CN116271657A - Box type equipment fire extinguishing system for nuclear power plant - Google Patents

Abstract

The application discloses fire extinguishing system of box formula equipment for nuclear power plant includes: one end of the water inlet pipeline is suitable for being connected with the water supply device, the other end of the water inlet pipeline is connected with a water inlet of the nozzle pipeline, and the nozzle pipeline extends into the box body; the pneumatic isolation valve is arranged on the water inlet pipeline and used for controlling the on-off of the water inlet pipeline; one end of the pneumatic control pipeline is connected with the pneumatic isolation valve, the other end of the pneumatic control pipeline is in a closed state, and the pneumatic control pipeline is suitable for being filled with pressurized gas; the air exhaust structure is arranged at one end of the pneumatic control pipeline extending into the box body, the air exhaust structure is closed when the temperature in the box body is not higher than a set temperature value and is automatically opened when the temperature in the box body is higher than the set temperature value, and the pneumatic isolation valve is closed when the air exhaust structure is closed and is opened when the air exhaust structure is opened. The opening of the water inlet pipeline is controlled through the exhaust structure on the pneumatic control pipeline, so that the opening of the water inlet pipeline is more reliable.

Description

Fire protection system for box-type equipment used in nuclear power plants

technical field

The application relates to the technical field of fire protection, in particular to a box-type equipment fire protection system for nuclear power plants.

Background technique

In nuclear power plants, iodine absorber equipment is installed in some rooms in the control area and non-control area. The iodine absorber equipment is in a box type. Filtered before venting to atmosphere to comply with emission standards. According to the latest specification requirements, the iodine adsorber equipment containing 45kg and above activated carbon and other fast burning solids should be equipped with an automatic fire extinguishing system.

In existing nuclear power plants, the firefighting system of the iodine absorber equipment is started by manually connecting the firefighting water supply hose by on-site personnel. Although this solution avoids misoperations, the degree of automation is low and the firefighting action feedback is not timely.

Later, an automatic control fire protection system appeared to overcome the problems of low automation and untimely fire extinguishing action feedback in the aforementioned prior art. Specifically, the alarm signal sent by the smoke/heat detector was sent to the control system in the main control room , the main control room control system controls the electric control valve on the water inlet pipe to open according to the alarm signal, so that the water inlet pipe is in a smooth state, and the fire water enters the sprinkler pipe along the water inlet pipe, and is sprayed out from the sprinkler head to extinguish the fire.

However, this design still has the following deficiencies:

When the protection object is a nuclear safety-related item, if the electric control valve is opened due to misoperation, the sprinkler will start to spray water immediately, which will affect the system function and seriously threaten nuclear safety.

application content

Therefore, the technical problem to be solved by this application is to overcome the defect that the sprinkler head will misspray water due to the misoperation of the electric control valve in the fire protection system in the prior art, so as to provide a box-type fire control valve for nuclear power plants. Equipment fire system.

In order to solve the problems of the technologies described above, the technical scheme of the present application is as follows:

A fire protection system for box-type equipment used in a nuclear power plant, comprising:

A water inlet pipeline, one end of which is suitable for connecting to a water supply device, and the other end connected to the water inlet of the nozzle pipeline, and the nozzle pipeline extends into the box;

a pneumatic isolation valve, arranged on the water inlet pipeline for controlling the on-off of the water inlet pipeline;

A pneumatic control pipeline, one end is connected to the pneumatic isolation valve, and the other end is in a closed state, and the pneumatic control pipeline is suitable for being filled with pressurized gas;

Exhaust structure, located at one end of the pneumatic control pipeline protruding into the box, the exhaust structure is closed when the temperature in the box is not higher than the set temperature value and the temperature in the box is higher than It is automatically opened when the temperature value is set, and the pneumatic isolation valve is closed when the exhaust structure is closed and opened when the exhaust structure is opened.

Further, the exhaust structure is a closed nozzle.

Further, the closed nozzle is provided with a protective cover.

Further, the pneumatic control pipeline is also connected with a spare pneumatic control pipeline, and the spare pneumatic control pipeline is provided with a solenoid valve for controlling the on-off of the spare pneumatic control pipeline.

Further, it also includes an air supply pipeline, an air outlet of the air supply pipeline communicates with the pneumatic control pipeline, and an air inlet of the air supply pipeline is suitable for communicating with an air source.

Further, it also includes an alarm device and a control system in the main control room, and an electric control valve located between the pneumatic isolation valve and the water supply device is provided on the water inlet pipeline, and the alarm device is arranged in the box It is used to detect the fire signal in the box, the control system in the main control room is electrically connected with the electric control valve and the alarm device, and the control system in the main control room responds to the fire signal sent by the alarm device. The emotional signal controls the opening of the electric control valve.

Further, the alarm device includes a smoke fire detector for detecting a smoke signal in the box and a temperature fire detector for detecting a temperature signal in the box.

My plan number

Further, it also includes a liquid level detection pipeline communicated with the tank and a liquid level sensor arranged on the liquid level detection pipeline; the liquid level sensor is electrically connected with the control system of the main control room, suitable for In order to send the detected liquid level signal to the main control room control system, the main control room control system controls the electric control valve to close in response to the liquid level signal.

Further, the height of the communication position between the liquid level detection pipeline and the tank is higher than the height of the highest point of combustibles in the tank.

Further, it also includes a drainage pipeline communicating with the bottom of the box body, and an on-off valve is provided on the drainage pipeline to control the on-off of the drainage pipeline.

The technical solution of the present application has the following advantages:

1. For the fire protection system of box-type equipment used in nuclear power plants provided by this application, the exhaust structure is closed when the temperature in the box is not higher than the set temperature value, and it is automatically opened only when the temperature in the box is higher than the set temperature value. The pressurized gas in the pneumatic control pipeline is discharged from the open exhaust structure, the pneumatic isolation valve is opened, and the water enters the water inlet pipeline from the water supply device to extinguish the fire, which can avoid fires caused by temperature-sensitive fire detectors and/or smoke The malfunction of the detector causes the malfunction of the fire protection system of the box-type equipment used in nuclear power plants. The fire protection system is more reliable.

2. For the fire protection system of box-type equipment used in nuclear power plants provided by this application, an electric control valve located between the pneumatic isolation valve and the water supply device is also installed on the water inlet pipeline, and the fire signal sent by the alarm device is sent to the main control room for control. System, the main control room control system opens the electric control valve in advance in response to the fire signal, so that the electric control valve can be opened in advance when the pneumatic isolation valve is not opened, so that the water inlet pipeline can be flushed first, and the water inlet can be improved. In addition, the electric control valve and the pneumatic isolation valve double control the water inlet pipeline, which can prevent water from entering the nozzle pipeline when there is no fire, and improve system reliability.

3. For the fire protection system of box-type equipment used in nuclear power plants provided by this application, a liquid level sensor is installed on the liquid level detection pipeline. When the water level of the tank reaches the position of the liquid level detection pipeline, the liquid level sensor sends a liquid level signal to the main The control room control system, the main control room control system controls the closing of the electric control valve, which not only realizes the water submersion of the combustibles in the box, reduces the possibility of re-ignition, improves the reliability of fire extinguishing, but also closes the electric control valve in time, my plan number

Stop the water supply to the nozzle pipeline, reduce the waste of water resources, and avoid the overpressure of the box equipment.

Description of drawings

In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings that need to be used in the description of the specific embodiments or prior art. Obviously, the accompanying drawings in the following description The figures show some implementations of the present application, and those skilled in the art can obtain other figures based on these figures without any creative effort.

Fig. 1 is a schematic diagram of the fire protection system of the box-type equipment used in the nuclear power plant of the present application.

Explanation of reference signs:

1. Electric control valve; 2. Water inlet pipeline; 3. Pneumatic isolation valve; 4. Nozzle pipeline; 5. Temperature-sensitive fire detector; 6. Smoke-sensitive fire detector; 7. Main control room control system; 8. Liquid level sensor; 9. Drainage pipeline; 10. Combustibles; 11. Closed nozzle; 12. Solenoid valve; 13. Air source; 14. Pneumatic control pipeline; 15. Spare pneumatic control pipeline; 16. Liquid level 17. Box body; 18. Sprinkler head; 19. Protective cover; 20. Air supply pipeline; 21. On-off valve.

Detailed ways

The technical solutions of the present application will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the application and simplification of the description, rather than indicating or implying that the referred device or element must have a specific orientation, use a specific orientation construction and operation, therefore should not be construed as limiting the application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and should not be construed as indicating or implying relative importance.

My plan number

In the description of this application, it should be noted that unless otherwise specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it can be mechanically connected or electrically connected; it can be directly connected or indirectly connected through an intermediary, and it can be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in this application in specific situations.

In addition, the technical features involved in the different embodiments of the present application described below may be combined as long as they do not constitute a conflict with each other.

Example

As shown in Figure 1, this embodiment provides a fire fighting system for nuclear power plant box-type equipment, which is used for fire extinguishing of nuclear power plant box-type equipment, including a water supply device (not shown), a water inlet pipeline 2, a pneumatic isolation valve 3, Pneumatic control pipeline 14, exhaust structure.

The water supply device usually includes a fire pool and a fire pump installed on the water inlet pipeline 2 .

One end of the water inlet pipeline 2 is connected to the water supply device, and the other end is connected to the water inlet of the nozzle pipeline 4 . Sprinkler 18 is housed on the sprinkler pipeline 4, and the water that sprinkler 18 sprays enters the fire extinguishing in casing 17, and in order to be convenient to spray water and extinguish fire in casing 17, sprinkler pipeline 4 needs to stretch in the casing 17.

The pneumatic isolation valve 3 is arranged on the water inlet pipeline 2 for controlling the on-off of the water inlet pipeline 2 .

One end of the pneumatic control pipeline 14 is connected to the pneumatic isolation valve 3, and the other end is in a closed state. The pneumatic control pipeline 14 is suitable for being filled with pressurized gas, and the pressurized gas presses the valve core of the pneumatic isolation valve 3, and the valve core blocks the inlet. The water pipeline 2 prevents water from entering the sprinkler pipeline 4.

The exhaust structure is installed on the pneumatic control pipeline 14 . When the temperature in the box 17 is not higher than the set temperature value, the exhaust structure is closed, the pressurized gas in the pneumatic control pipeline 14 will not be discharged, the pressurized gas forces the pneumatic isolation valve 3 to close, and the water inlet pipeline 2 is in the off state. open state. When the temperature in the box 17 reaches the set temperature value, the exhaust structure is automatically opened, the pressurized gas in the pneumatic control pipeline 14 is discharged, and the air pressure in the pneumatic control pipeline 14 is reduced, which is not enough to resist the pneumatic isolation valve 3 spool, the pneumatic isolation valve 3 is opened, and the water inlet pipeline 2 is connected. In addition, the exhaust structure is set at one end of the pneumatic control pipeline 14 extending into the box body 17, so that in the event of a fire, when the temperature inside the box body 17 rises to the set temperature value, the exhaust structure can be opened in time, avoiding my solution It is impossible to respond to the temperature in the box body 17 in time because the exhaust structure is arranged outside the box body 17 .

In this embodiment, the exhaust structure is a closed nozzle 11, and the closed nozzle 11 is provided with a release element made of fusible alloy. When the temperature of the release element does not reach the set temperature value, the release element will not melt. The pneumatic control tube A sealed space is formed between the road 14, the pneumatic isolation valve 3 and the exhaust structure, and the pressurized gas inside is sealed. When the temperature reaches the predetermined temperature value of the release element, the release element melts, the closed nozzle 11 is open, and the pneumatic control pipeline The gas in 14 is discharged from the open closed nozzle 11, the air pressure in the pneumatic control pipeline 14 decreases, and the spool of the pneumatic isolation valve 3 moves, so that the water inlet pipeline 2 is connected, and the water can flow from the fire pool along the water inlet pipe. The road 2 and the sprinkler pipeline 4 enter the sprinkler 18 for fire extinguishing. In actual use, in order to avoid the situation where there is no fire, the release element falls off from the closed sprinkler 11 due to collision, the gas in the pneumatic control pipeline 14 is discharged, the pneumatic isolation valve 3 is opened, and water enters the sprinkler for spraying Therefore, a protective cover 19 is provided outside the closed nozzle 11, and the protective cover 19 is hollowed out to facilitate the discharge of pressurized gas from the open closed nozzle 11.

In addition, the pneumatic control pipeline 14 is also connected with a spare pneumatic control pipeline 15, and the spare pneumatic control pipeline 15 is provided with a solenoid valve 12 for controlling the on-off of the spare pneumatic control pipeline 15. In case of fire, the electromagnetic valve 12 can be manually opened in time to open the spare pneumatic control pipeline 15, the pressurized gas in the pneumatic control pipeline 14 is discharged, the pneumatic isolation valve 3 is opened, and water enters the nozzle pipeline 4 from the water inlet pipeline 2 , and finally spray out the fire from the sprinkler head 18, so that the fire is extinguished at the initial stage of the fire, the fire extinguishing efficiency is improved, and the loss is reduced.

In this embodiment, the closed nozzle 11 is closed when the temperature in the box body 17 is not higher than the set temperature value, and is automatically opened only when the temperature in the box body 17 is higher than the set temperature value. The pressurized gas is discharged from the opened closed nozzle 11, and the pneumatic isolation valve 3 is opened, and the water enters the water inlet pipeline 2 from the water supply device for fire extinguishing, which can avoid misfires caused by temperature-sensitive fire detectors and/or smoke-sensitive fire detectors. The action leads to the malfunction of the fire protection system of the box-type equipment used in nuclear power plants, and it can also prevent the operator from accidentally opening the electric valve to cause the malfunction of the fire-fighting system of the box-type equipment used in nuclear power plants, making the fire protection system of the box-type equipment used in nuclear power plants more efficient. reliable.

Of course, regardless of the pressure in the pneumatic control pipeline 14 caused by the melting of the release element of the closed nozzle 11

Whether the gas is discharged or the solenoid valve 12 is manually opened to cause the pressurized gas in the pneumatic control pipeline 14 to be discharged. After the fire-fighting action is completed, it is necessary to replenish the pressurized gas into the pneumatic control pipeline 14 through the air supply pipeline 20 for the next time. use. In this embodiment, the air outlet of the air supply pipeline 20 communicates with the pneumatic control pipeline 14 , and the air inlet of the air supply pipeline is suitable for communicating with the air source 13 .

The fire protection system of box-type equipment used in nuclear power plants also includes electric control valve 1, alarm device, main control room control system 7, liquid level detection pipeline 16, liquid level sensor 8, and drainage pipeline 9.

The electric control valve 1 is arranged on the water inlet pipeline 2, and is located between the pneumatic isolation valve 3 and the water supply device.

The alarm device is arranged in the box body 17 and is used to detect the fire signal in the box body 17. The electric control valve 1 and the alarm device are electrically connected with the main control room control system 7, and the main control room control system 7 responds to the fire signal sent by the alarm device The fire signal controls the electric control valve 1 to open, so that the water inlet pipeline 2 between the water supply device and the electric control valve 1 is filled with water, so as to prepare for fire extinguishing in advance. After the release element melts, the pneumatic isolation valve 3 is opened, and the water can quickly reach the sprinkler pipeline 4 along the water inlet pipeline 2, and then spray out from the sprinkler head 18 on the sprinkler pipeline 4 to extinguish the fire. Water efficiency. In addition, the electric control valve and pneumatic isolation valve double control the water inlet pipeline, which can prevent water from entering the sprinkler pipeline when there is no fire, and improve system reliability. In this embodiment, the alarm device includes a smoke detector 6 for detecting the smoke signal in the box 17 and a temperature-sensitive fire detector 5 for detecting the temperature signal in the box 17, and both the smoke signal and the temperature signal reach After the control system 7 in the main control room, the control system 7 in the main control room will control the opening of the electric control valve 1. In this way, the electric control valve 1 can be opened only when the smoke detector 6 and the temperature fire detector 5 work together. It can avoid mistakenly opening the electric control valve 1 when there is no fire, causing the water inlet pipeline 2 to flush.

The liquid level detection pipeline 16 communicates with the tank body 17 , and the liquid level sensor 8 is arranged on the liquid level detection pipeline 16 . In this embodiment, the fire is extinguished by flooding the combustibles 10 in the tank 17 with water. Therefore, the height of the communication position between the liquid level detection pipeline 16 and the tank 17 needs to be higher than the highest point of the combustibles 10 in the tank 17. height, and the liquid level sensor 8 is also electrically connected with the control system 7 of the main control room. When the liquid level in the tank 17 reaches the position of the liquid level detection pipeline 16, water enters the liquid level detection pipeline 16, the liquid level sensor 8 sends a liquid level signal to the main control room control system 7, and the main control room control system 7 responds The electric control valve 1 is controlled by the liquid level signal to close, the water supply to the sprinkler pipeline 4 is stopped, and the sprinkler 18 stops spraying water. In this way, water resources can be saved, the possibility of re-ignition can be reduced, and the fire extinguishing efficiency can be improved. Reliability, to avoid overpressure of box equipment.

The drain pipeline 9 communicates with the bottom of the box body 17 , and the drain pipeline 9 is provided with a switch valve 21 for controlling the on-off of the drain pipeline 9 .

The following introduces the working process of the fire protection system of the box-type equipment used in nuclear power plants:

At the initial stage of the fire, the smoke in the box 17 triggers the smoke detector 6, and the smoke signal from the smoke detector 6 is sent to the control system 7 in the main control room. As the fire develops, the temperature in the box 17 rises. The temperature signal of the temperature-sensitive fire detector 5 is also sent to the control system 7 of the main control room. After the control system 7 of the main control room receives the smoke signal and the temperature signal, it controls to open the electric control valve 1, and the water inlet pipe 2 is filled with water to provide fire extinguishing. Prepare to enter the water;

After the release element of the closed nozzle 11 on the nozzle pipeline 4 is melted, the closed nozzle 11 is open, the pressurized gas in the pneumatic control pipeline 14 is discharged, the air pressure in the pneumatic control pipeline 14 is reduced, and the pneumatic isolation valve 3 Open, the water enters the sprinkler head 18 along the water inlet pipeline 2 and the nozzle pipeline 4, and the sprinkler head 18 starts to spray water into the box body 17;

When the water level in the tank 17 reaches the position of the liquid level detection pipeline 16, the water enters the liquid level detection pipeline 16, and the liquid level sensor 8 sends a liquid level signal to the main control room control system 7, and the main control room control system 7 responds to The liquid level signal controls the electric control valve 1 to close, and stops the water supply to the nozzle pipeline 4;

After the water in the box body 17 is kept for a period of time, after the personnel confirm that the fire is under control on the spot, open the on-off valve 21 on the drainage pipeline 9, and the water in the box body 17 is discharged from the drainage pipeline 9;

After the water in the box body 17 is drained, close the on-off valve 21;

Replace the closed nozzle 11, and fill the pneumatic control pipeline 14 with pressurized gas for subsequent use. Of course, if the solenoid valve 12 is manually opened, then there is no need to replace the closed nozzle 11, just close the solenoid valve 12, and Fill the pneumatic control pipeline 14 with pressurized gas.

From the description of the above working process, it can be seen that the fire protection system of the nuclear power plant box-type equipment provided by this embodiment has a relatively high degree of automation.

As a supplementary note, for the solenoid valve 12, in addition to being manually controlled on site, it can also be controlled by the master program number.

The control room control system 7 is remotely controlled, which requires the solenoid valve 12 to be electrically connected to the main control room control system 7 . After the on-site personnel confirm the fire situation, they remotely control the opening of the electric control valve 1 and the opening of the solenoid valve 12 through the control system 7 of the main control room.

Apparently, the above-mentioned embodiments are only examples for clear description, rather than limiting the implementation. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. However, the obvious changes or changes derived therefrom are still within the protection scope of the invention of the present application.

Claims (10)

1. A fire-fighting system for nuclear power plant box-type equipment, characterized in that it comprises: One end of the water inlet pipeline (2) is suitable for connecting to the water supply device, and the other end is connected to the water inlet of the nozzle pipeline (4), and the nozzle pipeline (4) is suitable for extending into the box body (17); a pneumatic isolation valve (3), arranged on the water inlet pipeline (2) for controlling the on-off of the water inlet pipeline (2); A pneumatic control pipeline (14), one end is connected to the pneumatic isolation valve (3), and the other end is in a closed state, and the pneumatic control pipeline (14) is suitable for being filled with pressurized gas; Exhaust structure, set on one end of the pneumatic control pipeline (14) protruding into the box (17), the temperature of the exhaust structure in the box (17) is not higher than the set temperature value closed and automatically opened when the temperature in the box (17) is higher than the set temperature value, the pneumatic isolation valve (3) is closed when the exhaust structure is closed, and when the exhaust structure is opened open. 2. The fire-fighting system for nuclear power plant box-type equipment according to claim 1, characterized in that the exhaust structure is a closed nozzle (11). 3. The fire-fighting system for nuclear power plant box-type equipment according to claim 2, characterized in that a protective cover (19) is provided outside the closed nozzle (11). 4. The fire-fighting system of box-type equipment for nuclear power plants according to claim 1, characterized in that, the pneumatic control pipeline (14) is also connected with a spare pneumatic control pipeline (15), and the spare pneumatic control pipeline (15) The control pipeline (15) is provided with a solenoid valve (12) for controlling the on-off of the standby pneumatic control pipeline (15). 5. The fire-fighting system of box-type equipment for nuclear power plants according to claim 1, characterized in that it also includes an air supply pipeline (20), and the air outlet of the air supply pipeline (20) communicates with the pneumatic control pipe road (14), and the air inlet of the gas supply pipeline (20) is suitable for communicating with the gas source (13). 6. The fire-fighting system for nuclear power plant box-type equipment according to any one of claims 1-5, characterized in that it also includes an alarm device and a control system (7) in the main control room, and the water inlet pipeline ( 2) There is also an electric control valve (1) located between the pneumatic isolation valve (3) and the water supply device, and the alarm device is set in the box body (17) to detect the fire signal in the body, the main control room control system (7) is electrically connected with the electric control valve (1) and the alarm device, and the main control room control system (7) responds to the alarm device The fire signal sent out controls the electric control valve (1) to open. 7. The fire-fighting system for nuclear power plant box-type equipment according to claim 6, wherein the alarm device includes a smoke detector (6) for detecting smoke signals in the box (17) ) and a temperature-sensitive fire detector (5) for detecting a temperature signal in the casing (17). 8. The fire-fighting system for nuclear power plant box-type equipment according to claim 6, characterized in that, it also includes a liquid level detection pipeline (16) communicated with the box body (17) and a liquid level detection pipeline (16) located at the liquid level. The liquid level sensor (8) on the level detection pipeline (16); the liquid level sensor (8) is electrically connected with the control system (7) of the main control room, and is suitable for sending the detected liquid level signal to The main control room control system (7), the main control room control system (7) controls the electric control valve (1) to close in response to the liquid level signal. 9. The fire-fighting system of box-type equipment for nuclear power plants according to claim 8, characterized in that, the height of the communication position between the liquid level detection pipeline (16) and the box body (17) is higher than that of the The height of the highest point of combustibles (10) in the casing. 10. The fire-fighting system of nuclear power plant box-type equipment according to claim 6, is characterized in that, also comprises the drainage pipeline (9) that is communicated with the bottom of described box body (17), and described drainage pipeline ( 9) is provided with an on-off valve (21) for controlling the on-off of the drainage pipeline (9).

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