CN103021481B - Auxiliary feedwater system feedwater pneumatic pump large discharge control method and control device - Google Patents
Auxiliary feedwater system feedwater pneumatic pump large discharge control method and control device Download PDFInfo
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- CN103021481B CN103021481B CN201210517735.2A CN201210517735A CN103021481B CN 103021481 B CN103021481 B CN 103021481B CN 201210517735 A CN201210517735 A CN 201210517735A CN 103021481 B CN103021481 B CN 103021481B
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- feedwater
- pneumatic pump
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
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Abstract
The invention belongs to pump body flow control technology, be specifically related to a kind of auxiliary feedwater system feedwater pneumatic pump large discharge control method and control device.The method measures the flow of feedwater pneumatic pump outlet, the maximum flow limits value set in the flow signal measured in real time and control system is compared, when measuring flow is more than or equal to the maximum flow limits value of setting, control the turbine admission valve of feedwater pneumatic pump, to turn down admission valve, reduce turbine speed, thus make the rate of discharge of feedwater pneumatic pump drop to setting value.The invention solves and determine rotating speed pneumatic pump in the low situation of pump discharge pressure, easily cause the problem of flow pedal system performance requirement bigger than normal and discontented, prevent flow excessive and make pump cavitation, generating pump damages and causes auxiliary feedwater afunction.
Description
Technical field
The invention belongs to pump body flow control technology, be specifically related to a kind of auxiliary feedwater system feedwater pneumatic pump large discharge control method and control device.
Background technology
Auxiliary feedwater system is the ad hoc system of important safety in pressurized-water reactor nuclear power plant.When it has an accident during reactor operation pattern, can guarantee to the enough water of steam generator supply, to discharge residual heat of nuclear core.Two pneumatic pumps and two electrodynamic pumps are designed with in the design of current feed pump, and the auxiliary feedwater pneumatic pump selected at present is when maximum flow point, lift is greater than the performance that designed auxiliary feedwater system requires, therefore need to adopt the method for reduction of speed to adjust the performance of this operating point, to meet the requirement of auxiliary feedwater system.
Meanwhile, if pump discharge pressure is too low, flow is excessive, can cause the cavitation of pump, causes very large damage like this to pump itself, so that the forfeiture of feeding water function, causes the unavailable of auxiliary feedwater system.So need the restriction adopting large discharge to control, in the heavy traffic condition decline slow-speed of revolution, prevent cavitation, protection is played to pumping unit itself, also indirect protection effect is played to the function of auxiliary feedwater.
Summary of the invention
The object of this invention is to provide a kind of a kind of flow control methods and the control device that can be used for the control of auxiliary feedwater system feedwater pneumatic pump large discharge, provide protection to pumping unit and auxiliary feedwater system.
Technical scheme of the present invention is as follows: a kind of auxiliary feedwater system feedwater pneumatic pump large discharge control method, the method measures the flow of feedwater pneumatic pump outlet, the maximum flow limits value set in the flow signal measured in real time and control system is compared, when measuring flow is more than or equal to the maximum flow limits value of setting, control the turbine admission valve of feedwater pneumatic pump, to turn down admission valve, reduce turbine speed, thus make the rate of discharge of feedwater pneumatic pump drop to setting value.
Further, auxiliary feedwater system feedwater pneumatic pump large discharge control method as above, wherein, after the rate of discharge of feedwater pneumatic pump drops to setting value, the rotating speed kept now runs by feedwater pneumatic pump.
A kind of auxiliary feedwater system feedwater pneumatic pump large discharge control device, comprise the flowmeter being arranged on pneumatic pump outlet, flowmeter is connected with control system, in real time pneumatic pump rate of discharge signal is delivered to control system; Control system connects the turbine admission valve of feedwater pneumatic pump, according to the relation between the pneumatic pump rate of discharge signal received and the maximum flow limits value of setting, regulates admission valve valve position, controls the rate of discharge of feedwater pneumatic pump.
Further, auxiliary feedwater system feedwater pneumatic pump large discharge control device as above, wherein, described flow counts the online flow measurement device that can characterize flow or the flow measurement device coordinated with restriction device and differential pressure transmitter, directly exports 4 ~ 20mA signal to large discharge control system.
Further, auxiliary feedwater system feedwater pneumatic pump large discharge control device as above, wherein, described control system is controller or digital control system in nuclear power plant.
Beneficial effect of the present invention is as follows:
(1) flow control methods provided by the present invention solves owing to determining rotating speed pneumatic pump in the low situation of pump discharge pressure, easily causes the problem of flow pedal system performance requirement bigger than normal and discontented;
(2) flow control methods provided by the present invention prevent due to pump discharge pressure low when, flow is excessive and make pump cavitation, generating pump damage and cause auxiliary feedwater afunction.
Accompanying drawing explanation
Fig. 1 is pressurized-water reactor nuclear power plant auxiliary feedwater pneumatic pump large discharge regulating system process flow diagram.
In figure, 1. pneumatic pump, 2. steam turbine, 3. admission variable valve, 4. control system, 5. flowmeter.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in detail.
As shown in Figure 1, auxiliary feedwater system feedwater pneumatic pump large discharge control device provided by the present invention, comprise the flowmeter 5 being arranged on pneumatic pump 1 and exporting, flowmeter 5 is connected with control system 4, in real time pneumatic pump 1 rate of discharge signal is delivered to control system 4; The admission valve 3 of the steam turbine 2 of feedwater pneumatic pump is delivered in the output of control system 4, according to the relation between the pneumatic pump rate of discharge signal received and the maximum flow limits value of setting, regulate the valve position of admission valve 3, the rate of discharge of feedwater pneumatic pump 1 is controlled.
Flowmeter 5 is arranged on the export pipeline of auxiliary feedwater system pneumatic pump 1, after flowmeter survey delivery side of pump total flow, exports the current signal of 4 ~ 20mA to Control System of Rotational Speed of Steam Turbine 4(or controller).
After control system 4 receives flow signal, compare with the maximum flow limits value preset, when pump discharge flows exceed the maximum flow restriction of setting, control system 4 sends 4 ~ 20mA current signal to the admission variable valve 3 of steam turbine 2, to turn down admission valve, reduce the throttle flow of steam turbine 2, pneumatic pump 1 rotating speed is reduced, thus makes pneumatic pump 1 flow drop to setting value.After pneumatic pump 1 rate of discharge drops to setting value in advance, the rotating speed kept now runs by pump group.
This flow restriction controlling functions can coordinate with pump speed control system, as the auxiliary control of pump speed control system, and restrictive pump rate of discharge.
The flow measurement device that flowmeter 5 can be selected the online flow measurement device for characterizing flow or coordinate with restriction device and differential pressure transmitter, directly exports 4 ~ 20mA signal to large discharge control system.Control system can be simple PI D controller, also can be powerful digital control system in nuclear power plant (DCS).
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if belong within the scope of the claims in the present invention and equivalent technology thereof to these amendments of the present invention and modification, then the present invention is also intended to comprise these change and modification.
Claims (5)
1. an auxiliary feedwater system feedwater pneumatic pump large discharge control method, it is characterized in that: the method measures the flow of feedwater pneumatic pump outlet, the maximum flow limits value set in the flow signal measured in real time and control system is compared, when measuring flow is more than or equal to the maximum flow limits value of setting, control the turbine admission valve of feedwater pneumatic pump, to turn down admission valve, reduce turbine speed, thus make the rate of discharge of feedwater pneumatic pump drop to setting value.
2. auxiliary feedwater system feedwater pneumatic pump large discharge control method as claimed in claim 1, it is characterized in that: after the rate of discharge of feedwater pneumatic pump drops to setting value, the rotating speed kept now runs by feedwater pneumatic pump.
3. an auxiliary feedwater system feedwater pneumatic pump large discharge control device, it is characterized in that: comprise the flowmeter (5) being arranged on pneumatic pump (1) and exporting, flowmeter (5) is connected with control system (4), in real time pneumatic pump (1) rate of discharge signal is delivered to control system (4); Control system (4) connects the admission valve (3) of the steam turbine (2) of feedwater pneumatic pump, according to the relation between the pneumatic pump rate of discharge signal received and the maximum flow limits value of setting, regulate admission valve (3) valve position, the rate of discharge of feedwater pneumatic pump (1) is controlled.
4. auxiliary feedwater system feedwater pneumatic pump large discharge control device as claimed in claim 3, it is characterized in that: described flowmeter (5) is the online flow measurement device that can characterize flow or the flow measurement device coordinated with restriction device and differential pressure transmitter, directly exports 4 ~ 20mA signal to large discharge control system.
5. the auxiliary feedwater system feedwater pneumatic pump large discharge control device as described in claim 3 or 4, is characterized in that: described control system (4) is controller or digital control system in nuclear power plant.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210517735.2A CN103021481B (en) | 2012-12-05 | 2012-12-05 | Auxiliary feedwater system feedwater pneumatic pump large discharge control method and control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210517735.2A CN103021481B (en) | 2012-12-05 | 2012-12-05 | Auxiliary feedwater system feedwater pneumatic pump large discharge control method and control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103021481A CN103021481A (en) | 2013-04-03 |
| CN103021481B true CN103021481B (en) | 2015-11-04 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201210517735.2A Active CN103021481B (en) | 2012-12-05 | 2012-12-05 | Auxiliary feedwater system feedwater pneumatic pump large discharge control method and control device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4654190A (en) * | 1984-04-05 | 1987-03-31 | Westinghouse Electric Corp. | Emergency feedwater system for steam generators of a nuclear power plant |
| CN201514234U (en) * | 2009-04-01 | 2010-06-23 | 上海开仪电子技术有限公司 | Multi-parameter differential pressure type flow testing device |
| CN102024503A (en) * | 2010-05-27 | 2011-04-20 | 中国核电工程有限公司 | Pneumatic auxiliary feed water pump of pressurized water reactor power station |
| CN102080579A (en) * | 2010-12-10 | 2011-06-01 | 中国广东核电集团有限公司 | Method and device for controlling starting and stopping of turbo generator set of nuclear power plant, and digital control system (DCS) |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5464848U (en) * | 1977-10-17 | 1979-05-08 |
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2012
- 2012-12-05 CN CN201210517735.2A patent/CN103021481B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4654190A (en) * | 1984-04-05 | 1987-03-31 | Westinghouse Electric Corp. | Emergency feedwater system for steam generators of a nuclear power plant |
| CN201514234U (en) * | 2009-04-01 | 2010-06-23 | 上海开仪电子技术有限公司 | Multi-parameter differential pressure type flow testing device |
| CN102024503A (en) * | 2010-05-27 | 2011-04-20 | 中国核电工程有限公司 | Pneumatic auxiliary feed water pump of pressurized water reactor power station |
| CN102080579A (en) * | 2010-12-10 | 2011-06-01 | 中国广东核电集团有限公司 | Method and device for controlling starting and stopping of turbo generator set of nuclear power plant, and digital control system (DCS) |
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| Publication number | Publication date |
|---|---|
| CN103021481A (en) | 2013-04-03 |
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