CN203386481U - Nuclear power station essential service water system - Google Patents
Nuclear power station essential service water system Download PDFInfo
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- CN203386481U CN203386481U CN201320444500.5U CN201320444500U CN203386481U CN 203386481 U CN203386481 U CN 203386481U CN 201320444500 U CN201320444500 U CN 201320444500U CN 203386481 U CN203386481 U CN 203386481U
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- heat exchanger
- nuclear power
- power station
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- essential service
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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
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Abstract
The utility model relates to a nuclear power station essential service water system. The nuclear power station essential service water system comprises mutually parallel water pumps (1) and mutually parallel heat exchangers (3), wherein the water pumps (1) and the heat exchangers (3) are connected through main pipelines (4), a main bypass pipeline (5) is arranged between the main pipeline (4) before the heat exchangers (3) and the main pipeline (4) after the heat exchangers (3), and one auxiliary bypass pipeline (6) is respectively arranged between the main pipeline (4) before each of the heat exchangers (3) and each of the heat exchangers. Through the technical scheme, the problem that temperature of outlet water at a plate type heat exchanger side is excessively low is solved, so safe operation of a main pump and nuclear island equipment is guaranteed.
Description
Technical field
The utility model belongs to nuclear power station essential service water field, is specifically related to a kind of cold water excessively cold essential service water system of nuclear power station in winter that prevents from establishing.
Background technology
Essential service water system of nuclear power station SEC is from large marine water intaking, seawater is promoted by essential service water pump after filter plant filters, then enter the SEC/RRI heat exchanger through shellfish catcher, the thermal load that component cooling water system RRI is collected is taken away, and finally enters seawater.At present domestic built and in building nuclear power station, the every unit of essential service water system of nuclear power station arranges two series, as shown in Figure 1, every series arranges the important plant pump for nuclear power plant 1 of two 100%, one group of shellfish catcher 2 and two s' 50% SEC/RRI heat exchanger 3, two parallel water pumps and two heat exchangers in parallel, connect by a main pipeline 4.
But there is limitation in above-mentioned essential service water system set-up mode: the seawater that sea water pump promotes, all for cools down, does not have regulatory function.For the lower factory site of marine site temperature in winter, summer in winter, temperature difference of seawater was larger, and when meeting safety reserve capacity requirement in summer, the low temperature seawater of use in winter isodose is cooling, to take away more heats by heat exchanger, thereby make heat exchange equipment chilled water one side outlet temperature too low.If directly use too low component cooling water to carry out coolingly to establishing the cold water user, can not meet each user to establishing the requirement of cold water temperature, and main pump and nuclear island equipment will be had a negative impact, bring unsafe factor.
The utility model content
For problems of the prior art, the utility model provides a kind of essential service water system of nuclear power station, can regulate heat exchange equipment cold water side leaving water temperature according to seasonal variations, not only can meet each user to establishing the requirement of cold water temperature; Can also guarantee main pump and nuclear island device security reliability service.
For reaching above purpose, the technical solution adopted in the utility model is: a kind of essential service water system of nuclear power station, comprise water pump parallel with one another and heat exchanger parallel with one another, described water pump is connected by main pipeline with heat exchanger, between the main pipeline before described heat exchanger and the main pipeline after heat exchanger, is provided with main bypass duct; Be provided with the auxiliary bypass pipeline between main pipeline and heat exchanger lateral before each heat exchanger.
Further, be provided with successively import butterfly valve, variable valve, flowmeter and exit butterfly valve on described main bypass duct.
Further, be provided with successively the import butterfly valve on described auxiliary bypass pipeline, variable valve and exit butterfly valve.
Further, described heat exchanger lateral import and export is respectively equipped with electric butterfly valve.
Further, the main pipeline between water pump and heat exchanger is provided with shellfish catcher.
Useful technique effect of the present utility model is:
(1) main bypass duct and auxiliary bypass pipeline are set in essential service water system of nuclear power station, control heat exchanger seawater inflow-rate of water turbine by regulating valve opening on pipeline, control the heat exchange amount of component cooling water in heat exchanger, meet under the different operating conditions of winter and summer the requirement of component cooling water leaving water temperature;
(2) at heat exchanger water side lateral import and export, electrically operated valve is set respectively, by valve opening and closing, controls heat exchanger operation quantity, thereby reach the inflow-rate of water turbine of controlling seawater;
(3) in addition, the electrically operated valve of closing under accident conditions can all be opened rapidly, makes seawater all flow through heat exchanger for the cooling device chilled water, to guarantee safe shutdown.
The accompanying drawing explanation
Fig. 1 is the structural representation of prior art essential service water system of nuclear power station;
Fig. 2 is the structural representation of the utility model essential service water system of nuclear power station.
In figure:
1-water pump 2-shellfish catcher 3-heat exchanger 4-main pipeline 5-master bypass duct
6-auxiliary bypass pipeline 7,11-import butterfly valve 8-variable valve 9-flowmeter
10,13-exit butterfly valve 12-variable valve 14,15-electric butterfly valve 16-master-control room
The 17-lateral
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail.
As shown in Figure 2, essential service water system of nuclear power station provided by the utility model, comprise two water pumps that are arranged in parallel 1 and two SEC/RRI heat exchangers 3 that are arranged in parallel, water pump is connected by main pipeline 4 with heat exchanger, is provided with shellfish catcher 2 between water pump and heat exchanger.Water pump 1, from large marine water intaking, then enters heat exchanger 3 through shellfish catcher 2, and the thermal load that component cooling water is collected is taken away, and finally through main pipeline, enters in seawater again.For fear of in the winter time the time, heat exchange equipment chilled water one side outlet temperature is too low, so be provided with a main bypass duct 5 between the main pipeline 4 before shellfish catcher 2 and the main pipeline after heat exchanger; Be provided with auxiliary bypass pipeline 6 between main pipeline 4 after shellfish catcher 2 and the lateral 17 before each heat exchanger 3.
Wherein, be provided with successively import butterfly valve 7, variable valve 8, flowmeter 9 and exit butterfly valve on main bypass duct, by the aperture of regulating valve on main bypass duct, control heat exchanger seawater inflow-rate of water turbine.
Be provided with successively import butterfly valve 11 on the auxiliary bypass pipeline, variable valve 12 and exit butterfly valve 13, control heat exchanger seawater inflow-rate of water turbine again by the aperture of regulating valve on the auxiliary bypass pipeline.
The import and export of each heat exchanger lateral 17 is provided with electric butterfly valve 14,15, by the keying of valve, controls the quantity of heat exchanger operation.
Above-mentioned flowmeter 9, electric butterfly valve 14,15 variable valve 12 and heat exchanger are controlled by master-control room 16.
Below the course of work of the utility model essential service water system of nuclear power station described:
Under nominal situation, the operational mode of nuclear power station essential service water side mainly is divided into: summer operation pattern and winter operation pattern.The summer operation pattern is normal operation mode, it is conventional essential service water system of nuclear power station operational mode, when summer condition moves, the valve on main bypass duct 5 and auxiliary bypass pipeline 6 is closed condition, and seawater enters each heat exchanger after by shellfish catcher 2.The total water amount of each heat interchanger is equal to essential service water water pump total supply.
During winter; if adopt the operational mode in summer; can cause heat exchange equipment chilled water one side outlet temperature too low; cause the damage of the water pump of establishing the cold water user and other equipment; so take two kinds of operational modes in the time of in the winter time; winter, first grade of anti-cold operation pattern and the anti-cold operation pattern of second gear in winter, carried out the protection to water pump and other equipment.When first grade of anti-cold operation pattern is operating mode operation in the winter time, when heat exchange equipment cooling water side leaving water temperature is reduced to 15 ℃ first, report to the police to master-control room 16, open main bypass duct 5 import and export dish valves 7,10, main bypass duct variable valve 8 puts into operation, then the import and export dish valve 14,15 before and after cutting out in operation row on a heat exchanger lateral, put into operation by another heat exchanger, thus the first grade of anti-cold operation pattern that enters winter condition.
Wherein, variable valve 8 apertures on main bypass duct 7 are adjusted by master-control room in the system debug stage, even the drag characteristic of main by-pass line is identical with the drag characteristic of the heat exchanger of flowing through, in a cycle of operation, the aperture of this variable valve remains constant.
When heat exchange equipment cooling water side leaving water temperature is reduced to 15 ℃ again, report to the police to master-control room 16, open auxiliary bypass pipeline 6, the valve 11,13 on the auxiliary bypass pipeline is opened, variable valve 12 puts into operation, enters the anti-cold operation pattern of second gear of winter condition.Can be according to establishing the cold water side leaving water temperature, valve opening automatically adjusts, thereby controls the inflow-rate of water turbine of heat exchanger water side.
Under the anti-cold operation pattern of second gear, when variable valve 12 during in full-gear, when heat exchanger is established the cold water side leaving water temperature and is increased to 30 ℃, open the import and export dish valve 14,15 be closed on the heat exchanger lateral, then close the valve on main bypass duct and auxiliary bypass pipeline, return to the operational mode of summer condition.
In the winter time under operational mode, as the situation of emergency shut-down occurs, heat exchanger lateral import and export butterfly valve 14,15 sends signal by master-control room, opens immediately, to guarantee safe shutdown.
When the nuclear power station essential service water series of moving, when preventing the cold operation pattern, standby series need to be carried out identical operation, and standby series can be put into operation at any time, and, when the switching of needs series, keeps the characteristics of fluid state identical with operation.
Essential service water system of nuclear power station of the present utility model is not limited to above-mentioned embodiment, and those skilled in the art draw other embodiment according to the technical solution of the utility model, belongs to equally technological innovation scope of the present utility model.
Claims (5)
1. an essential service water system of nuclear power station, comprise water pump parallel with one another (1) and heat exchanger (3) parallel with one another, described water pump (1) is connected by main pipeline (4) with heat exchanger (3), it is characterized in that: between the main pipeline (4) that described heat exchanger (3) is front and the main pipeline (4) after described heat exchanger (3), be provided with main bypass duct (5); Be provided with auxiliary bypass pipeline (6) between main pipeline (4) before each heat exchanger and the lateral (17) of respective heat exchanger.
2. essential service water system of nuclear power station as claimed in claim 1, is characterized in that: be provided with successively import butterfly valve (7), variable valve (8), flowmeter (9) and exit butterfly valve (10) on described main bypass duct (5).
3. essential service water system of nuclear power station as claimed in claim 1, is characterized in that: be provided with successively import butterfly valve (11) on described auxiliary bypass pipeline, variable valve (12) and exit butterfly valve (13).
4. as the described essential service water system of nuclear power station of claim 1-3 any one, it is characterized in that: the import and export of described heat exchanger (3) lateral is respectively equipped with electric butterfly valve (14,15).
5. essential service water system of nuclear power station as claimed in claim 4, it is characterized in that: the main pipeline (4) between described water pump (1) and described heat exchanger (3) is provided with shellfish catcher (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320444500.5U CN203386481U (en) | 2013-07-24 | 2013-07-24 | Nuclear power station essential service water system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320444500.5U CN203386481U (en) | 2013-07-24 | 2013-07-24 | Nuclear power station essential service water system |
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| Publication Number | Publication Date |
|---|---|
| CN203386481U true CN203386481U (en) | 2014-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320444500.5U Expired - Lifetime CN203386481U (en) | 2013-07-24 | 2013-07-24 | Nuclear power station essential service water system |
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| Country | Link |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464844A (en) * | 2014-12-08 | 2015-03-25 | 中广核工程有限公司 | Nuclear power plant cold chain system and cold water effluent temperature regulation method thereof |
| CN105551548A (en) * | 2016-01-25 | 2016-05-04 | 中国核电工程有限公司 | Nuclear power plant equipment cooling water system and water temperature adjusting method therefor |
| CN111271603A (en) * | 2020-01-17 | 2020-06-12 | 岭东核电有限公司 | Nuclear power station valve diaphragm maintenance method |
| CN111430049A (en) * | 2020-03-19 | 2020-07-17 | 福建福清核电有限公司 | A return circuit for solving nuclear power station equipment cooling water system low temperature problem in winter |
| CN113161027A (en) * | 2021-03-09 | 2021-07-23 | 广东核电合营有限公司 | Nuclear power station SEC system fault detection method, device, equipment and storage medium |
-
2013
- 2013-07-24 CN CN201320444500.5U patent/CN203386481U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104464844A (en) * | 2014-12-08 | 2015-03-25 | 中广核工程有限公司 | Nuclear power plant cold chain system and cold water effluent temperature regulation method thereof |
| CN105551548A (en) * | 2016-01-25 | 2016-05-04 | 中国核电工程有限公司 | Nuclear power plant equipment cooling water system and water temperature adjusting method therefor |
| CN111271603A (en) * | 2020-01-17 | 2020-06-12 | 岭东核电有限公司 | Nuclear power station valve diaphragm maintenance method |
| CN111430049A (en) * | 2020-03-19 | 2020-07-17 | 福建福清核电有限公司 | A return circuit for solving nuclear power station equipment cooling water system low temperature problem in winter |
| CN113161027A (en) * | 2021-03-09 | 2021-07-23 | 广东核电合营有限公司 | Nuclear power station SEC system fault detection method, device, equipment and storage medium |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140108 |