CN2784902Y - Meter for on-line monitoring air leakage of steam turbine vacuum system - Google Patents
Meter for on-line monitoring air leakage of steam turbine vacuum system Download PDFInfo
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- CN2784902Y CN2784902Y CN 200520095271 CN200520095271U CN2784902Y CN 2784902 Y CN2784902 Y CN 2784902Y CN 200520095271 CN200520095271 CN 200520095271 CN 200520095271 U CN200520095271 U CN 200520095271U CN 2784902 Y CN2784902 Y CN 2784902Y
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Abstract
The utility model discloses a meter for monitoring the gas leakage of a steam turbine vacuum system in real time, which comprises a heating temperature sensor (4-1), a medium temperature sensor (4-2), temperature measuring circuits (4-3, 4-4) and a mixed gas flow quantity measuring circuit, wherein the temperature measuring circuit (4-4) is electrically connected sequentially with a function generator (4-6), a steam flow quantity calculating circuit (4-7) and a dry air flow quantity calculating circuit (4-8); the output terminal of the mixed gas flow quantity measuring circuit (4-5) is electrically connected with the steam flow quantity calculating circuit (4-7) and the dry air flow quantity calculating circuit (4-8) respectively. When the meter of the utility model monitors gas leakage, a vacuum air pump does not need to be stopped, and the utility model can not be affected by the parameters of seasons, environmental temperature, the quantity of circulating cooling water, the temperature of the circulating cooling water, unit loads, the performance of a condenser, etc. The utility model has the advantages of direct viewing, convenience, utility, real time, digitalization, accuracy, etc.
Description
Technical field
The utility model is a kind of tightness of energy watch-keeping turbine vacuum system and the special-purpose gauge of energy on-line measurement turbine vacuum system air leakage.
Background technology
China is so far still in the tightness of using the leak test method to come the qualitative evaluation turbine vacuum system, and the tightness that this method can not the watch-keeping turbine vacuum system can not be measured the air capacity of the turbine vacuum system that bleeds.
For clammy unit, steam turbine carries out vacuum system strictness when test, and quantity of circulating water generally remains unchanged (operation of water circulating pump constant speed), 8 minutes out of service of vacuum pump, with the mean value of back 5 minutes vacuum decline rate as evaluation criterion.(annotate: the tightness standard of the turbine vacuum system of China's " in fixed steam turbine technology condition " regulation is that the vacuum decline rate of the above steam turbine of 300MW is not more than 0.2kPa/min).The vacuum decline rate changes along with the isoparametric variation of performance of season, recirculated cooling water amount, recirculated cooling water temperature, unit load, condenser during leak test, therefore the property estimated poor (comparability is poor).
For Direct Air-cooled Unit, because direct air cooled condenser and weld seam total length that atmosphere directly contacts are far longer than the weld seam total length that clammy unit surface condenser and vapour side and atmosphere all contact, the air capacity of the direct air-cooling turbine vacuum system of bleeding naturally is more than clammy steam turbine, and the volume of direct air-cooling turbine vacuum system is much larger than wet cooling gas turbine, the vacuum decline rate is along with unit load during test, the performance of air cooling tubes condenser, the isoparametric variation of cooling air volume (or rotation speed of fan) and have greatly changed its property estimated poorer (comparability is poorer).Therefore, come the tightness of qualitative evaluation direct air-cooling turbine vacuum system that sizable difficulty is arranged with the leak test method.For example, certain 300MW of power plant Direct Air-cooled Unit is when the stoppage in transit vacuum pump is done leak test to 4 minute at the beginning of 2005 1 month, the exhaust steam pressure of steam turbine rises to 15.5kPa by 14.2kPa, condensing water temperature drops to about 24 ℃ fast by 49 ℃, the degree of supercooling of condensate water is increased to 30.68 ℃ fast by 3.87 ℃, influence the safe operation of unit, had no alternative but to termination test.
In addition, when doing the turbine vacuum system leak test, steam turbine exhaust steam pressure and exhaust temperature can rise at short notice, and this not only influences exerting oneself of unit and heat-economy, and make the low pressure flow passage part and the condenser of steam turbine be subjected to thermal shock, influence its serviceable life.
Summary of the invention
The purpose of this utility model is to overcome above-mentioned existing leak test method when estimating turbine vacuum system, tightness that can not the watch-keeping turbine vacuum system, can not measure the deficiency of turbine vacuum system air capacity of bleeding, and a kind of on-line monitoring turbine vacuum system gas leakage gauge is provided.It drafts monitoring system is also directly measured the turbine vacuum system that bleeds with custom-designed vacuum gas leakage gauge air capacity according to turbine vacuum system gas leakage on-line monitoring method.
The purpose of this utility model reaches by following measure: on-line monitoring turbine vacuum system gas leakage gauge, it comprises heating-up temperature sensor 4-1, medium temperature sensor 4-2, temperature measuring circuit 4-3,4-4, mixed gas flow metering circuit 4-5, described heating-up temperature sensor 4-1 successively with temperature measuring circuit 4-3, mixed gas flow metering circuit 4-5 is electrically connected, described medium temperature sensor 4-2 successively with temperature measuring circuit 4-4, mixed gas flow metering circuit 4-5 is electrically connected, it is characterized in that also and function generator 4-6 successively of described temperature measuring circuit 4-4, steam rates counting circuit 4-7, dry air flow counting circuit 4-8 is electrically connected, the output terminal of described mixed gas flow metering circuit 4-5 also respectively with steam rates counting circuit 4-7, dry air flow counting circuit 4-8 is electrically connected, described steam rates counting circuit 4-7 is a multiplier circuit, and dry air flow counting circuit 4-8 is a subtraction circuit.
In technique scheme, the installation site of described gauge is on the gas exhaust duct 7 of steam turbine pumped vacuum systems separation vessel 3.
The utility model gas leakage gauge is used for the air leakage of on-line monitoring turbine vacuum system, do not need the vacuum pump of stopping transport during monitoring, be not subjected to isoparametric influence of performance of season, environment temperature, recirculated cooling water amount, recirculated cooling water temperature, unit load, condenser, have directly perceived, convenient, practical, in real time, digitizing, advantage such as accurate.
Description of drawings
Fig. 1 the utility model gauge on-line monitoring turbine vacuum system gas leakage synoptic diagram;
The structure principle chart of Fig. 2 the utility model gauge.
Embodiment
Describe performance of the present utility model in detail below in conjunction with accompanying drawing, but they do not constitute to restriction of the present utility model.
In Fig. 1,1 be condenser, 2 for vacuum pump, 3 for separation vessel, 4 for vacuum gas leakage gauge, 5 for start bleed valve, 6 for pump-line, 7 be gas exhaust duct.In Fig. 2,4-1 is that heating-up temperature sensor, 4-2 are that medium temperature sensor, 4-3 are that temperature measuring circuit, 4-4 are that temperature measuring circuit, 4-5 are that mixed gas flow metering circuit, 4-6 are that function generator, 4-7 are that steam rates counting circuit, 4-8 are dry air flow counting circuit.
As can be seen from Figure 1: steam turbine is pumped in the gas vapour potpourri that does not condense in the condenser 1 by vacuum pump 2, the major part of the contained steam of gas vapour potpourri is condensed into water when vacuum pump 2 compressions are boosted, the remaining condensate water that contains the quite high gas vapour potpourri of air capacity and carry (can be described as chilled water, also can be described as annular water seal water) enters separation vessel 3, and the gas vapour potpourri after the separation enters atmosphere after being installed in vacuum gas leakage gauge 4 meterings on the gas outlet 7.To contain quantity of steam quite low for the gas vapour potpourri of row's atmosphere, mainly is the air of vacuum system of bleeding.Like this, the gas vapour mixture flow rate that is entered atmosphere by on-line measurement just can be known the air capacity of the turbine vacuum system that bleeds in real time, and judges the tightness of turbine vacuum system thus.The gas vapour mixture flow rate that enters atmosphere of vacuum gas leakage gauge 4 meterings has been deducted contained steam rates.
During unit starting, because of vacuum system is full of air so air capacity is quite big, for the burden that alleviates vacuum gas leakage gauge 4 need be opened startup bleed valve 5; When unit normally moved, the little needs of the air capacity of vacuum system were closed and are started bleed valve 5, the vacuum gas leakage gauge 4 so that exhaust is all flowed through.
According to system shown in Figure 1 with vacuum gas leakage gauge 4 can the on-line measurement turbine vacuum system air leakage, and according to the tightness of how much judging turbine vacuum system of measuring air leakage.
As can be seen from Figure 2: the utility model vacuum gas leakage gauge can be converted by existing mass-flow gas meter, among the figure the outer part of frame of broken lines for the existing parts of existing mass-flow gas meter as heating-up temperature sensor 4-1, medium temperature sensor 4-2, temperature measuring circuit 4-3,4-4, mixed gas flow metering circuit 4-5 etc.Part in the frame of broken lines is the part that the utility model increases, as: function generator 4-6, steam rates counting circuit 4-7, dry air flow counting circuit 4-8 are electrically connected, function generator 4-6 described in the figure is made by the delivery temperature in the table 1 and density, the corresponding relation formula that contains the vapour ratio and existing function generator, described steam rates counting circuit 4-7 is existing multiplier circuit, and dry air flow counting circuit 4-8 is existing subtraction circuit.
The temperature of table 1 gas vapour potpourri and the corresponding relation that contains steam ratio and mixture density:
| Temperature (℃) | 10 | 15 | 20 | 25 | 30 | 35 | 40 | 45 |
| Contain vapour than (%) | 0.757 | 1.053 | 1.448 | 1.969 | 2.649 | 3.532 | 4.665 | 6.115 |
| Density (kg/m 3) | 1.2412 | 1.2175 | 1.1939 | 1.1702 | 1.1463 | 1.1218 | 1.0966 | 1.0703 |
| Temperature (℃) | 50 | 55 | 60 | 65 | 70 | 75 | 80 | |
| Contain vapour than (%) | 7.960 | 10.304 | 13.266 | 17.015 | 21.761 | 27.798 | 35.521 | |
| Density (kg/m 3) | 1.0426 | 1.0132 | 0.9817 | 0.9476 | 0.9107 | 0.8702 | 0.8258 |
As can be seen from Table 1, the temperature of the gas vapour potpourri of discharging from separation vessel is during less than 40 ℃, and the steam content of gas vapour potpourri is less than 5%.Therefore, with regard to wet cooling gas turbine, the gas vapour mixture temperature that the vacuum pump separation vessel is discharged generally is not more than 40 ℃, the influence of the water vapour of can ignoring.
The precision height (± 1%) that the utility model vacuum gas leakage gauge is measured, good reproducibility (± 0.2%), range ratio big (1: 120), responsive especially to low flow velocity, the minimum lower limit of range can reach 0.5m/s.Instrument can show the instantaneous flow of turbine vacuum system gas leakage and the delivery temperature of cumulative amount and separation vessel, instrument outputting standard signal (4～20mADC), can directly insert the analog input channel of DCS, also can be connected with DCS by communication interface RS232C, make things convenient for the operations staff of master-control room to monitor the gas leakage situation of turbine vacuum system in real time.This gauge is simple in structure, and is easy for installation, and reliable operation has the fault self-checking function.
Need to prove: to those of ordinary skill in the art, can also make some changes or distortion to the utility model under the prerequisite that does not change the utility model principle, this belongs to protection domain of the present utility model equally.
Claims (1)
1, on-line monitoring turbine vacuum system gas leakage gauge, it comprises heating-up temperature sensor (4-1), medium temperature sensing (4-2), temperature measuring circuit (4-3,4-4), mixed gas flow metering circuit (4-5), described heating-up temperature sensor (4-1) successively with temperature measuring circuit (4-3), mixed gas flow metering circuit (4-5) is electrically connected, described medium temperature sensor (4-2) successively with temperature measuring circuit (4-4), mixed gas flow metering circuit (4-5) is electrically connected, it is characterized in that also and function generator (4-6) successively of described temperature measuring circuit (4-4), steam rates counting circuit (4-7), dry air flow counting circuit (4-8) is electrically connected, the output terminal of described mixed gas flow metering circuit (4-5) also respectively with steam rates counting circuit (4-7), dry air flow counting circuit (4-8) is electrically connected, described steam rates counting circuit (4-7) is a multiplier circuit, and dry air flow counting circuit (4-8) is a subtraction circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520095271 CN2784902Y (en) | 2005-02-18 | 2005-02-18 | Meter for on-line monitoring air leakage of steam turbine vacuum system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520095271 CN2784902Y (en) | 2005-02-18 | 2005-02-18 | Meter for on-line monitoring air leakage of steam turbine vacuum system |
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| Publication Number | Publication Date |
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| CN2784902Y true CN2784902Y (en) | 2006-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 200520095271 Expired - Lifetime CN2784902Y (en) | 2005-02-18 | 2005-02-18 | Meter for on-line monitoring air leakage of steam turbine vacuum system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102252808A (en) * | 2011-04-26 | 2011-11-23 | 山东电力研究院 | Online detecting method and device for air leakage quantity of vacuum system of turbo generator unit |
| CN101476966B (en) * | 2009-01-23 | 2011-12-14 | 黄若 | Air leakage measuring apparatus and method for turbocharger |
| CN103487218A (en) * | 2013-09-26 | 2014-01-01 | 国家电网公司 | Condenser vacuum leakproofness detecting system and method |
| CN103499371A (en) * | 2013-09-27 | 2014-01-08 | 西安热工研究院有限公司 | Method for measuring flow of air leaked into condenser and vacuum system |
| CN103712756A (en) * | 2013-12-31 | 2014-04-09 | 苏州宝骅机械技术有限公司 | Quantitative leakage detecting method for pressure system |
| CN106940329A (en) * | 2017-03-01 | 2017-07-11 | 榆林学院 | It is a kind of to measure the experimental provision that the air amount of leaking into condenses influence on steam |
| CN107741303A (en) * | 2017-08-30 | 2018-02-27 | 鞍山海望真空系统有限公司 | Mould vacuum leak detection device and leak detection method |
| CN110441011A (en) * | 2019-07-30 | 2019-11-12 | 辽宁科技大学 | A kind of quick leakage inspection method of gas turbine air cooling system TCA cooler |
| CN111140507A (en) * | 2019-12-05 | 2020-05-12 | 国网河北省电力有限公司电力科学研究院 | Method for measuring air suction amount of water-ring vacuum pump and terminal equipment |
| CN113639935A (en) * | 2021-06-22 | 2021-11-12 | 国家能源(山东)工程技术有限公司 | Vacuum tightness detection system and method for condensing steam turbine unit |
-
2005
- 2005-02-18 CN CN 200520095271 patent/CN2784902Y/en not_active Expired - Lifetime
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101476966B (en) * | 2009-01-23 | 2011-12-14 | 黄若 | Air leakage measuring apparatus and method for turbocharger |
| CN102252808A (en) * | 2011-04-26 | 2011-11-23 | 山东电力研究院 | Online detecting method and device for air leakage quantity of vacuum system of turbo generator unit |
| CN103487218A (en) * | 2013-09-26 | 2014-01-01 | 国家电网公司 | Condenser vacuum leakproofness detecting system and method |
| CN103499371B (en) * | 2013-09-27 | 2016-08-17 | 西安热工研究院有限公司 | A kind of measure condenser and method that vacuum system leaks into air mass flow |
| CN103499371A (en) * | 2013-09-27 | 2014-01-08 | 西安热工研究院有限公司 | Method for measuring flow of air leaked into condenser and vacuum system |
| CN103712756A (en) * | 2013-12-31 | 2014-04-09 | 苏州宝骅机械技术有限公司 | Quantitative leakage detecting method for pressure system |
| CN103712756B (en) * | 2013-12-31 | 2015-12-30 | 苏州宝骅机械技术有限公司 | A kind of quantitative leakage detection method of pressure system |
| CN106940329A (en) * | 2017-03-01 | 2017-07-11 | 榆林学院 | It is a kind of to measure the experimental provision that the air amount of leaking into condenses influence on steam |
| CN107741303A (en) * | 2017-08-30 | 2018-02-27 | 鞍山海望真空系统有限公司 | Mould vacuum leak detection device and leak detection method |
| CN110441011A (en) * | 2019-07-30 | 2019-11-12 | 辽宁科技大学 | A kind of quick leakage inspection method of gas turbine air cooling system TCA cooler |
| CN110441011B (en) * | 2019-07-30 | 2020-11-17 | 辽宁科技大学 | Quick leakage checking method for TCA cooler of gas turbine air cooling system |
| CN111140507A (en) * | 2019-12-05 | 2020-05-12 | 国网河北省电力有限公司电力科学研究院 | Method for measuring air suction amount of water-ring vacuum pump and terminal equipment |
| CN113639935A (en) * | 2021-06-22 | 2021-11-12 | 国家能源(山东)工程技术有限公司 | Vacuum tightness detection system and method for condensing steam turbine unit |
| CN113639935B (en) * | 2021-06-22 | 2023-09-22 | 国家能源(山东)工程技术有限公司 | Vacuum tightness detection system and method for condensing steam turbine unit |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20150218 Granted publication date: 20060531 |