CN203671582U - Injection type boiler feed pump anti-cavitation device - Google Patents
Injection type boiler feed pump anti-cavitation device Download PDFInfo
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- CN203671582U CN203671582U CN201320848346.8U CN201320848346U CN203671582U CN 203671582 U CN203671582 U CN 203671582U CN 201320848346 U CN201320848346 U CN 201320848346U CN 203671582 U CN203671582 U CN 203671582U
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- feed pump
- pump
- driven valve
- motor
- oxygen
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Abstract
The utility model discloses an injection type boiler feed pump anti-cavitation device which comprises a deaerator, a front-mounted pump, a feed pump, a high-pressure heater and an economizer. The deaerator, the front-mounted pump, the feed pump, the high-pressure heater and the economizer are sequentially communicated, the deaerator is provided with a water inlet, a condensation water inlet pipe is further connected between the deaerator and the front-mounted pump, an electrically-operated valve is further arranged on a pipe between the condensation water inlet pipe and the front-mounted pump, and the water inlet of the deaerator is further communicated with the position between the feed pump and the high-pressure heater. By means of the injection type boiler feed pump anti-cavitation device, the anti-cavitation effect of the feed pump is good, digital control can be achieved, the device is simple, and the civil engineering cost is saved.
Description
Technical field
The utility model relates to feed water system of boiler field, particularly relates to a kind of pouring-in boiler feed pump anti cavitation device.
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 the setting height(from bottom) of configuration pre feedwater pump and raising 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.
Produce the necessary condition of cavitation and be that local pressure in pump reaches or lower than the pressure for vaporization of liquid.Judge whether the medium in pump vaporizes, need be in conjunction with the anti-cavitation performance of pump itself, temperature, pressure parameter to entrance of water-supplying pump are measured.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.
Utility model content
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 the motor-driven valve that can receive 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 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, 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.
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 utility model realize Digital Control, easy and simple to handle, save manpower, and the using method of the pouring-in boiler feed pump anti cavitation device that the utility model relates to, technique is simple, easy and simple to handle, cost-saving.
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 avoid 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, in the time of needs injected water, just under the control of signal, open, play the effect of switch, also can prevent that unit from normally working time, condensate water enters in water supply system.
Above-mentioned pouring-in boiler feed pump anti cavitation device, motor-driven valve, by signal controlling, makes the temperature control of the condensate water that enters fore pump and feed pump 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.
Accompanying drawing explanation
Fig. 1 is the utility model embodiment 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 utility model 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, because the pressure of condensate water is higher than the pressure of 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.In the time 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 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 utility model 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, pass into condensate water by condensate water oral siphon 80, successively by fore pump 30, feed pump 40 and high-pressure heater 50, enter again in economizer 60, simultaneously, pass into oxygen-eliminating device 10 by minimum flow valve 100 from feed pump 40 water out, 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 in the time that 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 that the utility model 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 utility model realize Digital Control, easy and simple to handle, save manpower.
The above embodiment has only expressed several embodiment of the present utility model, and it describes comparatively concrete and detailed, but can not therefore be interpreted as the restriction to the utility model the scope of the claims.It should be pointed out that for the person of ordinary skill of the art, without departing from the concept of the premise utility, can also make some distortion and improvement, these all belong to protection domain of the present utility model.Therefore, the protection domain of the utility model patent 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, and described motor-driven valve is the motor-driven valve that can receive 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 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, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848346.8U CN203671582U (en) | 2013-12-19 | 2013-12-19 | Injection type boiler feed pump anti-cavitation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320848346.8U CN203671582U (en) | 2013-12-19 | 2013-12-19 | Injection type boiler feed pump anti-cavitation device |
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| Publication Number | Publication Date |
|---|---|
| CN203671582U true CN203671582U (en) | 2014-06-25 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320848346.8U Withdrawn - After Issue CN203671582U (en) | 2013-12-19 | 2013-12-19 | Injection type boiler feed pump anti-cavitation device |
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| CN (1) | CN203671582U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712199A (en) * | 2013-12-19 | 2014-04-09 | 中国能源建设集团广东省电力设计研究院 | Anti-cavitation device of injection type boiler water feeding pump and use method thereof |
-
2013
- 2013-12-19 CN CN201320848346.8U patent/CN203671582U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103712199A (en) * | 2013-12-19 | 2014-04-09 | 中国能源建设集团广东省电力设计研究院 | Anti-cavitation device of injection type boiler water feeding pump and use method thereof |
| CN103712199B (en) * | 2013-12-19 | 2015-08-12 | 中国能源建设集团广东省电力设计研究院有限公司 | Pouring-in boiler feed pump anti cavitation device and using method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC Free format text: FORMER NAME: CHINA ENERGY ENGINEERING GROUP GUANGDONG ELECTRIC POWER DESIGN INSTITUTE |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 Luogang District, Guangdong, Guangzhou Science City Fung Road, No. 1, No. Patentee 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. Patentee before: Guangdong Electric Power Design Institute of CEEC |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20140625 Effective date of abandoning: 20150812 |
|
| RGAV | Abandon patent right to avoid regrant |