CN102589824B - Air leakage detection method of condenser - Google Patents
Air leakage detection method of condenser Download PDFInfo
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- CN102589824B CN102589824B CN201210047812.2A CN201210047812A CN102589824B CN 102589824 B CN102589824 B CN 102589824B CN 201210047812 A CN201210047812 A CN 201210047812A CN 102589824 B CN102589824 B CN 102589824B
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- 238000001514 detection method Methods 0.000 title claims abstract description 15
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- 238000012544 monitoring process Methods 0.000 claims abstract description 17
- 239000000498 cooling water Substances 0.000 claims abstract description 11
- 238000000034 method Methods 0.000 abstract description 13
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- 238000007599 discharging Methods 0.000 abstract 1
- 238000012546 transfer Methods 0.000 description 16
- 230000005494 condensation Effects 0.000 description 13
- 238000009833 condensation Methods 0.000 description 13
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Abstract
The invention provides an air leakage detection method of a condenser, comprising the following steps of: firstly, measuring the temperature of a circulating water inlet ti, the temperature to of a water outlet and the temperature to' of a water outlet of circulating heat-exchange pipe of a discharging steam inlet region; and then calculating whether an air leakage quantity of the condenser exceeds a monitoring index A or not according to a formula. According to the air leakage detection method of the condenser, the temperature rising of the circulating cooling water in each region of the condenser is measured so as to realize the detection of the air leakage quantity of the condenser. The method is efficient and reliable, is simple and feasible and has important meaning to guide the efficient and safe operation of the condenser of a heat-engine plant.
Description
Technical field
The invention belongs to detection field, be specifically related to a kind of air leakage detection method of condenser.
Background technology
Condenser is a kind of shell-and-tube heat exchanger that is cooled with circulating water water vapour, and wherein recirculated water is in the inner heat absorption of tube bank, and water vapour is at the outside condensation heat of tube bank.
Incondensable gas has material impact to the condensing heat transfer property of water vapour.Research shows, in water recovery heat transfer process, when incondensable gas content surpasses after 0.2%, its condensation heat transfer coefficient will significantly decline; And when incondensable gas content is lower than 0.2% time, its condensation heat transfer coefficient is substantially unaffected.
Condenser is one of Important Auxiliary equipment of fired power generating unit, China's existing thermal power unit condenser ubiquity low vacuum, the phenomenon that steam turbine exhaust pressure is higher.Research shows, condenser vacuum decline 1%, and unit hear rate will rise 0.6～1%, guarantee that the vacuum of condenser has material impact to the economy of fired power generating unit.In actual motion, the factor that affects condenser vacuum mainly contains blank tolerance and exceeds standard and water side deposition; Because these two factors all can cause condenser heat transfer property, decline, hold poor increase, and adopt existing operational monitoring method to be difficult to tell the impact of these two kinds of factors.
And condenser will be in vacuum state in operational process, extraneous air can be by all means (as the imprecision place of equipment and pipeline, low with exhaust pipeline, low pressure (LP) cylinder shaft seal etc.) enters condenser; The air that enters condenser will affect its heat exchange property as incondensable gas.Because the heat exchange load of condenser is very large, the relative content that enters air in the low-pressure steam of condenser very low (generally ten thousand/following), is not therefore subject to the impact of blank tolerance substantially at its condensation heat transfer of condenser entrance area; Along with constantly condensing of steam, in steam, the content of air constantly rises; After air share surpasses a certain share, it just can exert an influence to the Condensation Heat Transfer Characteristics of condenser.
Summary of the invention
The object of the present invention is to provide a kind ofly can directly judge whether the blank tolerance of condenser exceeds standard, thereby instruct the air leakage detection method of condenser of the efficient operation of condenser.
For achieving the above object, the technical solution used in the present invention is:
1) circulating water intake temperature t
imonitoring: on condenser circulating water intake cross section, arrange one or more circulating water intake temperature sensors, the temperature data that circulating water intake temperature sensor is detected is maybe using the average temperature value detecting as circulating water intake temperature t
i;
2) circulating water outlet temperature t
omonitoring: on condenser circulating water outlet cross section, arrange one or more circulating water outlet temperature sensors, the temperature data that circulating water outlet temperature sensor is detected is maybe using the average temperature value detecting as circulating water outlet temperature t
o;
3) steam discharge entrance area circulating picture-changing heat pipe outlet water temperature t
o' monitoring: near heat exchanger tube exit, steam drain region, arrange one or more steam discharge entrance area circulating picture-changing heat pipes outlet cooling-water temperature sensors condenser is inner, the temperature data that steam discharge entrance area circulating picture-changing heat pipe outlet cooling-water temperature sensor is detected is the outlet water temperature t using the average temperature value detecting as steam discharge entrance area circulating picture-changing heat pipe maybe
o';
4) computing formula of the monitoring index A that whether the blank tolerance of detection condenser exceeds standard is as follows:
In formula: t
i---circulating water intake temperature
T
o---circulating water outlet temperature
T
o'---steam discharge entrance area circulating picture-changing heat pipe outlet water temperature;
When monitoring index A value is greater than 0.9, show the blank tolerance normal of condenser; When A value is between 0.7-0.9, show that the blank tolerance of condenser obviously exceeds standard; When A value is less than 0.7, show the blank tolerance severe overweight of condenser.
0.2 ℃ of the temperature sensor precision < of described temperature point.
Advantage applies of the present invention exists:
1) the present invention, by measuring the recirculated cooling water temperature rise in each region in condenser, has realized the detection of the blank tolerance of condenser, and the method high efficient and reliable, simple and easy to do, to instructing the highly effective and safe operation of thermal power plant's condenser significant.
2) the present invention not only can be used for the condenser of thermal power plant, also can be used for all kinds of condensers of other industry, is with a wide range of applications.
Accompanying drawing explanation
Fig. 1 condenser structural representation, wherein Fig. 1 a is the structural representation of condenser xsect, Fig. 1 b is the structural representation of condenser longitudinal section;
Fig. 2 be certain 600MW unit condenser air relative content along the relative variation of steam condensation flow process, wherein horizontal ordinate represents steam condensation flow process, ordinate represents air relative content;
Fig. 3 be certain 600MW unit condenser coefficient of heat transfer along the variation tendency of steam condensation flow process, wherein horizontal ordinate represents steam condensation flow process, ordinate represents the coefficient of heat transfer;
Fig. 4 be certain 600MW unit condenser heat exchanger tube recirculated water temperature rise along the variation tendency of steam condensation flow process, wherein horizontal ordinate represents steam condensation flow process, ordinate represents the temperature rise of heat exchanger tube recirculated water.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Fig. 2-4th, certain overcritical 600MW unit condenser that numerical simulation obtains is when identical thermal load, and under two blank tolerance of difference, the interior air relative content of steam, the coefficient of heat transfer and the temperature rise of heat exchanger tube recirculated water are at the Changing Pattern of condensation process.As can be seen from the figure, in most of region, the air relative content in steam is all very low, and its coefficient of heat transfer and recirculated water temperature rise all keep constant; After a certain critical point, air relative content sharply raises, and the coefficient of heat transfer and recirculated water temperature rise sharply decline.The position that this critical point occurs is relevant with blank tolerance, and blank tolerance is larger, and this point occurs more early.
According to above-mentioned rule, take this critical point as boundary, the heat exchange region in condenser is divided into the rapid air zone declining of main condensing zone and heat exchange region that the coefficient of heat transfer is higher, its heat transfer process is mainly to complete in main condensing zone.Research Fig. 4 can find, blank tolerance is larger, and the cooling water temperature rise in main condensing zone is just larger, and this is to cause the expanded range of air zone, main condensing zone to dwindle because blank tolerance increases, under total heat exchange amount and the certain prerequisite of circulating cooling water flow, the heat transfer intensity of main condensing zone increases.Therefore, in main condensing zone, the ratio A of recirculated water temperature rise and recirculated water average temperature rising can reflect that the interior main condensing zone of condenser accounts for the share of whole heat transfer zone, by measuring circulating water intake medial temperature, outlet medial temperature and the average outlet temperature of main condensing zone and calculating A value, can judge in condenser, whether blank tolerance exceeds standard.Under condenser steam condensation thermal discharge and the certain prerequisite of circulating cooling water flow, if blank tolerance is smaller, air zone is also less with respect to whole heat exchange region; Condenser overwhelming majority heat-exchanging tube bundle is all in main condensing zone, and A value approaches 1; And when the blank tolerance of condenser increases, will cause air zone to expand, and main condensing zone reduces, and A value declines.By diminishing of A value, just can directly judge whether the air capacity in condenser exceeds standard.
In the actual motion of condenser, the size of main condensing zone cannot be determined, but consider that the recirculated water temperature rise in each pipe is basic identical in main condensing zone, therefore can be by measuring near condenser entrance the recirculated water temperature rise in heat exchanger tube as the recirculated water temperature rise of main condensing zone; Considering that actual condenser is in service there are various deviations, so the measurement of circulating water temperature all needs to arrange that a plurality of measuring points are to improve its reliability; Because the recirculated water temperature rise of general condenser is 8 ℃ of left and right, in order to improve the computational accuracy of A value, temperature sensor used should have higher measuring accuracy.
Based on above principle, detection method of the present invention is as follows:
Referring to Fig. 1,1) circulating water intake temperature t
imonitoring: on condenser circulating water intake cross section 1, arrange one or more circulating water intake temperature sensors, the temperature data that circulating water intake temperature sensor is detected is maybe using the average temperature value detecting as circulating water intake temperature t
i;
2) circulating water outlet temperature t
omonitoring: on condenser circulating water outlet cross section 2, arrange one or more circulating water outlet temperature sensors, the temperature data that circulating water outlet temperature sensor is detected is maybe using the average temperature value detecting as circulating water outlet temperature t
o;
3) steam discharge entrance area circulating picture-changing heat pipe outlet water temperature t
o' monitoring: near steam drain region heat exchanger tube, export 3 places and arrange one or more steam discharge entrance area circulating picture-changing heat pipes outlet cooling-water temperature sensors condenser is inner, the temperature data that steam discharge entrance area circulating picture-changing heat pipe outlet cooling-water temperature sensor is detected is the outlet water temperature t using the average temperature value detecting as steam discharge entrance area circulating picture-changing heat pipe maybe
o';
4) computing formula of the monitoring index A that whether the blank tolerance of detection condenser exceeds standard is as follows:
In formula: t
i---circulating water intake temperature
T
o---circulating water outlet temperature
T
o'---steam discharge entrance area circulating picture-changing heat pipe outlet water temperature;
When monitoring index A value is greater than 0.9, show the blank tolerance normal of condenser; When A value is between 0.7-0.9, show that the blank tolerance of condenser obviously exceeds standard; When A value is less than 0.7, show the blank tolerance severe overweight of condenser.
0.2 ℃ of the temperature sensor precision < of described temperature point.
Claims (2)
1. an air leakage detection method of condenser, is characterized in that comprising the following steps:
1) circulating water intake temperature t
imonitoring: above in condenser circulating water intake cross section (1) arrange one or more circulating water intake temperature sensors, the temperature data that circulating water intake temperature sensor is detected is maybe using the average temperature value detecting as circulating water intake temperature t
i;
2) circulating water outlet temperature t
omonitoring: above in condenser circulating water outlet cross section (2) arrange one or more circulating water outlet temperature sensors, the temperature data that circulating water outlet temperature sensor is detected is maybe using the average temperature value detecting as circulating water outlet temperature t
o;
3) steam discharge entrance area circulating picture-changing heat pipe outlet water temperature t
o' monitoring: near steam drain region circulating picture-changing heat pipe outlet (3), locate to arrange one or more steam discharge entrance area circulating picture-changing heat pipes outlet cooling-water temperature sensors condenser is inner, the temperature data that steam discharge entrance area circulating picture-changing heat pipe outlet cooling-water temperature sensor is detected is the outlet water temperature t using the average temperature value detecting as steam discharge entrance area circulating picture-changing heat pipe maybe
o';
4) computing formula of the monitoring index A that whether the blank tolerance of detection condenser exceeds standard is as follows:
In formula: t
i---circulating water intake temperature
T
o---circulating water outlet temperature
T
o'---steam discharge entrance area circulating picture-changing heat pipe outlet water temperature;
When monitoring index A value is greater than 0.9, show the blank tolerance normal of condenser; When A value is between 0.7-0.9, show that the blank tolerance of condenser obviously exceeds standard; When A value is less than 0.7, show the blank tolerance severe overweight of condenser.
2. air leakage detection method of condenser according to claim 1, is characterized in that: the temperature sensor precision <0.2 ℃ of temperature point.
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| CN201210047812.2A CN102589824B (en) | 2012-02-28 | 2012-02-28 | Air leakage detection method of condenser |
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| WO2015100632A1 (en) * | 2013-12-31 | 2015-07-09 | 西门子公司 | Method for diagnosing operational parameter detection fault in gas turbine |
| CN104132790B (en) * | 2014-07-01 | 2017-04-05 | 重庆建设机电有限责任公司 | A kind of motorcycle engine water-cooling system tightness detector and detection method |
| CN105303037B (en) * | 2015-10-10 | 2017-12-29 | 山东电力研究院 | A kind of computational methods for the critical hollow tolerance for causing condenser vacuum to deteriorate |
| 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 |
| CN109632205A (en) * | 2018-12-05 | 2019-04-16 | 北京英贝思科技有限公司 | The on-line calculation method of Tightness Property of Condenser Vacuum System |
Citations (2)
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|---|---|---|---|---|
| CN101033918A (en) * | 2007-04-06 | 2007-09-12 | 西安热工研究院有限公司 | Method for monitoring change of relative air content in condensing thermal power unit condenser |
| 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 |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101033918A (en) * | 2007-04-06 | 2007-09-12 | 西安热工研究院有限公司 | Method for monitoring change of relative air content in condensing thermal power unit condenser |
| 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 |
Non-Patent Citations (2)
| Title |
|---|
| 漏空气对凝汽器传热性能影响的实验研究;种道彤等;《中国电机工程学报》;20050417(第04期);第152-157页 * |
| 种道彤等.漏空气对凝汽器传热性能影响的实验研究.《中国电机工程学报》.2005,(第04期), |
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