CN101183036A - Gas valve online quick-speed leak detection method - Google Patents
Gas valve online quick-speed leak detection method Download PDFInfo
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- CN101183036A CN101183036A CNA2007100324091A CN200710032409A CN101183036A CN 101183036 A CN101183036 A CN 101183036A CN A2007100324091 A CNA2007100324091 A CN A2007100324091A CN 200710032409 A CN200710032409 A CN 200710032409A CN 101183036 A CN101183036 A CN 101183036A
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Abstract
The invention discloses an online rapid leak detection method for a fuel gas valve. Appropriate trace gas is selected and the certain pressure difference of the two sides of the valve can be maintained, moreover, trace gas is added into one side of the valve; the other side of the valve collects and enriches trace gas; an appropriate method is selected to detect the trace gas; the detected result is adopted to determine whether the valve has inner leakage or not. The method of the invention has high accuracy and sensitivity, when in the inner leakage detection of the valve, gas stopping and fuel gas discharging cannot be conducted, with safety, environmental protection, energy saving, time saving and fuel gas saving; the invention can effectively improve implementation frequency and increase the safety of fuel gas production, transmission and distribution as well as gas utilization by the user; moreover, the invention can match with a vehicle-mounted gas chromatographic instrument and realize the complete, continuous and systemic detection of the whole fuel gas transmission and distribution system.
Description
Technical field
The present invention relates to a kind of detection method, the method for the online quick leak-checking of particularly a kind of burnt gas valve.
Background technology
Burnt gas valve is the critical facility of gas ductwork, works the combustion gas of isolating different medium or cuts off effect such as combustion gas conveying, if valve is owing to be not closed completely, interior leakage conductance causes gas blowby, with affects safety production and safe handling.In order to ensure that production and user use gas safety, must in time check the valves leakage situation of finding.
Valve online test method at present commonly used is that valve one side keeps certain pressure, opposite side emptying combustion gas, and making pressure reduce near gauge pressure is zero, changes and judges in whether this valve and leak by observing low pressure one wall pressure.There is low, the consuming time length of sensitivity in this method, wastes energy, contaminated environment, influence shortcomings such as continous-stable air feed.In order to improve valve online measuring technique level, reduce and pollute, energy savings, be necessary to develop a kind of fast, do not stop the supple of gas or steam, the detection method of highly sensitive science more, carry out with guarantee that the burnt gas valve leak detection is former can to keep the continuous air feed of safety and stability.
Summary of the invention
The purpose of this invention is to provide a kind of gas valve online quick-speed leak detection method, realized under the situation of not stopping the supple of gas or steam, carrying out the valve leak detection, quick, cleaning, highly sensitive.
Technical scheme of the present invention provides a kind of gas valve online quick-speed leak detection method, may further comprise the steps:
(1) keeps the certain pressure reduction in valve both sides;
(2) add tracer gas in valve one side;
(3) collect and the enrichment tracer gas at the valve opposite side;
(4) detection of tracer gas.
The described valve of step (1) both sides pressure reduction is 0.03～0.04Mpa.
Described tracer gas is a dimethyl ether.
Described tracer gas addition is 100g～20000g.
The collection of the described tracer gas of step (3) is to collect behind the 1min after adding tracer gas.
The enrichment of the described tracer gas of step (3) is to adopt Drexel bottle to absorb tracer gas.
It is 120L/h that gas flow is collected in described Drexel bottle, and the absorbing agent volume is 200ml.
Described absorbing agent is a water.
The gas chromatography of hydrogen flame detector is adopted in the detection of the described tracer gas of step (4).
Described hydrogen flame detector adopts vehicle-mounted flow detection.
The invention has the beneficial effects as follows:
(1) the present invention adopts under the situation of normal air feed, the valve both sides keep certain pressure reduction, and a side higher at pressure adds probe material, at the lower side-draw sample of pressure, divide contained probe material in the gassing sample, can judge in whether valve according to testing result and leak.Needn't stop the supple of gas or steam, discharge combustion gas when detecting valves leakage, safety, environmental protection, energy-conservation, save time, save combustion gas.
(2) accuracy of the present invention and sensitivity are higher, continuous, economical, also reduce human cost, have improved work efficiency, make valve leak detection work become simple, can improve the enforcement frequency effectively, increase the safety of combustion gas production, transmission ﹠ distribution, user's usefulness gas.
(3) can the vehicle-mounted gas chromatographicanalyzer of supporting use, realize the complete inspection work of whole piece gas transmission and distribution system continuous system.
Description of drawings
Leakage method synoptic diagram in the online detection burnt gas valve of Fig. 1
Embodiment
The online quick leak-checking of a kind of burnt gas valve system as shown in Figure 1 comprises the aerator, regulator, gas extractor 5 and the pick-up unit 6 that are connected by gas pipeline.Aerator comprises tracer gas gas cylinder, tracer gas admission line 1 and adds air valve 2.Regulator comprises valve 3, valve 12 and pressure test device 4, the pressure reduction of regulating burnt gas valve 11 both sides that need the interior leakage situation of detection is P1＞P2, open the tracer gas gas cylinder then, unlatching adds air valve 2, tracer gas by air intake opening 1 by pipeline 9, valve to be checked 11 pipeline 10 of flowing through, logical tracer gas is opened valve 7 after about 1 minute, tracer gas is collected and enrichment by gas extractor Drexel bottle 5 through pipeline 8, detects the interior leakage situation that tracer gas content is judged valve to be checked by pick-up unit hydrogen flame detector 6 again.In order to cooperate the complete inspection work of whole piece gas transmission and distribution system continuous system, can adopt vehicle-mounted mobile hydrogen flame detector.
(1) keeps the certain pressure reduction in valve both sides
Under the situation of normal air feed, the certain pressure reduction of valve-off and maintenance valve both sides as Fig. 1, keeps P1＞P2, and selecting P1 and P2 difference is 0.02Mpa.
(2) add tracer gas;
The side P1 end higher at pressure adds tracer gas, and the tracer gas addition is 20000～21000g.
Probe material must have inertia, is difficult for autoxidation, non-corrosiveness, safety, does not influence gas quality.And probe material also must be not exist in combustion gas, is gas under the normal temperature and pressure, so just can reach the analysis requirement.By the screening to big quantity of material, the applicant has selected ether material as tracer gas.Through the long-term a large amount of experiment of applicant, a kind of gas investigation, at first selected dimethyl ether is as tracer gas.
(3) collection of tracer gas and enrichment;
Collect tracer gas at the lower side P2 end of pressure and adopt the Drexel bottle sampling, it is 120L/h that gas flow is collected in Drexel bottle, and the volume of Drexel bottle absorbing agent water is 200ml.
After tracer gas adds combustion gas, because the spike gas that leakage valve leaked is very low through a large amount of coal gas dilute concentrations, and all gases complicated component in the coal gas, if it is low directly to analyze then sensitivity, therefore we must remove other interference components simultaneously to the enrichment of spike gas when collected specimens.Gas composition gas solubleness in water is very low, and used spike gas has bigger solubleness in water, by a large amount of experiments, the applicant has used Drexel bottle enrichment spike gas, Drexel bottle is the Drexel bottle that normal experiment is used, can buy everywhere on the market, cheap practical, but this simple Drexel bottle allows collecting work become simple and safe.
(4) detection of tracer gas.
Employing has the gas chromatography of very highly sensitive hydrogen flame detector to divide to organism whether to contain probe material in the gassing sample, judge in whether valve with this and to leak, the gas chromatographicanalyzer of hydrogen flame detector can be loaded on the vehicle, realizes the mobile on-line determination of whole piece gas transmission and distribution system.
Through overtesting, each valve institute spike expense is no more than 50 yuan, is no more than 30 minutes analysis time, and accuracy reaches more than 98%.
Operation steps is with embodiment 1, and keeping valve both sides P1 and P2 difference is 0.05Mpa, and the side P1 end higher at pressure adds tracer gas, and the tracer gas addition is 80g～100g.Other operations are collected and the enrichment tracer gas with embodiment 1, adopt the gas chromatography analysis.
(1) keeps the certain pressure reduction in valve both sides
Under the situation of normal air feed, the certain pressure reduction of valve-off and maintenance valve both sides as Fig. 1, keeps P1＞P2, and keeping P1 and P2 difference is 0.03～0.04Mpa.
(2) add tracer gas;
The side P1 end higher at pressure adds tracer gas, and the tracer gas addition is 200g～300g.
Probe material must have inertia, is difficult for autoxidation, non-corrosiveness, safety, does not influence gas quality.And probe material also must be not exist in combustion gas, is gas under the normal temperature and pressure, so just can reach the analysis requirement.By the screening to big quantity of material, the applicant has selected ether material as tracer gas.Through the long-term a large amount of experiment of applicant, a kind of gas investigation, at first selected dimethyl ether is as tracer gas.
(3) collection of tracer gas and enrichment;
Collect tracer gas at the lower side P2 end of pressure and adopt the Drexel bottle sampling, it is 120L/h that gas flow is collected in Drexel bottle, and the volume of Drexel bottle absorbing agent water is 200ml.
After tracer gas adds combustion gas, because the spike gas that leakage valve leaked is very low through a large amount of coal gas dilute concentrations, and all gases complicated component in the coal gas, if it is low directly to analyze then sensitivity, therefore we must remove other interference components simultaneously to the enrichment of spike gas when collected specimens.Gas composition gas solubleness in water is very low, and used spike gas has bigger solubleness in water, by a large amount of experiments, the applicant has used Drexel bottle enrichment spike gas, Drexel bottle is the Drexel bottle that normal experiment is used, can buy everywhere on the market, cheap practical, but this simple Drexel bottle allows collecting work become simple and safe.
(4) detection of tracer gas.
Employing has the gas chromatography of very highly sensitive hydrogen flame detector to divide to organism whether to contain probe material in the gassing sample, judge in whether valve with this and to leak, the gas chromatographicanalyzer of hydrogen flame detector can be loaded on the vehicle, realizes the mobile on-line determination of whole piece gas transmission and distribution system.
Through overtesting, each valve institute spike expense is no more than 50 yuan, is no more than 30 minutes analysis time, and accuracy reaches more than 98%.
Claims (10)
1. gas valve online quick-speed leak detection method is characterized in that may further comprise the steps:
(1) keeps the certain pressure reduction in valve both sides;
(2) add tracer gas in valve one side;
(3) collect and the enrichment tracer gas at the valve opposite side;
(4) detection of tracer gas.
2. gas valve online quick-speed leak detection method according to claim 1 is characterized in that the described valve of step (1) both sides pressure reduction is 0.03～0.04Mpa.
3. gas valve online quick-speed leak detection method according to claim 1 is characterized in that described tracer gas is a dimethyl ether.
4. according to claim 1 or 3 described gas valve online quick-speed leak detection methods, it is characterized in that described tracer gas addition is 100g～20000g.
5. gas valve online quick-speed leak detection method according to claim 1 is characterized in that the collection of the described tracer gas of step (3) is to collect behind the 1min after adding tracer gas.
6. gas valve online quick-speed leak detection method according to claim 1, the enrichment that it is characterized in that the described tracer gas of step (3) are to adopt Drexel bottle to absorb tracer gas.
7. gas valve online quick-speed leak detection method according to claim 6 is characterized in that it is 120L/h that gas flow is collected in described Drexel bottle, and the absorbing agent volume is 200ml.
8. gas valve online quick-speed leak detection method according to claim 6 is characterized in that described absorbing agent is a water.
9. gas valve online quick-speed leak detection method according to claim 1, the gas chromatography of hydrogen flame detector is adopted in the detection that it is characterized in that the described tracer gas of step (4).
10. gas valve online quick-speed leak detection method according to claim 9 is characterized in that described hydrogen flame detector adopts vehicle-mounted flow detection.
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| CN2007100324091A CN101183036B (en) | 2007-12-13 | 2007-12-13 | Gas valve online quick-speed leak detection method |
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| CN2007100324091A CN101183036B (en) | 2007-12-13 | 2007-12-13 | Gas valve online quick-speed leak detection method |
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| CN101183036B CN101183036B (en) | 2011-06-29 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539074A (en) * | 2011-12-15 | 2012-07-04 | 宁夏电力公司电力科学研究院 | Leakage detecting method of hydrogen system for coal-fired power generator |
| CN104819836A (en) * | 2015-05-06 | 2015-08-05 | 西安航空制动科技有限公司 | Method for verifying internal leakage fault of aircraft brake valve |
| CN104880302A (en) * | 2015-04-23 | 2015-09-02 | 西安航空制动科技有限公司 | Method of determining hardness and roughness of cooperation surface of valve core and valve pocket of airplane brake valve |
| CN105928697A (en) * | 2016-06-17 | 2016-09-07 | 上海新力动力设备研究所 | Gas valve response time measuring device and method |
| CN107165731A (en) * | 2017-07-21 | 2017-09-15 | 中国第汽车股份有限公司 | The detection method of leakage in natural gas engine pressure reducer stop valve |
| CN107850508A (en) * | 2015-07-20 | 2018-03-27 | 普发真空公司 | Equipment for the method for the leak tightness of examining sealed product and for detecting leakage |
| CN109000918A (en) * | 2018-09-21 | 2018-12-14 | 中国船舶重工集团公司第七研究所 | Gas engine electric-controlled gas sprays valve test device and its test method |
| CN110411735A (en) * | 2019-07-15 | 2019-11-05 | 合肥通用机械研究院有限公司 | A kind of Subzero valve simulation duty testing device |
| CN110411676A (en) * | 2019-07-15 | 2019-11-05 | 合肥通用机械研究院有限公司 | A kind of valve leak amount detecting device |
| CN111707466A (en) * | 2020-06-29 | 2020-09-25 | 中山市优梦自动化设备有限公司 | Automatic detection equipment for aluminum valve |
| CN111964845A (en) * | 2020-08-25 | 2020-11-20 | 中国矿业大学 | Air leakage detection device and method for vertical air shaft explosion door |
| CN112228147A (en) * | 2020-10-20 | 2021-01-15 | 中国矿业大学(北京) | Rapid and remote fire disaster situation distinguishing method based on trace gas method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US6851316B2 (en) * | 2003-01-27 | 2005-02-08 | The Boc Group, Inc. | Apparatus and method for recovery and recycle of tracer gas from leak testing process with randomly varying demand |
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2007
- 2007-12-13 CN CN2007100324091A patent/CN101183036B/en active Active
Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539074A (en) * | 2011-12-15 | 2012-07-04 | 宁夏电力公司电力科学研究院 | Leakage detecting method of hydrogen system for coal-fired power generator |
| CN104880302A (en) * | 2015-04-23 | 2015-09-02 | 西安航空制动科技有限公司 | Method of determining hardness and roughness of cooperation surface of valve core and valve pocket of airplane brake valve |
| CN104880302B (en) * | 2015-04-23 | 2017-04-12 | 西安航空制动科技有限公司 | Method of determining hardness and roughness of cooperation surface of valve core and valve pocket of airplane brake valve |
| CN104819836A (en) * | 2015-05-06 | 2015-08-05 | 西安航空制动科技有限公司 | Method for verifying internal leakage fault of aircraft brake valve |
| CN104819836B (en) * | 2015-05-06 | 2017-04-12 | 西安航空制动科技有限公司 | Method for verifying internal leakage fault of aircraft brake valve |
| CN107850508B (en) * | 2015-07-20 | 2020-06-05 | 普发真空公司 | Method for checking the tightness of a sealed product and device for detecting leaks |
| CN107850508A (en) * | 2015-07-20 | 2018-03-27 | 普发真空公司 | Equipment for the method for the leak tightness of examining sealed product and for detecting leakage |
| CN105928697A (en) * | 2016-06-17 | 2016-09-07 | 上海新力动力设备研究所 | Gas valve response time measuring device and method |
| CN105928697B (en) * | 2016-06-17 | 2019-06-11 | 上海新力动力设备研究所 | A kind of gas valve response time measuring device and method |
| CN107165731A (en) * | 2017-07-21 | 2017-09-15 | 中国第汽车股份有限公司 | The detection method of leakage in natural gas engine pressure reducer stop valve |
| CN107165731B (en) * | 2017-07-21 | 2019-06-07 | 中国第一汽车股份有限公司 | The detection method leaked in natural gas engine pressure reducer shut-off valve |
| CN109000918A (en) * | 2018-09-21 | 2018-12-14 | 中国船舶重工集团公司第七研究所 | Gas engine electric-controlled gas sprays valve test device and its test method |
| CN110411676A (en) * | 2019-07-15 | 2019-11-05 | 合肥通用机械研究院有限公司 | A kind of valve leak amount detecting device |
| CN110411735A (en) * | 2019-07-15 | 2019-11-05 | 合肥通用机械研究院有限公司 | A kind of Subzero valve simulation duty testing device |
| CN111707466A (en) * | 2020-06-29 | 2020-09-25 | 中山市优梦自动化设备有限公司 | Automatic detection equipment for aluminum valve |
| CN111964845A (en) * | 2020-08-25 | 2020-11-20 | 中国矿业大学 | Air leakage detection device and method for vertical air shaft explosion door |
| CN112228147A (en) * | 2020-10-20 | 2021-01-15 | 中国矿业大学(北京) | Rapid and remote fire disaster situation distinguishing method based on trace gas method |
| CN112228147B (en) * | 2020-10-20 | 2021-09-17 | 中国矿业大学(北京) | Rapid and remote fire disaster situation distinguishing method based on trace gas method |
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| CN101183036B (en) | 2011-06-29 |
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Address after: 510623, room 3, 2301 Linjiang Road, Guangzhou, Guangdong, Tianhe District Co-patentee after: South China University of Technology Patentee after: Guangzhou Gas Group Co., Ltd. Address before: 510060, one of No. 416 East Ring Road, Guangzhou, Guangdong Co-patentee before: South China University of Technology Patentee before: Gas Co., Ltd. of Guangzhou City |
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