CN203250541U - Protector for water hammer of recirculated cooling water system in nuclear power plant - Google Patents
Protector for water hammer of recirculated cooling water system in nuclear power plant Download PDFInfo
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- CN203250541U CN203250541U CN2013202990952U CN201320299095U CN203250541U CN 203250541 U CN203250541 U CN 203250541U CN 2013202990952 U CN2013202990952 U CN 2013202990952U CN 201320299095 U CN201320299095 U CN 201320299095U CN 203250541 U CN203250541 U CN 203250541U
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- cooling water
- nuclear power
- power plant
- water system
- valve
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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 discloses a protector for the water hammer of a recirculated cooling water system in a nuclear power plant. The protector comprises a condenser and a siphoning destroying valve. The condenser is internally provided with an outlet water chamber. The siphoning destroying valve is arranged on the outlet water chamber. The protector for the water hammer of the recirculated cooling water system in the nuclear power plant also comprises a joint control unit which controls the opening of the siphoning destroying valve when a circulated water pump in the recirculated cooling water system stop working. The protector for the water hammer of the recirculated cooling water system in the nuclear power plant is low in cost and small in energy dissipation.
Description
Technical field
The utility model relates to the nuclear power field, in particular, relates to a kind of nuclear power plant recirculating cooling water system protecting water hammer device.
Background technology
Nuclear power plant's recirculating cooling water system by two independently pipeline provide essential cooling water flow to condenser, to guarantee the performance in power station.Nuclear power station recirculated water is taken from and is entered condenser 4 by the recirculated water inlet passage after plant area's water intaking channel boosts through water circulating pump 5 ', and then recirculated water enters marine by catch gutter.
In the prior art, some nuclear power station recirculated cooling water is seawater, recirculating cooling water system is valveless direct current hydrocone type water system, do not have valve in the system and utilized siphon height, can effectively reduce circulating pump head, if but under the termination of pumping operating mode, not taking safeguard procedures, system can produce " pump-stopping water hammer " phenomenon, has a strong impact on the security of operation of system.So-called " pump-stopping water hammer " refers to water circulating pump because having a power failure suddenly or other reasons, and when causing out the valve parking, water velocity changes and the pressure alternation phenomenon that causes in water pump and pipeline.
As shown in Figure 1, power plant circulating cooling water system water hammer safeguard procedures are generally in water circulating pump 5 ' outlet the protecting water hammer butterfly valve 6 that two stages closed are set, the protecting water hammer butterfly valve 6 of interlocked control water circulating pump 5 ' outlet is eliminated water hammer (wherein by predefined pass closed curve when water circulating pump 5 ' is stopped transport, 1 is the low-temperature receiver flow inlet, 2 is the low-temperature receiver water export, and 3 is the flow direction of condensate water).But the circulating cooling water flow of gigawatt nuclear power plant is large, and the pipeline specifications minimum of recirculating cooling water system is DN2800, and the butterfly valve buying of so large specification is very difficult, and purchase cost is very high, and the valve volume is larger, arranges also very difficultly, give to produce running and all brings inconvenience.
The utility model content
The technical problems to be solved in the utility model is, for defective of the prior art, provides nuclear power plant's recirculating cooling water system protecting water hammer device that a kind of cost is low, power consumption is few.
The technical scheme that its technical matters that solves the utility model adopts is: a kind of nuclear power plant recirculating cooling water system protecting water hammer device is provided, comprise the condenser and the siphon destructive valve that are arranged in the described recirculating cooling water system, be provided with the outlet hydroecium in the described condenser, described siphon destructive valve is arranged on the described outlet hydroecium;
Described nuclear power plant recirculating cooling water system protecting water hammer device comprises that also control when stopping transport for the water circulating pump in described recirculating cooling water system opens the joint control unit of described siphon destructive valve.
In nuclear power plant described in the utility model recirculating cooling water system protecting water hammer device, siphon destructive valve is arranged on the highest point of described outlet hydroecium.
In nuclear power plant described in the utility model recirculating cooling water system protecting water hammer device, described siphon destructive valve is provided with a plurality of valves parallel with one another.
In nuclear power plant described in the utility model recirculating cooling water system protecting water hammer device, described siphon destructive valve is siphon destructive diaphragm valve or vacuum butterfly valve.
In nuclear power plant described in the utility model recirculating cooling water system protecting water hammer device, be provided with the import hydroecium in the described condenser, described water circulating pump is communicated with described import hydroecium.
In nuclear power plant described in the utility model recirculating cooling water system protecting water hammer device, described condenser is arranged on the highest point of described recirculating cooling water system.
Nuclear power plant of the present utility model recirculating cooling water system protecting water hammer device has following beneficial effect: compare with traditional recirculating cooling water system protecting water hammer scheme, protecting water hammer scheme of the present utility model can reduce the cost of unit both ways, be minimizing equipment configuration when satisfying systemic-function on the one hand, reduce the engineering initial cost; Can reduce resistance to flow by butterfly valve on the cancellation pipeline on the other hand, reduce circulating pump head, the plant consumption of having saved water circulating pump.
Description of drawings
The utility model is described in further detail below in conjunction with drawings and Examples, in the accompanying drawing:
Fig. 1 is the system architecture diagram of recirculating cooling water system that is provided with the protecting water hammer scheme of prior art;
Fig. 2 is the system architecture diagram of protecting water hammer device of a kind of nuclear power plant recirculating cooling water system of the utility model preferred embodiment;
Fig. 3 is the theory diagram of protecting water hammer device of nuclear power plant's recirculating cooling water system of Fig. 2.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the utility model is further elaborated.Should be appreciated that specific embodiment described herein only in order to explaining the utility model, and be not used in restriction the utility model.
As Fig. 2, shown in Figure 3 be a kind of nuclear power plant recirculating cooling water system protecting water hammer device of the utility model preferred embodiment, comprise condenser 4 and siphon destructive valve 7, be provided with in the condenser 4 outlet hydroecium 402, siphon destructive valve 7 be arranged on the outlet hydroecium 402 on.Wherein, 1 is the low-temperature receiver flow inlet, and 2 is the low-temperature receiver water export, and 3 is the flow direction of condensate water, and low-temperature receiver current of the present utility model can be seawater, also can be the nuclear power recirculated cooling water take cooling tower as low-temperature receiver.Recirculating cooling water system in the utility model adopts the outlet hydroecium installation siphon destructive valve 7 at condenser 7 to carry out protecting water hammer.Siphon destructive valve is a kind of Special valve for preventing termination of pumping process generation negative pressure, and it is located at the pipeline bossing usually, and air amount when manifold pressure is lower than atmospheric pressure should guarantee that generally negative pressure is no more than 0.2bar in the pipeline.The characteristics such as this valve has simple structure, and cost is low, and is easy for installation.
During the system termination of pumping, if do not take the protecting water hammer measure, because the step-down in the starter system occurs, make this place's pressure decreased to pressure for vaporization, thereby the water column segregation phenomenon appears, progressively decay along with fluid inertia in the downstream pipeline section of recirculating cooling water system, under the pressure differential effect in the vaporization chamber of downstream end and siphon destructive valve, force in the pipeline section of downstream proal water column progressively to be converted into backward motion, the low pressure cavity reduces rapidly, last complete obiteration, and water column can produce and make up, when the water column after separating makes up again, the very high water hammer supercharging of making up will be produced.
The joint control unit 8 of siphon destructive valve 7 was opened in control when as shown in Figure 3, nuclear power plant's recirculating cooling water system protecting water hammer device also comprised for water circulating pump 5 stoppage in transit in recirculating cooling water system.The 8 pairs of water circulating pumps 5 in joint control unit are monitored, and it is air-breathing to open siphon destructive valve when water circulating pump 5 is stopped transport.Owing to the water column segregation phenomenon occurred soon after the recirculating cooling water system termination of pumping, must open immediately siphon destructive valve 7 air inlets after the termination of pumping with the pressure differential in the vaporization chamber of balance downstream end and siphon destructive valve, The faster the better for the opening time of valve; The external siphon destructive diaphragm valve opening time of producing is the fastest at present reaches 0.4 second, the barrier film valve opening time of domestic production is the fastest to reach 0.6 second, according to the numerical simulation of model as can be known, as long as reasonably choose valve aperture, 0.6 second valve of duration of valve opening also can be eliminated water hammer, and namely the siphon destructive diaphragm valve can be realized production domesticization.DN150 can only be accomplished owing to satisfy the diaphragm valve maximum caliber of time requirement simultaneously, therefore vacuum butterfly valve can be selected for through-flow bore greater than the valve of DN150.
Because siphon destructive valve 7 is opened the factor more complicated of the two-phase flow transient process impact of air inlet in the termination of pumping process, therefore adopt siphon destructive valve protection water hammer must adopt method of characteristic to carry out the numerical simulation of model, determine through-flow bore and the valve open time of siphon destructive valve, two-phase flow refers to the fluid system that two-phase fluid (have at least and be fluid) forms, so this non-this programme emphasis is not described further.
Siphon destructive valve 7 is arranged on the highest point of outlet hydroecium 402.Because the recirculating cooling water system flow of gigawatt nuclear power station is large, average discharge is about 60m
3/ s.Be provided with import hydroecium 401 in the condenser 4, water circulating pump 5 is communicated with import hydroecium 401, condenser 4 is preferably the highest point that is arranged on recirculating cooling water system in the whole recirculating cooling water system, and condenser 4 cope levels are higher than the siphonic water-collecting well water level elevation, thereby condenser 4 outlet hydroeciums 402 are minimum positions of pressure in the system when normal operation.
Further, siphon destructive valve 7 is provided with a plurality of valves parallel with one another.
Adopt nuclear power plant of the present utility model recirculating cooling water system protecting water hammer device to compare with traditional protecting water hammer technology, can reduce both ways generation and the operating cost of unit, be when satisfying systemic-function, to dispose by minimizing equipment on the one hand, reduce the engineering initial cost; SR be can reduce by valve on the cancellation pipeline on the other hand and circulating pump head and power, the plant consumption of having saved water circulating pump reduced.
In a specific embodiment, to adopting nuclear power plant of the present utility model recirculating cooling water system protecting water hammer device and traditional protecting water hammer technology to carry out qualitative assessment, see Table 1 from two aspects.
| Classification | Tradition butterfly valve scheme | Novel siphon destructive valve scheme |
| |
4 of DN2800 | Nothing |
| Diaphragm valve | Nothing | 6 of DN150 |
| Circulating pump head and power | 18 meters/6200KW | 16 meters/5500KW |
Two kinds of protecting water hammer schemes of table 1 support equipment relatively
Can find out that by contrast the maximum difference of two schemes equipment configuration is that protecting water hammer scheme of the present utility model has been cancelled the Large Electric butterfly valve.
According to design conditions and system requirements, with reference to the market price of each accessory in two schemes, system equipment initial cost economy relatively sees Table 2; System's year performance driving economy relatively sees Table 3.
Table 2 investment of equipment economy is (by 1 unit) relatively
Table 3 year performance driving economy is (by 1 unit) relatively
Illustrate: 1, benchmark refers to the required expense of general operating circulating water pump, and cooperates electric butterfly valve to use because the pump lift requirement is higher, so Billy is higher with the required expense of siphon destructive valve; 2, the unit operation time pressed 7000 hours/year, and the station-service electricity charge are calculated by 0.35 yuan/degree.
Can find out that from table 3, table 4 investment of equipment of every unit is saved 1,185 ten thousand yuan when adopting novel water hammer protectiving scheme, annual operating cost is saved 171.5 ten thousand yuan, and operation in 40 years can be saved 68,600,000 yuan.
Although the utility model describes by specific embodiment, it will be appreciated by those skilled in the art that, in the situation that does not break away from the utility model scope, can also carry out various conversion and be equal to alternative the utility model.In addition, for particular condition or material, can make various modifications to the utility model, and not break away from scope of the present utility model.Therefore, the utility model is not limited to disclosed specific embodiment, and should comprise the whole embodiments that fall in the utility model claim scope.
Claims (6)
1. nuclear power plant's recirculating cooling water system protecting water hammer device, it is characterized in that, comprise condenser (4) and siphon destructive valve (7), be provided with outlet hydroecium (402) in the described condenser (4), described siphon destructive valve (7) is arranged on the described outlet hydroecium (402);
Described nuclear power plant recirculating cooling water system protecting water hammer device also comprises the joint control unit (8) of opening described siphon destructive valve (7) for control when the water circulating pump (5) of described recirculating cooling water system is stopped transport.
2. nuclear power plant according to claim 1 recirculating cooling water system protecting water hammer device is characterized in that siphon destructive valve (7) is arranged on the highest point of described outlet hydroecium (402).
3. nuclear power plant according to claim 2 recirculating cooling water system protecting water hammer device is characterized in that described siphon destructive valve (7) is provided with a plurality of valves parallel with one another.
4. nuclear power plant according to claim 3 recirculating cooling water system protecting water hammer device is characterized in that described siphon destructive valve (7) is siphon destructive diaphragm valve or vacuum butterfly valve.
5. each described nuclear power plant recirculating cooling water system protecting water hammer device is characterized in that according to claim 1-4, and be provided with import hydroecium (401) in the described condenser (4), described water circulating pump (5) is communicated with described import hydroecium (401).
6. each described nuclear power plant recirculating cooling water system protecting water hammer device is characterized in that described condenser (4) is arranged on the highest point of described recirculating cooling water system according to claim 1-4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013202990952U CN203250541U (en) | 2013-05-28 | 2013-05-28 | Protector for water hammer of recirculated cooling water system in nuclear power plant |
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|---|---|---|---|
| CN2013202990952U CN203250541U (en) | 2013-05-28 | 2013-05-28 | Protector for water hammer of recirculated cooling water system in nuclear power plant |
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| CN203250541U true CN203250541U (en) | 2013-10-23 |
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| CN2013202990952U Expired - Lifetime CN203250541U (en) | 2013-05-28 | 2013-05-28 | Protector for water hammer of recirculated cooling water system in nuclear power plant |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606959A (en) * | 2021-05-10 | 2021-11-05 | 中国核电工程有限公司 | Condenser cooling system and power generation system |
-
2013
- 2013-05-28 CN CN2013202990952U patent/CN203250541U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113606959A (en) * | 2021-05-10 | 2021-11-05 | 中国核电工程有限公司 | Condenser cooling system and power generation system |
| CN113606959B (en) * | 2021-05-10 | 2024-04-12 | 中国核电工程有限公司 | Condenser cooling system and power generation system |
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| GR01 | Patent grant | ||
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Granted publication date: 20131023 |
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| CX01 | Expiry of patent term |