CN214330970U - Emergency shaft seal water injection device for important pump of nuclear power plant - Google Patents
Emergency shaft seal water injection device for important pump of nuclear power plant Download PDFInfo
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- CN214330970U CN214330970U CN202022384291.2U CN202022384291U CN214330970U CN 214330970 U CN214330970 U CN 214330970U CN 202022384291 U CN202022384291 U CN 202022384291U CN 214330970 U CN214330970 U CN 214330970U
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- shaft seal
- emergency shaft
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- 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
- Y02E30/30—Nuclear fission reactors
Abstract
The utility model provides an emergent bearing seal water injection device for important pump of nuclear power plant, including four circulating water pump, four important factory uses the emergent bearing seal isolating valve of water pump, the emergent bearing seal isolating valve of four circulating water pump, emergent shaft seal water mother pipe and house steward. The emergency shaft seal jellyfish pipe is connected with the important plant water pump through the important plant water pump emergency shaft seal isolating valve. The emergency shaft seal water main pipe is connected with the circulating water pump through a circulating water pump emergency shaft seal isolation valve. The main pipe of the emergency shaft seal water injection device for the important pump of the nuclear power plant is connected with a power station sewage system, a raw water system and a drinking water system; the emergency shaft seal water mother pipe of the emergency shaft seal water injection device for the important pump of the nuclear power plant is connected with a conventional island desalted water distribution system. The utility model discloses greatly improved the reliability level of circulating water pump and important factory water pump, eliminated the serious potential safety hazard that the unit exists.
Description
Technical Field
The utility model belongs to the technical field of the mechanical equipment of nuclear power plant, concretely relates to emergent bearing seal water injection device for important pump of nuclear power plant.
Background
Shaft seal water of the Fuqing nuclear power unit No. 1-4 circulating water pump and an important service water pump is normally provided by two water sources, namely a raw water system SEA and a drinking water system SEP. The isolation valves of the two water sources are in an open state in normal operation, and shaft seal water flowing into the circulating water pump and the important service water pump depends on the pressure of the SEA and the SEP system. Two water sources are converged into a main pipe at the inlet of the pump room and are responsible for supplying shaft seal water for a circulating water pump of a unit and an important service water pump. Because circulating water pump and important factory water pump lose the gland seal water and can not run for a long time, such design has following risk: 1) when the power of the fresh water plant is lost, the pumps of the SEP and the SEA system are completely stopped, and the normal shaft seal water injection is lost at the same time; 2) if the shaft seal water supply main pipe leaks, the circulating water pump and the important service water pump lose shaft seal water at the same time.
As a final cold source of a nuclear power station, important service water pumps and circulating water pumps are very important to operate safely and stably, and particularly important service water pumps are used. When the unit is shut down, the important service water pump still needs to continuously operate to discharge the waste heat of the reactor core and the heat of the spent fuel. If the shaft seal water is lost completely, the important plant water pump is damaged, the waste heat of the reactor core of the unit cannot be discharged, and the risk of melting the reactor core exists.
Based on the above-mentioned problem, an emergent bearing seal water injection device is urgently needed to be designed.
Disclosure of Invention
The utility model aims at providing an emergent bearing seal water injection device for important pump of nuclear power plant solves the circulating water pump of nuclear power plant and important mill and loses the hidden danger of normal bearing seal water with the water pump.
The utility model adopts the technical proposal that:
the utility model provides an emergent bearing seal water injection device for important pump of nuclear power plant, includes four circulating water pump, four important factory water pumps, four emergent bearing seal isolating valves of important factory water pump, four emergent bearing seal isolating valves of circulating water pump, emergent shaft seal water main pipe and house steward. The emergency shaft seal jellyfish pipe is connected with the important plant water pump through the important plant water pump emergency shaft seal isolating valve. The emergency shaft seal water main pipe is connected with the circulating water pump through a circulating water pump emergency shaft seal isolation valve. The main pipe of the emergency shaft seal water injection device for the important pump of the nuclear power plant is connected with a power station sewage system, a raw water system and a drinking water system; the emergency shaft seal water mother pipe of the emergency shaft seal water injection device for the important pump of the nuclear power plant is connected with a conventional island desalted water distribution system.
The emergency shaft seal water injection device for the nuclear power plant important pump is further provided with an emergency shaft seal pressure reducing valve, an emergency shaft seal isolating valve and an emergency shaft seal check valve.
One end of the emergency shaft seal pressure reducing valve is connected with the conventional island demineralized water distribution system, and the other end of the emergency shaft seal pressure reducing valve is sequentially connected with the emergency shaft seal isolating valve and the emergency shaft seal check valve through an emergency shaft seal jellyfish pipe.
The emergency shaft seal water injection device for the nuclear power plant important pump is further provided with a plurality of isolation valves and a plurality of check valves, and all the isolation valves and the check valves are made of 304L stainless steel. The plurality of check valves includes check valve a, check valve B, and check valve C. The number of isolations includes isolation valve J and isolation valve K.
One path of each important service water pump is connected with an emergency shaft seal check valve 3 through an emergency shaft seal isolation valve of the important service water pump and an emergency shaft seal main pipe.
The other path of each important service water pump is connected with the main pipe through an isolation valve and then is connected with one end of the check valve A. The other end of the check valve A is connected with a raw water system.
The raw water system is connected with the drinking water system through the check valve B, the isolation valve J, the check valve C and the isolation valve K in sequence.
The emergency shaft seal water main pipe is respectively connected with 4 emergency shaft seal isolating valves of the important service water pump and 4 emergency shaft seal isolating valves of the circulating water pump.
One path of each circulating water pump is connected with an emergency shaft seal jellyfish pipe through an emergency shaft seal isolating valve of the circulating water pump.
The other path of each circulating water pump is connected with the main pipe through an isolation valve.
The other end of the main pipe, which is far away from the raw water system, is connected with the power station sewage system through an isolation valve.
The four important emergency shaft seal isolation valves of the service water pump are all manual ball valves and are made of stainless steel 304L.
The four emergency shaft seal isolation valves of the circulating water pump are all manual ball valves and are made of stainless steel 304L.
The emergency shaft seal pipeline pressure reducing valve is a self-operated pressure regulating valve.
The pressure behind the emergency shaft seal reducing valve is stabilized at 0.4 MPa. When normal shaft seal water is lost, emergency shaft seal water is automatically put into use, and the circulating water pump and the important service water pump can safely, continuously and stably operate.
The shaft seal water of each important service water pump is 2.5-3.5L/m.
The shaft seal water of each circulating water pump is 0.2m3/h。
The utility model discloses the beneficial effect who gains does:
when normal shaft seal water of the circulating water pump and the important service water pump is lost, emergency shaft seal water injection can be automatically input without manual intervention, the reliability level of the circulating water pump and the important service water pump is greatly improved, and the serious potential safety hazard of a unit is eliminated.
Drawings
FIG. 1 is a schematic view of a demineralized water distribution system;
fig. 2 is a schematic diagram of an emergency shaft seal water injection device for a nuclear power plant critical pump.
Wherein: 1 is an emergency shaft seal pressure reducing valve; 2 is an emergency shaft seal isolating valve; 3 is an emergency shaft seal check valve; 4, a circulating water pump emergency shaft seal isolating valve A; 5, an emergency shaft seal isolation valve A of the important service water pump; 6, an emergency shaft seal isolation valve B of the important service water pump; 7 is a circulating water pump emergency shaft seal isolating valve B; 8 is a circulating water pump emergency shaft seal isolating valve C; 9 is an emergency shaft seal isolating valve C of the important service water pump; 10 is an emergency shaft seal isolation valve D of the important service water pump; 11 is a circulating water pump emergency shaft seal isolating valve D; 12 is an isolation valve A; 13 is an isolation valve B; 14 is an isolation valve C; 15 is an isolation valve D; 16 is an isolation valve E; 17 is an isolation valve F; 18 is an isolation valve G; 19 is an isolation valve H; 20 is an isolation valve I; 21 is a check valve A; 22 is a check valve B; 23 is an isolation valve J; 24 is a check valve C; and 25 is an isolation valve K.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-2, the utility model provides an emergent bearing seal water injection device for important pump of nuclear power plant, including four circulating water pump, four important factory use emergent bearing seal isolating valves of water pump, four emergent bearing seal isolating valves of circulating water pump, emergent shaft seal water mother pipe and house steward.
The emergency shaft seal jellyfish pipe is connected with the important plant water pump through the important plant water pump emergency shaft seal isolating valve. The emergency shaft seal water main pipe is connected with the circulating water pump through a circulating water pump emergency shaft seal isolation valve.
The main pipe of the emergency shaft seal water injection device for the important pump of the nuclear power plant is connected with a power station sewage system, a raw water system and a drinking water system; the emergency shaft seal water mother pipe of the emergency shaft seal water injection device for the important pump of the nuclear power plant is connected with a conventional island desalted water distribution system.
The emergency shaft seal water injection device for the nuclear power plant important pump is further provided with an emergency shaft seal pressure reducing valve 1, an emergency shaft seal isolating valve 2 and an emergency shaft seal check valve 3.
One end of the emergency shaft seal pressure reducing valve 1 is connected with the conventional island demineralized water distribution system, and the other end of the emergency shaft seal pressure reducing valve 1 is sequentially connected with the emergency shaft seal isolating valve 2 and the emergency shaft seal check valve 3 through an emergency shaft seal jellyfish pipe.
The emergency shaft seal water injection device for the nuclear power plant important pump is further provided with a plurality of isolation valves and a plurality of check valves, and all the isolation valves and the check valves are made of 304L stainless steel. The number of check valves includes check valve a21, check valve B22, and check valve C24. The number of isolations includes isolation valve J23 and isolation valve K25.
One path of each important service water pump is connected with an emergency shaft seal check valve 3 through an emergency shaft seal isolation valve of the important service water pump and an emergency shaft seal main pipe.
The other path of each important service water pump is connected with the main pipe through an isolation valve and then is connected with one end of a check valve A21. The other end of the check valve A21 is connected with the raw water system.
The raw water system is connected with the drinking water system through a check valve B22, an isolation valve J23, a check valve C24 and an isolation valve K25 in sequence.
The emergency shaft seal water main pipe is respectively connected with 4 emergency shaft seal isolating valves of the important service water pump and 4 emergency shaft seal isolating valves of the circulating water pump.
One path of each circulating water pump is connected with an emergency shaft seal jellyfish pipe through an emergency shaft seal isolating valve of the circulating water pump.
The other path of each circulating water pump is connected with the main pipe through an isolation valve.
The other end of the main pipe, which is far away from the raw water system, is connected with the power station sewage system through an isolation valve.
The four important emergency shaft seal isolation valves of the service water pump are all manual ball valves and are made of stainless steel 304L.
The four emergency shaft seal isolation valves of the circulating water pump are all manual ball valves and are made of stainless steel 304L.
The emergency shaft seal pipeline pressure reducing valve 1 is a self-operated pressure regulating valve.
The pressure behind the emergency shaft seal reducing valve is stabilized at 0.4 MPa. When normal shaft seal water is lost, emergency shaft seal water is automatically put into use, and the circulating water pump and the important service water pump can safely, continuously and stably operate.
The shaft seal water of each important service water pump is 2.5-3.5L/m.
The shaft seal water of each circulating water pump is 0.2m3H is used as the reference value. Under normal operating conditionsAnd starting 1-2 important plant water pumps of each unit, and starting 2 circulating water pumps. The maximum amount of shaft seal water of the two machine sets is 3.5x60x4/1000+0.2x4 is 1.64m3H is used as the reference value. The diameter of the emergency shaft seal water main pipe is DN25, and the emergency shaft seal water flow is 2.95m under the condition that the pressure difference is 0.4MPa3And h, the requirement of important plant water and circulating water pump shaft seal water flow of the two units under emergency can be met.
When the normal operation is carried out, the valve of the upstream conventional island demineralized water distribution system is opened, the pressure behind the valve is maintained at 0.4MPa, the drain valve of the header pipe is closed, and the valves at the pump room side are all opened, so that the emergency shaft seal water is in a standby state when the unit operates normally, and when the normal shaft seal water is lost, the emergency shaft seal water is automatically put into operation.
And newly adding system medium demineralized water, wherein the system design pressure is 1.05MPa.a, the system operation pressure is 0.9MPa.a, and the design temperature is normal temperature.
The utility model discloses a concrete construction method as follows:
an independent demineralized water pipeline is led out from the conventional island demineralized water distribution system, an independent demineralized water pipeline is led out from the drain valve of the main pipe, and the main pipe drain valve is additionally arranged at the downstream of the drain valve to be connected with a sewage system of a power plant under the condition of meeting the welding seam distance. And a tee joint is welded between the drain valve and the main pipe drain valve in a socket joint mode and is connected with a DN25 pipeline. And a pipeline between the drain valve and the main pipe drain valve is provided with a hole, and the size and the direction of the hole are required to meet the construction requirements. And a DN25 pipeline is welded at the opening, a flange is welded on the DN25 pipeline, and the emergency shaft seal pipeline pressure reducing valve 1 is installed.
Cutting a downstream pipeline of the isolation valve B13, welding a tee joint on the original pipeline, welding a DN20 pipeline at the tee joint, welding a valve mating flange, and installing a circulating pump emergency shaft seal water isolation valve D11.
Cutting a downstream pipeline of the isolation valve C14, welding a three-way joint on the original pipeline, welding a DN20 pipeline at the three-way joint, welding a valve mating flange, and installing an important factory water pump emergency shaft seal water isolation valve D10.
Cutting a downstream pipeline of the isolation valve D15, welding a tee joint on an original pipeline, welding a DN20 pipeline at the tee joint, welding a valve mating flange, and installing an important factory water pump emergency shaft seal water isolation valve C9.
Cutting off a downstream pipeline of the isolation valve E16, welding a tee joint on the original pipeline, welding a DN20 pipeline at the tee joint, welding a valve mating flange, and installing a circulating pump emergency shaft seal water isolation valve C8.
Cutting off a downstream pipeline of the isolation valve F17, welding a tee joint on an original pipeline, welding a DN20 pipeline at the tee joint, welding a valve mating flange, and installing a circulating pump emergency shaft seal water isolation valve B7.
Cutting a downstream pipeline of the isolation valve G18, welding a three-way joint on the original pipeline, welding a DN20 pipeline at the three-way joint, welding a valve mating flange, and installing an important factory water pump emergency shaft seal water isolation valve B6.
Cutting a downstream pipeline of the isolation valve H19, welding a tee joint on an original pipeline, welding a DN20 pipeline at the tee joint, welding a valve mating flange, and installing an important factory water pump emergency shaft seal water isolation valve A5.
Cutting a downstream pipeline of an isolation valve I20, welding a tee joint on an original pipeline, welding a DN20 pipeline at the tee joint, welding a valve mating flange, and installing a circulating pump emergency shaft seal water isolation valve A4.
Claims (10)
1. The utility model provides an emergent bearing seal water injection device for important pump of nuclear power plant which characterized in that: the system comprises four circulating water pumps, four important service water pump emergency shaft seal isolation valves, four circulating water pump emergency shaft seal isolation valves, an emergency shaft seal water main pipe and a main pipe; the emergency shaft seal water main pipe is respectively connected with each important service water pump through an important service water pump emergency shaft seal isolating valve; the emergency shaft seal water main pipe is respectively connected with each circulating water pump through a circulating water pump emergency shaft seal isolating valve; a main pipe of an emergency shaft seal water injection device for an important pump of a nuclear power plant is connected with a power station sewage system, a raw water system and a drinking water system; an emergency shaft seal water mother pipe of an emergency shaft seal water injection device for an important pump of a nuclear power plant is connected with a conventional island desalted water distribution system.
2. The emergency shaft seal water injection apparatus for a critical pump of a nuclear power plant as claimed in claim 1, wherein: the emergency shaft seal water injection device for the nuclear power plant important pump is further provided with an emergency shaft seal pressure reducing valve (1), an emergency shaft seal isolating valve (2) and an emergency shaft seal check valve (3).
3. The emergency shaft seal water injection apparatus for a critical pump of a nuclear power plant as claimed in claim 2, wherein: one end of the emergency shaft seal pressure reducing valve (1) is connected with the conventional island demineralized water distribution system, and the other end of the emergency shaft seal pressure reducing valve (1) is sequentially connected with the emergency shaft seal isolating valve (2) and the emergency shaft seal check valve (3) through an emergency shaft seal jellyfish pipe.
4. The emergency shaft seal water injection apparatus for a critical pump of a nuclear power plant as claimed in claim 3, wherein: the emergency shaft seal water injection device for the nuclear power plant important pump is also provided with a plurality of isolation valves and a plurality of check valves, and all the isolation valves and the check valves are made of 304L stainless steel; the plurality of check valves comprise a check valve A (21), a check valve B (22) and a check valve C (24); the number of isolations includes isolation valve J (23) and isolation valve K (25).
5. The emergency shaft seal water injection device for a critical pump of a nuclear power plant as claimed in claim 4, wherein: one path of each important service water pump is connected with an emergency shaft seal check valve (3) through an emergency shaft seal isolation valve of the important service water pump and an emergency shaft seal main pipe.
6. The emergency shaft seal water injection apparatus for a critical pump of a nuclear power plant as claimed in claim 5, wherein: the other path of each important service water pump is connected with one end of a check valve A (21) after being connected with the main pipe through an isolation valve, and the other end of the check valve A (21) is connected with a raw water system.
7. The emergency shaft seal water injection device for a critical pump of a nuclear power plant as claimed in claim 6, wherein: the raw water system is connected with the drinking water system through a check valve B (22), an isolation valve J (23), a check valve C (24) and an isolation valve K (25) in sequence.
8. The emergency shaft seal water injection apparatus for a critical pump of a nuclear power plant as claimed in claim 1, wherein: one path of each circulating water pump is connected with an emergency shaft seal jellyfish pipe through an emergency shaft seal isolating valve of the circulating water pump; the other path of each circulating water pump is connected with the main pipe through an isolation valve.
9. The emergency shaft seal water injection apparatus for a critical pump of a nuclear power plant as claimed in claim 1, wherein: the other end of the main pipe, which is far away from the raw water system, is connected with the power station sewage system through an isolation valve.
10. The emergency shaft seal water injection apparatus for a critical pump of a nuclear power plant as claimed in claim 1, wherein: the four important emergency shaft seal isolation valves of the service water pump and the four emergency shaft seal isolation valves of the circulating water pump are all manual ball valves and are made of 304L stainless steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022384291.2U CN214330970U (en) | 2020-10-23 | 2020-10-23 | Emergency shaft seal water injection device for important pump of nuclear power plant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022384291.2U CN214330970U (en) | 2020-10-23 | 2020-10-23 | Emergency shaft seal water injection device for important pump of nuclear power plant |
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| Publication Number | Publication Date |
|---|---|
| CN214330970U true CN214330970U (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022384291.2U Active CN214330970U (en) | 2020-10-23 | 2020-10-23 | Emergency shaft seal water injection device for important pump of nuclear power plant |
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| Country | Link |
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| CN (1) | CN214330970U (en) |
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2020
- 2020-10-23 CN CN202022384291.2U patent/CN214330970U/en active Active
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