressure, P1Is the pressure of the gas tank after the gas is discharged, P2Is the pressure of the gas tank after entering the gas.
3. The gas enrichment method of claim 2, wherein the ratio of the volume of the gas tank to the volume of the sample gas V is greater than 1.5.
4. The gas enrichment method of claim 1, wherein the inlet gas flow rate is regulated with a proportional valve in the inlet of the gas tank.
5. The gas enrichment method of claim 1, wherein the first and second valves employ a two-position, three-way valve such that the enrichment tube selectively communicates the second valve with a gas tank and the flow meter selectively communicates the first valve with a gas tank.
6. The gas enrichment method of claim 1, wherein the larger volume is 50mL or more and the smaller volume is 50mL or less.
7. A gas enrichment device comprising a multi-way valve, an enrichment tube, and a flow meter; characterized in that the gas enrichment device further comprises:
a first valve for selectively communicating the enrichment tube with the gas tank and a first inlet of the first valve, and a second valve for selectively communicating a flow meter downstream of the second valve with the first inlet and the gas tank;
the gas tank is communicated with the outlet of the first valve and the second inlet of the second valve respectively;
a pressure sensor for monitoring the pressure within the gas canister.
8. The gas enrichment device of claim 7, further comprising:
and one end of the proportional valve is communicated with the gas tank, and the other end of the proportional valve is respectively communicated with the outlet of the first valve and the second inlet of the second valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011600360.7A CN112816272A (en) | 2020-12-30 | 2020-12-30 | Gas enrichment method and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011600360.7A CN112816272A (en) | 2020-12-30 | 2020-12-30 | Gas enrichment method and device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112816272A true CN112816272A (en) | 2021-05-18 |
Family
ID=75855347
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011600360.7A Pending CN112816272A (en) | 2020-12-30 | 2020-12-30 | Gas enrichment method and device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112816272A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514651A (en) * | 2021-06-15 | 2021-10-19 | 杭州谱育科技发展有限公司 | Gas sampling device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0886778A (en) * | 1994-09-16 | 1996-04-02 | Nippon Sanso Kk | Method and device for enrichment analysis |
| CN103575834A (en) * | 2012-08-01 | 2014-02-12 | 中国石油化工股份有限公司 | Enrichment device and enrichment method for light hydrocarbon in dry gas |
| CN210427480U (en) * | 2019-06-28 | 2020-04-28 | 南京霍普斯科技有限公司 | Volatile organic pollutant on-line monitoring system in ambient air |
| CN111766357A (en) * | 2020-07-07 | 2020-10-13 | 安徽皖仪科技股份有限公司 | System and method for continuously and automatically monitoring VOCs in water |
| CN212110863U (en) * | 2020-04-08 | 2020-12-08 | 山东省科学院海洋仪器仪表研究所 | In-situ extraction, enrichment and sampling device for organic pollutants in seawater |
-
2020
- 2020-12-30 CN CN202011600360.7A patent/CN112816272A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0886778A (en) * | 1994-09-16 | 1996-04-02 | Nippon Sanso Kk | Method and device for enrichment analysis |
| CN103575834A (en) * | 2012-08-01 | 2014-02-12 | 中国石油化工股份有限公司 | Enrichment device and enrichment method for light hydrocarbon in dry gas |
| CN210427480U (en) * | 2019-06-28 | 2020-04-28 | 南京霍普斯科技有限公司 | Volatile organic pollutant on-line monitoring system in ambient air |
| CN212110863U (en) * | 2020-04-08 | 2020-12-08 | 山东省科学院海洋仪器仪表研究所 | In-situ extraction, enrichment and sampling device for organic pollutants in seawater |
| CN111766357A (en) * | 2020-07-07 | 2020-10-13 | 安徽皖仪科技股份有限公司 | System and method for continuously and automatically monitoring VOCs in water |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113514651A (en) * | 2021-06-15 | 2021-10-19 | 杭州谱育科技发展有限公司 | Gas sampling device and method |
| CN113514651B (en) * | 2021-06-15 | 2024-05-14 | 杭州谱育科技发展有限公司 | Gas sampling apparatus and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4823591A (en) | Calibration method for exhaust mass flow measuring system | |
| US6200819B1 (en) | Method and apparatus for providing diluent gas to exhaust emission analyzer | |
| US7281440B2 (en) | Particulate sampling system having flow check device | |
| US11874199B2 (en) | Device and process for determining the size of a leak hole in a sample | |
| JP2001507458A (en) | Flow control and measurement correction in an emission analyzer based on water content | |
| US6112574A (en) | Exhaust gas analyzer and modal mass analysis method by gas trace process using the analyzer thereof | |
| CN103759906B (en) | Device and method based on static expanding method vacuum standard calibration vacuum leak | |
| JP2019086371A (en) | Gas analyzer calibration method, gas analysis system, and pressure change device | |
| CN112816272A (en) | Gas enrichment method and device | |
| CN112255355A (en) | Non-methane total hydrocarbon analysis method | |
| CN213903428U (en) | Non-methane total hydrocarbon analysis device | |
| CN209513370U (en) | A kind of gasometry sampling analysis device | |
| CN108254034B (en) | Online metering device and metering method for oil-gas-water split-phase flow | |
| CN113740552B (en) | Sample injection system with gas distribution function | |
| CN212180747U (en) | Gas divider | |
| CN216208027U (en) | High-precision dilution instrument | |
| CN219161780U (en) | Pretreatment system for diluting concentration of liquid sample in proportion | |
| CN206823562U (en) | A kind of laboratory air membrane separating property determines device | |
| CN219084874U (en) | Dynamic gas dilution device for malodor determination and malodor dynamic sniffing instrument | |
| CN212275679U (en) | Portable concentration meter | |
| CN218107566U (en) | High-precision static dilution instrument | |
| CN215985451U (en) | Pretreatment structure for dilution sampling analysis | |
| CN215586005U (en) | Hybrid gas distribution device and system | |
| JP2001264223A (en) | Sampling device for exhaust gas | |
| CN210021993U (en) | Gas diluting device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |