CN204407020U - A kind of low discharge backflow and current limiting control apparatus - Google Patents
A kind of low discharge backflow and current limiting control apparatus Download PDFInfo
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- CN204407020U CN204407020U CN201420854610.3U CN201420854610U CN204407020U CN 204407020 U CN204407020 U CN 204407020U CN 201420854610 U CN201420854610 U CN 201420854610U CN 204407020 U CN204407020 U CN 204407020U
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- low discharge
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- current limiting
- limiting control
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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 utility model provides a kind of low discharge to reflux and current limiting control apparatus, for nuclear power station start and stop water supply system and/or auxiliary feedwater system, comprise the flowmeter, Automatic Re circulating Valve, current-limiting apparatus and the first isolation valve that are connected to nuclear power station start and stop water supply system and/or auxiliary feedwater system sprue, the bypass valve of Automatic Re circulating Valve, non-return valve and the second isolation valve are connected by pipeline successively, form nuclear power station start and stop water supply system and/or auxiliary feedwater system low discharge return flow line.The low discharge backflow that the utility model provides and current limiting control apparatus, have employed passive component Automatic Re circulating Valve and reduction valve realizes low discharge backflow functionality, passive component restriction orifice is adopted to realize current-limiting function, improve reliability and the security of low discharge backflow and current limiting control apparatus, thus ensure the safe operation of nuclear power station.
Description
Technical field
The utility model relates to nuclear power station start and stop water supply system and auxiliary feedwater system, is specifically related to the backflow of a kind of low discharge for nuclear power station start and stop (assisting) water supply system and current limiting control apparatus.
Background technology
The start and stop water supply system of PWR of Nuclear Power Station unit starting, stand-by heat and shutdown time to steam generator water-filling, take away reactor core heat.The auxiliary feedwater system of PWR of Nuclear Power Station used when main feedwater is lost efficacy, under the breakdown operating mode of power station, auxiliary feedwater system is used for maintaining power station hot shutdown operating mode with time enough, and reactor is cooled to the state that residual heat removal system can put into operation.Auxiliary feedwater system belongs to engineered safeguards features, and under the transient state losing main feedwater or secondary side steam line break, auxiliary feedwater system is used to prevent reactor core from damaging, and discharges reactor core decay heat, until residual heat removal system puts into operation.
Start and stop (assisting) water supply system is provided with the minimum operating flux requirement that low discharge reflux pipeline ensures pump usually, is provided with the maximum operating flux of flow-limiting valve for restrictive pump simultaneously, prevents pump from surpassing flow.Meet these two requirements most important for the safe operation of nuclear power station, if low discharge reflux pipeline can not ensure the minimum operating flux requirement of pump, centrifugal pump is under a low load because overheated, noise, vibration can cause damage simultaneously; If exceed the maximum operating flux of pump, pump can be caused to damage, and containment Mass and energy release exceed safety analysis limit value.
As shown in Figure 1, start and stop (assisting) water supply system comprises the backflow of the reserve tank 3 be arranged at outside containment, pump intake isolation valve 4, feed pump 5 and low discharge and current limiting control apparatus 1, to be arranged in the containment in containment isolation valve 7, steam generator 8 in non-return valve 6, containment.
Low discharge backflow comprises the non-return valve 15 be arranged in sprue, flowmeter 16, flow-limiting valve 17, variable valve 18 and isolation valve 19 with current limiting control apparatus 1, be arranged on the step-down orifice plate 11 in low discharge reflux pipeline, non-return valve 12, control valve for small flows 13 and isolation valve 14, variable valve 18 in the flow signal control sprue obtained by flowmeter 16 and flow-limiting valve 17, control control valve for small flows 13 simultaneously, when flow is less than the minimum continuous operating flux of feed pump 5, control valve for small flows 13 is opened, and realizes low discharge backflow functionality; When flow reaches maximum flow, limit maximum flow by flow-limiting valve 17, thus the minimum operating flux meeting feed pump 5 requires and maximum operating flux requirement.
General variable valve and flow-limiting valve adopt operated pneumatic valve.
In the operational process of PWR of Nuclear Power Station, once lose source of the gas/power supply will cause the inefficacy of operated pneumatic valve/electrically operated valve, affect the normal work of start and stop (assisting) water supply system, thus affect the safe operation of nuclear power station.
Those skilled in the art are devoted to provide a kind of more reliable, safer low discharge to reflux and current limiting control apparatus, reduce using pneumatic or electrically operated valve as far as possible, adopt passive component, to improve nuclear power station reliability of operation.
Summary of the invention
In view of the defect existed in prior art, the purpose of this utility model is to provide a kind of nuclear power station start and stop (assisting) water supply system low discharge to reflux and current limiting control apparatus, can more reliably, more safely work, to ensure the safe operation of nuclear power station.
If in low discharge backflow with current limiting control apparatus, reduce as far as possible and use pneumatic or electrically operated valve, adopt passive component, not only simplify low discharge backflow and current limiting control apparatus, and improve reliability and the security of low discharge backflow and current limiting control apparatus, thus improve nuclear power station reliability of operation.
Low discharge backflow functionality adopts Automatic Re circulating Valve to realize; Automatic Re circulating Valve is also known as pump-protecting valve or minimum flow valve; for the automatic recirculating of centrifugal pump minimum flow; prevent centrifugal pump under a low load due to overheated; the damage that noise, vibration bring; Automatic Re circulating Valve is self force type control valve, i.e. passive component, does not need the outside supply energy.
The utility model provides a kind of low discharge to reflux and current limiting control apparatus, for start and stop water supply system and/or auxiliary feedwater system, comprise the flowmeter, Automatic Re circulating Valve, current-limiting apparatus and the first isolation valve that are connected to start and stop water supply system and/or auxiliary feedwater system sprue, the bypass valve of Automatic Re circulating Valve, non-return valve and the second isolation valve are connected by pipeline successively, form start and stop water supply system and/or auxiliary feedwater system low discharge return flow line.
The low discharge backflow that the utility model provides and current limiting control apparatus, have employed Automatic Re circulating Valve, when the sprue flow of Automatic Re circulating Valve is less than the minimum operating flux of pump, valve shunts is opened automatically, ensures that the flow sum of sprue and bypass meets the minimum operating flux requirement of pump.
The low discharge backflow that the utility model provides and current limiting control apparatus, adopt current-limiting apparatus, the flow of restrictive pump, prevents pump discharge from exceeding maximum operating flux, and the minimum operating flux that thus simultaneously can meet pump requires and maximum operating flux requirement.
Automatic Re circulating Valve has check function, between current-limiting apparatus and the first isolation valve, non-return valve is not set, simplify low discharge backflow and current limiting control apparatus, and improve reliability and the security of low discharge backflow and current limiting control apparatus further, thus improve nuclear power station reliability of operation.
Further, current-limiting apparatus is restriction orifice.
Restriction orifice is passive component, restriction orifice is adopted to prevent pump discharge from exceeding maximum operating flux, without the need to connecting source of the gas or power supply, not only simplify low discharge backflow and current limiting control apparatus, and improve reliability and the security of low discharge backflow and current limiting control apparatus further, thus improve nuclear power station reliability of operation.
Further, between the bypass valve of Automatic Re circulating Valve and non-return valve, reduction valve being set, for maintaining the pressure of Automatic Re circulating Valve bypass outlet setting, preventing cavitation.
Further, low discharge backflow also comprises flow control valve, for regulating feedwater flow with current limiting control apparatus.
Further, the aperture of described flow control valve is controlled by the signal of flowmeter and the bypass pressure difference signal of Automatic Re circulating Valve.
Compared with prior art, the backflow of the low discharge for start and stop (assisting) water supply system that the utility model provides and current limiting control apparatus, have following beneficial effect:
(1) have employed passive component Automatic Re circulating Valve, by automatically regulate pump total flow is maintained pump minimum continous-stable flow more than, ensure that the flow sum of sprue and bypass meets the minimum operating flux requirement of pump, improve reliability and the security of low discharge backflow and current limiting control apparatus;
(2) low discharge reflux pipeline is provided with passive component reduction valve, prevents the bypass outlet of Automatic Re circulating Valve from occurring cavitation, improves reliability and the security of low discharge backflow and current limiting control apparatus further;
(3) passive component restriction orifice is adopted, prevent pump discharge from exceeding maximum flow, without the need to connecting source of the gas or power supply, not only simplify low discharge backflow and current limiting control apparatus, and improve reliability and the security of low discharge backflow and current limiting control apparatus further;
(4) by the bypass differential pressure measurement bypass flow of Automatic Re circulating Valve, the aperture of flow control valve is controlled by the signal of flowmeter and the bypass pressure difference signal of Automatic Re circulating Valve.
Accompanying drawing explanation
Fig. 1 is for the low discharge backflow of nuclear power station start and stop (assisting) water supply system and the annexation schematic diagram of current limiting control apparatus in prior art;
Fig. 2 is the backflow of the low discharge for nuclear power station start and stop (assisting) water supply system of an embodiment of the present utility model and the annexation schematic diagram of current limiting control apparatus;
Fig. 3 is the backflow of the low discharge for nuclear power station start and stop (assisting) water supply system of another embodiment of the present utility model and the annexation schematic diagram of current limiting control apparatus.
Embodiment
In order to understand the utility model more clearly, below in conjunction with accompanying drawing, low discharge backflow of the present utility model and current limiting control apparatus are described further.
As shown in Figure 2, nuclear power station start and stop (assisting) water supply system is arranged on outside the containment of reactor, comprise the backflow of reserve tank 3, pump intake isolation valve 4, feed pump 5 and low discharge and current limiting control apparatus 2, to be arranged in the containment in containment isolation valve 7, steam generator 8 in non-return valve 6, containment.
Low discharge backflow and the current limiting control apparatus 2 of the present embodiment, comprise the flowmeter 21, Automatic Re circulating Valve 22, flow control valve 27, current-limiting apparatus and the first isolation valve 29 that are connected to nuclear power station start and stop water supply system and/or auxiliary feedwater system sprue, the bypass valve of Automatic Re circulating Valve 22, non-return valve 24 and the second isolation valve 25 are connected by pipeline successively, form nuclear power station start and stop water supply system and/or auxiliary feedwater system low discharge return flow line.
When nuclear power plant's normal power runs, start and stop (assisting) water supply system is in stand-by state, and the first isolation valve 29 and Automatic Re circulating Valve 22 all have isolation features.When needs start and stop (assisting) water supply system supplies water to steam generator, feed pump 5 starts, and absorb water to steam generator 8 from reserve tank 3 and supply water, flow control valve 27 is pneumatic control valve, by the aperture of flow signal 26 regulating and controlling valve 27, by flow regulation to setting value.
Along with steam generator 8 traffic demand reduces, the aperture of flow control valve 27 reduces gradually, time below the minimum continuous and steady operation flow that demand volume is reduced to feed pump 5, the bypass of Automatic Re circulating Valve 22 is opened automatically, ensures that the flow of sprue and bypass flow sum are minimum continuous and steady operation flow.
Current-limiting apparatus can be flow-limiting valve, can be also restriction orifice, and in the present embodiment, current-limiting apparatus adopts restriction orifice.
When steam generator 8 back pressure reduces, the flow of feed pump 5 will increase, in order to limit feedwater flow, water-supply line is provided with restriction orifice 28, when flow reaches maximum flow, feed pressure is reduced to saturation pressure corresponding to feed temperature by restriction orifice 28, feeds water in the appearance vaporization of restriction orifice 28 aperture place, resistance to flow when greatly, limits the further increase of flow rapidly.
Restriction orifice is passive component, restriction orifice is adopted to prevent pump discharge from exceeding maximum operating flux, without the need to connecting source of the gas or power supply, not only simplify low discharge backflow and current limiting control apparatus, and improve reliability and the security of low discharge backflow and current limiting control apparatus further, thus improve nuclear power station reliability of operation.
Between the bypass valve of Automatic Re circulating Valve 22 and non-return valve 24, reduction valve 23 being set, for maintaining the pressure of Automatic Re circulating Valve 22 bypass outlet setting, preventing cavitation.
Maintained the back pressure of bypass by reduction valve 23, prevent bypass from occurring cavitation.
The aperture of flow control valve 27 is controlled by the signal of flowmeter 21 and the bypass pressure difference signal of Automatic Re circulating Valve 22.
Bypass pressure difference signal is converted to flow signal, and the measuring flow of flowmeter 21 deducts bypass flow and is the flow entering steam generator 8, by the aperture of flow signal 26 control flow check adjustable valve 27.Achieve the flow control to entering steam generator 8, and ensure that minimum continuous and steady operation flow.
Automatic Re circulating Valve 22 has check function, between restriction orifice 28 and the first isolation valve 29, non-return valve is not set, simplify low discharge backflow and current limiting control apparatus 2, and improve reliability and the security of low discharge backflow and current limiting control apparatus 2 further, thus improve nuclear power station reliability of operation.
The low discharge backflow of the present embodiment and current-limiting apparatus, adopt Self-operated valve and passive component practical function as far as possible, reduce use that is pneumatic or electrically operated valve, improves reliability and the security of system cloud gray model.
As shown in Figure 3, nuclear power station start and stop (assisting) water supply system is arranged on outside the containment of reactor, be with the difference of nuclear power station start and stop (assisting) water supply system shown in Fig. 2: low discharge refluxes and current limiting control apparatus 2 does not comprise flow control valve, is connected by interface arrangement 9 with the non-return valve 6 in containment; Feedwater flow regulation is completed by the flow measurement in interface arrangement 9 and regulating device.
The low discharge backflow of the present embodiment and current-limiting apparatus, do not comprise flow control valve, no longer rely on external air source, improves reliability and the security of low discharge backflow and current limiting control apparatus further.
The backflow of the low discharge for start and stop (assisting) water supply system that the utility model provides and current limiting control apparatus, have employed passive component Automatic Re circulating Valve, by automatically regulate pump total flow is maintained pump minimum continous-stable flow more than, ensure that the flow sum of sprue and bypass meets the minimum operating flux requirement of pump; Low discharge reflux pipeline is provided with passive component reduction valve, prevents the bypass outlet of Automatic Re circulating Valve from occurring cavitation; Delivery side of pump pipeline installing current limiting orifice plate, for the flow of restrictive pump, prevents pump discharge from exceeding maximum flow; Variable valve on delivery side of pump pipeline passes through the aperture of pump discharge house steward flow signal and Automatic Re circulating Valve bypass pressure difference signal regulating and controlling valve, thus regulates feedwater flow; Have employed passive component Automatic Re circulating Valve, reduction valve and restriction orifice, no longer rely on external air source/power supply, avoid the inefficacy causing operated pneumatic valve/electrically operated valve when losing source of the gas/power supply, affect the normal work of start and stop (assisting) water supply system, improve reliability and the security of low discharge backflow and current limiting control apparatus, thus ensure the safe operation of nuclear power station.
More than describe preferred embodiment of the present utility model in detail.Should be appreciated that those of ordinary skill in the art just can make many modifications and variations according to design of the present utility model without the need to creative work.Therefore, all technician in the art according to design of the present utility model on the basis of existing technology by the available technical scheme of logical analysis, reasoning, or a limited experiment, all should by the determined protection domain of claims.
Claims (5)
1. a low discharge backflow and current limiting control apparatus, for start and stop water supply system and/or auxiliary feedwater system, it is characterized in that, comprise the flowmeter, Automatic Re circulating Valve, current-limiting apparatus and the first isolation valve that are connected to described start and stop water supply system and/or auxiliary feedwater system sprue successively, the bypass valve of described Automatic Re circulating Valve, non-return valve and the second isolation valve are connected by pipeline successively, form described start and stop water supply system and/or auxiliary feedwater system low discharge return flow line.
2. low discharge backflow as claimed in claim 1 and current limiting control apparatus, it is characterized in that, described current-limiting apparatus is restriction orifice.
3. low discharge backflow as claimed in claim 1 and current limiting control apparatus, it is characterized in that, between the described bypass valve of described Automatic Re circulating Valve and described non-return valve, reduction valve being set, for maintaining the pressure of described Automatic Re circulating Valve bypass outlet setting, preventing cavitation.
4. low discharge backflow as claimed in claim 1 and current limiting control apparatus, is characterized in that, described low discharge backflow also comprises flow control valve with current limiting control apparatus.
5. low discharge backflow as claimed in claim 4 and current limiting control apparatus, it is characterized in that, the aperture of described flow control valve is controlled by the signal of described flowmeter and the bypass pressure difference signal of described Automatic Re circulating Valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420854610.3U CN204407020U (en) | 2014-12-26 | 2014-12-26 | A kind of low discharge backflow and current limiting control apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420854610.3U CN204407020U (en) | 2014-12-26 | 2014-12-26 | A kind of low discharge backflow and current limiting control apparatus |
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| CN204407020U true CN204407020U (en) | 2015-06-17 |
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| CN201420854610.3U Active CN204407020U (en) | 2014-12-26 | 2014-12-26 | A kind of low discharge backflow and current limiting control apparatus |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934080A (en) * | 2015-06-26 | 2015-09-23 | 上海核工程研究设计院 | Main water supply system of double-reactor nuclear power station |
| CN109212998A (en) * | 2017-06-29 | 2019-01-15 | 苏州热工研究院有限公司 | A kind of nuclear power plant's check-valves different flow operating condition flow resistance coefficient analogy method and system |
-
2014
- 2014-12-26 CN CN201420854610.3U patent/CN204407020U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104934080A (en) * | 2015-06-26 | 2015-09-23 | 上海核工程研究设计院 | Main water supply system of double-reactor nuclear power station |
| CN104934080B (en) * | 2015-06-26 | 2017-05-31 | 上海核工程研究设计院 | A kind of pair of main feed system of reactor of nuclear power plant |
| CN109212998A (en) * | 2017-06-29 | 2019-01-15 | 苏州热工研究院有限公司 | A kind of nuclear power plant's check-valves different flow operating condition flow resistance coefficient analogy method and system |
| CN109212998B (en) * | 2017-06-29 | 2021-06-04 | 苏州热工研究院有限公司 | Flow resistance coefficient simulation method and system for check valve of nuclear power plant under different flow working conditions |
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| C14 | Grant of patent or utility model | ||
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Address after: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee after: Shanghai Nuclear Engineering Research and Design Institute Co.,Ltd. Address before: No. 29 Hong Cao Road, Xuhui District, Shanghai Patentee before: SHANGHAI NUCLEAR ENGINEERING RESEARCH & DESIGN INSTITUTE |