CN103712199A - Anti-cavitation device of injection type boiler water feeding pump and use method thereof - Google Patents
Anti-cavitation device of injection type boiler water feeding pump and use method thereof Download PDFInfo
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Abstract
The invention discloses an anti-cavitation device of an injection type boiler water feeding pump and a use method of the anti-cavitation device. The anti-cavitation device comprises a deaerator, a front pump, the water feeding pump, a high-pressure heater and a coal economizer which are communicated in sequence, wherein the deaerator is provided with a water inlet, a condensate water inlet pipe is connected between the deaerator and the front pump, an electric valve is arranged on a pipeline between the condensate water inlet pipe and the front pump, and the position between the water feeding pump and the high-pressure heater is communicated with the water inlet of the deaerator. According to the anti-cavitation device of the injection type boiler water feeding pump, the anti-cavitation effect of the water feeding pump is good, digital control is achieved, the device is simple, and civil engineering cost is saved.
Description
Technical field
The present invention relates to feed water system of boiler field, particularly relate to a kind of pouring-in boiler feed pump anti cavitation device and using method thereof.
Background technology
The major function of power station water supply system is that the main condensate in deaerator storage tank is improved to pressure by feed pump, after further heating, is transported to the economizer entrance of boiler, as the feedwater of boiler through high-pressure heater.
Because feed pump pumped (conveying) medium is saturation water, feed pump lift is large, cavitation allowance is had relatively high expectations, therefore cavitation easily occurs feed pump.
In prior art, the method that solves boiler feed pump cavitation mainly contains: improve entrance of water-supplying pump pressure (improve oxygen-eliminating device setting height(from bottom), set up pre feedwater pump), reduce entrance of water-supplying pump coolant-temperature gage etc.
Large-scale power station water supply system is to prevent feed pump cavitation by configuration pre feedwater pump and the setting height(from bottom) that improves oxygen-eliminating device mostly at present.It is rear definite that the setting height(from bottom) of oxygen-eliminating device need be carried out transient state calculating to oxygen-eliminating device, because oxygen-eliminating device transient state is calculated the transient state situation that needs the various operating modes of consideration, considers after various allowances, and the installed height mark of oxygen-eliminating device is often high than normal operation desired height.And deaerator device excessive height not only causes many difficulties of installing, simultaneously also uneconomical.
The necessary condition that produces cavitation is that in pump, local pressure reaches or lower than the pressure for vaporization of liquid.Judge that whether the medium in pump vaporizes, and need, in conjunction with the anti-cavitation performance of pump itself, measure the temperature of entrance of water-supplying pump, pressure parameter.If vaporize, by the temperature of timely reduction medium, make medium temperature lower than saturation temperature corresponding to this pressure, can effectively suppress to pump into the vaporization of saliva, thereby reach the object that prevents mercury vapour erosion.
Summary of the invention
Based on this, be necessary to provide a kind of anti-feed pump cavitation effective, can Digital Control, equipment is simple and civil engineering costs is saved pouring-in boiler feed pump anti cavitation device.
A kind of pouring-in boiler feed pump anti cavitation device, comprise oxygen-eliminating device, fore pump, feed pump, high-pressure heater and economizer, described oxygen-eliminating device, fore pump, feed pump, high-pressure heater and economizer are communicated with successively, described oxygen-eliminating device has water inlet, is communicated with condensate water oral siphon between described oxygen-eliminating device and fore pump;
Described condensate water oral siphon is provided with motor-driven valve, and described motor-driven valve is for receiving the motor-driven valve of signal;
Pipeline between described feed pump and described high-pressure heater is also communicated in the water inlet of described oxygen-eliminating device.
In an embodiment, the quantity of described motor-driven valve is two or more therein, and the connection parallel with one another of described motor-driven valve.
In an embodiment, described motor-driven valve is normal closed gate therein.
Therein in an embodiment, described motor-driven valve is for receiving the motor-driven valve of load rejection signal or fore pump inlet pressure low signal, described fore pump inlet pressure low signal is: when the necessary NPSH sum of the saturation pressure that fore pump entrance medium temperature is corresponding and fore pump is greater than fore pump entrance pressure medium, and the signal that fore pump produces.
In an embodiment, the pipeline between described feed pump and the water inlet of described oxygen-eliminating device is provided with minimum flow valve therein.
Therein in an embodiment, between described oxygen-eliminating device and described fore pump, be equipped with control valve between described feed pump and described high-pressure heater.
In an embodiment, between described high-pressure heater and described economizer, be provided with flow controller therein.
Another object of the present invention is to provide a kind of using method of pouring-in boiler feed pump anti cavitation device.
A using method for pouring-in boiler feed pump anti cavitation device, comprises as following steps:
The oxygen-eliminating device of this device, fore pump, feed pump, high-pressure heater and economizer are first communicated with successively, and the water side of feed pump is communicated with described oxygen-eliminating device, by the condensate water oral siphon between described oxygen-eliminating device and fore pump, pumps into condensate water.
Described condensate water oral siphon is controlled by motor-driven valve, and when load rejection signal is unit and electrical network disconnection, control system of power plant provides a signal, and when this signal is true time, motor-driven valve is opened; Or when the necessary NPSH sum of saturation pressure corresponding to preposition pump intake medium temperature and fore pump is greater than fore pump entrance pressure medium, control system of power plant provides a signal, when this signal is true time, motor-driven valve is opened.
Above-mentioned pouring-in boiler feed pump anti cavitation device, by be communicated with condensate water oral siphon between described oxygen-eliminating device and fore pump, after the water that enters fore pump from oxygen-eliminating device flows out mixes with condensate water, the temperature of water is minimized, make the anti-cavitation of feed pump effective, between described condensate water oral siphon and described fore pump, be also provided with motor-driven valve, make the present invention realize Digital Control, easy and simple to handle, save manpower.
Above-mentioned pouring-in boiler feed pump anti cavitation device, the quantity of described motor-driven valve is two or more, and the connection parallel with one another of described motor-driven valve, makes the motor-driven valve can alternation, simultaneously also avoided the fault of motor-driven valve and caused the interruption of technological process, made explained hereafter safe and reliable.
Above-mentioned pouring-in boiler feed pump anti cavitation device, described motor-driven valve is normal closed gate, in closed condition, when needs injected water, just under the control of signal, open, play the effect of switch, in the time of also preventing that unit from normally working, condensate water enters in water supply system.
Above-mentioned pouring-in boiler feed pump anti cavitation device, motor-driven valve is by signal controlling, and the temperature that makes to enter the condensate water of fore pump and feed pump is controlled more accurate, and the anti-cavitation effect of feed pump is better.
Above-mentioned pouring-in boiler feed pump anti cavitation device, the pipeline between described feed pump and the water inlet of described oxygen-eliminating device is provided with minimum flow valve, for meeting the minimum discharge requirement of feed pump.
Above-mentioned pouring-in boiler feed pump anti cavitation device, between described oxygen-eliminating device and described fore pump, be equipped with control valve between described feed pump and described high-pressure heater, plays the effect of switch, is convenient to control into water.
Above-mentioned pouring-in boiler feed pump anti cavitation device, is provided with flow controller between described high-pressure heater and described economizer, is convenient to control the flow that enters water in economizer.
The using method of the pouring-in boiler feed pump anti cavitation device the present invention relates to, technique is simple, easy and simple to handle, cost-saving.
Accompanying drawing explanation
Fig. 1 is embodiment of the present invention schematic diagram.
Description of reference numerals
10, oxygen-eliminating device; 12, oxygen-eliminating device water inlet; 20, motor-driven valve; 30, fore pump; 40, feed pump; 50, high-pressure heater; 60, economizer; 70, control valve; 80, condensate water oral siphon; 90, flow controller; 100, minimum flow valve.
The specific embodiment
Below with reference to embodiment and accompanying drawing, the present invention is described further.
A kind of pouring-in boiler feed pump anti cavitation device, referring to Fig. 1, comprise oxygen-eliminating device 10, fore pump 30, feed pump 40, high-pressure heater 50 and economizer 60, described oxygen-eliminating device 10 has oxygen-eliminating device water inlet 12, described oxygen-eliminating device 10, fore pump 30, feed pump 40, high-pressure heater 50 and economizer 60 are communicated with successively by pipeline, pipeline between described oxygen-eliminating device 10 and fore pump 30 is also communicated with condensate water oral siphon 80, described condensate water oral siphon 80 is provided with motor-driven valve 20, described motor-driven valve 20 quantity are two, and parallel with one another, pipeline between described feed pump 40 and described high-pressure heater 50 is also communicated in described oxygen-eliminating device water inlet 12, between described oxygen-eliminating device 10 and described fore pump 30, between described feed pump 40 and described high-pressure heater 50, be equipped with control valve 70, between described feed pump 40 and oxygen-eliminating device water inlet 12 pipeline on be provided with minimum flow valve 100, between described high-pressure heater 50 and described economizer 60, be provided with flow controller 90, arrival end at fore pump 30 is connected with pressure detecting part, described pressure detecting part is connected in control system of power plant, described motor-driven valve 20 is for can receive the motor-driven valve that comes from control system of power plant signal, the signal of described control system of power plant derives from described control system of power plant, described control system signal is load rejection signal or fore pump inlet pressure low signal, and described fore pump inlet pressure low signal is: the signal that when the necessary NPSH sum of the saturation pressure that fore pump entrance medium temperature is corresponding and fore pump is greater than fore pump entrance pressure medium, control system of power plant produces, due to the pressure of the condensate water pressure higher than the port of export pipeline mesolow feedwater of oxygen-eliminating device, and the temperature of condensate water is lower than the temperature of low pressure feed water.When receiving pump inlet pressure low signal, motor-driven valve 20 is opened, the cooling water pipeline path of condensate water oral siphon 80 now, the condensate water of condensate system is injected to the oral siphon of feed pump 40, low pressure feed water temperature is declined, improve the available NPSH of system, thereby improved feed pump anti-cavitation performance.
The present invention in use, first by control valve 70, minimum flow valve 100 is all opened, open motor-driven valve 20, two motor-driven valves 20 can be opened simultaneously, or only open one, another does standby, by condensate water oral siphon 80, pass into condensate water, successively by fore pump 30, feed pump 40 and high-pressure heater 50, enter again in economizer 60, simultaneously, from feed pump 40 water out, by minimum flow valve 100, pass into oxygen-eliminating device 10, wherein in condensate water oral siphon 80, pumping into of water controlled by motor-driven valve 20, when load rejection signal is unit and electrical network disconnection, control system of power plant provides a signal, when this signal is true time, motor-driven valve 20 is opened, from condensate system, pump into condensate water that temperature is low to fore pump 30, or when the necessary NPSH sum of saturation pressure corresponding to preposition pump intake medium temperature and fore pump is greater than fore pump entrance pressure medium, control system of power plant provides a signal, when this signal is true time, motor-driven valve 20 is opened, and pumps into condensate water that temperature is low to fore pump 30 from condensate system.
The pouring-in boiler feed pump anti cavitation device the present invention relates to, by be communicated with condensate water oral siphon between described oxygen-eliminating device and fore pump, after the water that enters fore pump from oxygen-eliminating device flows out mixes with condensate water, the temperature of water is minimized, make the anti-cavitation of feed pump effective, between described condensate water oral siphon and described fore pump, be also provided with motor-driven valve, make the present invention realize Digital Control, easy and simple to handle, save manpower.
The above embodiment has only expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the scope of the claims of the present invention.It should be pointed out that for the person of ordinary skill of the art, without departing from the inventive concept of the premise, can also make some distortion and improvement, these all belong to protection scope of the present invention.Therefore, the protection domain of patent of the present invention should be as the criterion with claims.
Claims (8)
1. a pouring-in boiler feed pump anti cavitation device, comprise oxygen-eliminating device, fore pump, feed pump, high-pressure heater and economizer, described oxygen-eliminating device, fore pump, feed pump, high-pressure heater and economizer are communicated with successively, described oxygen-eliminating device has water inlet, it is characterized in that, between described oxygen-eliminating device and fore pump, be communicated with condensate water oral siphon;
Described condensate water oral siphon is provided with motor-driven valve, and described motor-driven valve is for receiving the motor-driven valve of signal;
Pipeline between described feed pump and described high-pressure heater is also communicated in the water inlet of described oxygen-eliminating device.
2. pouring-in boiler feed pump anti cavitation device according to claim 1, is characterized in that, the quantity of described motor-driven valve is two or more, and the connection parallel with one another of described motor-driven valve.
3. pouring-in boiler feed pump anti cavitation device according to claim 1 and 2, is characterized in that, described motor-driven valve is normal closed gate.
4. pouring-in boiler feed pump anti cavitation device according to claim 1 and 2, it is characterized in that, described motor-driven valve is for receiving the motor-driven valve of load rejection signal or fore pump inlet pressure low signal, described fore pump inlet pressure low signal is: when the necessary NPSH sum of the saturation pressure that fore pump entrance medium temperature is corresponding and fore pump is greater than fore pump entrance pressure medium, and the signal that control system of power plant produces.
5. pouring-in boiler feed pump anti cavitation device according to claim 1 and 2, is characterized in that, the pipeline between described feed pump and the water inlet of described oxygen-eliminating device is provided with minimum flow valve.
6. pouring-in boiler feed pump anti cavitation device according to claim 1 and 2, is characterized in that, between described oxygen-eliminating device and described fore pump, be equipped with control valve between described feed pump and described high-pressure heater.
7. pouring-in boiler feed pump anti cavitation device according to claim 1 and 2, is characterized in that, between described high-pressure heater and described economizer, is provided with flow controller.
8. a using method for pouring-in boiler feed pump anti cavitation device, is characterized in that, comprises as following steps:
The oxygen-eliminating device of this device, fore pump, feed pump, high-pressure heater and economizer are first communicated with successively, and the water side of feed pump is communicated with described oxygen-eliminating device, by the condensate water oral siphon between described oxygen-eliminating device and fore pump, pumps into condensate water.
Described condensate water oral siphon is controlled by motor-driven valve, and when load rejection signal is unit and electrical network disconnection, control system of power plant provides a signal, and when this signal is true time, motor-driven valve is opened; Or when the necessary NPSH sum of saturation pressure corresponding to preposition pump intake medium temperature and fore pump is greater than fore pump entrance pressure medium, control system of power plant provides a signal, when this signal is true time, motor-driven valve is opened.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806509A (en) * | 2015-05-05 | 2015-07-29 | 上海阿波罗机械股份有限公司 | System for testing cavitation performance of main water feed pump of nuclear power station |
| CN107061370A (en) * | 2017-06-22 | 2017-08-18 | 哈尔滨广瀚新能动力有限公司 | A kind of utilization fore pump solves the device and its application method of ORC electricity generation system pump cavitations |
| CN110500573A (en) * | 2019-09-23 | 2019-11-26 | 云南锡业股份有限公司铜业分公司 | A kind of system and method preventing electrode steam boiler water supply pump cavitation |
| CN110645560A (en) * | 2019-09-03 | 2020-01-03 | 中广核工程有限公司 | Method and system for preventing cavitation of water feeding pump of nuclear power station |
| CN111594460A (en) * | 2020-06-12 | 2020-08-28 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US11965513B2 (en) | 2021-09-14 | 2024-04-23 | Saudi Arabian Oil Company | Protecting centrifugal pumps from cavitation through applied mathematical technique |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104806509A (en) * | 2015-05-05 | 2015-07-29 | 上海阿波罗机械股份有限公司 | System for testing cavitation performance of main water feed pump of nuclear power station |
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| CN110645560A (en) * | 2019-09-03 | 2020-01-03 | 中广核工程有限公司 | Method and system for preventing cavitation of water feeding pump of nuclear power station |
| CN110645560B (en) * | 2019-09-03 | 2021-09-07 | 中广核工程有限公司 | Method and system for preventing cavitation of water feeding pump of nuclear power station |
| CN110500573A (en) * | 2019-09-23 | 2019-11-26 | 云南锡业股份有限公司铜业分公司 | A kind of system and method preventing electrode steam boiler water supply pump cavitation |
| CN111594460A (en) * | 2020-06-12 | 2020-08-28 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
| CN111594460B (en) * | 2020-06-12 | 2022-04-15 | 国网黑龙江省电力有限公司电力科学研究院 | Minimum flow control system of water feeding pump |
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Address after: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant after: Company limited of China Energy Engineering Group Guangdong Electric Power Design Institute Address before: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Applicant before: Guangdong Electric Power Design Institute of CEEC |
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