CN103712199B - Pouring-in boiler feed pump anti cavitation device and using method thereof - Google Patents
Pouring-in boiler feed pump anti cavitation device and using method thereof Download PDFInfo
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- CN103712199B CN103712199B CN201310704065.XA CN201310704065A CN103712199B CN 103712199 B CN103712199 B CN 103712199B CN 201310704065 A CN201310704065 A CN 201310704065A CN 103712199 B CN103712199 B CN 103712199B
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Abstract
The invention discloses a kind of pouring-in boiler feed pump anti cavitation device and using method thereof, described device comprises 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, condensate water oral siphon is also connected with between described oxygen-eliminating device and fore pump, pipeline between described condensate water oral siphon and described fore pump is also provided with motor-driven valve, is also communicated in the water inlet of described oxygen-eliminating device between described feed pump and described high-pressure heater.The pouring-in boiler feed pump anti cavitation device that the present invention relates to, the anti-cavitation of feed pump is effective, can save by the simple and civil engineering costs of Digital Control, equipment.
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 plant feedwater system is that the main condensate in deaerator storage tank is improved pressure by feed pump, after high-pressure heater heats further, is transported to the economizer entrance of boiler, as the feedwater of boiler.
Because feed pump pumped (conveying) medium is saturation water, feed pump lift is large, cavitation margin requirement is higher, therefore feed pump easily cavitation occurs.
In prior art, the method solving boiler feedwater 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.
Current large-scale power station water supply system is prevent feed pump cavitation by the setting height(from bottom) of configuration pre feedwater pump and raising oxygen-eliminating device mostly.Determine after the setting height(from bottom) of oxygen-eliminating device need carry out transient state calculating to oxygen-eliminating device, because oxygen-eliminating device transient state calculates the transient state situation need considering various operating mode, after considering various allowance, often to run desired height high than normal for the installed height mark of oxygen-eliminating device.And deaerator device excessive height, not only cause the many difficulties installed, simultaneously also uneconomical.
Producing the necessary condition of cavitation is that in pump, local pressure reaches or lower than the pressure for vaporization of liquid.Judge whether the medium in pump vaporizes, need in conjunction with the anti-cavitation performance of pump itself, the temperature of entrance of water-supplying pump, pressure parameter are measured.If vaporize, by reducing the temperature of medium in time, making medium temperature lower than saturation temperature corresponding to this pressure, can effectively suppress the vaporization pumping into saliva, thus reach the object preventing pump cavitation.
Summary of the invention
Based on this, be necessary to provide a kind of anti-feed pump cavitation effective, can the pouring-in boiler feed pump anti cavitation device saved of the simple and civil engineering costs of Digital Control, equipment.
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 can the motor-driven valve of Received signal strength;
Pipeline between described feed pump and described high-pressure heater is also communicated in the water inlet of described oxygen-eliminating device.
Wherein in an embodiment, the quantity of described motor-driven valve is two or more, and the connection parallel with one another of described motor-driven valve.
Wherein in an embodiment, described motor-driven valve is normal closed gate.
Wherein in an embodiment, described motor-driven valve is the motor-driven valve that can receive 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, the signal that fore pump produces.
Wherein in an embodiment, the pipeline between the water inlet of described feed pump and described oxygen-eliminating device is provided with minimum flow valve.
Wherein in an embodiment, between described oxygen-eliminating device and described fore pump, between described feed pump and described high-pressure heater, be equipped with control valve.
Wherein in an embodiment, between described high-pressure heater and described economizer, be provided with flow controller.
Another object of the present invention is to the using method that a kind of pouring-in boiler feed pump anti cavitation device is provided.
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, the water side of feed pump is communicated with described oxygen-eliminating device, pumps into condensate water by the condensate water oral siphon between described oxygen-eliminating device and fore pump.
Described condensate water oral siphon is controlled by motor-driven valve, and when load rejection signal is unit and electrical network disconnects, 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, and when this signal is true time, motor-driven valve is opened.
Above-mentioned pouring-in boiler feed pump anti cavitation device, by being communicated with condensate water oral siphon between described oxygen-eliminating device and fore pump, after mixing from the water entering fore pump after oxygen-eliminating device flows out with condensate water, the temperature of water is minimized, make the anti-cavitation of feed pump effective, be also provided with motor-driven valve between described condensate water oral siphon and described fore pump, 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 motor-driven valve can alternation, it also avoid the fault of motor-driven valve simultaneously and cause the interruption of technological process, making explained hereafter safe and reliable.
Above-mentioned pouring-in boiler feed pump anti cavitation device, described motor-driven valve is normal closed gate, is in closed condition, when needs inject water, just open under the control of signal, play the effect of switch, when also can prevent 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 controlled by signal, and the temperature of the condensate water entering fore pump and feed pump is controlled comparatively accurate, the anti-cavitation effect of feed pump is better.
Above-mentioned pouring-in boiler feed pump anti cavitation device, the pipeline between the water inlet of described feed pump and 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, is equipped with control valve between described oxygen-eliminating device and described fore pump, between described feed pump and described high-pressure heater, plays the effect of switch, be 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 the flow controlling to enter water in economizer.
The using method of the pouring-in boiler feed pump anti cavitation device that 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.
Detailed description of the invention
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, see 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 is two, and it is 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, control valve 70 is equipped with between described feed pump 40 and described high-pressure heater 50, between described feed pump 40 and oxygen-eliminating device water inlet 12 pipeline on be provided with minimum flow valve 100, flow controller 90 is provided with between described high-pressure heater 50 and described economizer 60, pressure detecting part is connected with at the arrival end of fore pump 30, described pressure detecting part is connected to control system of power plant, described motor-driven valve 20 is to receive the motor-driven valve coming 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 that the pressure of condensate water feeds water higher than the port of export pipeline mesolow 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 now cooling water pipeline path of condensate water oral siphon 80, the condensate water of condensate system is injected the oral siphon of feed pump 40, low pressure feed water temperature is declined, improve the available NPSH of system, thus improve 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 for subsequent use, condensate water is passed into by condensate water oral siphon 80, successively by fore pump 30, feed pump 40 and high-pressure heater 50, enter in economizer 60 again, simultaneously, pass into oxygen-eliminating device 10 from feed pump 40 water out by minimum flow valve 100, wherein in condensate water oral siphon 80, pumping into of water controls by motor-driven valve 20, load rejection signal is that unit and electrical network are when disconnecting, control system of power plant provides a signal, when this signal is true time, motor-driven valve 20 is opened, the low condensate water of temperature is pumped into fore pump 30 from condensate system, 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 the low condensate water of temperature to fore pump 30 from condensate system.
The pouring-in boiler feed pump anti cavitation device that the present invention relates to, by being communicated with condensate water oral siphon between described oxygen-eliminating device and fore pump, after mixing from the water entering fore pump after oxygen-eliminating device flows out with condensate water, the temperature of water is minimized, make the anti-cavitation of feed pump effective, be also provided with motor-driven valve between described condensate water oral siphon and described fore pump, make the present invention realize Digital Control, easy and simple to handle, save manpower.
The above embodiment only have expressed several embodiment of the present invention, and it describes comparatively concrete and detailed, but therefore can not 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 (7)
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, described motor-driven valve is the motor-driven valve that can receive 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, the signal that control system of power plant produces;
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, the pipeline between the water inlet of described feed pump and described oxygen-eliminating device is provided with minimum flow valve.
5. pouring-in boiler feed pump anti cavitation device according to claim 1 and 2, is characterized in that, be equipped with control valve between described oxygen-eliminating device and described fore pump, between described feed pump and described high-pressure heater.
6. pouring-in boiler feed pump anti cavitation device according to claim 1 and 2, is characterized in that, be provided with flow controller between described high-pressure heater and described economizer.
7. a using method for pouring-in boiler feed pump anti cavitation device, is characterized in that, comprise the following steps:
The oxygen-eliminating device of this device, fore pump, feed pump, high-pressure heater and economizer are first communicated with successively, the water side of feed pump is communicated with described oxygen-eliminating device, pumps into condensate water by the condensate water oral siphon between described oxygen-eliminating device and fore pump;
Described condensate water oral siphon is controlled by motor-driven valve, and when load rejection signal is unit and electrical network disconnects, 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, and when this signal is true time, motor-driven valve is opened.
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Families Citing this family (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 |
| CN107061370B (en) * | 2017-06-22 | 2023-04-18 | 哈尔滨广瀚新能动力有限公司 | Device for solving cavitation problem of ORC power generation system pump by utilizing front-mounted pump and using method thereof |
| 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 |
| 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 |
| US11965513B2 (en) | 2021-09-14 | 2024-04-23 | Saudi Arabian Oil Company | Protecting centrifugal pumps from cavitation through applied mathematical technique |
| CN114893763A (en) * | 2022-04-12 | 2022-08-12 | 中国联合工程有限公司 | Boiler feed pump sealing water structure behind condenser unit changes backpressure unit |
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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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