CN110170121B

CN110170121B - Nuclear power station fire-fighting pipe network system and nuclear power station fire-fighting pipe network online optimization method

Info

Publication number: CN110170121B
Application number: CN201910307144.4A
Authority: CN
Inventors: 王远国; 李云臣; 周利锋; 俞海兵; 徐立华
Original assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Daya Bay Nuclear Power Operations and Management Co Ltd; Lingdong Nuclear Power Co Ltd; Guangdong Nuclear Power Joint Venture Co Ltd; Lingao Nuclear Power Co Ltd
Current assignee: China General Nuclear Power Corp; CGN Power Co Ltd; Daya Bay Nuclear Power Operations and Management Co Ltd; Lingdong Nuclear Power Co Ltd; Guangdong Nuclear Power Joint Venture Co Ltd; Lingao Nuclear Power Co Ltd
Priority date: 2019-04-17
Filing date: 2019-04-17
Publication date: 2021-05-07
Anticipated expiration: 2039-04-17
Also published as: CN110170121A

Abstract

The invention relates to the technical field of production and distribution systems of fire-fighting water of nuclear power stations, and provides a fire-fighting pipe network system of a nuclear power station and an online optimization method of the fire-fighting pipe network of the nuclear power station, wherein the method comprises the following steps: selecting a section of communicating pipeline on the branching pipeline, prefabricating a replacing pipeline with the same size as the communicating pipeline, and arranging an isolating valve on the replacing pipeline; 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 an external pipeline on the peripheral fire-fighting pipe network with a high-level reservoir water supply pipe network in the nuclear power plant by using an auxiliary temporary pipeline; isolating the communication pipeline, replacing the communication pipeline with a replacement pipeline, and releasing the isolation and recovering. The method for optimizing the nuclear power station fire-fighting pipe network on line can optimize the nuclear power station fire-fighting pipe network on line, increase the isolating valve and ensure that the host fire-fighting pipe network and the peripheral fire-fighting pipe network have fire-fighting water so as to ensure the safe operation of the steam turbine set system and the peripheral auxiliary system.

Description

Nuclear power station fire-fighting pipe network system and nuclear power station fire-fighting pipe network online optimization method

Technical Field

The invention belongs to the technical field of production and distribution systems of fire-fighting water of nuclear power stations, and particularly relates to a fire-fighting pipe network system of a nuclear power station and an online optimization method of the fire-fighting pipe network of the 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. And the fire extinguishing system of the nuclear power station is generally constructed through a large amount of manpower, multiple times of stability simulation tests and emergency simulation tests so as to ensure that the fire extinguishing system can run normally in time and is applied to the nuclear power station. 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. Thus, once the design of the fire protection system of the nuclear power plant is complete, no optimization is generally required.

The current nuclear power station fire-fighting pipe network 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. However, in the fire-fighting system of the nuclear power station, for example, in the operation process of a certain nuclear power station, the host fire-fighting pipe network leaks into some isolation valves on the peripheral fire-fighting pipe network, so that annual overhaul of equipment in the peripheral auxiliary system cannot be carried out, and if the normal annual overhaul or replacement of the isolation valves is needed, the host fire-fighting pipe network loses fire-fighting water and seriously threatens the safety of a unit.

Disclosure of Invention

The invention aims to provide an online optimization method for a nuclear power station fire-fighting pipe network, which aims to solve the problems that in the prior art, after valves from a host fire-fighting pipe network to a peripheral fire-fighting pipe network leak inwards, the valves are difficult to replace, and the safety of a unit is seriously threatened.

In order to achieve the purpose, the invention adopts the technical scheme that: the method for optimizing the fire-fighting pipe network of the nuclear power station on line comprises the following steps:

a prefabrication stage: selecting a section of communicating pipeline which is close to the corresponding host fire fighting pipe network position on a branch pipeline for connecting each set of host fire fighting pipe network to the peripheral fire fighting pipe network, wherein flanges are respectively arranged at two ends of the communicating pipeline, and then detecting the size of the communicating pipeline; prefabricating a replacement pipeline with the same size as the communication pipeline according to the size of the communication pipeline, wherein the replacement pipeline is provided with a closing valve;

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 an external pipeline on the peripheral fire-fighting pipe network with a high-level reservoir water supply pipe network in the nuclear power plant by using an auxiliary temporary pipeline;

block isolation: closing valves from the host fire fighting pipe network to the peripheral fire fighting pipe network;

an operation stage: replacing each of the communication lines with the replacement line;

and (3) a recovery stage: gradually opening valves connected to the peripheral fire fighting pipe network in the host fire fighting pipe network, and then opening valves from the host fire fighting pipe network to the peripheral fire fighting pipe network so as to fill water and exhaust gas in pipelines from the host fire fighting pipe network to the peripheral fire fighting pipe network;

and (4) finishing the operation: and removing the main temporary pipeline and the auxiliary temporary pipeline.

Further, the method for optimizing the fire-fighting pipe network of the nuclear power station on line further comprises the following steps:

a detection stage: detecting whether each isolation valve from the host fire-fighting pipe network to the peripheral fire-fighting pipe network leaks inwards; if yes, the block isolation step is carried out; if not, the following steps are carried out:

pipeline isolation: closing valves from the host fire fighting pipe networks to the peripheral fire fighting pipe network, closing valves from the fire fighting water pump group to the host fire fighting pipe networks, and closing isolation valves from the host fire fighting pipe networks to the peripheral fire fighting pipe network; then, the above-mentioned working stage steps are carried out.

Further, in the step of the detection stage, if the internal leakage of each isolation valve from the host fire fighting pipe network to the peripheral fire fighting pipe network is detected, the operation stage further comprises a step of replacing each isolation valve.

Further, in the step of the detection stage, if the host fire fighting pipe network is detected to leak into each isolation valve on the peripheral fire fighting pipe network, the recovery stage further includes closing the isolation valve, gradually opening each valve connected to the branch line pipeline in the host fire fighting pipe network, and then opening each valve connected to each host fire fighting pipe network by the fire fighting water pump; and then each isolation valve is replaced, the isolating valves are opened step by step, and the branch pipelines are opened step by step to each valve on the peripheral fire fighting pipe network.

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 the isolation valve after each host fire-fighting pipe network reaches each pressure reducing valve on the peripheral fire-fighting pipe network.

Further, the block isolating step further comprises:

a fourth isolation block: and closing valves from the fire-fighting pipe network of the auxiliary transformer plant to each pressure reducing valve in the nuclear power station fire-fighting pipe network system.

Further, the block isolating step further comprises:

a fifth isolation block: the valves on the fire lines connecting the other phase nuclear power plants to the phase nuclear power plant are closed.

Further, the recovery phase step further comprises:

and gradually opening valves from the host fire fighting pipe network to the peripheral fire fighting pipe network to fill water into the pipelines from the host fire fighting pipe network to the peripheral fire fighting pipe network and exhaust the water until the water pressure in the pipelines from the host fire fighting pipe network to the peripheral fire fighting pipe network is consistent with the water pressure in the host fire fighting pipe network.

Furthermore, each replacement pipeline also comprises two connecting pipelines which are respectively used for connecting with two ends of the isolating valve;

the operation stage step further includes disassembling each of the communication pipelines, installing two connection pipes of each of the replacement pipelines in the corresponding branch pipelines, respectively, and connecting both ends of each of the block valves to the two connection pipes.

Furthermore, each replacement pipeline also comprises two connecting pipelines which are respectively used for connecting with two ends of the isolating valve; the prefabricating stage step also comprises the step of respectively connecting the two connecting pipelines with two ends of the isolating valve;

the service stage step further includes disassembling each of the communication lines and connecting each of the replacement lines to the corresponding branch line.

Further, the prefabrication stage step further comprises the step of arranging a bracket to support each replacement pipeline on the side of the corresponding communication pipeline.

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 the area corresponding to the communication pipeline.

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.

The method for optimizing the fire-fighting pipe network of the nuclear power station on line has the beneficial effects that: compared with the prior art, the replacement pipeline with the isolating valve is prefabricated, the pipeline at the outlet of the fire pump set is connected with the host fire-fighting pipe network by using the main temporary pipeline, and the external pipeline on the peripheral fire-fighting pipe network is connected with the high-level reservoir water supply pipe network in the nuclear power station by using the auxiliary temporary pipeline; thereby after each valve with host computer fire control pipe network to peripheral fire control pipe network is closed, can guarantee that host computer fire control pipe network and peripheral fire control pipe network have fire water, in order to guarantee steam turbine unit system and peripheral auxiliary system safe operation, reduce the potential safety hazard, and then increase the block valve on each branch line, in order to guarantee that the interior of each isolation valve of sequent host computer fire control pipe network to peripheral fire control pipe network leaks, only need close the block valve can, need not to close each valve on host computer fire control pipe network and fire water pump group pipeline to host computer fire control pipe network, and not only convenient operation, and assurance steam turbine unit system safe operation that can be better.

The invention also aims to provide a nuclear power station fire-fighting pipe network system which comprises two sets of fire-fighting water pump sets, a host fire-fighting pipe network respectively covering each steam turbine set system, a matched fire-fighting pipe network respectively covering each auxiliary matched system and a peripheral fire-fighting pipe network covering the peripheral auxiliary systems; outlets of the two sets of fire pump groups are respectively connected to the two sets of host fire-fighting pipe networks through main water pipelines; the two main water pipelines are connected in parallel through a connecting pipeline; the positions, close to the fire pump sets, of the communication pipelines are respectively provided with a communication isolation valve, an external fire fighting pipe is reserved between the two communication isolation valves, and the external fire fighting pipe is provided with an external isolation valve; each main water pipeline is provided with an auxiliary matched pipeline which extends to the corresponding matched fire-fighting pipe network, and each auxiliary matched pipeline is provided with a matched pipeline isolation valve; the two host fire-fighting pipe networks are communicated through a communication pipeline, a communication isolation valve is arranged on the communication pipeline, and an external fire-fighting head is arranged on the communication isolation valve; a plant isolation valve is arranged at a position on each main water pipeline before reaching the corresponding host fire-fighting pipe network, and an area isolation valve is arranged at a position on each main water pipeline before reaching the plant isolation valve; branching pipelines which are respectively communicated with the peripheral fire fighting pipe network are led out from each set of host fire fighting pipe network, the two branching pipelines are communicated through a parallel pipeline, parallel isolation valves are respectively arranged at the positions, close to the respective branching pipelines, of the parallel pipelines, a bypass pressure division pipeline communicated with the peripheral fire fighting pipe network is connected onto the parallel pipeline between the two parallel isolation valves, a bypass pressure reducing valve is arranged on the bypass pressure division pipeline, a bypass postposition isolation valve is arranged behind the bypass pressure reducing valve, a bypass filter is arranged in front of the bypass pressure reducing valve, and a bypass preposition isolation valve is arranged in front of the bypass filter; a branching pressure reducing valve is arranged on each branching pipeline before the peripheral fire fighting pipe network, a branching post-isolation valve is arranged behind the branching pressure reducing valve, a branching filter is arranged in front of the branching pressure reducing valve, and a branching pre-isolation valve is arranged in front of the branching filter; an external pipeline is arranged on the peripheral fire-fighting pipe network; and a section of each branch pipeline close to the corresponding host fire-fighting pipe network is provided with a closing valve.

The nuclear power station fire-fighting pipe network system provided by the invention has the beneficial effects that: compared with the prior art, the nuclear power station fire-fighting pipe network system disclosed by the invention has the advantages that when the main engine fire-fighting pipe network leaks into the isolation valves on the peripheral fire-fighting pipe network, only the isolation valves need to be closed, and valves in the main engine fire-fighting pipe network and valves in pipelines from the fire-fighting water pump set to the main engine fire-fighting pipe network do not need to be closed, so that the operation is convenient, and the safe operation of the steam turbine set system can be better ensured.

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 diagram of a fire protection pipe network system of a nuclear power plant in the prior art.

Fig. 2 is a schematic diagram of a process of online optimization of a nuclear power plant fire protection pipe network system according to an embodiment of the present invention.

Fig. 3 is a schematic flow chart of a method for online optimization of a nuclear power plant fire pipe network according to an embodiment of the present invention.

Fig. 4 is a schematic flow chart of a method for online optimization of a nuclear power plant fire pipe network according to a second embodiment of the present invention.

Fig. 5 is a schematic flow chart of a method for online optimization of a fire pipe network of a nuclear power plant according to a third embodiment of the present invention.

Fig. 6 is a schematic flow chart of a method for online optimization of a fire pipe network of a nuclear power plant according to a third 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;

30-peripheral fire-fighting pipe network; 31-a tap line; 311-split pressure relief valves; 312-a branching filter; 313-branching post-isolation valves; 314-split pre-isolation valve; 32-a doubling line; 321-a doubling isolation valve; 33-a bypass partial pressure line; 331-a bypass pressure reducing valve; 332-a bypass filter; 333-bypass post-isolation valve; 334-bypass pre-isolation valve; 34-connecting lines; 35-other phase nuclear power plant; 36-auxiliary transformer plant fire-fighting pipe network; 37-external pipeline; 38-a communication line; 381-flange;

40-matching fire-fighting pipe network; 41-auxiliary mating lines; 42-mating line isolation valve; 50-a high reservoir water supply pipe network in the nuclear power station; 61-main temporary line; 62-auxiliary temporary lines; 71-replacement of the pipeline; 72-block valve.

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.

The first embodiment is as follows:

referring to fig. 1 to fig. 3, a description will now be given of an online optimization method for a nuclear power plant fire protection pipe network according to the present invention. The method for optimizing the fire-fighting pipe network of the nuclear power station on line comprises the following steps:

prefabrication stage F0: selecting a section of communication pipeline 38 on a branch pipeline 31 of each set of host fire-fighting pipeline network 20 connected to a peripheral fire-fighting pipeline network 30, which is close to the corresponding host fire-fighting pipeline network 20, wherein flanges 381 are respectively arranged at two ends of the communication pipeline 38, and then detecting the size of the communication pipeline 38; a replacement pipeline 71 with the same size as the communication pipeline 38 is prefabricated according to the size of the communication pipeline 38, and a blocking valve 72 is arranged on the replacement pipeline 71;

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; an auxiliary temporary pipeline 62 is used for connecting an external pipeline 37 on the peripheral fire fighting pipe network 30 with a high-level reservoir water supply pipe network 50 in the nuclear power plant;

block isolation S4: closing valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30;

operation stage S5: replacing each of the communication lines 38 with the replacement line 71;

recovery stage S6: gradually opening each valve connected to the peripheral fire fighting pipe network 30 in the host fire fighting pipe network 20, and then opening each valve from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, so as to fill water and exhaust gas in the pipelines from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30;

completion job S7: the main temporary line 61 and the auxiliary temporary line 62 are removed.

Through the step of the prefabricating stage F0, the replacement pipeline 71 can be prefabricated in advance, so that the time can be shortened when the pipeline is replaced, and the potential safety hazard is reduced.

By the above preparation stage S1, the main temporary line 61 and the auxiliary temporary line 62 can be connected in advance to reduce the time for replacement installation of the block valve 72, i.e., to reduce the working time, thereby reducing 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. The auxiliary temporary pipeline 62 is used for connecting the external pipeline 37 on the peripheral fire fighting pipe network 30 with the high-level reservoir water supply pipe network 50 in the nuclear power plant, and fire fighting water can be supplied to the peripheral fire fighting pipe network 30 through the high-level reservoir water supply pipe network 50 in the nuclear power plant, so that the fire fighting safety of equipment operation in a peripheral auxiliary system is guaranteed.

By the above-mentioned block isolation S4 step, the valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 are closed, so that the branch pipes 31 can be isolated to detach the communication pipes 38 and install the replacement pipes 71, thereby replacing the communication pipes 38.

In the recovery step S6, because the pressure on the host fire-fighting pipe network 20 is higher, generally about 12bar, and the pressure in the peripheral fire-fighting pipe network 30 is about 8bar, the valves connected to the peripheral fire-fighting pipe network 30 in the host fire-fighting pipe network 20 are gradually opened, so that the pressure of the pipeline between the host fire-fighting pipe network 20 and the peripheral fire-fighting pipe network 30 can be gradually recovered, the safety protection effect can be achieved, and the impact on the pipeline can be reduced; and then, starting the valves from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 to complete the recovery of the nuclear power station fire-fighting pipe network.

Compared with the prior art, the method for optimizing the fire-fighting pipe network of the nuclear power station on line has the advantages that the replacement pipeline 71 with the isolating valve 72 is prefabricated, the pipeline at the outlet of the fire-fighting water pump set 11 is connected with the host fire-fighting pipe network 20 by using the main temporary pipeline 61, and the external pipeline 37 on the peripheral fire-fighting pipe network 30 is connected with the high-level reservoir water supply pipe network 50 in the nuclear power station by using the auxiliary temporary pipeline 62; thereby after closing each valve on with host computer fire control pipe network 20 to peripheral fire control pipe network 30, can guarantee that host computer fire control pipe network 20 and peripheral fire control pipe network 30 have fire water, in order to guarantee steam turbine group system and peripheral auxiliary system safe operation, reduce the potential safety hazard, and then increase block valve 72 on each branch line 31, in order to guarantee that each isolation valve on sequent host computer fire control pipe network 20 to peripheral fire control pipe network 30 is interior to leak, only need to close block valve 72 can, need not to close each valve on host computer fire control pipe network 20 and fire water pump group 11 to host computer fire control pipe network 20 pipeline, and not only convenient operation, and assurance steam turbine group system safe operation that can be better.

Further, referring to fig. 2, the optimized nuclear power plant fire-fighting pipe network system includes two sets of fire-fighting water pump units 11, a host fire-fighting pipe network 20 covering each steam turbine unit system, a supporting fire-fighting pipe network 40 covering each auxiliary supporting 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 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 pipe 12 is provided with an auxiliary mating pipe 41 extending to a corresponding mating fire pipe network 40, and each auxiliary mating pipe 41 is provided with a mating pipe isolation valve 42. 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 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 positions, close to the branching pipelines 31, of the parallel pipelines 32, a bypass pressure division pipeline 33 communicated with the peripheral fire-fighting pipeline network 30 is connected to the parallel pipeline 32 between the two parallel isolation valves 321, a bypass pressure reducing valve 331 is arranged on the bypass pressure division pipeline 33, a bypass rear isolation valve 333 is arranged behind the bypass pressure reducing valve 331, a bypass filter 332 is arranged in front of the bypass pressure reducing valve 331, and a bypass front isolation valve 334 is arranged in front of the bypass filter 332. The parallel line 32 is led out with a connecting line 34 which is communicated with other nuclear power stations 35. A branching pressure reducing valve 311 is further arranged on each branching pipeline 31 before the peripheral fire protection pipe network 30, a branching post-isolation valve 313 is arranged behind the branching pressure reducing valve 311, a branching filter 312 is arranged in front of the branching pressure reducing valve 311, and a branching pre-isolation valve 314 is arranged in front of the branching filter 312. An external pipeline 37 is left on the peripheral fire fighting pipe network 30.

The preparation stage S1 is to connect the external fire hose 14 to the external fire hydrant 23 using the main temporary pipeline 61. The high-level reservoir water supply pipe network 50 in the nuclear power plant is connected with the external pipeline 37 on the peripheral fire fighting pipe network 30 by using an auxiliary temporary pipeline 62.

In this embodiment, the two parallel isolation valves 321, the two branching pre-isolation valves 314, and the bypass pre-isolation valve 334 are isolation valves from the host fire protection pipe network 20 to the peripheral fire protection pipe network 30.

Further, referring to fig. 1 to fig. 3, as an embodiment of the method for optimizing a fire pipe network of a nuclear power plant on line provided by the present invention, the step of isolating the block 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: and closing the isolation valves from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 after the pressure reducing valves.

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. Through the third isolation block S43, water in the peripheral fire fighting pipe network 30 is prevented from flowing back to the branch pipes 31.

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 post bypass isolation valve 333 and the two post branching isolation valves 313 are actually closed. To achieve isolation of the two parallel isolation valves 321, the two split pre-isolation valves 314, and the bypass pre-isolation valve 334. Of course, in still other embodiments, the valves from each of the host fire fighting network 20 to the peripheral fire fighting network 30 are closed; the area isolation valve 121, the plant isolation valve 122, each control valve 21, the parallel isolation valve 321, the branching pre-isolation valve 314, the bypass pre-isolation valve 334, the branching post-isolation valve 313, and the bypass post-isolation valve 333 may be all closed.

Further, referring to fig. 1 to fig. 3, as an embodiment of the method for optimizing a fire pipe network of a nuclear power plant on line provided by the present invention, the step of isolating the blocks S4 further includes:

fourth isolation block S44: closing a valve 361 between the pressure reducing valves connected to a peripheral fire fighting pipe network in an auxiliary transformer plant fire fighting pipe network 36 in the nuclear power plant fire fighting pipe network system; namely, the valve 361 from the auxiliary transformer plant fire-fighting pipe network 36 to the bypass pressure reducing valve 331 and the branching pressure reducing valve 311 is closed. So as to better prevent the water backflow in the fire-fighting pipe network 36 of the auxiliary transformer plant.

fifth isolation block S45: the valves connecting the other-stage nuclear power plant 35 to the fire-fighting pipelines of the stage nuclear power plant are closed to isolate the fire-fighting pipe network between the other-stage nuclear power plant 35 and the stage nuclear power plant, and to prevent the influence on the fire-fighting pipe network of the other-stage nuclear power plant 35.

Further, referring to fig. 1 to fig. 3, as a specific implementation of the method for optimizing a fire pipe network of a nuclear power plant on line provided by the present invention, the step of the recovery stage S6 further includes:

and gradually opening valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30 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 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, so that the water pressure impact is reduced, and the safety is improved.

Further, referring to fig. 1 to fig. 3, as an embodiment of the method for optimizing a fire-fighting pipe network of a nuclear power plant on line provided by the present invention, in the step of the recovery stage S6, specifically, the area isolation valve 121 is opened, then one plant isolation valve 122 is opened step by step, fire-fighting water is filled into the branch line 31 and the parallel line 32 until the water pressure in the branch line 31 is consistent with the water pressure in the main water line 12. And then the control valve 21, the bypass post-isolation valve 333 and the two branch line post-isolation valves 313 from the corresponding branch line pipeline 31 in each set of host fire-fighting pipe network 20 are opened, and the valves 361 from the auxiliary transformer plant fire-fighting pipe network 36 to each pressure reducing valve in the nuclear power plant fire-fighting pipe network system are opened. Of course, it is also possible to gradually open one control valve 21 until the water pressure in the branch line 31 is the same as the water pressure in the main water line 12, then open the area isolation valve 121, the plant isolation valve 122, each control valve 21, the bypass post-isolation valve 333, and the two branch post-isolation valves 313, and open the valves 361 from the auxiliary transformer plant fire pipe network 36 to each pressure reducing valve in the nuclear power plant fire pipe network system.

Further, referring to fig. 1 to fig. 3, as a specific implementation of the method for optimizing a fire pipe network of a nuclear power plant on line 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. 3, as a specific embodiment of the method for optimizing a fire pipe network of a nuclear power plant online provided by the present invention, before the step of the emergency response F2, the method further includes the steps of: 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. 3, as a specific embodiment of the method for optimizing a fire pipe network of a nuclear power plant online provided by the present invention, before the step of the emergency response F2, the method further includes the steps of:

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 replacement pipeline operations.

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. 3, as a specific implementation of the method for optimizing a fire pipe network of a nuclear power plant on line provided by the present invention, the step of the preparation stage 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. 3, as a specific implementation of the method for optimizing a fire pipe network of a nuclear power plant on line provided by the present invention, the step of completing the operation 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. 3, as a specific implementation of the method for optimizing a fire pipe network of a nuclear power plant on line provided by the present invention, the step of the preparation stage 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 the communication pipeline 38 is arranged on the replacing branch pipeline 31, fire water in the corresponding pipeline needs to be discharged, and the temporary drainage pump is arranged, the drainage can be faster, and the safety and the working efficiency are improved.

Further, referring to fig. 1 to fig. 3, as a specific embodiment of the method for optimizing a fire pipe network of a nuclear power plant on line provided by the present invention, the temporary drainage pump is disposed in a region corresponding to the communication pipeline 38. So as to drain water more quickly and improve efficiency.

Example two:

referring to fig. 1, fig. 2 and fig. 4, a method for optimizing a fire pipe network of a nuclear power plant on line according to a second embodiment of the present invention will now be described. The method for optimizing the fire-fighting pipe network of the nuclear power station on line comprises the following steps:

detection stage D1: detecting whether the isolating valves on the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 leak inwards or not; if yes, proceed to block isolation step S4; if not, the following steps are carried out:

line isolation D2: closing valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30, closing valves from the fire pump unit 11 to the host fire fighting pipe network 20, and closing isolation valves from the host fire fighting pipe network 20 to the peripheral fire fighting pipe network 30; then, the above-mentioned working stage steps are carried out.

operation stage S5: replacing each of the communication lines 38 with the replacement line 71; replacing each isolation valve from the host fire pipe network 20 to the peripheral fire pipe network 30;

That is to say, the difference between the method for optimizing the fire pipe network of the nuclear power plant according to the embodiment of the present invention on line and the method for optimizing the fire pipe network of the nuclear power plant according to the first embodiment of the present invention on line is:

the method for optimizing the fire-fighting pipe network of the nuclear power station on line further comprises the following steps:

detection stage D1: detecting whether the isolating valves on the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 leak inwards or not; if yes, proceed the above-mentioned block isolation step S4; if not, the following steps are carried out:

The fire-fighting pipe network of the nuclear power station can be used in a multi-stage nuclear power station after being designed, simulated and verified. In all nuclear power stations, internal leakage occurs from the host fire-fighting pipe network 20 to each isolation valve on the peripheral fire-fighting pipe network 30, and in order to ensure the safety of subsequent use, the isolation valves from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 are convenient to replace in the subsequent process, before the damage of the isolation valves from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30, the isolating valve 72 can be additionally arranged on the branch line 31, so that the valves can be conveniently and timely replaced when the valves leak in the subsequent process.

The detection stage D1 can determine the status of each valve in the split line 31, i.e., the status of the two parallel isolation valves 321, the two split pre-isolation valves 314, and the bypass pre-isolation valve 334. If there is an internal leak between the isolation valves of the host fire protection pipe network 20 and the peripheral fire protection pipe network 30, the block isolation S4 can be performed. And if the host computer fire control pipe network 20 does not have interior hourglass to each isolation valve on the peripheral fire control pipe network 30, then can directly close each isolation valve on host computer fire control pipe network 20 to the peripheral fire control pipe network 30, and close the valve to peripheral fire control pipe network 30 in each host computer fire control pipe network 20, close the valve on fire water pump group 11 to each host computer fire control pipe network 20, can be with the isolation of complete separated time pipeline 31, and then can carry out the intercommunication pipeline 38 and change for replacing pipeline 71, the time is shortened, the efficiency is improved, and the risk is reduced.

In this embodiment, the two parallel isolation valves 321 and the two split pre-isolation valves 314 need to be replaced at the same time. In other embodiments, when two or more of the two parallel isolation valves 321, the two branching pre-isolation valves 314, and the bypass pre-isolation valve 334 leak and need to be replaced, the method for optimizing the fire-fighting pipe network of the nuclear power plant on line according to this embodiment may be used. Namely, the two parallel isolating valves 321, the two branching pre-isolating valves 314 and the bypass pre-isolating valve 334 are isolating 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.

Other steps of the online optimization method for the nuclear power plant fire pipe network in the embodiment may be the same as those of the online optimization method for the nuclear power plant fire pipe network in the embodiment i.

Referring to fig. 1, fig. 2 and fig. 4, as a specific embodiment of the method for optimizing a nuclear power plant fire protection pipe network on line according to the present invention, in the step of the detection stage D1, if it is detected that the isolation valves on the host fire protection pipe network 20 and the peripheral fire protection pipe network 30 leak inward, the operation stage S5 further includes a step of replacing the isolation valves. That is, when the isolation valves on the host fire protection pipe network 20 to the peripheral fire protection pipe network 30 leak inward, in the operation stage S5, the isolation valves on the host fire protection pipe network 20 to the peripheral fire protection pipe network 30 can be replaced at the same time; so as to increase the isolating valve 72 on the branching pipeline 31 and replace each isolating valve from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 at one time, thereby improving the safety.

Referring to fig. 1, fig. 2 and fig. 4, as a specific embodiment of the method for optimizing a nuclear power plant fire-fighting pipe network on line according to the present invention, in the step of the detection stage D1, if the host fire-fighting pipe network 20 is detected to leak into the isolation valves of the peripheral fire-fighting pipe network 30, the recovery stage S6 further includes closing the isolation valves, gradually opening the valves of the host fire-fighting pipe network 20 connected to the branch line 31, and then opening the fire-fighting water pump set 11 to the valves of the host fire-fighting pipe network 20; then, each isolation valve is replaced, the block valves are opened step by step, and the branch lines 21 are opened step by step to each valve on the peripheral fire fighting pipe network 30. Namely: if the internal leakage of each isolation valve from the host fire protection pipe network 20 to the peripheral fire protection pipe network 30 is detected, in the recovery stage S6, the area isolation valve 121 may be opened, and then one plant isolation valve 122 is opened step by step to fill fire protection water into the replacement pipe 71 on the branch pipe 31 until the water pressure in the replacement pipe 71 is the same as the water pressure in the main pipe 12. And then the control valves 21 from the host fire-fighting pipe network 20 to the corresponding branch pipeline 31 are opened, and then the isolation valves from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 are replaced, so that the host fire-fighting pipe network 20 works normally, the abnormal working time of the host fire-fighting pipe network 20 can be shortened, and the risk is reduced. After the isolation valves on the host fire-fighting pipe network 20 and the peripheral fire-fighting pipe network 30 are replaced, the isolation valves 72 are gradually opened until the water pressure in the branch pipeline 31 is consistent with the water pressure in the main water pipeline 12, then the bypass post-isolation valve 333 and the two branch post-isolation valves 313 are opened, and the valves 361 from the auxiliary transformer plant fire-fighting pipe network 36 to the pressure reducing valves in the nuclear power plant fire-fighting pipe network system are opened.

Other steps of the online optimization method for the nuclear power plant fire pipe network in the embodiment are the same as those of the online optimization method for the nuclear power plant fire pipe network in the embodiment one, and are not described again.

Example three:

referring to fig. 1, fig. 2 and fig. 5, a method for optimizing a fire pipe network of a nuclear power plant on line according to a third embodiment of the present invention will now be described. The difference between the online optimization method for the nuclear power station fire-fighting pipe network in the embodiment of the invention and the online optimization method for the nuclear power station fire-fighting pipe network in the embodiment I is as follows:

the preparation stage S1 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. Of course, in some embodiments, the time selection step S0 may be performed after the preparation step S1, or the preparation step S1 may be performed in synchronization with the time selection step S0.

Further, referring to fig. 1, fig. 2 and fig. 5, as a specific embodiment of the method for optimizing a fire pipe network of a nuclear power plant online provided by the present invention, before the step of isolating the block S4, the method further includes the steps of:

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, fig. 2 and fig. 5, as an embodiment of the method for optimizing a fire-fighting pipe network of a nuclear power plant on line provided by the present invention, the method further includes, before the step of isolating the block S4 and after the step of shutting down the overhaul system S2, the steps of:

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.

Example four:

referring to fig. 1, fig. 2 and fig. 6, a method for optimizing a fire pipe network of a nuclear power plant on line according to a fourth embodiment of the present invention will now be described. The difference between the online optimization method for the nuclear power station fire-fighting pipe network in the embodiment of the invention and the online optimization method for the nuclear power station fire-fighting pipe network in the embodiment II is as follows:

the preparation stage S1 includes the following steps:

Further, referring to fig. 1, fig. 2 and fig. 6, as a specific embodiment of the method for optimizing a fire pipe network of a nuclear power plant online provided by the present invention, before the step of isolating the block S4, the method further includes the steps of:

Further, referring to fig. 1, fig. 2 and fig. 6, as an embodiment of the method for optimizing a fire-fighting pipe network of a nuclear power plant on line provided by the present invention, the method further includes, before the step of isolating the block S4 and after the step of shutting down the overhaul system S2, the steps of:

Other steps of the method for the online optimization of the nuclear power plant fire pipe network in the embodiment are the same as those of the method for the online optimization of the nuclear power plant fire pipe network in the second embodiment, and are not described again.

Referring to fig. 2, an embodiment of the present invention further discloses a nuclear power plant fire protection pipe network system, which includes two sets of fire protection water pump sets 11, a host fire protection pipe network 20 covering each steam turbine set system, a supporting fire protection pipe network 40 covering each auxiliary supporting system, and a peripheral fire protection 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 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 pipe 12 is provided with an auxiliary mating pipe 41 extending to a corresponding mating fire pipe network 40, and each auxiliary mating pipe 41 is provided with a mating pipe isolation valve 42. 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 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 positions, close to the branching pipelines 31, of the parallel pipelines 32, a bypass pressure division pipeline 33 communicated with the peripheral fire-fighting pipeline network 30 is connected to the parallel pipeline 32 between the two parallel isolation valves 321, a bypass pressure reducing valve 331 is arranged on the bypass pressure division pipeline 33, a bypass rear isolation valve 333 is arranged behind the bypass pressure reducing valve 331, a bypass filter 332 is arranged in front of the bypass pressure reducing valve 331, and a bypass front isolation valve 334 is arranged in front of the bypass filter 332. A branching pressure reducing valve 311 is further arranged on each branching pipeline 31 before the peripheral fire protection pipe network 30, a branching post-isolation valve 313 is arranged behind the branching pressure reducing valve 311, a branching filter 312 is arranged in front of the branching pressure reducing valve 311, and a branching pre-isolation valve 314 is arranged in front of the branching filter 312. An external pipeline 37 is left on the peripheral fire fighting pipe network 30. A section of each branch pipeline 31 close to the corresponding host fire-fighting pipe network 20 is provided with a block valve 72.

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 a plurality of 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 with 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 and used in the nuclear power station for a plurality of periods after the design, the simulation and the verification of the fire protection pipe network system so as to ensure that the fire protection system can run timely and normally. 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, during the operation of the first-stage nuclear power plant in australia, the mountains, through long-term operation (up to 10 years) and observation of field operators, it is found that the pressure on the main fire-fighting pipe network 20 is higher, generally about 12bar, and the pressure in the peripheral fire-fighting pipe network 30 is about 8 bar. The pressure reduction from the main fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 needs to be carried out through a pressure reducing valve, and a filter needs to be arranged before fire-fighting water reaches the pressure reducing valve, namely, a bypass pressure reducing valve 331 is arranged on a bypass pressure dividing pipeline 33 in fig. 2, a bypass post-isolation valve 333 is arranged behind the bypass pressure reducing valve 331, a bypass filter 332 is arranged in front of the bypass pressure reducing valve 331, and a bypass pre-isolation valve 334 is arranged in front of the bypass filter 332. When the filter element in the filter is replaced, the isolation valves from the host fire pipe network 20 to the peripheral fire pipe network 30 need to be operated, so that the isolation valves are easy to leak inwards relative to other valves in the nuclear power station fire pipe network system.

According to the nuclear power station fire-fighting pipe network system, when the isolating valves from the host fire-fighting pipe network 20 to the peripheral fire-fighting pipe network 30 leak, only the isolating valve 72 needs to be closed, and valves from the host fire-fighting pipe network 20 and valves from the fire-fighting water pump set 11 to pipelines in the host fire-fighting pipe network 20 do not need to be closed, so that the operation is convenient, and the safe operation of a steam turbine set system can be better ensured.

Further, the nuclear power station fire protection pipe network system can be obtained by adopting the nuclear power station fire protection pipe network online optimization method of any of the above embodiments.

Further, a connection line 34 for connecting other phase nuclear power plants 35 is led out from the parallel line 32. Therefore, the fire-fighting pipe networks of power stations in each phase in the same nuclear power station are communicated, and the safety of the fire-fighting pipe networks is improved.

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

1. The method for optimizing the fire-fighting pipe network of the nuclear power station on line is characterized by comprising the following steps: the method comprises the following steps:

and (3) a recovery stage: gradually opening valves connected to the peripheral fire fighting pipe network in the host fire fighting pipe network, and then opening valves from the host fire fighting pipe network to the peripheral fire fighting pipe network so as to fill water and exhaust gas in pipelines from the host fire fighting pipe network to the peripheral fire fighting pipe network; the isolation valves from the host fire-fighting pipe network to the peripheral fire-fighting pipe network comprise two parallel isolation valves, two branch pre-isolation valves and a bypass pre-isolation valve;

and (4) finishing the operation: removing the primary temporary pipeline and the secondary temporary pipeline;

the block isolation step specifically includes:

a third isolation block: closing the isolation valve after each host fire-fighting pipe network reaches each pressure reducing valve on the peripheral fire-fighting pipe network;

a fourth isolation block: closing valves from the fire-fighting pipe network of the auxiliary transformer plant in the nuclear power station fire-fighting pipe network system to each pressure reducing valve;

a fifth isolation block: closing valves on fire lines connecting other phase nuclear power plants to the phase nuclear power plant;

the nuclear power station fire-fighting pipe network system 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; outlets of the two sets of fire pump groups are respectively connected to the two sets of host fire-fighting pipe networks through main water pipelines; the two main water pipelines are connected in parallel through a connecting pipeline; the positions, close to the fire pump sets, of the communication pipelines are respectively provided with a communication isolation valve, an external fire fighting pipe is reserved between the two communication isolation valves, and the external fire fighting pipe is provided with an external isolation valve; each main water pipeline is provided with an auxiliary matched pipeline which extends to the corresponding matched fire-fighting pipe network, and each auxiliary matched pipeline is provided with a matched pipeline isolation valve; the two host fire-fighting pipe networks are communicated through a communication pipeline, a communication isolation valve is arranged on the communication pipeline, and an external fire-fighting head is arranged on the communication isolation valve; a plant isolation valve is arranged at a position on each main water pipeline before reaching the corresponding host fire-fighting pipe network, and an area isolation valve is arranged at a position on each main water pipeline before reaching the plant isolation valve; branching pipelines which are respectively communicated with the peripheral fire fighting pipe network are led out from each set of host fire fighting pipe network, the two branching pipelines are communicated through a parallel pipeline, parallel isolation valves are respectively arranged at the positions, close to the respective branching pipelines, of the parallel pipelines, a bypass pressure division pipeline communicated with the peripheral fire fighting pipe network is connected onto the parallel pipeline between the two parallel isolation valves, a bypass pressure reducing valve is arranged on the bypass pressure division pipeline, a bypass postposition isolation valve is arranged behind the bypass pressure reducing valve, a bypass filter is arranged in front of the bypass pressure reducing valve, and a bypass preposition isolation valve is arranged in front of the bypass filter; a branching pressure reducing valve is arranged on each branching pipeline before the peripheral fire fighting pipe network, a branching post-isolation valve is arranged behind the branching pressure reducing valve, a branching filter is arranged in front of the branching pressure reducing valve, and a branching pre-isolation valve is arranged in front of the branching filter; an external pipeline is arranged on the peripheral fire-fighting pipe network; the method is characterized in that: and a section of each branch pipeline close to the corresponding host fire-fighting pipe network is provided with a closing valve.

2. The online optimization method for the fire pipe network of the nuclear power plant as recited in claim 1, characterized in that: the method for optimizing the fire-fighting pipe network of the nuclear power station on line further comprises the following steps:

3. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 2, characterized in that: in the step of the detection stage, if the internal leakage of each isolation valve from the host fire fighting pipe network to the peripheral fire fighting pipe network is detected, the operation stage further comprises the step of replacing each isolation valve.

4. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 2, characterized in that: in the step of the detection stage, if the internal leakage of each isolation valve from the host fire-fighting pipe network to the peripheral fire-fighting pipe network is detected, the recovery stage also comprises closing the isolation valve, gradually opening each valve connected to the branch line pipeline in the host fire-fighting pipe network, and then opening each valve from the fire-fighting water pump group to each host fire-fighting pipe network; and then each isolation valve is replaced, the isolating valves are opened step by step, and the branch pipelines are opened step by step to each valve on the peripheral fire fighting pipe network.

5. The method for optimizing a fire pipe network of a nuclear power plant according to any one of claims 1 to 4, wherein: the recovery phase step further comprises:

6. The method for optimizing a fire pipe network of a nuclear power plant according to any one of claims 1 to 4, wherein: each replacement pipeline further comprises two connecting pipelines respectively used for being connected with two ends of the isolating valve;

7. The method for optimizing a fire pipe network of a nuclear power plant according to any one of claims 1 to 4, wherein: each replacement pipeline further comprises two connecting pipelines respectively used for being connected with two ends of the isolating valve; the prefabricating stage step also comprises the step of respectively connecting the two connecting pipelines with two ends of the isolating valve;

8. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 7, wherein: the prefabrication stage step further comprises the step of arranging a bracket to support each replacement pipeline on the side of the corresponding communication pipeline.

9. The method for optimizing a fire pipe network of a nuclear power plant according to any one of claims 1 to 4, wherein: the preparation phase is followed by the steps of:

10. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 9, wherein: the emergency response step further comprises the following steps of: fire-fighting guarding: and informing the fire brigade to quit.

11. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 9, wherein: the emergency response step further comprises the following steps of:

12. The method for optimizing a fire pipe network of a nuclear power plant according to any one of claims 1 to 4, 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.

13. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 12, wherein: 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.

14. The method for optimizing a fire pipe network of a nuclear power plant according to any one of claims 1 to 4, wherein: the preparation phase step further comprises: setting a temporary draining pump for draining water in the draining pit;

15. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 14, wherein: the temporary draining pump is arranged in the area corresponding to the communicating pipeline.

16. The method for optimizing a fire pipe network of a nuclear power plant according to any one of claims 1 to 4, wherein: the preparation phase step further comprises the steps of:

time selection: and selecting a set of turboset for overhaul.

17. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 16, wherein: the block isolation step further comprises the following steps:

18. The on-line optimization method for the fire pipe network of the nuclear power plant as recited in claim 17, wherein: before the block isolation step, after the overhaul shutdown step, the method further comprises the following steps: