CN105021356A - Test method for detecting leakage of hydrogen system of hydrogen-cooled generator - Google Patents
Test method for detecting leakage of hydrogen system of hydrogen-cooled generator Download PDFInfo
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Abstract
The invention relates to a test method for detecting leakage of a hydrogen system of a hydrogen-cooled generator. The test method comprises the steps that (1) detection instruments are selected and matched, and performance parameters of the detection instruments are determined; (2) according to the practical condition of leakage detection of a power plant, a helium inflation system of the generator is prepared; (3) environmental condition of detection is confirmed; (4) a detection portion of the detected hydrogen system is selected and confirmed; (5) certain quantity of high-purity helium is inflated into the hydrogen system of the generator; (6) leakage detector for the hydrogen system is carried out in a positive pressure test method; and (7) independent leakage detection points are detected one by one, detection data is recorded, and whether leakage occurs in the hydrogen system of the hydrogen-cooled generator is determined. According to the system, the special-purposed helium inflation system of the generator is prepared, the working efficiency and the test precision are improved, and good basis is provided for fault diagnosis of the hydrogen system.
Description
Technical field
The invention belongs to large-scale hydrogen gas system leak detection technology field, particularly a kind of test method detecting hydrogen-cooled generator hydrogen gas system and leak.
Background technology
The generator of most domestic Thermal Power Station all adopts the water hydrogen hydrogen type of cooling.Generator hydrogen gas system leaks a great problem that hydrogen is the unit safety stable operation of puzzlement domestic electricity power enterprise always, and the size of Generator Hydrogen Leakage amount directly has influence on the safe and stable operation of genset, and this is also the important indicator that engine health is evaluated.At present, the detection experiment method of comparative maturity, system is leaked less than large-scale hydrogen gas systems such as the generators for the water hydrogen hydrogen type of cooling.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, and propose a kind of test method detecting hydrogen-cooled generator hydrogen gas system and leak.
The present invention solves its technical matters and takes following technical scheme to realize:
Detect the test method that hydrogen-cooled generator hydrogen gas system is leaked, comprise step as follows:
(1) adopt helium mass spectrometer leak detecting technology, carry out the type selecting of detecting instrument and supporting, to guarantee that instrument normally runs in testing environment, and consider the performance parameter of instrument, meet the demand of Site Detection;
(2) according to the actual conditions of generating plant leak detection test, preparation generator helium gas charging system;
(3) the confirmation of sense environmental conditions;
(4) detect position to tested hydrogen gas system carry out selecting and confirm;
(5) quantitative high-purity helium is filled with to generator hydrogen gas system inside;
(6) adopt malleation method of testing to carry out method to the leak detection test of hydrogen gas system;
(7) detecting detecting separately leakage point one by one, then record being carried out to detection data, detection data being divided into especially big leakage, leaking greatly, middle leakage, little leakage and micro-leakage five grades, completing the judgement that hydrogen-cooled generator hydrogen gas system is leaked.
And, described step (1) in, when instrument is supporting, preparation 28 meters of probes are selected to add long sucking pipe, 28 meters of displays extend cable, in testing helium mass spectrometer leak detector is divided into three parts, main frame is positioned over generator platform, by being connected to 28 meters of suction gun probes adding long sucking pipe, measured point is tested, during test, instrument display separates with main frame, extends cable and is connected with main frame, detect the requirement that instrument used must meet test item by 28 meters of displays, within the calibration interval, and meet following accuracy requirement:
1. leak locator is by conventional leak detection mode under full pumping speed condition, and the minimum detectable leak rate of leak detection is not more than 2 × 10
-11pam
3s
-1;
2. leak locator leak rate: allow systematic error to be ± 1.5%;
And in described step (2), preparation generator helium gas charging system, this system comprises: small-sized aluminium alloy gas cylinder, reduction valve and 2 meters of inflation sebific ducts.
And, described step (3) in, the sense environmental conditions that need confirm specifically comprises:
1. leak rate detects and normally need run in generator hydrogen gas system and generator sealing oil system;
2. the condition that detecting instrument meets specifically comprises: the temperature requirement meeting testing environment, the relative humidity meeting testing environment require and meets the atmospheric pressure requirement of testing environment, meet without strong-electromagnetic field requirement, meet without strenuous vibration requirement, meet non-corrosiveness demand.
And, described step (4) in, tested generator hydrogen gas system detects position and comprises following content: the outgoing line porcelain bushing pipe of engine block, outlet hood, temperature element binding post plate, hydrogen-cooled device cover, generator ' s cover and generator sealing bearing bush, hydrogen gas system comprises: hydrogen drying unit, hydrogen gas system purity instrument, hydrogen gas system hygronom, hydrogen gas system blowdown warning device and hydrogen gas system displacement apparatus, comprises pipe valve and flange that engine block is connected with hydrogen gas system simultaneously.
And, described step (6) in, malleation method of testing refers to after generator hydrogen gas system inside is filled with quantitative high-purity helium, the malleation mixed gas containing finite concentration helium is formed in internal system, mixed gas will leak in external environment condition by leakage point under the effect of malleation, now, leakage will be detected by leak locator suction gun detection probe close to these leakage points.
And, described step (7) in, after separately detecting leakage point, instrument display leak rate maximal value is this check point measurement data, and detection probe is recovered away from leakage point after measuring by independent check point, determine release time, then carry out next independent check point and detect.
Advantage of the present invention and good effect are:
1, the present invention is directed to the detection that hydrogen-cooled generator hydrogen gas system is leaked, adopt helium mass spectrometer leak detecting technology, carried out type selecting and the auxiliary work of checkout equipment, added necessary instrument annex.Prepare special generator helium gas charging system, improve work efficiency.
2, the present invention is according to leak detection test data, and research sums up leakage class, is convenient to the degree that judges to leak and processes the size adopting an effective measure of equipment impact.Adopt this cover system, tester can observe directly test result, improves measuring accuracy.Give full play of the function of checkout equipment, for good basis is laid in the research work carrying out generator hydrogen gas system fault diagnosis better.
Embodiment
Be further described the invention process below, following examples are descriptive, are not determinate, can not limit protection scope of the present invention with this.
A kind of test method detecting hydrogen-cooled generator hydrogen gas system and leak, as shown in Figure 1, the hardware system that the method uses comprises: helium mass spectrometer leak detector main frame, 28 meters add long sucking pipe and suction gun probe, 28 meters extend cables and display remote controller, generator helium gas charging system comprises small-sized aluminium alloy gas cylinder, reduction valve, 2 meters of inflation sebific ducts and related accessory, it is as follows that the method comprising the steps of:
(1) adopt helium mass spectrometer leak detecting technology, carry out the type selecting of detecting instrument and supporting, need consider instrument use in environment and condition, select rational accessory, to guarantee that instrument normally runs in testing environment, and consider that the Specifeca tion speeification of instrument can meet the demand of Site Detection.When instrument is supporting, consider condition of work during on-the-spot test, select to have prepared 28 meters of probes and add long sucking pipe, 28 meters of displays extend the crucial accessories such as cable.In testing helium mass spectrometer leak detector is divided into three parts, main frame is positioned over generator platform and is convenient to check and operation, by being connected to 28 meters of suction gun probes adding long sucking pipe, measured point is tested, during test, instrument display and main frame separate and extend cable by 28 meters of displays and main frame is connected, so just can accomplish that test point is synchronous with display, test, to where where display just follows, detects timely observation test result at any time.
Detect the requirement that instrument used should be able to meet test item, instrument must be intact, within the calibration interval, and meets following accuracy requirement:
● the minimum detectable leak rate of leak locator: leak locator is by conventional leak detection mode under full pumping speed condition, and the minimum detectable leak rate of leak detection is not more than 2 × 10
-11pam
3s
-1(to air).
● leak locator leak rate: allow systematic error to be ± 1.5%.
● the measuring error scope of this detection regulation refers to the leak rate error range of display system, and it represents the possible difference recorded between leak rate and actual leak rate.
(2) according to the actual conditions of generating plant leak detection test, preparation generator helium gas charging system, need when considering generator leak detection test to be filled with quantitative helium to generator hydrogen gas system inside, prepare: small-sized aluminium alloy gas cylinder, reduction valve, 2 meters of inflation sebific ducts, constitute generator helium gas charging system, can conveniently be filled with carrying out helium in generator hydrogen gas system before testing.
(3) the confirmation of sense environmental conditions, the sense environmental conditions that need confirm comprises: 1. leak rate detect need in generator hydrogen gas system and generator sealing oil system normally run, or be replaced as carbon dioxide (or air) in hydrogen gas system and maintain in system normally operating pressure generator sealing oil system afterwards and normally run; 2. detecting instrument condition of work should meet the demands, and comprises the temperature of testing environment, relative humidity and atmospheric pressure etc. further and meets the demands, neighbouring without strong-electromagnetic field, without strenuous vibration, and non-corrosiveness gas etc.
(4) detect position to tested hydrogen gas system carry out selecting and confirm, tested generator hydrogen gas system detects position and generally comprises following content: engine block aspect, as outgoing line porcelain bushing pipe, outlet hood, temperature element binding post plate, hydrogen-cooled device cover, generator ' s cover, generator sealing bearing bush, hydrogen drying unit, hydrogen gas system purity instrument, hydrogen gas system hygronom, hydrogen gas system blowdown warning device, hydrogen gas system displacement apparatus etc., and pipe valve, flange etc. that above system is connected;
(5) quantitative high-purity helium is filled with to generator hydrogen gas system inside, need during generator leak detection test to be filled with quantitative helium to generator hydrogen gas system inside, according to tested generator hydrogen gas system internal capacity, generator helium gas charging system is used to be filled with high-purity helium of certain volume fraction to generator hydrogen gas system inside.
(6) the leak detection test philosophy aspect of hydrogen gas system is adopted to the method for malleation test, malleation method of testing refers to after generator hydrogen gas system inside is filled with quantitative high-purity helium, the malleation mixed gas containing finite concentration helium is formed in internal system, mixed gas will leak in external environment condition by leakage point under the effect of malleation, now, will be detected close to these leakage points by leak locator suction gun detection probe.
(7) carry out track record to detection data, after leakage point being detected separately, instrument display leak rate maximal value is this check point measurement data, and record.Again according to the data of leak detection test display, be divided into especially big leakage, large leakage, middle leakage, little leakage, micro-leakage is totally five grades, facilitate the degree judging to leak and the size that equipment is affected like this, when accurately judging that leak source carries out repetition measurement examination, improve repeatability and the comparability of leak source, being convenient to adopt an effective measure processes.And separately check point is measured complete detection system and detection probe need be removed and recover away from leakage point, measures numerical value magnitude and determines release time, be recovered on request and can carry out next measuring point detection depending on this point.
Leak rate classification is pressed to test data:
● the order of magnitude is <1 × 10
-7pam
3s
-1leakiness is micro-leakage;
● the order of magnitude is <1 × 10
-6,>=1 × 10
-7pam
3s
-1, leakiness is little leakage;
● the order of magnitude is <1 × 10
-5,>=1 × 10
-6pam
3s
-1, leakiness is middle leakage;
● the order of magnitude is <1 × 10
-4,>=1 × 10
-5pam
3s
-1, leakiness is large leakage;
● the order of magnitude is>=1 × 10
-4pam
3s
-1leakiness is especially big leakage.
Independent leakage point is measured complete, and measure numerical value magnitude depending on this point and determine release time, specific requirement is as follows:
● the order of magnitude is 10
-7pam
3s
-1and below, release time is 1 minute;
● the order of magnitude is 10
-6pam
3s
-1, release time is 2 minutes;
● the order of magnitude is 10
-5pam
3s
-1, release time is 3 minutes;
● the order of magnitude is 10
-4pam
3s
-1, release time is 4 minutes;
● the order of magnitude is 10
-3pam
3s
-1and more than, release time is 5 minutes.
Be recovered by above requirement and can carry out next measuring point detection.
Claims (7)
1. detect the test method that hydrogen-cooled generator hydrogen gas system is leaked, it is characterized in that comprising step as follows:
(1) adopt helium mass spectrometer leak detecting technology, carry out the type selecting of detecting instrument and supporting, to guarantee that instrument normally runs in testing environment, and consider the performance parameter of instrument, meet the demand of Site Detection;
(2) according to the actual conditions of generating plant leak detection test, preparation generator helium gas charging system;
(3) the confirmation of sense environmental conditions;
(4) detect position to tested hydrogen gas system carry out selecting and confirm;
(5) quantitative high-purity helium is filled with to generator hydrogen gas system inside;
(6) adopt malleation method of testing to carry out method to the leak detection test of hydrogen gas system;
(7) detecting detecting separately leakage point one by one, then record being carried out to detection data, detection data being divided into especially big leakage, leaking greatly, middle leakage, little leakage and micro-leakage five grades, completing the judgement that hydrogen-cooled generator hydrogen gas system is leaked.
2. the test method of detection hydrogen-cooled generator hydrogen gas system leakage according to claim 1, it is characterized in that: described step (1) in, when instrument is supporting, preparation 28 meters of probes are selected to add long sucking pipe, 28 meters of displays extend cable, in testing helium mass spectrometer leak detector is divided into three parts, main frame is positioned over generator platform, by being connected to 28 meters of suction gun probes adding long sucking pipe, measured point is tested, during test, instrument display separates with main frame, extend cable by 28 meters of displays to be connected with main frame, detect the requirement that instrument used must meet test item, within the calibration interval, and meet following accuracy requirement:
1. leak locator is by conventional leak detection mode under full pumping speed condition, and the minimum detectable leak rate of leak detection is not more than 2 × 10
-11pam
3s
-1;
2. leak locator leak rate: allow systematic error to be ± 1.5%.
3. the test method of detection hydrogen-cooled generator hydrogen gas system leakage according to claim 1, it is characterized in that: in described step (2), preparation generator helium gas charging system, this system comprises: small-sized aluminium alloy gas cylinder, reduction valve and 2 meters of inflation sebific ducts.
4. the detection hydrogen-cooled generator hydrogen gas system according to claim 1 test method of leaking, is characterized in that: described step (3) in, the sense environmental conditions that need confirm specifically comprises:
1. leak rate detects and normally need run in generator hydrogen gas system and generator sealing oil system;
2. the condition that detecting instrument meets specifically comprises: the temperature requirement meeting testing environment, the relative humidity meeting testing environment require and meets the atmospheric pressure requirement of testing environment, meet without strong-electromagnetic field requirement, meet without strenuous vibration requirement, meet non-corrosiveness demand.
5. the test method of detection hydrogen-cooled generator hydrogen gas system leakage according to claim 1, it is characterized in that: described step (4) in, tested generator hydrogen gas system detects position and comprises following content: the outgoing line porcelain bushing pipe of engine block, outlet hood, temperature element binding post plate, hydrogen-cooled device cover, generator ' s cover and generator sealing bearing bush, hydrogen gas system comprises: hydrogen drying unit, hydrogen gas system purity instrument, hydrogen gas system hygronom, hydrogen gas system blowdown warning device and hydrogen gas system displacement apparatus, comprise pipe valve and flange that engine block is connected with hydrogen gas system simultaneously.
6. the test method of detection hydrogen-cooled generator hydrogen gas system leakage according to claim 1, it is characterized in that: described step (6) in, malleation method of testing refers to after generator hydrogen gas system inside is filled with quantitative high-purity helium, the malleation mixed gas containing finite concentration helium is formed in internal system, mixed gas will leak in external environment condition by leakage point under the effect of malleation, now, leakage will be detected by leak locator suction gun detection probe close to these leakage points.
7. the test method of detection hydrogen-cooled generator hydrogen gas system leakage according to claim 1, it is characterized in that: described step (7) in, after independent detection leakage point, instrument display leak rate maximal value is this check point measurement data, after independent check point is measured, detection probe is recovered away from leakage point, determines release time, then carry out next independent check point and detect.
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| CN106053609A (en) * | 2016-06-08 | 2016-10-26 | 徐洪军 | Device for monitoring hydrogen leakage of steam turbine generator set on line on basis of wireless passive technology |
| CN106289665A (en) * | 2016-08-23 | 2017-01-04 | 中国大唐集团科学技术研究院有限公司华东分公司 | A kind of method utilizing tracer to search hydrogen cooled generator group leakage point online |
| CN110887608A (en) * | 2019-11-29 | 2020-03-17 | 国网重庆市电力公司电力科学研究院 | Cable outer sheath damage point live-line detection system and method |
| CN111272349A (en) * | 2019-11-18 | 2020-06-12 | 福建福清核电有限公司 | System and method for verifying air tightness of nuclear power generator in overhauling process |
| CN111458081A (en) * | 2019-01-22 | 2020-07-28 | 西安高压电器研究院有限责任公司 | Dynamic helium mass spectrum leak detection airtightness test method and device for GI L bus |
| CN111579170A (en) * | 2020-05-27 | 2020-08-25 | 国网天津市电力公司电力科学研究院 | Comprehensive leak detection testing device and method for steam turbine vacuum system |
| CN112489381A (en) * | 2020-11-30 | 2021-03-12 | 北京航天试验技术研究所 | Hydrogen leakage detection alarm and event grade estimation method |
| CN113029460A (en) * | 2021-02-03 | 2021-06-25 | 武汉英飞光创科技有限公司 | Leak detection method for optical device |
| CN113984292A (en) * | 2021-09-30 | 2022-01-28 | 北京航天试验技术研究所 | Liquid hydrogen valve leakage detection device and method |
| CN114577409A (en) * | 2020-11-30 | 2022-06-03 | 宝能汽车集团有限公司 | Detection method and detection system for hydrogen leakage rate |
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| CN111458081A (en) * | 2019-01-22 | 2020-07-28 | 西安高压电器研究院有限责任公司 | Dynamic helium mass spectrum leak detection airtightness test method and device for GI L bus |
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| CN110887608A (en) * | 2019-11-29 | 2020-03-17 | 国网重庆市电力公司电力科学研究院 | Cable outer sheath damage point live-line detection system and method |
| CN111579170A (en) * | 2020-05-27 | 2020-08-25 | 国网天津市电力公司电力科学研究院 | Comprehensive leak detection testing device and method for steam turbine vacuum system |
| CN112489381A (en) * | 2020-11-30 | 2021-03-12 | 北京航天试验技术研究所 | Hydrogen leakage detection alarm and event grade estimation method |
| CN114577409A (en) * | 2020-11-30 | 2022-06-03 | 宝能汽车集团有限公司 | Detection method and detection system for hydrogen leakage rate |
| CN113029460A (en) * | 2021-02-03 | 2021-06-25 | 武汉英飞光创科技有限公司 | Leak detection method for optical device |
| CN113029460B (en) * | 2021-02-03 | 2021-12-31 | 武汉英飞光创科技有限公司 | Leak detection method for optical device |
| CN113984292A (en) * | 2021-09-30 | 2022-01-28 | 北京航天试验技术研究所 | Liquid hydrogen valve leakage detection device and method |
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Application publication date: 20151104 |
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