阅读说明：本技术 一种核电站通风系统及其防火方法 (Nuclear power station ventilation system and fire prevention method thereof ) 是由 张丽丽 郭静涛 温华 李百利 康健 孙立臣 戴一辉 于 2021-08-25 设计创作，主要内容包括：本发明公开一种核电站通风系统,包括空调机组、送风管、排风管、第一末端防火阀、第二末端防火阀；送风管包括主送风管和分送风管,主送风管与空调机组相连；分送风管为多个,其进风端均与主送风管相连,其出风端分别与各个防火分区相连；第一末端防火阀为多个,其分设于各分送风管的出风端上；排风管包括主排风管、分排风管；分排风管为多个,其进风端分别与各个防火分区相连,其出风端均与主排风管相连；主排风管的出风端与空调机组的进风端和/或大气环境相连；第二末端防火阀为多个,其分设于各分排风管的进风端上。本发明还公开一种核电站通风系统的防火方法。本发明可以提高通风系统的防火可靠性,从而确保核电站运行的安全性和可靠性。(The invention discloses a ventilation system of a nuclear power station, which comprises an air conditioning unit, an air supply pipe, an exhaust pipe, a first tail end fire damper and a second tail end fire damper; the air supply pipe comprises a main air supply pipe and a distributing air pipe, and the main air supply pipe is connected with the air conditioning unit; the air inlet ends of the distribution air pipes are connected with the main air supply pipe, and the air outlet ends of the distribution air pipes are respectively connected with the fire-proof subareas; the first tail end fire-proof valves are arranged on the air outlet ends of the distribution air pipes respectively; the exhaust pipe comprises a main exhaust pipe and branch exhaust pipes; the branch exhaust pipes are multiple, the air inlet ends of the branch exhaust pipes are respectively connected with the fire-proof subareas, and the air outlet ends of the branch exhaust pipes are connected with the main exhaust pipe; the air outlet end of the main exhaust pipe is connected with the air inlet end of the air conditioning unit and/or the atmospheric environment; the second end fire prevention valves are a plurality of and are respectively arranged on the air inlet ends of the sub exhaust pipes. The invention also discloses a fire prevention method of the ventilation system of the nuclear power station. The invention can improve the fireproof reliability of the ventilation system, thereby ensuring the safety and reliability of the operation of the nuclear power station.)

1. A nuclear power station ventilation system is characterized by comprising an air conditioning unit (1), an air supply pipe (5), an exhaust pipe (6), a first tail end fire valve (31) and a second tail end fire valve (32),

the blast pipes comprise a main blast pipe (51) and a distributing air pipe (52),

the main blast pipe is connected with the air outlet end of the air conditioning unit, the number of the distributing air pipes is multiple, the air inlet ends of the distributing air pipes are all connected with the main blast pipe, the air outlet ends of the distributing air pipes are respectively connected with each fireproof subarea (30) in the nuclear power station,

the number of the first end fire-proof valves is multiple, and the multiple first end fire-proof valves are respectively arranged on the air outlet ends of the distributing air pipes and are respectively used for controlling the on-off of the distributing air pipes;

the exhaust pipe comprises a main exhaust pipe (61) and a branch exhaust pipe (62),

the number of the sub exhaust air pipes is multiple, the air inlet ends of the sub exhaust air pipes are respectively connected with the fire-proof subareas, the air outlet ends of the sub exhaust air pipes are all connected with the air inlet end of the main exhaust air pipe, the air outlet end of the main exhaust air pipe is connected with the air inlet end of the air conditioning unit and/or the atmospheric environment,

the number of the second tail-end fire-proof valves is multiple, and the multiple second tail-end fire-proof valves are respectively arranged on the air inlet ends of the sub-exhaust pipes and are respectively used for controlling the on-off of the sub-exhaust pipes.

2. Nuclear power plant ventilation system according to claim 1, further comprising a fire protection cladding (8),

the fireproof coating layers are arranged outside the main air supply pipe, the distributing air pipes, the main exhaust air pipes and the distributing air pipes.

3. The nuclear power plant ventilation system of claim 2, wherein the fireproof coating layer is made of ceramic fiber cotton, the thickness of the fireproof coating layer is 80-100mm, and the fire resistance limit is more than or equal to 2 h.

4. The nuclear power plant ventilation system of claim 2, further comprising a control component,

the control component comprises a fire detector and a fire control cabinet,

the fire detectors are respectively arranged in the fire-proof subareas and are respectively electrically connected with the fire-fighting control cabinet, and are respectively used for detecting whether the fire happens in each fire-proof subarea and sending a firing signal to the fire-fighting control cabinet when the fire happens,

the fire control cabinet is respectively and electrically connected with each first end fire prevention valve and each second end fire prevention valve, is used for controlling corresponding first end fire prevention valve and the closing of corresponding second end fire prevention valve when receiving the signal that catches fire.

5. Nuclear power plant ventilation system according to claim 2, further comprising a first boundary isolation valve (2) and a second boundary isolation valve (7),

the first boundary isolation valve is arranged on the air inlet end of the main air supply pipe, and the second boundary isolation valve is arranged on the air outlet end of the main exhaust pipe.

6. Nuclear power plant ventilation system according to claim 5, further comprising a regulating valve (3) and/or a muffler (4),

the regulating valve and the silencer are both arranged on the main blast pipe and are both positioned at the downstream of the first boundary isolating valve,

and the regulating valve and the silencer are both provided with fireproof coating layers.

7. The nuclear power plant ventilation system as claimed in claim 2, wherein the main blast pipe, the sub-distribution air duct, the main exhaust air duct and the sub-exhaust air duct are high-pressure air ducts, and the design pressure of the high-pressure air ducts is 1500-5000 Pa.

8. Nuclear power plant ventilation system according to claim 2, further comprising a rack (9),

the number of the brackets is multiple, the brackets are distributed and fixedly arranged on the ceiling or the side wall of each fireproof subarea at intervals, the main blast pipe, the distributing air pipes, the main exhaust air pipes and the branch exhaust air pipes are all arranged on each bracket,

and the fireproof coating layer is arranged outside each bracket.

9. The nuclear power plant ventilation system of any one of claims 1 to 8, wherein the nuclear power plant ventilation system is a master control room air conditioning system, and a fire protection zone of the master control room air conditioning system comprises a master control room (11), a computer room (12), an office area (13), and a living area (14); alternatively, the first and second electrodes may be,

the nuclear power station ventilation system is a ventilation system between control cabinets, and a fire prevention partition of the ventilation system between the control cabinets comprises a remote shutdown station (21), a protection sequence group I room (22), a protection sequence group III room (23), a DCS cabinet room (24) and an emergency lighting storage battery room (25).

10. A fire protection method for a nuclear power plant ventilation system as claimed in any one of claims 1 to 9, characterized in that the method comprises:

under normal working conditions, a first end fire damper (31) on each distributing air pipe (52) and a second end fire damper (32) on each distributing air pipe (62) are opened to ventilate each fire-proof subarea;

when a fire disaster happens to any fire prevention subarea, the first tail end fire prevention valve on the distributing air pipe corresponding to the fire prevention subarea and the second tail end isolation valve on the corresponding distributing air pipe are closed, so that the fire prevention subarea where the fire disaster happens is isolated.

Technical Field

The invention relates to the technical field of nuclear engineering, in particular to a ventilation system of a nuclear power station and a fire prevention method thereof.

Background

According to the nuclear power plant design safety regulations (HAF102-2016), "the design must properly take into account internal hazards, such as fire, must provide proper precautions and mitigation to ensure safety from damage," and "proper air conditioning, heating, air cooling, and ventilation systems must be provided in auxiliary rooms or other areas of the nuclear power plant to maintain the required environmental conditions for safety critical systems and components under all nuclear power plant conditions. The air conditioning system of the main control room of the nuclear power station and the ventilation system between the control cabinets are nuclear safety related level ventilation systems, measures need to be taken in design to reduce the influence of fire on the habitability of the main control room and the normal operation of nuclear safety level equipment such as DCS cabinets and the like, and therefore the reliability and the safety of the nuclear power station design are improved.

And, according to the pressurized water reactor nuclear power plant fire protection design and construction rules (RCC-I), "a fire damper is installed in a through hole of each fire protection area without installing on each partition wall, and in the arrangement, a sheet iron air duct can be used for manufacturing, and although the material has no fire resistance, the arrangement can still avoid the spread of fire. However, depending on the location of the room in the ventilation system, this arrangement results in the disadvantage of interrupting the ventilation of some or all of the non-lit rooms ". In the nuclear power plant fire protection design specification (GB/T22158-2008), "the influence of the interruption of the ventilation of part or all of the room without fire caused by the closing of the fire damper should be considered in the design" so as to meet the design requirements of the design safety regulations of the nuclear power plant.

However, in the current nuclear power plant, at least the following problems exist in the design of the air conditioning system of the main control room and the ventilation system of the control cabinet:

1) in a main control room air conditioning system, an air conditioner room is connected with a plurality of fire partitions such as a main control room, a computer room, an office area, a living area and the like through a main air pipe, a plurality of fire valves are arranged on the main air pipe at intervals in a subsection mode, when any room except the main control room in a residence area of the main control room is in a fire disaster, the fire valves on the pipe sections of the main air pipe corresponding to the room need to be closed, after the fire valves are closed, the fire partitions at the downstream of the main air pipe of the main control room and the like can lose ventilation, even the whole main control room air conditioning system is stopped, the design does not consider the influence of the ventilation of the disconnected part or all of the un-ignited rooms caused by the closed fire valves, and the design requirement of a control room in the design safety regulation (HAF102-2016) of a nuclear power plant can not be met.

2) In the ventilation system between control cabinets, an air conditioner room is connected with rooms of a remote shutdown station and protection sequence groups I and III through a main air pipe (the reactor protection system comprises four protection sequence groups I, II, III and IV, wherein I and III are one group, II and IV are the other group, two rows of instrument control cabinet room sub-ventilation systems are respectively responsible for ventilation), a DCS cabinet room and an emergency lighting storage battery room are connected with a plurality of fire zones, a plurality of fire valves are arranged on the main air pipe at intervals, when a fire disaster happens to the room of the fire zone where the fire valves are located, the fire valves on the main air pipe sections corresponding to the room are required to be closed, and the fire valves are closed, so that the ventilation of the rooms of the fire zones located at the downstream of the main air pipe of the remote shutdown station, the protection sequence groups and the like is lost, even the ventilation system between the control cabinets is stopped, although the protection sequence group I and the protection sequence group III are arranged in two adjacent rooms and belong to different fire protection zones, due to the poor independence of the two rooms, when one room catches fire, the ventilation system of the other room is lost, and if the ventilation systems of the two protection sequence group rooms are lost, a reactor is stopped, and the operation reliability of the nuclear power plant is affected.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art, and provides a ventilation system of a nuclear power station and a fire prevention method thereof, which can improve the fire prevention reliability of the ventilation system so as to ensure the safety and reliability of the operation of the nuclear power station.

The technical scheme for solving the technical problems is as follows:

according to one aspect of the invention, a ventilation system of a nuclear power station is provided, which adopts the following technical scheme:

a ventilation system of a nuclear power station comprises an air conditioning unit, an air supply pipe, an exhaust pipe, a first end fire prevention valve and a second end fire prevention valve, wherein the air supply pipe comprises a main air supply pipe and a plurality of distributing air pipes, the main air supply pipe is connected with the air outlet end of the air conditioning unit, the number of the distributing air pipes is multiple, the air inlet ends of the distributing air pipes are all connected with the main air supply pipe, the air outlet ends of the distributing air pipes are respectively connected with all fire partitions in the nuclear power station, the number of the first end fire prevention valves is multiple, and the first end fire prevention valves are respectively arranged on the air outlet ends of the distributing air pipes and are respectively used for controlling the on-off of the distributing air pipes;

the exhaust pipe includes main exhaust pipe, branch exhaust pipe, the quantity of branch exhaust pipe is a plurality ofly, a plurality of air inlet ends that divide exhaust pipe respectively with each the fire prevention subregion links to each other, a plurality of air outlet ends that divide exhaust pipe all with the air inlet end of main exhaust pipe links to each other, the air outlet end of main exhaust pipe with air conditioning unit's air inlet end and/or atmospheric environment link to each other, the quantity of the terminal fire prevention valve of second is a plurality of, and a plurality of terminal fire prevention valves of second divide locate on the air inlet end of each branch exhaust pipe, are used for controlling the break-make of each branch exhaust pipe respectively.

Preferably, the ventilation system further comprises a fireproof coating layer, and the fireproof coating layer is arranged outside the main air supply pipe, the sub air distribution pipes, the main air exhaust pipe and the sub air exhaust pipes.

The fireproof coating layer is made of ceramic fiber cotton, the thickness of the fireproof coating layer is 80-100mm, and the fireproof limit is more than or equal to 2 h.

Preferably, this ventilation system still includes the control assembly, the control assembly includes fire detector and fire control switch board, the quantity of fire detector is a plurality of, and a plurality of detection fire detector divide and establish in each the fire prevention subregion, and respectively with the fire control switch board electricity is connected, is used for surveying whether conflagration takes place in each fire prevention subregion respectively, and when detecting the conflagration that takes place, sends the signal of catching fire for the fire control switch board, and the fire control switch board is connected with each first end fire prevention valve, each second end fire prevention valve electricity respectively for the first end fire prevention valve that receives to catch fire the signal and the second end fire prevention valve that corresponds close.

Preferably, the ventilation system further comprises a first boundary isolation valve and a second boundary isolation valve, wherein the first boundary isolation valve is arranged at the air inlet end of the main air supply pipe, and the second boundary isolation valve is arranged at the air outlet end of the main exhaust pipe.

Preferably, the ventilation system further comprises a regulating valve and/or a silencer, wherein the regulating valve and the silencer are arranged on the main air supply pipe and are located at the downstream of the first boundary isolation valve, and fireproof coating layers are arranged outside the regulating valve and the silencer.

Preferably, the main air supply pipe, the distribution air pipes, the main exhaust air pipes and the branch exhaust air pipes all adopt high-pressure air pipes, and the design pressure of the high-pressure air pipes is 1500-5000 Pa.

Preferably, the ventilation system further comprises a plurality of supports, the supports are fixedly arranged on the ceiling or the side wall of each fireproof partition at intervals, the main air supply pipe, the distribution air pipe, the main exhaust air pipe and the distribution air pipe are arranged on each support, and the fireproof coating layer is arranged outside each support.

Preferably, the ventilation system of the nuclear power station is a master control room air conditioning system, and a fire prevention partition of the master control room air conditioning system comprises a master control room, a computer room, an office area and a living area; alternatively, the first and second electrodes may be,

the nuclear power station ventilation system is a ventilation system between control cabinets, and a fire prevention partition of the ventilation system between the control cabinets comprises a remote shutdown station, a protection sequence group I room, a protection sequence group III room, a DCS cabinet room and an emergency lighting storage battery room.

According to another aspect of the invention, a fire protection method for the ventilation system of the nuclear power plant is also provided, and the technical scheme is as follows:

a method of fire protection for a nuclear power plant ventilation system as described above, the method comprising:

under normal working conditions, opening a first end fire damper on each distribution air pipe and a second end fire damper on each distribution air pipe to ventilate each fire-proof subarea;

when a fire disaster happens to any fire prevention subarea, the first tail end fire prevention valve on the distributing air pipe corresponding to the fire prevention subarea and the second tail end isolation valve on the corresponding distributing air pipe are closed, so that the fire prevention subarea where the fire disaster happens is isolated.

The nuclear power station ventilation system and the fire prevention method thereof can isolate the fire prevention subarea in fire, can prevent smoke gas and the like in fire from diffusing to other fire prevention subareas, do not influence the ventilation of other fire prevention subareas, reduce the mutual influence among all the fire prevention subareas, can avoid the shutdown of the whole ventilation system when any fire prevention subarea except an air conditioning unit room is in fire, and create conditions for the ventilation system to continuously execute the safety function, thereby improving the reliability of the ventilation system and further improving the safety and the reliability of the nuclear power station.

Drawings

FIG. 1 is a schematic structural diagram of a ventilation system of a nuclear power plant according to an embodiment of the invention;

FIG. 2 is a schematic structural diagram of a master control room air conditioning system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a ventilation system between control cabinets according to an embodiment of the present invention;

fig. 4 is a schematic structural diagram of a bracket according to an embodiment of the present invention.

In the figure: 1-an air conditioning unit; 2-a first boundary isolation valve; 3-adjusting the valve; 4-a silencer; 5-blast pipe; 51-a main blast pipe; 52-distributing air ducts; 6-an exhaust pipe; 61-main exhaust pipe; 62-air exhaust pipe; 7-a second boundary isolation valve; 8-fireproof coating layer; 9-a scaffold; 10-pre-embedded plates of the bracket;

11-a master control room; 111-a main control room first end fire damper; 112-a main control room second end fire damper; 12-a computer room; 121-a fire damper at a first end of a computer room; 122-a computer room second end fire damper; 13-office area; 131-a fire damper at a first end of an office; 132-office second end fire damper; 14-living area; 141-a first end fire damper of a living area;

21-remote shutdown station; 211-remote shutdown station first end fire damper; 212-remote shutdown station second end fire damper; 22-protected sequence group I room; 221-protection sequence group I first end fire damper; 222-a second end fire damper of protection sequence group I;

23-protected sequences group III room; 231-protection sequence group III first end fire damper;

232-a second end fire damper of protection sequence group III; 24-DCS cabinet; a first end fire damper between 241-DCS cabinets; 242-a second end fire damper between the DCS cabinets; 25-emergency lighting storage battery room; 251-a first end fire damper between emergency lighting accumulators;

30-fire partition; 31 a first end fire damper; 32-second end fire damper.

Detailed Description

In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the indication of orientation or positional relationship, such as "on" or the like, is based on the orientation or positional relationship shown in the drawings, and is only for convenience and simplicity of description, and does not indicate or imply that the device or element referred to must be provided with a specific orientation, constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "connected," "disposed," "mounted," "fixed," and the like are to be construed broadly, e.g., as being fixedly or removably connected, or integrally connected; either directly or indirectly through intervening media, or through the interconnection of two elements. The specific meaning of the above terms in the present invention can be understood in specific cases for those skilled in the art.

Example 1

As shown in fig. 1, the present embodiment discloses a nuclear power plant ventilation system, which includes an air conditioning unit 1, an air supply pipe 5, an exhaust pipe 6, a first end fire damper 31, and a second end fire damper 32. The blast pipe 5 comprises a main blast pipe 51 and a distribution air pipe 52, the main blast pipe 51 is connected with the air outlet end of the air conditioning unit 1, the number of the distribution air pipes 52 is multiple, the air inlet ends of the distribution air pipes 52 are connected with the main blast pipe 51 through flanges, the air outlet ends of the distribution air pipes 52 are respectively connected with each fireproof subarea 30 in the nuclear power plant, the number of the first end fireproof valves 31 is multiple, the first end fireproof valves 31 are respectively arranged on the air outlet ends of the distribution air pipes 52 and are respectively used for controlling the on-off of the distribution air pipes 52. The exhaust pipe 6 comprises a main exhaust pipe 61 and sub exhaust pipes 62, the number of the sub exhaust pipes 62 is multiple, the air inlet ends of the sub exhaust pipes 62 are respectively connected with the fireproof subareas 30 in the nuclear power station, the air outlet ends of the sub exhaust pipes 62 are connected with the air inlet end of the main exhaust pipe 61 through flanges, the air outlet end of the main exhaust pipe 61 is connected with the air inlet end of the air conditioning unit 1 and/or is connected with the atmospheric environment through an exhaust mechanism, the number of the second terminal fireproof valves 32 is multiple, the second terminal fireproof valves 32 are arranged on the air inlet end of each sub exhaust pipe 62 and are respectively used for controlling the on-off of each sub exhaust pipe 62.

Compared with the prior art, the ventilation system of the embodiment cancels the fire damper on the main air pipe in the prior art, and the first terminal fire damper 31 is arranged at the air outlet end of the distribution air pipe 52 and the second terminal fire damper 32 is arranged at the air inlet end of the branch exhaust air pipe 62, so that when any fire subarea 30 except the room of the air conditioning unit 1 is in fire, the fire subarea 30 in fire can be isolated without influencing the ventilation of other fire subareas, the mutual influence among the fire subareas is reduced, a condition is created for the ventilation system to continuously execute the safety function of the ventilation system, the problem that the ventilation of other fire subareas is lost or the whole ventilation system stops due to the fact that any fire damper is closed on the main air pipe in the prior art is avoided, and the reliability of the ventilation system is improved.

In some embodiments, the ventilation system further includes a fire-proof coating layer 8, and the fire-proof coating layer 8 is disposed outside the main air supply pipe 51, the sub-air supply pipes 52, the main air exhaust pipe 61, and the sub-air exhaust pipes 62 to perform fire-proof coating on the air pipes, so that fire-proof reliability of the ventilation system can be further improved, influence of fire in any fire-proof partition on the whole ventilation system is reduced, and safety, reliability, and economy of the nuclear power plant can be effectively improved. And, through setting up fire prevention coating 8, can also reduce the quantity of required fire prevention valve when main tuber pipe passes through different fire prevention subregion among the prior art, improve economic nature.

In some embodiments, the fire-retardant coating 8 may be made of ceramic fiber wool, with a thickness of 80-100mm and a fire-resistance limit of 2h or more.

Specifically, the thermal conductivity, combustion performance, moisture content and moisture permeability of the ceramic fiber cotton need to meet the national standard, prevent temperature conduction and secondary fire, and reduce heat conduction. In order to ensure that the fire endurance is more than or equal to 2h, at the moment, the fireproof coating layer 8 comprises an inner coating layer and an outer coating layer, the inner coating layer and the outer coating layer are both made of ceramic fiber cotton which meets the national standard and is made of the same material, and the fireproof coating layer 8 can further comprise silicon cloth which is arranged outside the outer coating layer.

And, because each tuber pipe is equipped with fire prevention coating 8 outward, temperature resistance obtains strengthening by a wide margin, but, under the high temperature condition, pressure also can be great, in order to prevent that each tuber pipe from breaking, the compressive property of each tuber pipe should suitably improve to guarantee the functional integrity of each tuber pipe.

In some embodiments, the main air supply pipe 51, the sub-air supply pipes 52, the main exhaust air pipes 61, and the sub-exhaust air pipes 62 are preferably high-pressure air pipes, and the high-pressure air pipes have higher design pressure and can improve the pressure resistance.

In this embodiment, the design pressure of the high-pressure air pipe is preferably 1500-.

In some embodiments, the ventilation system further comprises a control assembly comprising a fire detector and a fire control cabinet (not shown), wherein: the fire detectors are respectively arranged in the fire partitions, are respectively electrically connected with the fire control cabinet, are respectively used for detecting whether the fire partitions are in fire or not, and send firing signals to the fire control cabinet when the fire is detected; first end fire prevention valve 31 and the terminal fire prevention valve 32 of second are normally open state to make each fire prevention subregion normally ventilate, the fire control switch board is connected with each first end fire prevention valve 31, each terminal fire prevention valve 32 electricity respectively for control corresponding first end fire prevention valve 31 and the terminal fire prevention valve 32 of second that corresponds are closed when the signal that catches fire received, thereby realize keeping apart the fire prevention subregion of taking place a fire.

It should be noted that, in the present embodiment, each of the first end fire damper 31 and the second end fire damper 32 may be controlled by the fire signal sent by the fire control cabinet interlock fire detector in the above manner, may be remotely and manually controlled by a main control room or a local analog panel, or may be provided with a self-fusing device on the first end fire damper 31 and the second end fire damper 32, so that the first end fire damper 31 and the second end fire damper are closed by the self-fusing device in case of a fire.

In some embodiments, the ventilation system further comprises a first boundary isolation valve 2 and a second boundary isolation valve 7, wherein the first boundary isolation valve 2 is arranged on the air inlet end of the main air supply pipe 51, and the second boundary isolation valve 7 is arranged on the air outlet end of the main exhaust pipe 61.

In some embodiments, as shown in fig. 1, 2 and 3, the ventilation system further comprises a regulating valve 3 and/or a silencer 4, wherein the regulating valve 3 and the silencer 4 are both arranged on the main blast pipe 51 and are both positioned at the downstream of the first boundary isolation valve 5, and the regulating valve 3 and the silencer 4 are both externally provided with a fireproof coating 8 to improve the fireproof performance of the regulating valve and the silencer.

In some embodiments, as shown in fig. 4, the ventilation system further includes a plurality of brackets 9, the plurality of brackets 9 are fixed to each fire-protection zone at intervals, preferably fixed to the ceiling or the side wall of each fire-protection zone through a bracket pre-embedded plate 40, the main air supply pipe 51, the sub air supply pipe 52, the main exhaust pipe 61, and the sub exhaust pipe 62 are all provided on each bracket 9, and a fire-protection coating layer 8 is provided outside each bracket 9 to improve the fire-protection performance.

And, because each tuber pipe is equipped with fire prevention coating 8 outward, the whole weight of each tuber pipe increases, in order to ensure the stability and the reliability of support, can suitably shorten the interval between the support.

In some embodiments, the distance between the brackets 9 may be 1.5-3m, and the shape of the bracket embedded plate 10 may be selected according to the distance between two adjacent brackets 9.

Specifically, when the distance between two adjacent brackets 9 is 1.5m, the shape selection of the bracket embedded plate 10 is preferably an X shape (300mm × 25 mm). When the distance between two adjacent brackets is 3m, the shape selection of the bracket embedded plate 10 is preferably K-shaped (300mm by 25 mm).

In some embodiments, as shown in fig. 2, the ventilation system of the nuclear power plant is a master control room air conditioning system, and the fire protection zone 30 of the master control room air conditioning system includes a master control room 11, a computer room 12, an office area 13, and a living area 14. At this time, as shown in fig. 1: the first end fire damper 31 comprises a main control room first end fire damper 111, a computer room first end fire damper 121, an office area first end fire damper 131 and a living area first end fire damper 141, the main control room first end fire damper 111 is arranged at the air outlet end of the distributing air pipe 52 corresponding to the main control room 11, the computer room first end fire damper 121 is arranged at the air outlet end of the distributing air pipe 52 corresponding to the computer room 12, the office area first end fire damper 131 is arranged at the air outlet end of the distributing air pipe 52 corresponding to the office area 13, and the living area first end fire damper 141 is arranged at the air outlet end of the distributing air pipe 52 corresponding to the living area 14; the second end fire damper 32 includes a main control room second end fire damper 112, a computer room second end fire damper 122, an office area second end fire damper 132, and a living area second end fire damper (not shown in the drawings, but not shown in the drawings), the main control room second end fire damper 112 is disposed at the air inlet end of the sub-exhaust duct 62 corresponding to the main control room 12, the computer room second end fire damper 122 is disposed at the air inlet end of the sub-exhaust duct 62 corresponding to the computer room 12, the office area second end fire damper 132 is disposed at the air inlet end of the sub-exhaust duct 62 corresponding to the office area 13, and the living area second end fire damper can be disposed at the air inlet end of the sub-exhaust duct corresponding to the living area; the main air supply pipe 51 may be provided with the above-described damper valve 3 and the muffler 4.

When a fire occurs in any one or more fire-protection subareas 30 in the main control room 11, the computer room 12, the office area 13 and the living area 14, a fire signal can be sent to the fire control cabinet through the fire detector in the fire-protection subarea 30, the first terminal fire-protection valve on the distributing air pipe 52 and the second terminal fire-protection valve on the distributing air pipe 62 corresponding to the fire-protection subareas are closed in the automatic interlocking control mode of the fire control cabinet, so that the fire-protection subareas are isolated, smoke can be blocked and fire spreading can be prevented, the fire can be limited in the ignited area, the ventilation of other fire-protection subareas can not be influenced, the mutual influence among the fire-protection subareas can be reduced, conditions are created for the main control room air conditioning system to continuously execute the safety function of the main control room air conditioning system, and the reliability of the main control room air conditioning system is improved.

Specifically, when a fire breaks out in the main control room 11, the first end fire damper 111 and the second end fire damper 112 of the main control room are closed to isolate the main control room; when a fire disaster occurs in the computer room 12, closing the first end fire damper 121 and the second end fire damper 122 of the computer room to isolate the computer room; closing the office first end fire damper 131 and the office second end fire damper 132 to isolate the office in case of a fire in the office 13; when a fire breaks out in the living area 14, the living area first end fire prevention valve 141 and the living area second end fire prevention valve are closed to isolate the living area.

Compared with the prior art, because no fire damper is arranged on the main blast pipe 51 of the main control room air conditioning system, except for the fire of the air conditioner room, the situation that the fire damper is suddenly closed on the main blast pipe can not occur, and the problem that other fire partitions lose ventilation or the whole system stops running due to the fact that any fire damper is closed on the main blast pipe in the prior art can be avoided.

In some embodiments, as shown in FIG. 3, the nuclear power plant ventilation system is a inter-control cabinet ventilation system, the fire zone 30 of which includes the remote shutdown station 21, the protection sequence group I room 22, the protection sequence group III room 23, the DCS inter-cabinet 24, and the emergency lighting battery room 15. At this time, as shown in fig. 2, the first end fire damper 31 includes a remote shutdown station first end fire damper 211, a protection sequence group I first end fire damper 221, a protection sequence group III first end fire damper 231, a first end fire valve 241 between the DCS cabinet rooms and a first end fire valve 251 between the emergency lighting storage batteries, wherein the first end fire valve 211 of the remote shutdown station is arranged at the air outlet end of the distribution air pipe 52 corresponding to the remote shutdown station 21, the first end fire valve 221 of the protection sequence group I is arranged at the air outlet end of the distribution air pipe 52 corresponding to the room 22 of the protection sequence group I, the first end fire valve 231 of the protection sequence group III is arranged at the air outlet end of the distribution air pipe 52 corresponding to the room 23 of the protection sequence group III, the first end fire valve 241 between the DCS cabinet rooms is arranged at the air outlet end of the distribution air pipe 52 corresponding to the DCS cabinet room 24, and the first end fire valve 251 between the emergency lighting storage batteries is arranged at the air outlet end of the distribution air pipe 52 corresponding to the emergency lighting storage battery room 25; the second end fire damper 32 includes a remote shutdown station second end fire damper 212, a protection sequence group I second end fire damper 222, a protection sequence group III second end fire damper 232, a DCS inter-cabinet second end fire damper 242, and an emergency lighting inter-battery second end fire damper (not shown, but omitted), the second-end fire valve 212 of the remote shutdown station is arranged at the air inlet end of the branch exhaust pipe 62 corresponding to the remote shutdown station 21, the second-end fire valve 222 of the protection sequence group I is arranged at the air inlet end of the branch exhaust pipe 62 corresponding to the room 22 of the protection sequence group I, the second-end fire valve 232 of the protection sequence group III is arranged at the air inlet end of the branch exhaust pipe 62 corresponding to the room 23 of the protection sequence group III, the second-end fire valve 242 of the DCS inter-cabinet is arranged at the air inlet end of the branch exhaust pipe 62 corresponding to the DCS inter-cabinet 24, and the second-end fire valve of the emergency lighting inter-battery is arranged at the air inlet end of the branch exhaust pipe 62 corresponding to the emergency lighting inter-battery; the main air supply pipe 51 may be provided with only the above-described control valve 3.

When a fire breaks out in any one or more fire-protection subareas 30 of the remote shutdown station 21, the protection sequence group I room 22, the protection sequence group III room 23, the DCS cabinet room 24 and the emergency lighting storage battery room 25, a fire signal can be sent to a fire control cabinet by a fire detector in the fire-protection subarea 30, a first end fire valve on a distributing air pipe 52 and a second end fire valve on a distributing air pipe 62 corresponding to the fire-protection subarea are closed by the fire control cabinet in an automatic interlocking control mode and the like, so that the fire-protection subareas are isolated, smoke resistance can be performed, fire spread can be prevented, ventilation of other fire-protection subareas cannot be influenced, mutual influence among the fire-protection subareas can be reduced, and further the ventilation independence of the fire-protection subareas (particularly between the protection sequence group I room 22 and the protection sequence group III room 23) and the reliability and stability of the ventilation system among the control cabinets can be improved, the frequency of nuclear power station shutdown is reduced, and the reliability and safety of the nuclear power station operation are improved.

Specifically, when a fire occurs at the remote shutdown station 21, the remote shutdown station first end fire damper 211 and the remote shutdown station second end fire damper 212 are closed to isolate the remote shutdown station; when the room 22 of the protection sequence group I is in fire, closing the fire damper 221 at the first end of the protection sequence group I and the fire damper 222 at the second end of the protection sequence group I to isolate the room of the protection sequence group I; when the room 23 of the protection sequence group III is in fire, closing a first end fire damper 231 of the protection sequence group III and a second end fire damper 232 of the protection sequence group III to isolate the room of the protection sequence group III; when a fire disaster occurs in the DCS cabinet room 24, closing a first end fire damper 241 between the DCS cabinets and a second end fire damper 242 between the DCS cabinets to isolate the DCS cabinets; when a fire breaks out in the emergency lighting battery compartment 25, the first end fire damper 251 of the emergency lighting battery compartment and the second end fire damper of the emergency lighting battery compartment are closed to isolate the emergency lighting battery compartment.

Compared with the prior art, because the main blast pipe 51 of the ventilation system between the control cabinets is not provided with the fire damper, except the fire disaster of the air conditioning unit room, the situation that the fire damper on the main blast pipe is suddenly closed can not occur, and the problem that any fire damper on the main blast pipe is closed to cause other fire partitions to lose ventilation or the whole system is interrupted in the prior art can be avoided.

The nuclear power station ventilation system of this embodiment, set up first end fire prevention valve and divide the air inlet of arranging the tuber pipe to serve and set up the terminal fire prevention valve of second through the air-out end that divides the tuber pipe, and set up the fire prevention coating, can keep apart the fire prevention subregion that takes place the conflagration, can prevent that conflagration flue gas etc. from spreading to other fire prevention subregions, and do not influence the ventilation of other fire prevention subregions, reduce the mutual influence between each fire prevention subregion, when the conflagration takes place in arbitrary fire prevention subregion except air conditioning unit room, can avoid whole ventilation system to stop the fortune, condition has been created for ventilation system continues to carry out its safety function, thereby improve ventilation system's reliability, and then improve nuclear power station's security and reliability.

Example 2

The implementation discloses a fire protection method for a ventilation system of a nuclear power plant, which comprises the following steps:

under normal working conditions, the first end fire-proof valve 31 on each distributing air pipe 52 and the second end fire-proof valve 32 on each sub-exhaust air pipe 62 are opened to ventilate each fire-proof subarea;

when a fire breaks out in any fire subarea 30, the first end fire valve 31 on the corresponding distributing air pipe 52 of the fire subarea 30 and the second end isolation valve 32 on the corresponding distributing air pipe 62 are closed, so that the fire subarea which breaks out is isolated.

Specifically, the ventilation system of the nuclear power plant may be a master control room air conditioning system, and as shown in fig. 1, the fire protection zone 30 of the master control room air conditioning system includes a master control room 11, a computer room 12, an office area 3, and a living area 14. When any one or more fire subareas in the main control room 11, the computer room 12, the office area 13 and the living area 14 are in fire, the fire detectors in the fire subareas send fire signals to the fire control cabinet, the first terminal fire valve 31 on the distributing air pipe 52 and the second terminal fire valve 32 on the distributing air pipe 62 corresponding to the fire subareas are closed in the automatic interlocking control mode of the fire control cabinet, and the like, so that the fire subareas are isolated, smoke can be blocked, fire spreading can be prevented, ventilation of other fire subareas cannot be influenced, mutual influence among the fire subareas can be reduced, conditions are created for the main control room air conditioning system to continuously execute safety functions, and reliability of the main control room air conditioning system is improved. Compared with the prior art, the method can avoid the problem that other fire prevention subareas lose ventilation or the whole system stops running due to the fact that any fire prevention valve on the main air pipe is closed in the prior art.

The nuclear power plant ventilation system may also be a control cabinet ventilation system, and as shown in fig. 2, a fire protection zone 30 of the control cabinet ventilation system includes a remote shutdown station 21, a protection sequence group I room 22, a protection sequence group III room 23, a DCS cabinet room 24, and an emergency lighting battery room 25. When any one or more fire-proof subareas of the remote shutdown station 21, the room 22 of the protection sequence group I, the room 23 of the protection sequence group III, the DCS cabinet room 24 and the emergency lighting storage battery room 25 are in fire, fire detectors in the fire-proof subareas send fire signals to a fire control cabinet, a first end fire valve 31 on a distributing air pipe 52 and a second end fire valve 32 on a distributing air pipe 62 corresponding to the fire-proof subareas are closed in an automatic interlocking control mode of the fire control cabinet, the fire-proof subareas are isolated, smoke can be blocked, fire spreading can be prevented, ventilation of other fire-proof subareas cannot be influenced, mutual influence among the fire-proof subareas can be reduced, ventilation independence of the fire-proof subareas (particularly between the room 22 of the protection sequence group I and the room 23 of the protection sequence group III) and reliability and stability of ventilation systems among the control cabinets are improved, the frequency of nuclear power station shutdown is reduced, and the reliability and safety of the nuclear power station operation are improved. Compared with the prior art, the method can avoid the problem that other fire prevention subareas lose ventilation or the whole system is interrupted due to the closing of any fire prevention valve on the main air pipe in the prior art.

The fire protection method of the nuclear power station ventilation system can isolate the fire protection subarea in fire, can prevent fire smoke and the like from diffusing to other fire protection subareas, does not influence the ventilation of other fire protection subareas, reduces the mutual influence among the fire protection subareas, can avoid the shutdown of the whole ventilation system when any fire protection subarea except an air conditioning unit room is in fire, and creates conditions for the ventilation system to continuously execute the safety function of the ventilation system, thereby improving the reliability of the ventilation system and further improving the safety and the reliability of the nuclear power station.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.