CN110448844B - Method for synchronously replacing fire-fighting water isolation valves of peripheral plants of nuclear power station - Google Patents
Method for synchronously replacing fire-fighting water isolation valves of peripheral plants of nuclear power station Download PDFInfo
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- CN110448844B CN110448844B CN201910630502.5A CN201910630502A CN110448844B CN 110448844 B CN110448844 B CN 110448844B CN 201910630502 A CN201910630502 A CN 201910630502A CN 110448844 B CN110448844 B CN 110448844B
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Abstract
The invention relates to the technical field of a nuclear power station fire-fighting water production and distribution system, and provides a method for synchronously replacing a fire-fighting water isolation valve of a peripheral factory building in a nuclear power station, which comprises the following steps: connecting an external fire fighting pipe on an outlet connecting pipeline of the fire pump set with an external fire fighting head on a set of host fire fighting pipe network by using a main temporary pipeline; connecting at least one exhaust pipe from the host fire-fighting pipe network to the peripheral fire-fighting pipe network with a power station compressed air pipe; isolating each isolation valve from each host fire pipe network to the peripheral fire pipe network; replacing each isolation valve, and gradually releasing the isolation of each isolation valve; and (5) dismantling the main temporary pipeline. The method for synchronously replacing the fire-fighting water isolation valves of the peripheral factory buildings of the nuclear power station can quickly discharge water in pipelines from a host fire-fighting pipe network to the peripheral fire-fighting pipe network, thereby improving the replacement efficiency of each isolation valve on the pipelines, shortening the replacement time, ensuring the fire-fighting water of the host fire-fighting pipe network, ensuring the safe operation of a steam turbine set system and reducing the potential safety hazard.
Description
Technical Field
The invention belongs to the technical field of fire-fighting water production and distribution systems of nuclear power stations, and particularly relates to a method for synchronously replacing a fire-fighting water isolation valve of a peripheral factory building in a nuclear power station.
Background
The fuel used by the nuclear power station has higher danger; therefore, during operation of the nuclear power plant, good and stable maintenance and repair are required. A good fire protection system is needed to ensure good operation of the generator set and the corollary equipment of the nuclear power station and to cope with emergencies at any time, so as to ensure personnel safety. The early nuclear power plant generally includes two steam turbine set systems, a peripheral auxiliary system and an auxiliary supporting system corresponding to each steam turbine set system; each steam turbine set system comprises a steam turbine set, a main transformer and plant transformer room equipment and devices; the peripheral auxiliary system comprises an auxiliary transformer, a water replenishing system and other equipment and devices; the auxiliary supporting system generally comprises an auxiliary water supply system, a diesel engine, electrical equipment, a reactor system and other equipment and devices. Accordingly, the fire fighting system of the nuclear power plant needs to cover two steam turbine set systems, a peripheral auxiliary system, and an auxiliary support system. In addition, in order to increase security, a fire protection pipe network covering the peripheral auxiliary system is generally connected with nuclear power stations in other periods. Therefore, fire-fighting systems of nuclear power plants are very complex, have high design, manufacturing and management difficulties, and require a large amount of personnel to maintain so as to ensure the normal operation of the nuclear power plants. Before the nuclear power station fire-fighting pipe network system is implemented, namely design, simulation and verification, a large number of industry experts are concentrated to investigate, demonstrate and design, and generally carry out multiple times of stability simulation tests and emergency simulation tests, and then carry out strict processes such as verification, expert review and the like during design; each process before the implementation of the system is concentrated on the labor, the authentication and the examination of a large number of experts, so that the fire protection system of the nuclear power station can be implemented only after being designed, simulated and verified so as to ensure that the fire protection system can run timely and normally. This makes the fire fighting system of the nuclear power plant often adapt to use in the multi-phase nuclear power plant once designed and verified. The current nuclear power station fire-fighting system generally comprises two sets of fire-fighting water pump sets, a host fire-fighting pipe network covering each steam turbine set system, a matched fire-fighting pipe network covering each auxiliary matched system and a peripheral fire-fighting pipe network covering the peripheral auxiliary system. Fire water is delivered from the fire pump unit to the host fire-fighting pipe network and then is decompressed to the peripheral fire-fighting pipe network.
When the fire-fighting pipe network is normally used, the state of the valve in the pipe network can not be changed, namely the normally opened valve can be normally opened all the time, and the normally closed valve can be normally closed all the time, so that the problems of internal leakage and the like of the valve can not occur. However, when a certain nuclear power station is operated for a long time (up to 10 years), because the nuclear power station needs to maintain good fire protection, fire exercises can be frequently performed, and during the exercises, fire water area isolation is generally performed, namely, different plants are isolated in different areas, so that isolation valves on pipelines from a host fire pipe network to a peripheral fire pipe network need to be frequently opened and closed, and the isolation valves are prone to internal leakage relative to other valves in a nuclear power station fire pipe network system. When a plurality of isolating valves leak from a host fire fighting pipe network to a peripheral fire fighting pipe network, annual overhaul of equipment in a peripheral auxiliary system cannot be carried out. If the isolating valves need to be replaced, the diameter of the pipeline from the host fire-fighting pipe network to the peripheral fire-fighting pipe network is large, the pressure is high, the diameter is over 300mm generally, the pressure is 12bar, the pipeline is long, the water pressure in the pipeline needs to be released for ensuring safety, the drainage time of the drainage valve on the pipeline is too long, the host fire-fighting pipe network loses fire-fighting water for a long time, and the safety of a unit is seriously threatened.
Disclosure of Invention
The invention aims to provide a method for synchronously replacing fire-fighting water isolation valves of peripheral plants of a nuclear power station, which aims to solve the problems that in the prior art, after a host fire-fighting pipe network in a nuclear power station fire-fighting system leaks into a plurality of isolation valves on a peripheral fire-fighting pipe network, the replacement is difficult, and the unit safety is seriously threatened.
In order to achieve the purpose, the invention adopts the technical scheme that: the method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building in the nuclear power station comprises the following steps:
a preparation stage: connecting an external fire fighting pipe on an outlet connecting pipeline of the fire pump set with an external fire fighting head on a set of host fire fighting pipe network by using a main temporary pipeline; connecting at least one exhaust pipe from the host fire-fighting pipe network to the peripheral fire-fighting pipe network with a power station compressed air pipe;
block isolation: isolating each isolation valve from each host fire pipe network to the peripheral fire pipe network;
an operation stage: opening drain valves on drain pipes from the host fire fighting pipe network to the peripheral fire fighting pipe network, opening exhaust valves on the exhaust pipes and supplying compressed gas into the exhaust pipes until water in pipelines from the host fire fighting pipe network to the peripheral fire fighting pipe network is drained; replacing each isolation valve from the host fire-fighting pipe network to the peripheral fire-fighting pipe network;
and (3) a recovery stage: opening exhaust valves on at least one exhaust pipe from the host fire fighting pipe network to the peripheral fire fighting pipe network, and closing drain valves from the host fire fighting pipe network to the peripheral fire fighting pipe network; gradually releasing the isolation of each isolation valve from the host fire fighting pipe network to the peripheral fire fighting pipe network so as to fill water into the pipeline from the host fire fighting pipe network to the peripheral fire fighting pipe network and exhaust the water;
and (4) finishing the operation: and removing the main temporary pipeline and disconnecting the exhaust pipe from the power station compressed air pipe.
Further, the block isolation step specifically includes:
a first isolation block: closing valves from the host fire pipe networks to the peripheral fire pipe networks;
a second isolation block: closing valves from the fire pump set to the fire fighting pipe network of each host;
a third isolation block: and closing each isolation valve in the peripheral fire fighting pipe network before the peripheral fire fighting pipe network is connected to each host fire fighting pipe network.
Further, the recovery phase step further comprises:
gradually opening valves from the host fire fighting pipe networks to the peripheral fire fighting pipe networks to fill water into pipelines from the host fire fighting pipe networks to the peripheral fire fighting pipe networks and exhaust the water, closing the exhaust pipe when the water is discharged from the opened exhaust pipe, and then continuously opening the valves from the host fire fighting pipe networks to the peripheral fire fighting pipe networks until the water pressure in the pipelines from the host fire fighting pipe networks to the peripheral fire fighting pipe networks is consistent with the water pressure in the host fire fighting pipe networks.
Further, the preparation stage step further comprises the step of respectively connecting the host fire fighting pipe network to the plurality of exhaust pipes on the peripheral fire fighting pipe network with power station compressed air pipes.
Further, the preparation phase is followed by the steps of:
emergency response: the fire brigade quits in situ and lets a specially-assigned person carry out on-site inspection until the operation steps are finished;
and informing the fire brigade of removing the standby after the operation step is completed.
Further, the emergency response step further comprises the steps of: fire-fighting guarding: and informing the fire brigade to quit.
Further, the emergency response step further comprises the steps of:
operation warning: prohibiting the firing operation of the corresponding area of each steam turbine set system and the corresponding area of the peripheral auxiliary system;
and after the operation step is finished, the step of releasing the operation of prohibiting the firing of the corresponding area of each steam turbine set system and the corresponding area of the peripheral auxiliary system is also included.
Further, the preparation phase step further comprises: and arranging a protective guard at the joint of the main temporary pipeline and the external fire-fighting pipe, and arranging a protective guard at the joint of the main temporary pipeline and the external fire-fighting head.
Further, the step of completing the operation further comprises: the method further comprises the step of removing the guard rail before removing the main temporary pipeline.
Further, the preparation phase step further comprises: setting a temporary draining pump for draining water in the draining pit;
the step of completing the operation further comprises: and removing the temporary draining pump.
Further, the temporary drainage pump is arranged in an area corresponding to a pipeline from the host fire fighting pipe network to the peripheral fire fighting pipe network.
Furthermore, the temporary drainage pump is arranged at a position corresponding to each drainage pipe from the host fire fighting pipe network to the peripheral fire fighting pipe network.
Further, the preparation phase step further comprises the steps of:
time selection: and selecting a set of turboset for overhaul.
Further, the block isolation step further comprises the steps of:
stopping the overhaul machine: and (3) completing the complete reactor core unloading working condition of the steam turbine set to be overhauled, and stopping the main transformer corresponding to the steam turbine set.
Further, before the block isolating step, after the overhaul shutdown step, the method further comprises the following steps:
and (3) an emptying process: and (4) evacuating oil and hydrogen in the conventional island.
Further, the preparation stage step further comprises transporting a new valve to the place corresponding to the isolation valve to be replaced.
Further, the preparation stage step further includes the step of arranging a movable frame for respectively supporting each new valve, and enabling the height position of each flange hole on each new valve to be the same as the height position of each corresponding flange hole on the isolation valve to be replaced.
Further, the preparation stage step further comprises the steps of erecting a support frame at each isolation valve to be replaced, binding a rope on each isolation valve to be replaced, arranging a chain block on the support frame, and connecting a chain hook of the chain block with the rope.
Further, the completing step further comprises dismantling each of the support frames.
The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power station has the advantages that: compared with the prior art, the fire pump set has the advantages that the pipeline at the outlet of the fire pump set is connected with the fire pipe network of the host machine through the main temporary pipeline; therefore, after the host fire-fighting pipe network is isolated from each isolation valve on the peripheral fire-fighting pipe network, the host fire-fighting pipe network can be ensured to have fire-fighting water, so that the safe operation of the steam turbine set system is ensured, and the potential safety hazard is reduced; and through to sending to high-pressure gas in the blast pipe between the peripheral fire control pipe network to host computer fire control pipe network to drainage speed in this pipe network can realize accomplishing the drainage in half an hour, compares in the drainage time that needs nearly 20 hours at present, obtains shortening by a wide margin, greatly reduced the potential safety hazard, and then can change each isolation valve on the peripheral fire control pipe network to the host computer fire control pipe network.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed for the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for synchronously replacing a fire-fighting water isolation valve of a peripheral plant of a nuclear power plant according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a pipeline structure of a fire fighting system of a nuclear power plant according to an embodiment of the present invention.
Wherein, in the drawings, the reference numerals are mainly as follows:
11-fire pump set; 12-main water line; 121-zone isolation valves; 122-plant isolation valves; 13-a communication pipe; 131-a tie isolation valve; 14-external fire-fighting pipe; 141-external isolation valve;
20-a host fire-fighting pipe network; 21-a control valve; 22-a communication line; 221-a communication isolation valve; 23-connecting a fire-fighting head externally; 24-an exhaust pipe; 241-an exhaust valve;
30-peripheral fire-fighting pipe network; 31-a tap line; 311-split isolation valves; 32-a doubling line; 321-a doubling isolation valve; 33-a bypass line; 331-a bypass isolation valve; 34-a drain pipe; 341-a drain valve; 35-peripheral isolation valves;
40-matching fire-fighting pipe network; 41-auxiliary mating lines; 61-main temporary line.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. The meaning of "a number" is one or more unless specifically limited otherwise.
In the description of the present invention, it is to be understood that the terms "center", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1 and 2, a method for synchronously replacing a fire-fighting water isolation valve of a peripheral plant of a nuclear power plant according to the present invention will now be described. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building in the nuclear power station comprises the following steps:
preparation stage S1: the external fire fighting pipe 14 on the outlet connecting pipe 13 of the fire water pump set 11 is connected with the external fire fighting head 23 on the host fire fighting pipe network 20 by using the main temporary pipeline 61; connecting at least one exhaust pipe 24 from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 with a power station compressed air pipe;
block isolation S4: isolating each isolation valve from each host fire pipe network 20 to each peripheral fire pipe network 30;
operation stage S5: opening the drain valves 341 on the drain pipes 34 from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, opening the exhaust valves 241 on the exhaust pipes 24 and supplying compressed gas into the exhaust pipes 24 until the water in the pipelines from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 is drained; then replacing each isolation valve from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30;
recovery stage S6: opening an exhaust valve 241 on at least one exhaust pipe 24 from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, and closing each drain valve 341 from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30; gradually releasing the isolation of each isolation valve from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, so as to fill water into the pipelines from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 and exhaust the water;
completion job S7: the main temporary pipeline 61 is removed and the connection of the exhaust pipe 24 to the plant compressed air pipe is disconnected.
Through the above step of the preparation stage S1, the main temporary pipeline 61 can be connected in advance to reduce the time for replacing the isolation valve on the peripheral fire fighting pipe network 30, i.e. reduce the working time, and further reduce the risk. The external fire fighting pipe 14 on the outlet connecting pipe 13 of the fire water pump set 11 is connected with the external fire fighting head 23 on the host fire fighting pipe network 20 by using the main temporary pipeline 61; when the valve between the fire pump set 11 and the main fire-fighting pipe network 20 is closed, fire water can still be supplied to the main fire-fighting pipe network 20 through the fire pump set 11, so that the fire safety of equipment operation in the steam turbine set system is ensured. At least one exhaust pipe 24 from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 is connected to the power station compressed air pipe to facilitate the filling of compressed air into the pipes from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, so that water in the pipes from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 can be discharged more quickly in the operation stage S5.
Isolation valves between the host fire network 20 and the peripheral fire network 30 are isolated for replacement by block isolation S4.
In the above-mentioned step of recovering stage S6, because the pressure between the host fire protection pipe network 20 and the peripheral fire protection pipe network 30 is higher, generally about 12bar, the isolation of each isolation valve between the host fire protection pipe network 20 and the peripheral fire protection pipe network 30 is gradually released, so that the pressure of the pipeline between the host fire protection pipe network 20 and the peripheral fire protection pipe network 30 can be gradually recovered, the safety protection effect can be played, and the impact on the pipeline can be reduced. And at least one exhaust pipe 24 from the host fire protection pipe network 20 to the peripheral fire protection pipe network 30 is opened so as to rapidly exhaust gas in the pipe network from the host fire protection pipe network 20 to the peripheral fire protection pipe network 30.
Compared with the prior art, the method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building in the nuclear power station has the advantages that the pipeline at the outlet of the fire-fighting water pump set 11 is connected with the main fire-fighting pipe network 20 by using the main temporary pipeline 61, so that after isolating the isolation valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, can ensure that the fire-fighting pipe network 20 of the main machine has fire-fighting water so as to ensure the safe operation of the steam turbine set system, reduce the potential safety hazard, the high-pressure gas is sent to the exhaust pipe 24 on the pipe network between the host fire-fighting pipe network 20 and the peripheral fire-fighting pipe network 30 to accelerate the drainage speed of the pipe network between the host fire-fighting pipe network 20 and the peripheral fire-fighting pipe network 30, can realize the completion of water drainage within half an hour, greatly shortens the water drainage time which needs about 20 hours at present, greatly reduces the potential safety hazard, and then can change each isolation valve on host computer fire protection pipe network 20 to peripheral fire protection pipe network 30.
Further, referring to fig. 1 to 2, as a specific embodiment of the method for synchronously replacing the fire-fighting water isolation valves of the peripheral plants in the nuclear power plant provided by the present invention, the fire-fighting system of the nuclear power plant includes two sets of fire-fighting water pump units 11, a host fire-fighting pipe network 20 respectively covering each steam turbine unit system, a matching fire-fighting pipe network 40 respectively covering each auxiliary matching system, and a peripheral fire-fighting pipe network 30 covering the peripheral auxiliary system. The outlets of the two sets of fire pump sets 11 are respectively connected to two sets of host fire-fighting pipe networks 20 through main water pipelines 12. The two sets of main water pipelines 12 are connected in parallel through a connecting pipeline 13; the position that is close to each set of fire pump package 11 on the contact pipeline 13 is equipped with contact isolation valve 131 respectively, leaves external fire control pipe 14 between two contact isolation valves 131, is equipped with external isolation valve 141 on the external fire control pipe 14. Each main water line 12 is provided with an auxiliary mating line 41 extending to a corresponding mating fire-fighting pipe network 40. The two host fire-fighting pipe networks 20 are communicated through a communication pipeline 22, a communication isolation valve 221 is arranged on the communication pipeline 22, and an external fire-fighting head 23 is arranged on the communication isolation valve 221. A plant isolation valve 122 is provided on each main water line 12 before reaching the corresponding main fire fighting network 20, and a zone isolation valve 121 is provided on the main water line 12 before reaching the plant isolation valve 122. Branching pipelines 31 which are respectively communicated with a peripheral fire-fighting pipeline network 30 are led out from each set of host fire-fighting pipeline network 20, the two branching pipelines 31 are communicated through a parallel pipeline 32, parallel isolation valves 321 are respectively arranged at the positions, close to the branching pipelines 31, of the parallel pipelines 32, bypass pipelines 33 communicated with the peripheral fire-fighting pipeline network 30 are connected onto the parallel pipelines 32 between the two parallel isolation valves 321, and bypass isolation valves 331 are arranged on the bypass pipelines 33. A branch isolation valve 311 is also arranged before each branch pipeline 31 reaches the peripheral fire fighting network 30. A peripheral isolation valve 35 is arranged before the peripheral fire-fighting pipe network 30 is connected to each branching pipeline 31; the branch pipelines 31 are respectively provided with a drain pipe 34, and each drain pipe 34 is provided with a drain valve 341; the host fire-fighting pipe network 20 and the branch pipeline 31 are respectively provided with an exhaust pipe 24, and each exhaust pipe 24 is provided with an exhaust valve 241.
The preparation stage S1 is to connect the external fire hose 14 to the external fire hydrant 23 using the main temporary pipeline 61.
In this embodiment, the two parallel isolation valves 321 and the two branching isolation valves 311 need to be replaced at the same time. In other embodiments, when two or more of the two parallel isolation valves 321, the two branch isolation valves 311, and the two bypass isolation valves 331 leak and need to be replaced, the method for synchronously replacing the fire-fighting water isolation valves of the peripheral plants in the nuclear power plant of this embodiment may be used. Namely, the two parallel isolation valves 321, the two branching isolation valves 311 and the bypass isolation valve 331 are isolation valves from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30. The block isolation S4 is actually used to isolate these valves.
Further, referring to fig. 1 to 2, as an embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building in the nuclear power plant provided by the present invention, the block isolation S4 specifically includes:
first isolation block S41: closing valves in each host fire pipe network 20 to the peripheral fire pipe network 30;
second isolation block S42: closing the valves from the fire pump unit 11 to each of the host fire-fighting pipe networks 20;
third isolation block S43: closing each isolation valve in the peripheral fire fighting piping network 30 before connecting to each of the host fire fighting piping networks 20.
By the above-mentioned step of the first isolation block S41, the fire-fighting water in the host fire-fighting pipe network 20 is prevented from entering the peripheral fire-fighting pipe network 30. By the above-described step of the second isolation block S42, the fire protection water pump unit 11 is prevented from directly supplying fire protection water to the peripheral fire protection pipe network 30. By the third isolation block S43, water in the pipes from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 can be more quickly discharged by preventing the water in the peripheral fire fighting pipe network 30 from flowing back to the isolation valves.
Specifically, in the step of the first isolation block S41, each plant isolation valve 122 is actually closed. Preferably, the respective zone isolation valves 121 may be closed at the same time to improve the isolation effect. In the second isolation block S42, the control valve 21 in each set of the host fire-fighting network 20 to the corresponding branch line 31 is actually closed. In the third isolation block S43, the previous bypass isolation valve 331 and peripheral isolation valves 35 are actually closed. To isolate the two parallel isolation valves 321 and the two split isolation valves 311.
Further, referring to fig. 1 to fig. 2, as an embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant in the nuclear power plant provided by the present invention, the recovering step S6 further includes:
gradually opening the valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 to fill water and exhaust the water into the pipelines from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, closing the exhaust pipe 24 when the opened exhaust pipe 24 discharges the water, and then continuously opening the valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 until the water pressure in the pipelines from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 is consistent with the water pressure in the host fire fighting pipe network 20. To improve safety.
Further, referring to fig. 1 to 2, as a specific embodiment of the method for synchronously replacing the fire-fighting water isolation valves of the peripheral plants of the nuclear power plant provided by the present invention, in the recovery stage S6, specifically, the area isolation valve 121 is opened, one plant isolation valve 122 is then opened step by step, fire-fighting water is filled into the branch line 31 and the parallel line 32, and when water is discharged from the opened exhaust pipe 24, the exhaust pipe 24 is closed; the plant isolation valve 122 is opened again until the water pressure in the branch line 31 and the parallel line 32 is equal to the water pressure in the main water line 12. And then the control valve 21, the bypass isolation valve 331 and each peripheral isolation valve 35 from each set of host fire-fighting pipe network 20 to the corresponding branch pipeline 31 are opened.
Further, referring to fig. 1 to fig. 2, as a specific embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the preparation stage S1 further includes the following steps:
emergency response F2: the fire brigade quits in situ and lets the special person carry out the on-site inspection until the completion of the operation S7 step; through the setting of the emergency response F2 step, emergency fire fighting preparation can be made in advance, and fire fighting safety can be better guaranteed.
The step of completing operation S7 may be followed by a step of notifying the fire department to disarm the fire department. So that after the completion of the operation S7, emergency fire fighting is cancelled and the working strength of personnel is reduced.
Further, referring to fig. 1 to fig. 2, as an embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the emergency response F2 further includes the following steps before the step: fire fighting watch F11: and informing the fire brigade to quit. So as to prepare the fire brigade before the block isolation S4 step, thereby improving efficiency and reducing working time.
Further, referring to fig. 1 to fig. 2, as an embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the emergency response F2 further includes the following steps before the step:
job alert F12: prohibiting the firing operation of the corresponding area of each steam turbine set system and the corresponding area of the peripheral auxiliary system; to reduce safety risks during the operation of replacing the isolation valve.
The step S7 of completing the operation further includes a step of releasing the operation of prohibiting the firing of the area corresponding to each turbine block system and the area corresponding to the peripheral auxiliary system. So that the normal work and work of the worker can be resumed after the completion of the work S7.
Further, referring to fig. 1 to fig. 2, as a specific implementation of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant in the nuclear power plant provided by the present invention, the preparation step S1 further includes: a guard rail is arranged at the joint of the main temporary pipeline 61 and the external fire fighting pipe 14, and a guard rail is arranged at the joint of the main temporary pipeline 61 and the external fire fighting head 23. The protective guard is arranged to better remind and protect, and hidden dangers are reduced.
Further, referring to fig. 1 to fig. 2, as a specific implementation of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the step of completing S7 further includes: the method further comprises the step of removing the guard rail before removing the main temporary pipeline 61. So as to facilitate the subsequent operation and the normal operation.
Further, referring to fig. 1 to fig. 2, as a specific implementation of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant in the nuclear power plant provided by the present invention, the preparation step S1 further includes: setting a temporary draining pump for draining water in the draining pit;
the step of completing the job S7 further includes: and removing the temporary draining pump.
Because when changing the isolation valve on host computer fire control pipe network 20 to peripheral fire control pipe network 30, need discharge the fire water in the corresponding pipeline, and set up interim drain pump, drainage that can be faster improves security and operating efficiency.
Further, referring to fig. 1 to 2, as a specific embodiment of the method for synchronously replacing the fire-fighting water isolation valves of the peripheral plant in the nuclear power plant provided by the present invention, the temporary drainage pump is disposed in an area corresponding to a pipeline from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30. So as to drain water more quickly and improve efficiency.
Further, referring to fig. 1 to 2, as a specific embodiment of the method for synchronously replacing the fire-fighting water isolation valves of the peripheral plant in the nuclear power plant according to the present invention, the temporary drainage pump is disposed at a position corresponding to each drainage pipe 34 from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30, so as to drain water more quickly, improve efficiency, and shorten drainage time.
Further, referring to fig. 1 to fig. 2, as a specific implementation of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant in the nuclear power plant provided by the present invention, the step of the preparation stage S1 further includes the following steps:
time selection S0: and selecting a set of turboset for overhaul. The time for overhauling a steam turbine set is selected, and the steam turbine set, the corresponding nuclear island, the main transformer and the auxiliary equipment stop working during overhauling, so that the influence on the steam turbine set can be reduced, and the safety risk is reduced.
Further, referring to fig. 1 to fig. 2, as an embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the step of block isolation S4 further includes the following steps:
overhaul shutdown S2: and (3) completing the complete reactor core unloading working condition of the steam turbine set to be overhauled, and stopping the main transformer corresponding to the steam turbine set. The safety risk can be further reduced by the step of overhaul shutdown S2.
Further, referring to fig. 1 to 2, as an embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the method further includes the steps before the step of isolating the block S4 and after the step of stopping the overhaul machine S2:
evacuation process S3: and (4) evacuating oil and hydrogen in the conventional island.
The fire risk can be reduced by 50% by the above-described evacuation process S3, and safety can be improved.
Further, referring to fig. 1 to 2, as a specific implementation manner of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the invention, the step of the preparation stage S1 further includes conveying a new valve to a position corresponding to the isolation valve to be replaced, so that after the isolation valve to be replaced is disassembled, the new valve can be installed as soon as possible, the time for replacing the valve is shortened, the efficiency is improved, and the safety risk is reduced.
Further, referring to fig. 1 to 2, as a specific implementation manner of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the preparation step S1 further includes setting a movable frame for respectively supporting each new valve, and making the height position of each flange hole on each new valve be the same as the height position of each corresponding flange hole on the isolation valve to be replaced. Because new valve weight is heavier, uses the removal frame to remove, can reduce personnel intensity of labour to can install more fast on the pipeline, raise the efficiency shortens and changes the valve time, reduces the safety risk.
Further, referring to fig. 1 to 2, as a specific implementation manner of the method for synchronously replacing the fire-fighting water isolation valves of the peripheral plant of the nuclear power plant provided by the present invention, the preparation step S1 further includes setting a support frame at each isolation valve to be replaced, binding a rope on each isolation valve to be replaced, setting a chain block on the support frame, and connecting a chain hook of the chain block with the rope. Because the isolating valve of waiting to change is heavier, and the isolating valve of waiting to change is fixed more firm, and sets up support frame and chain block, convenient when dismantling the isolating valve of waiting to change, not hard up the isolating valve of waiting to change to after dismantling, put aside this isolating valve, the new valve of easy to assemble, with raise the efficiency, shorten and change the valve time, reduce the safety risk.
Further, referring to fig. 1 to 2, as an embodiment of the method for synchronously replacing the fire-fighting water isolation valve of the peripheral plant of the nuclear power plant provided by the present invention, the completing step S7 further includes dismantling each support frame to operate the valve at a later stage.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (16)
1. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building in the nuclear power station is characterized by comprising the following steps of: the method comprises the following steps:
a preparation stage: connecting an external fire fighting pipe on an outlet connecting pipeline of the fire pump set with an external fire fighting head on a set of host fire fighting pipe network by using a main temporary pipeline; connecting at least one exhaust pipe from the host fire fighting pipe network to a peripheral fire fighting pipe network with a power station compressed air pipe so as to charge compressed air into pipelines from the host fire fighting pipe network to the peripheral fire fighting pipe network;
block isolation: isolating each isolation valve from each host fire pipe network to the peripheral fire pipe network;
an operation stage: opening drain valves on drain pipes from the host fire fighting pipe network to the peripheral fire fighting pipe network, opening exhaust valves on the exhaust pipes and supplying compressed gas into the exhaust pipes until water in pipelines from the host fire fighting pipe network to the peripheral fire fighting pipe network is drained; replacing each isolation valve from the host fire-fighting pipe network to the peripheral fire-fighting pipe network;
and (3) a recovery stage: opening exhaust valves on at least one exhaust pipe from the host fire fighting pipe network to the peripheral fire fighting pipe network, and closing drain valves from the host fire fighting pipe network to the peripheral fire fighting pipe network; gradually releasing the isolation of each isolation valve from the host fire fighting pipe network to the peripheral fire fighting pipe network so as to fill water into the pipeline from the host fire fighting pipe network to the peripheral fire fighting pipe network and exhaust the water;
and (4) finishing the operation: removing the main temporary pipeline and disconnecting the exhaust pipe from the power station compressed air pipe;
the block isolation step specifically includes:
a first isolation block: closing valves from the host fire pipe networks to the peripheral fire pipe networks;
a second isolation block: closing valves from the fire pump set to the fire fighting pipe network of each host;
a third isolation block: closing each isolation valve in the peripheral fire fighting pipe network before being connected to each host fire fighting pipe network;
the recovery phase step further comprises: gradually opening valves from the host fire fighting pipe networks to the peripheral fire fighting pipe networks to fill water into pipelines from the host fire fighting pipe networks to the peripheral fire fighting pipe networks and exhaust the water, closing the exhaust pipe when the water is discharged from the opened exhaust pipe, and then continuously opening the valves from the host fire fighting pipe networks to the peripheral fire fighting pipe networks until the water pressure in the pipelines from the host fire fighting pipe networks to the peripheral fire fighting pipe networks is consistent with the water pressure in the host fire fighting pipe networks;
the preparation phase step further comprises: and respectively connecting the host fire-fighting pipe network to the plurality of exhaust pipes on the peripheral fire-fighting pipe network with power station compressed air pipes.
2. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 1, wherein: the preparation phase is followed by the steps of:
emergency response: the fire brigade quits in situ and lets a specially-assigned person carry out on-site inspection until the operation steps are finished;
and informing the fire brigade of removing the standby after the operation step is completed.
3. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 2, wherein: the emergency response step further comprises the following steps of: fire-fighting guarding: and informing the fire brigade to quit.
4. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 2, wherein: the emergency response step further comprises the following steps of:
operation warning: prohibiting the firing operation of the corresponding area of each steam turbine set system and the corresponding area of the peripheral auxiliary system;
and after the operation step is finished, the step of releasing the operation of prohibiting the firing of the corresponding area of each steam turbine set system and the corresponding area of the peripheral auxiliary system is also included.
5. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 1, wherein: the preparation phase step further comprises: and arranging a protective guard at the joint of the main temporary pipeline and the external fire-fighting pipe, and arranging a protective guard at the joint of the main temporary pipeline and the external fire-fighting head.
6. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 5, wherein the method comprises the following steps: the step of completing the operation further comprises: the method further comprises the step of removing the guard rail before removing the main temporary pipeline.
7. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 1, wherein: the preparation phase step further comprises: setting a temporary draining pump for draining water in the draining pit;
the step of completing the operation further comprises: and removing the temporary draining pump.
8. The method for synchronously replacing the fire-fighting water isolation valves of the peripheral buildings of the nuclear power plant as claimed in claim 7, wherein the method comprises the following steps: the temporary drainage pump is arranged in an area corresponding to a pipeline from the host fire fighting pipe network to the peripheral fire fighting pipe network.
9. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as recited in claim 8, wherein: the temporary drainage pump is arranged at the position corresponding to each drainage pipe from the host fire-fighting pipe network to the peripheral fire-fighting pipe network.
10. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 1, wherein: the preparation phase step further comprises the steps of:
time selection: and selecting a set of turboset for overhaul.
11. The method for synchronously replacing the fire-fighting water isolation valves of the peripheral buildings of the nuclear power plant as claimed in claim 10, wherein the method comprises the following steps: the block isolation step further comprises the following steps:
stopping the overhaul machine: and (3) completing the complete reactor core unloading working condition of the steam turbine set to be overhauled, and stopping the main transformer corresponding to the steam turbine set.
12. The method for synchronously replacing the fire-fighting water isolation valves of the peripheral buildings of the nuclear power plant as claimed in claim 11, wherein the method comprises the following steps: before the block isolation step, after the overhaul shutdown step, the method further comprises the following steps:
and (3) an emptying process: and (4) evacuating oil and hydrogen in the conventional island.
13. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 1, wherein: the preparatory phase step also includes transporting a new valve to the location corresponding to the isolation valve to be replaced.
14. The method for synchronously replacing the fire-fighting water isolation valves of the peripheral buildings of the nuclear power plant as claimed in claim 13, wherein the method comprises the following steps: the preparation stage step further comprises the step of arranging a movable frame for respectively supporting the new valves, and enabling the height positions of the flange holes on the new valves to be the same as the height positions of the corresponding flange holes on the isolation valve to be replaced.
15. The method for synchronously replacing the fire-fighting water isolation valve of the peripheral factory building of the nuclear power plant as claimed in claim 1, wherein: the preparation stage step further comprises the steps of erecting a support frame at each isolation valve to be replaced, binding a rope on each isolation valve to be replaced, arranging a chain block on the support frame, and connecting a chain lifting hook of the chain block with the rope.
16. The method for synchronously replacing the fire-fighting water isolation valves of the peripheral buildings of the nuclear power plant as claimed in claim 15, wherein the method comprises the following steps: and the completion operation also comprises the dismantling of each support frame.
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| JP2003270374A (en) * | 2002-03-19 | 2003-09-25 | Hitachi Ltd | Containment spray control device |
| CN201741415U (en) * | 2010-07-30 | 2011-02-09 | 中广核工程有限公司 | Emergency water compensation device |
| CN103165012B (en) * | 2011-12-14 | 2015-10-28 | 中国广核集团有限公司 | A kind of trainer of nuclear power station main steam isolation valve control system and method |
| CN103778978B (en) * | 2012-10-25 | 2016-08-10 | 中国核动力研究设计院 | Integral reactor main pump drainage for overhaul and Residual heat removal method |
| CN103915124B (en) * | 2013-10-18 | 2016-08-17 | 中广核核电运营有限公司 | Nuclear power station conventional island demineralized water distribution system full cut-off repair method |
| CN204034106U (en) * | 2014-07-24 | 2014-12-24 | 广西防城港核电有限公司 | Nuclear power station fire water distribution system |
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