CN104791261A - Feed pump cavitation prevention device and method - Google Patents
Feed pump cavitation prevention device and method Download PDFInfo
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- CN104791261A CN104791261A CN201510217721.2A CN201510217721A CN104791261A CN 104791261 A CN104791261 A CN 104791261A CN 201510217721 A CN201510217721 A CN 201510217721A CN 104791261 A CN104791261 A CN 104791261A
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- oxygen
- controller
- eliminating device
- vapour pressure
- vapour
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
- F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention provides a feed pump cavitation prevention device and method. The feed pump cavitation prevention device comprises a vapor pressure detector, a controller and an oxygen remover pressure adjusting valve which are sequentially connected. The vapor pressure detector is connected with an oxygen remover, detects the inner vapor pressure value of the oxygen remover and sends the inner vapor pressure value to the controller. The controller calculates the vapor pressure drop rate in the oxygen remover according to the inner vapor pressure value and judges whether the vapor pressure drop rate exceeds a first preset value or not; if the vapor pressure drop rate exceeds the first preset value, a high level signal is sent to the oxygen remover pressure adjusting valve; the oxygen remover pressure adjusting valve adjusts the inner vapor pressure of the oxygen remover according to the high level signal till the controller detects the vapor pressure drop rate in the oxygen remover does not exceed a second preset value through the vapor pressure detector, and the situation is maintained for preset time. The feed pump cavitation prevention device can effectively prevent cavitation of a feed pump under the unit load shedding working condition and in the sudden drop process of the vapor pressure in the oxygen remover.
Description
Technical field
The present invention relates to technical field of electric power, particularly relate to a kind of feed water pump anti cavitation device, feed water pump vapour proof etching method.
Background technique
Feed water pump is the important power equipment of nuclear power plant's secondary circuit, and the cavitation of feed water pump can cause pump to shake, and destroys metallic material, flow, lift is declined, can cause Feed Pump Trip time serious, causes nuclear island to be jumped piling, relevant device cannot normally be run.
The main cause of feed water pump cavitation is caused to be the too low or hypotony of the liquid level of oxygen-eliminating device owing to being connected with feed water pump, prior art is usually according to oxygen-eliminating device inner steam pressure, control deaerator pressure control valve according to PID (ratio, integration or differential), this is effective when power plant load is stablized; But in load rejection operating mode, oxygen-eliminating device pressure drop, regulates tracking velocity to have in limited time automatically, cannot in time by deaerator pressure control valve standard-sized sheet, increase main vapour air demand and pressurize is carried out to oxygen-eliminating device, have the risk of the feed water pump cavitation caused because oxygen-eliminating device inner steam pressure is low like this.
Summary of the invention
Based on this, be necessary in load rejection operating mode, oxygen-eliminating device pressure drop, automatically regulate tracking velocity to have in limited time, there is the technical problem of the risk of the feed water pump cavitation caused because oxygen-eliminating device inner steam pressure is low in prior art, provides a kind of feed water pump anti cavitation device, feed water pump vapour proof etching method.
A kind of feed water pump anti cavitation device, comprising: the vapour pressure detector, controller, the deaerator pressure control valve that connect successively; Described vapour pressure detector connects oxygen-eliminating device;
Described vapour pressure detector detects the inner steam pressure value of oxygen-eliminating device, and described inner steam pressure value is sent to controller;
Described controller calculates the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judges that whether described vapour pressure rate of descent is more than the first predefined value; If exceed, send high level signal to deaerator pressure control valve;
Deaerator pressure control valve regulates the inner steam pressure of oxygen-eliminating device according to described high level signal, until by vapour pressure detector, controller detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintains Preset Time.
Above-mentioned feed water pump anti cavitation device utilizes controller to detect the vapour pressure rate of descent of oxygen-eliminating device inside by vapour pressure detector, when above-mentioned vapour pressure rate of descent exceedes predefined value, send high level signal to deaerator pressure control valve, deaerator pressure control valve carries out pressurize by regulating the vapour pressure of oxygen-eliminating device inside to oxygen-eliminating device, can in load rejection operating mode, during the vapour pressure rapid drawdown of oxygen-eliminating device inside, the effectively cavitation of prevention feed water pump.
A kind of feed water pump vapour proof etching method, comprises the steps:
Detected the inner steam pressure value of oxygen-eliminating device by vapour pressure detector, described inner steam pressure value is sent to controller;
Utilize controller to calculate the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judge that whether described vapour pressure rate of descent is more than the first predefined value;
If, high level is sent to deaerator pressure control valve by controller, and utilize deaerator pressure control valve to regulate the inner steam pressure of oxygen-eliminating device, until by vapour pressure detector, controller detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintain Preset Time.
Above-mentioned feed water pump vapour proof etching method, the inner steam pressure value of oxygen-eliminating device is detected by vapour pressure detector, described inner steam pressure value is sent to controller, controller is utilized to calculate the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, when vapour pressure rate of descent is more than the first predefined value, high level is sent to deaerator pressure control valve by controller, and utilize deaerator pressure control valve to regulate the inner steam pressure of oxygen-eliminating device, until by vapour pressure detector, controller detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintain Preset Time, to carry out pressurize to oxygen-eliminating device, can in load rejection operating mode, during the vapour pressure rapid drawdown of oxygen-eliminating device inside, the cavitation of effective prevention feed water pump.
Accompanying drawing explanation
Fig. 1 is the feed water pump anti cavitation device structural representation of an embodiment;
Fig. 2 is the feed water pump anti cavitation device structural representation of a preferred embodiment;
Fig. 3 is the feed water pump vapour proof etching method flow chart of an embodiment.
Embodiment
Be described in detail below in conjunction with the embodiment of accompanying drawing to feed water pump anti cavitation device of the present invention, feed water pump vapour proof etching method.
With reference to figure 1, Figure 1 shows that the feed water pump anti cavitation device structural representation of an embodiment, comprising: the vapour pressure detector 10 connected successively, controller 30, deaerator pressure control valve 50; Described vapour pressure detector 10 connects oxygen-eliminating device; Wherein, above-mentioned oxygen-eliminating device can from its inner extraction pressure inlet tube, make pressure inlet tube vapour pressure value consistent with the vapour pressure value of oxygen-eliminating device inside, vapour pressure detector 10 connects oxygen-eliminating device by above-mentioned pressure inlet tube, and such vapour pressure detector 10 is the inner steam pressure value of oxygen-eliminating device in the vapour pressure value that above-mentioned pressure inlet tube detects;
Described vapour pressure detector 10 detects the inner steam pressure value of oxygen-eliminating device, and described inner steam pressure value is sent to controller 30;
Described controller 30 calculates the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judges that whether described vapour pressure rate of descent is more than the first predefined value; If described vapour pressure rate of descent is more than the first predefined value, controller 30 sends high level signal to deaerator pressure control valve 50; Wherein, what controller 30 can be correlated with to inner steam pressure value differentiates, to calculate the vapour pressure rate of descent of oxygen-eliminating device inside;
Deaerator pressure control valve 50 regulates the inner steam pressure of oxygen-eliminating device according to described high level signal, until by vapour pressure detector 10, controller 30 detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintains Preset Time.
Above-mentioned deaerator pressure control valve 50 can regulate the inner steam pressure of oxygen-eliminating device, and under nominal situation, deaerator pressure control valve 50 aperture, can make the vapour pressure of oxygen-eliminating device inside keep within the specific limits; In removal of load operating mode, can standard-sized sheet deaerator pressure control valve fast, increase oxygen-eliminating device steam supplying amount, prevent the rapid drawdown of oxygen-eliminating device inner steam pressure, and then the cavitation of prevention feed water pump.
In the present embodiment, the inner steam pressure of oxygen-eliminating device is change, when the vapour pressure of oxygen-eliminating device inside is too low or vapour pressure rate of descent is excessive cause its vapour pressure low time, the cavitation of feed water pump can be caused, affect it and normally run.Under normal circumstances, when the vapour pressure rate of descent of oxygen-eliminating device inside is more than the first predefined value, feed water pump runs under being in load rejection operating mode, now needs to regulate the vapour pressure of oxygen-eliminating device inside, to reduce the vapour pressure rate of descent of its inside; Vapour pressure rate of descent when oxygen-eliminating device inside is no more than the second predefined value, and the vapour pressure rate of descent of this oxygen-eliminating device inside is no more than after the second predefined value reaches Preset Time, load rejection operating mode terminates, feed water pump recovers to run in normal conditions, now, oxygen-eliminating device can work on existing vapour pressure state; Wherein the first predefined value, the second predefined value or Preset Time can be determined according to the state of the specific works environment of feed water pump and equipment.
The feed water pump anti cavitation device that the present embodiment provides utilizes controller 30 to detect the vapour pressure rate of descent of oxygen-eliminating device inside by vapour pressure detector 10, when above-mentioned vapour pressure rate of descent exceedes predefined value, send high level signal to deaerator pressure control valve 50, deaerator pressure control valve 50 carries out pressurize by regulating the vapour pressure of oxygen-eliminating device inside to oxygen-eliminating device, can in load rejection operating mode, during the vapour pressure rapid drawdown of oxygen-eliminating device inside, the effectively cavitation of prevention feed water pump.
With reference to figure 2, Figure 2 shows that the feed water pump anti cavitation device structural representation of a preferred embodiment, as diagram, above-mentioned feed water pump anti cavitation device can also comprise rest-set flip-flop 40, diverter circuit 60; The output terminal of the input end connection control device 30 of described rest-set flip-flop 40, the output terminal of rest-set flip-flop 40 connects the input end of diverter circuit 60, and the output terminal of described diverter circuit 60 connects deaerator pressure control valve 50; Controller 30 calculates the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judges that whether described vapour pressure rate of descent is more than the first predefined value; If described vapour pressure rate of descent is more than the first predefined value, controller 30 sends high level signal and holds to the S of rest-set flip-flop 40, rest-set flip-flop 40 exports high level signal to diverter circuit 60, described diverter circuit 60 generates switching signal according to above-mentioned high level signal, and described switching signal is sent to deaerator pressure control valve 50; Deaerator pressure control valve 50 receives above-mentioned switching signal, and predetermined value 100% (the regulating command maximum value of deaerator pressure control valve) can be selected according to switching signal, now, deaerator pressure control valve just can standard-sized sheet fast, significantly regulates the vapour pressure of oxygen-eliminating device inside.
In the present embodiment, rest-set flip-flop 40 is installed between controller 30 and deaerator pressure control valve 50, when controller 30 detects above-mentioned vapour pressure rate of descent more than the first predefined value, transmission high level signal is held to the S of rest-set flip-flop 40, rest-set flip-flop 40 exports high level signal to diverter circuit 60, described diverter circuit 60 generates switching signal according to above-mentioned high level signal, and described switching signal is sent to deaerator pressure control valve, deaerator pressure control valve 50 carries out pressurize by significantly regulating the vapour pressure of oxygen-eliminating device inside to oxygen-eliminating device; When vapour pressure rate of descent is not more than the first predefined value, controller 30 sends high level signal and holds to the R of rest-set flip-flop 40, rest-set flip-flop 40 output low level signal is sent to deaerator pressure control valve 50 by diverter circuit 60, now, its inner steam pressure is kept within the specific limits by modes such as fine settings by deaerator pressure control valve 50.
In one embodiment, above-mentioned controller can be DCS controller.DCS (Distributed ControlSystem, distributed control system) controller has higher operational capability and stability, and the present embodiment middle controller adopts DCS controller can improve the stability of feed water pump anti cavitation device.
In one embodiment, above-mentioned first predefined value can be 0.1MPa/min (MPa is per minute).Generally, when the vapour pressure rate of descent of oxygen-eliminating device inside is more than 0.1MPa/min, unit enters removal of load operating mode, now need to regulate the vapour pressure of oxygen-eliminating device inside, to reduce the vapour pressure rate of descent of its inside, ensure the pressure of entrance of water-supplying pump, prevent its cavitation.
In one embodiment, above-mentioned second predefined value can be 0.05MPa/min.Generally, when the vapour pressure rate of descent of oxygen-eliminating device inside is no more than 0.05MPa/min, the inlet pressure of feed water pump can revert to nominal situation gradually from removal of load operating mode, and pressure regulator valve can return to normal mode.
In one embodiment, above-mentioned Preset Time can be 10 seconds.Generally, when the vapour pressure rate of descent of oxygen-eliminating device inside is no more than 0.05MPa/min, and the state that above-mentioned vapour pressure rate of descent is no more than 0.05MPa/min reaches 10 seconds, can think that the working state of feed water pump reverts to nominal situation.
With reference to figure 3, Figure 3 shows that the feed water pump vapour proof etching method flow chart of an embodiment, comprise the steps:
S10, is detected the inner steam pressure value of oxygen-eliminating device, described inner steam pressure value is sent to controller by vapour pressure detector;
S20, utilizes controller to calculate the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judges that whether described vapour pressure rate of descent is more than the first predefined value;
S30, if so, send high level to deaerator pressure control valve by controller, and utilize deaerator pressure control valve to regulate the inner steam pressure of oxygen-eliminating device, until by vapour pressure detector, controller detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintain Preset Time.
In the present embodiment, the inner steam pressure of oxygen-eliminating device is change, when the vapour pressure of oxygen-eliminating device inside is too low or vapour pressure rate of descent is excessive cause its vapour pressure low time, the cavitation of feed water pump can be caused, affect it and normally run.Under normal circumstances, when the vapour pressure rate of descent of oxygen-eliminating device inside is more than the first predefined value, feed water pump runs under being in load rejection operating mode, now needs to regulate the vapour pressure of oxygen-eliminating device inside, to reduce the vapour pressure rate of descent of its inside; Vapour pressure rate of descent when oxygen-eliminating device inside is no more than the second predefined value, and the vapour pressure rate of descent of this oxygen-eliminating device inside is no more than after the second predefined value reaches Preset Time, load rejection operating mode terminates, feed water pump recovers to run in normal conditions, now, oxygen-eliminating device can work on existing vapour pressure state; Wherein the first predefined value, the second predefined value or Preset Time can be determined according to the state of the specific works environment of feed water pump and equipment.
The feed water pump vapour proof etching method that the present embodiment provides, the inner steam pressure value of oxygen-eliminating device is detected by vapour pressure detector, described inner steam pressure value is sent to controller, controller is utilized to calculate the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, when vapour pressure rate of descent is more than the first predefined value, high level is sent to deaerator pressure control valve by controller, and utilize deaerator pressure control valve to regulate the inner steam pressure of oxygen-eliminating device, until by vapour pressure detector, controller detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintain Preset Time, to carry out pressurize to oxygen-eliminating device, can in load rejection operating mode, during the vapour pressure rapid drawdown of oxygen-eliminating device inside, the cavitation of effective prevention feed water pump.
In one embodiment, above-mentioned first predefined value can be 0.1MPa/min.Generally, when the vapour pressure rate of descent of oxygen-eliminating device inside is more than 0.1MPa/min, unit enters removal of load operating mode, now need significantly to regulate the vapour pressure of oxygen-eliminating device inside, to reduce the vapour pressure rate of descent of its inside, ensure the pressure of entrance of water-supplying pump, prevent its cavitation.
In one embodiment, above-mentioned second predefined value can be 0.05MPa/min.Generally, when the vapour pressure rate of descent of oxygen-eliminating device inside is no more than 0.05MPa/min, the inlet pressure of feed water pump can revert to nominal situation gradually from removal of load operating mode, deaerator pressure control valve can return to normal mode, the vapour pressure value of oxygen-eliminating device inside can be kept within the specific limits by modes such as fine settings.
In one embodiment, above-mentioned Preset Time can be 10 seconds.Generally, when the vapour pressure rate of descent of oxygen-eliminating device inside is no more than 0.05MPa/min, and the state that above-mentioned vapour pressure rate of descent is no more than 0.05MPa/min reaches 10 seconds, can think that the working state of feed water pump reverts to nominal situation.
Each technical characteristics of the above embodiment can combine arbitrarily, for making description succinct, the all possible combination of each technical characteristics in above-described embodiment is not all described, but, as long as the combination of these technical characteristicss does not exist contradiction, be all considered to be the scope that this specification is recorded.
The above embodiment only have expressed several mode of execution of the present invention, and it describes comparatively concrete and detailed, but can not therefore be construed as limiting the scope of the patent.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 (10)
1. a feed water pump anti cavitation device, is characterized in that, comprising: the vapour pressure detector, controller, the deaerator pressure control valve that connect successively; Described vapour pressure detector connects oxygen-eliminating device;
Described vapour pressure detector detects the inner steam pressure value of oxygen-eliminating device, and described inner steam pressure value is sent to controller;
Described controller calculates the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judges that whether described vapour pressure rate of descent is more than the first predefined value; If exceed, send high level signal to deaerator pressure control valve;
Deaerator pressure control valve regulates the inner steam pressure of oxygen-eliminating device according to described high level signal, until by vapour pressure detector, controller detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintains Preset Time.
2. feed water pump anti cavitation device according to claim 1, is characterized in that, also comprises rest-set flip-flop, diverter circuit; The output terminal of the input end connection control device of described rest-set flip-flop, the output terminal of rest-set flip-flop connects the input end of diverter circuit, and the output terminal of described diverter circuit connects deaerator pressure control valve; Controller calculates the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judges that whether described vapour pressure rate of descent is more than the first predefined value; If exceed, transmission high level signal is held to the S of rest-set flip-flop, and rest-set flip-flop exports high level signal to diverter circuit, and described diverter circuit generates switching signal according to above-mentioned high level signal, and described switching signal is sent to deaerator pressure control valve.
3. feed water pump anti cavitation device according to claim 1, is characterized in that, described controller is DCS controller.
4. feed water pump anti cavitation device according to claim 1, is characterized in that, described first predefined value is 0.1MPa/min.
5. feed water pump anti cavitation device according to claim 1, is characterized in that, described second predefined value is 0.05MPa/min.
6. feed water pump anti cavitation device according to claim 1, is characterized in that, described Preset Time is 10 seconds.
7. a feed water pump vapour proof etching method, is characterized in that, comprises the steps:
Detected the inner steam pressure value of oxygen-eliminating device by vapour pressure detector, described inner steam pressure value is sent to controller;
Utilize controller to calculate the vapour pressure rate of descent of oxygen-eliminating device inside according to inner steam pressure value, and judge that whether described vapour pressure rate of descent is more than the first predefined value;
If, high level is sent to deaerator pressure control valve by controller, and utilize deaerator pressure control valve to regulate the inner steam pressure of oxygen-eliminating device, until by vapour pressure detector, controller detects that the vapour pressure rate of descent of oxygen-eliminating device inside is no more than the second predefined value, and maintain Preset Time.
8. feed water pump vapour proof etching method according to claim 7, is characterized in that, described first predefined value is 0.1MPa/min.
9. feed water pump vapour proof etching method according to claim 7, is characterized in that, described second predefined value is 0.05MPa/min.
10. feed water pump vapour proof etching method according to claim 7, is characterized in that, described Preset Time is 10 seconds.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217721.2A CN104791261A (en) | 2015-04-30 | 2015-04-30 | Feed pump cavitation prevention device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510217721.2A CN104791261A (en) | 2015-04-30 | 2015-04-30 | Feed pump cavitation prevention device and method |
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| CN104791261A true CN104791261A (en) | 2015-07-22 |
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| CN201510217721.2A Pending CN104791261A (en) | 2015-04-30 | 2015-04-30 | Feed pump cavitation prevention device and method |
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Citations (3)
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| JPH08327010A (en) * | 1995-06-02 | 1996-12-10 | Toshiba Corp | Water hammer preventing apparatus for water supply system |
| JP2002168404A (en) * | 2000-11-30 | 2002-06-14 | Babcock Hitachi Kk | Deaerating system and its operating method |
| CN101846105A (en) * | 2010-06-11 | 2010-09-29 | 华北电力科学研究院(西安)有限公司 | Anti-cavitation protection device of feedwater pump |
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2015
- 2015-04-30 CN CN201510217721.2A patent/CN104791261A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08327010A (en) * | 1995-06-02 | 1996-12-10 | Toshiba Corp | Water hammer preventing apparatus for water supply system |
| JP2002168404A (en) * | 2000-11-30 | 2002-06-14 | Babcock Hitachi Kk | Deaerating system and its operating method |
| CN101846105A (en) * | 2010-06-11 | 2010-09-29 | 华北电力科学研究院(西安)有限公司 | Anti-cavitation protection device of feedwater pump |
Non-Patent Citations (2)
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| 王飞等: "基于数字化控制平台的核电站除氧器压力控制策略设计", 《热力发电》 * |
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Application publication date: 20150722 |