CN111803829A - A dry fire-fighting system for closed coal yard - Google Patents

Abstract

The invention relates to the technical field of fire fighting, in particular to a dry fire fighting system for a closed coal yard. The dry fire-fighting system for the closed coal yard comprises: the outdoor fire-fighting pipeline is suitable for being laid outdoors; a fire main adapted to be at least partially disposed within the coal shed and to maintain the interior evacuated in a non-operational state; the electrically operated valve is arranged close to the joint of the outdoor fire fighting pipeline and the fire fighting trunk pipe and is suitable for communicating the outdoor fire fighting pipeline with the fire fighting trunk pipe in a working state. According to the dry-type fire fighting system for the closed coal yard, the outdoor fire fighting pipeline and the fire fighting trunk pipe are respectively arranged, the outdoor fire fighting pipeline is connected with the fire fighting trunk pipe through the electric valve, the interior of the fire fighting trunk pipe is kept to be emptied in a non-working state, freezing of the pipe is avoided, and the fire fighting trunk pipe is quickly filled with water in a working state, so that fire is conveniently extinguished, and the freezing of the pipe caused by poor heat preservation effect due to the fact that the fire fighting trunk pipe is exposed out of the ground is avoided.

Description

A dry fire-fighting system for closed coal yard

technical field

The invention relates to the technical field of fire protection, in particular to a dry type fire protection system for a closed coal yard.

Background technique

At present, the types of automatic fire-fighting water cannons on the market are gradually increasing. In the existing technology, automatic fire-fighting water cannons have gradually begun to be popularized and applied in indoor construction places such as shopping malls and hospitals; closed coal yards are used as storage places for dry coal, and a large amount of long-term storage is stored in them. Dry coal is prone to spontaneous combustion in the case of improper storage. Therefore, it is also necessary to arrange automatic fire-fighting water cannons to prevent fires in closed coal yard conditions. However, most of the fire-fighting water monitor systems are wet-type systems. By burying the fire-fighting pipes into the ground, connecting them to the indoor fire-fighting pipes, and then connecting the fire-fighting branch pipes from the indoor fire-fighting pipes to connect the fire-fighting water monitors. The fire-fighting branch pipes are insulated with rock wool; There is water in the pipes of the gun system for a long time. In the event of a fire, the pipes filled with water supply water to the fire monitor to carry out fire fighting. This kind of wet fire water cannon system does not affect the normal use in the southern region. However, in the northern cold region or even the extremely cold region, the fire protection branch pipe exposed to the ground is not effective, and it is easy to cause freezing pipes and affect the fire protection use.

SUMMARY OF THE INVENTION

Therefore, the technical problem to be solved by the present invention is to overcome the defect that the pipelines of the wet fire-fighting water monitor system in the prior art are easy to cause freezing pipes, thereby providing a dry fire-fighting system for closed coal yards that is not easy to cause freezing pipes.

In order to solve the above-mentioned technical problems, the present invention provides a dry fire-fighting system for a closed coal yard, comprising:

Outdoor fire pipeline, suitable for laying outdoors;

Fire mains, adapted to be arranged at least partially inside the coal shed and to keep the interior emptied when not in operation;

The electric valve is arranged near the connection between the outdoor fire fighting pipeline and the fire fighting main pipe, and is suitable for connecting the outdoor fire fighting pipeline and the fire fighting main pipe in a working state.

Further, the fire main pipe includes:

The fire inlet pipe, laid at the first height, is suitable for being directly or indirectly connected with the outdoor fire fighting pipe;

The annular pipe network, laid at the second height, is suitable for direct or indirect communication with the fire protection introduction pipe;

Wherein, the second height is higher than or equal to the first height.

Further, the annular pipe network is configured as annular pipes connected to each other at the end.

Further, the fire main pipe further includes a lift pipe, and the lift pipe is suitable for connecting the fire introduction pipe with the annular pipe network.

Further, several fire branch pipes are connected to the annular pipe network.

Further, a fire monitor is connected to the fire branch pipe.

Further, a plurality of exhaust valves are arranged on the annular pipe network, and the exhaust valves are arranged higher than the second height.

Further, at least one evacuation valve is further provided on the fire inlet pipe, and the evacuation valve is adapted to evacuate the fire main pipe after the electric valve is closed.

Further, the outdoor fire fighting pipeline includes at least two.

Further, the fire monitor is installed below the horse track on both sides of the central axis of the coal shed.

The technical scheme of the present invention has the following advantages:

1. The dry fire fighting system for a closed coal yard provided by the present invention is provided by separately setting the outdoor fire fighting pipeline and the fire fighting main pipe, and connecting the outdoor fire fighting pipeline and the fire fighting main pipe through an electric valve, so as to keep the fire fighting main pipe in a non-working state. Evacuate the interior to avoid freezing pipes, and open the electric valve under working conditions to connect the outdoor fire pipes with the fire main pipes, so that the water in the outdoor fire pipes can quickly fill the fire main pipes, so as to facilitate fire fighting and avoid exposure to the ground. The heat preservation measures adopted are not effective, resulting in freezing pipes and affecting the use of fire protection.

2. The dry fire fighting system for closed coal yard provided by the present invention does not need to use rock wool or other thermal insulation materials for thermal insulation. still operate normally.

3. The dry fire-fighting system for closed coal yard provided by the present invention can be arranged at any required position on the top of the coal shed by connecting a fire-fighting branch pipe on the annular pipe network and installing a fire monitor in the fire-fighting branch pipe at any required position on the top of the coal shed, and can be arranged as required. Individual control of each group of fire branches and monitors.

4. In the dry fire-fighting system for closed coal yard provided by the present invention, the exhaust valve is arranged at the highest part of the annular pipe network, so that the air in the fire-fighting main pipe can be quickly evacuated when water is passed through the fire-fighting main pipe.

5. In the dry fire fighting system for a closed coal yard provided by the present invention, the fire inlet pipe is further provided with at least one emptying valve, and the emptying valve is suitable for drying the fire fighting after the electric valve is closed. The tube is emptied.

6. In the dry fire fighting system for a closed coal yard provided by the present invention, the outdoor fire fighting pipeline includes at least two, and correspondingly, the number of fire inlet pipes connected to the outdoor fire fighting pipeline is also two, and the two fire inlet pipes are Electric valves are respectively arranged on the upper part, and further, there are also two lifting pipes connected with the two fire inlet pipes. Further, the two lifting pipes are connected to the same annular pipe network, so that the two outdoor fire protection pipes can be connected at the same time. To supply water to the same ring pipe network, through redundant settings, the fault tolerance rate is improved, and when there is a problem with one of the outdoor fire pipes and/or fire main pipes, it is guaranteed that the other can be used as a backup, and can be used in two outdoor fire pipes. When the pipes are connected at the same time, the water supply efficiency is improved.

Description of drawings

In order to illustrate the specific embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the specific embodiments or the prior art. Obviously, the accompanying drawings in the following description The drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

Fig. 1 is the pipeline arrangement schematic diagram of the dry fire-fighting system for closed coal yard according to the present invention;

Fig. 2 is the cross-sectional schematic diagram of the coal shed of the present invention;

Fig. 3 is the installation schematic diagram 1 of the fire monitor of the present invention;

Fig. 4 is the installation schematic diagram two of the fire monitor of the present invention;

5 is a schematic structural diagram of a fire monitor of the present invention.

Description of reference numbers:

10- Coal Shed, 11- Horse Road; 20- Fire Main Pipe, 21- Fire Intake Pipe, 22- Lift Pipe, 23- Ring Pipe Network, 24- Fire Branch Pipe, 25- Exhaust Valve, 26- Electric Valve, 27 -Empty Valve; 31-Fire Monitor, 311-Inlet Flange, 312-Horizontal Motor, 313-Cannon Body, 314-Mist Motor, 315-Cannon Head, 316-Locator, 317-Vertical Motor; 32-Automatic Exhaust valve group, 33-electric valve, 34-water flow indicator; 35-flame detection device, 351-image flame detector, 352-red and ultraviolet flame detector; 40-outdoor fire pipeline.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate The orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation or be constructed in a specific orientation. and operation, and therefore should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

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

1 and 2, the present embodiment provides a dry fire fighting system for a closed coal yard, including:

The outdoor fire fighting pipeline 40 is suitable for laying outdoors;

The fire main pipe 20 is adapted to be arranged at least partially inside the coal shed 10, and keep the interior empty in a non-working state;

The electric valve 26 is disposed near the connection between the outdoor fire fighting pipeline 40 and the fire fighting main pipe 20 , and is suitable for connecting the outdoor fire fighting pipeline 40 with the fire fighting main pipe 20 in a working state.

Preferably, the outdoor fire fighting pipes 40 are usually buried underground, which can save space on the ground on the one hand, and ensure that the outdoor fire fighting pipes 40 are protected by the soil layer on the other hand. Freezing does not occur.

Preferably, the fire main pipe 20 is at least partially exposed to the ground, which is different from the conventional fire main pipe 20 which needs to be insulated with rock wool. In this embodiment, the fire main pipe 20 does not need to be insulated with rock wool or other thermal insulation materials. , keep the interior of the fire main pipe 20 empty in the non-working state, so as to prevent the fire main pipe 20 from freezing when the temperature in the northern cold area or even the extremely cold area is low, so as to ensure that the fire protection system can still work when the temperature is too low. normal operation.

It should be noted that the non-working state refers to a state in which no fire occurs in the closed coal yard and the fire protection system is not activated. Correspondingly, the working state refers to the state in which a fire occurs in a closed coal yard and the fire protection system is activated.

In the dry fire fighting system for a closed coal yard provided in this embodiment, the outdoor fire fighting pipes 40 and the fire fighting main pipes 20 are separately arranged, and the outdoor fire fighting pipes 40 and the fire fighting main pipes 20 are connected through the electric valve 26. Keep the interior of the fire fighting main pipe 20 empty, avoid freezing pipes, and open the electric valve 26 in the working state to make the outdoor fire fighting pipe 40 and the fire fighting main pipe 20 conduct, so that the water in the outdoor fire fighting pipe 40 quickly fills the fire fighting main pipe 20, Therefore, it is convenient to carry out fire fighting and avoid freezing pipes due to the ineffectiveness of the heat preservation measures adopted for the exposed fire main pipes 20 on the ground, which will affect the use of fire fighting.

In the dry fire fighting system for a closed coal yard provided in this embodiment, the fire fighting main pipe 20 does not need to be insulated with rock wool or other thermal insulation materials, which saves costs on the one hand, and can prevent freezing on the other hand, and ensures that the fire fighting system is at an excessively low temperature. still operate normally.

Specifically, the fire main 20 includes:

The fire inlet pipe 21, which is laid at the first height, is suitable for being directly or indirectly connected to the outdoor fire fighting pipe 40;

The annular pipe network 23, which is laid at the second height, is suitable for direct or indirect communication with the fire protection introduction pipe 21;

Wherein, the second height is higher than or equal to the first height.

Preferably, the fire protection inlet pipe 21 is directly or indirectly connected to the outdoor fire protection pipeline 40. In this embodiment, the fire protection inlet pipe 21 is directly connected to the outdoor fire protection pipeline 40, and the electric valve 26 is arranged at On the fire inlet pipe 21, and the electric valve 26 is arranged at a position close to the outdoor fire protection pipe 40, so that after the electric valve 26 is opened, the water in the outdoor fire pipe 40 can flow into the outdoor fire pipe 40 quickly. The fire protection is introduced into the pipe 21 .

Preferably, the electric valve 26 is arranged in the valve well.

Preferably, the value range of the first height may be [-1m, 3m], and in this embodiment, the value of the first height may be -0.5m. Preferably, the value range of the second height may be [10m, 50m]. Preferably, in this embodiment, the value of the second height may be 30m.

Specifically, the annular pipe network 23 is configured as an annular pipe connected at the end. By configuring the annular pipe network 23 in a ring shape, the annular pipe network 23 can be arranged around the top of the coal shed 10, and at the same time, it can supply water to a plurality of the fire monitors 31 at the same time, so as to ensure the effectiveness and efficiency of the fire extinguishing area. degree of coverage.

Specifically, the fire main pipe 20 further includes a lift pipe 22 , and the lift pipe 22 is suitable for connecting the fire protection introduction pipe 21 with the annular pipe network 23 .

Preferably, the lift pipe 22 connects the fire protection introduction pipe 21 with the annular pipe network 23 , so that the fire protection introduction pipe 21 buried under the ground can communicate with the annular pipe network arranged on the top of the coal shed 10 23 conducts conduction, which is convenient for supplying water to the annular pipe network 23.

Referring to FIG. 3 and FIG. 4 , specifically, a plurality of fire branch pipes 24 are connected to the annular pipe network 23 .

Specifically, a fire monitor 31 is connected to the fire branch pipe 24 .

The fire monitor 31 can be arranged at any required position on the top of the coal shed 10 by externally connecting the fire branch pipe 24 on the annular pipe network 23 and the fire monitor 31 in the fire branch pipe 24, and each group of fire branch pipes 24 and Fire monitor 31 is individually controlled.

Specifically, the annular pipe network 23 is provided with a plurality of exhaust valves 25 , and the exhaust valves 25 are set higher than the second height.

The exhaust valve 25 is arranged at the highest part of the annular pipe network 23 , so that the air in the fire main pipe 20 can be quickly evacuated when water is passed through the fire main pipe 20 .

Specifically, the fire inlet pipe 21 is further provided with at least one evacuation valve 27, and the evacuation valve 27 is adapted to evacuate the fire main pipe 20 after the electric valve 26 is closed.

Preferably, the emptying valve 27 is adapted to stop the water supply of the outdoor fire fighting pipeline 40 to the fire fighting main pipe 20 after the electric valve 26 is closed, and to empty the remaining water in the fire fighting main pipe 20, which is convenient for reuse. . Preferably, the emptying valve 27 is arranged on the fire inlet pipe 21 , preferably at the lowest point of the fire inlet pipe 21 , so as to facilitate emptying the water in the fire main pipe 20 and avoid residues.

Specifically, the outdoor fire fighting pipes 40 include at least two.

Correspondingly, there are also two fire-fighting inlet pipes 21 connected to the outdoor fire-fighting pipes 40 , and electric valves 26 are respectively provided on the two fire-fighting inlet pipes 21 . There are also two. Further, the two lifting pipes 22 are connected to the same annular pipe network 23, so that the two outdoor fire protection pipes 40 can supply water to the same annular pipe network 23 at the same time. The fault tolerance rate is improved to prevent one of the outdoor fire protection pipes 40 and/or fire main pipes 20 from having a problem, ensuring that the other one can be used as a backup, and can improve the water supply efficiency when the two outdoor fire protection pipes 40 are connected at the same time.

Specifically, the fire monitor 31 is installed below the horse track 11 on both sides of the central axis of the coal shed 10 .

Further in conjunction with Fig. 1-Fig. 5, the dry fire fighting system for a closed coal yard provided by this embodiment further includes:

a flame detection device 35, the flame detection device 35 is adapted to detect the ignition point;

The fire monitor 31 includes at least two fire monitors 31 installed opposite to each other on both sides of the central axis of the coal shed 10 .

Preferably, the flame detection device 35 includes: an image flame detector 351 and a red-ultraviolet flame detector 352, the image flame detector 351 is suitable for detecting the ignition point of an open flame; the red-ultraviolet flame detector 352, It is suitable for detecting the ignition point of no open flame; by setting the image flame detector 351 and the red-ultraviolet flame detector 352 at the same time, the ignition point of the open fire can be found in time, and the ignition point of no open flame can be detected at the same time, so as to ensure the When a large amount of coal is stored in a coal plant and the temperature is too high, in the case of internal spontaneous combustion that does not produce a flame, the ignition point can be found in time, and corresponding fire-fighting and cooling measures can be taken to improve the safety of the coal yard. In coal mines, thermal power plants, thermal power plants and other places where coal needs to be stored and turned over, the long-term contact between coal and air will cause an oxidation reaction to release heat. Slow, poor ventilation, resulting in the accumulation of internal heat, the temperature inside the coal pile is getting higher and higher, when the temperature exceeds the spontaneous ignition point of coal, spontaneous combustion will occur, causing great damage to personnel and equipment. Therefore, it is necessary to set the image flame detector 351 and the red-ultraviolet flame detector 352 at the same time to seal the coal yard.

As shown in Figure 1, the closed coal yard is usually closed with a grid structure, which presents an arc-shaped arrangement as a whole, and its span often exceeds the range of a single fire monitor 31. There are coal piles below 10 and on both sides of the bucket turbine. The coal piles have a certain height, which further blocks the injection route of a single fire monitor. Therefore, two fire monitors 31 are installed opposite to each other on both sides of the central axis of the coal shed 10. Therefore, it is ensured that all areas of the closed coal yard in the width direction can be included in the range of the fire monitor.

And further, while ensuring that all areas of the closed coal yard in the width direction can be included in the range of the fire monitor, a group of fire monitors is set at a distance in the length direction of the closed coal yard, so as to ensure that the closed coal yard is in the length of the closed coal yard. All areas in the direction can also be included in the range of the fire monitor, so that the entire closed coal yard can be covered without dead ends.

Specifically, as shown in FIG. 4 and FIG. 5 , at least two fire monitors 31 are respectively installed below the horse tracks 11 on both sides of the central axis of the coal shed 10 . The maintenance horse road is an indispensable component for the implementation of the fully enclosed coal bunker. For the fully enclosed coal bunker, its height is generally 20-50 meters, and the lighting lamps are generally arranged longitudinally on both sides of the top of the coal bunker. The top of the silo is high, and there is a coal pile below, so it is impossible to use ladders, lifts, etc. for maintenance. Therefore, the maintenance of horse lanes must be considered in the design to facilitate maintenance problems in future operations. Therefore, the installation of the fire monitor 31 under the horse track 11 is convenient for routine maintenance and inspection, and it is also convenient for workers to control the fire monitor 31 on the spot when a fire is discovered, so as to ensure the timeliness of fire extinguishing.

Specifically, the annular pipe network 23 arranged in a ring shape along the coal shed 10 is provided with a number of maintenance gate valves, and routine maintenance and maintenance of the annular pipe network 23 are facilitated by setting the maintenance gate valves.

As a preferred implementation form, the fire monitors 31 are arranged on the horse lanes 11 on both sides of the ceiling, and the distance between the plurality of fire monitors 31 can ensure that at any point in the room, two water cannons can spray water at the same time. And when a fire is detected, when one of the fire monitors 31 is triggered, the adjacent fire monitors 31 located on the same side of the horse track 11 are also triggered at the same time, and the alarm area is scanned to perform extensive protection to avoid fire. further expansion. As a specific implementation plan, when the installation height of the fire monitor 31 is 30m relative to the 0.00m elevation of the indoor floor of the coal yard, the actual injection flow of the fire monitor 31 is not less than 30L/s, thereby ensuring the fire monitor 31 spray distance.

Specifically, an automatic exhaust valve group 32 , a water flow indicator 34 and an electric valve 33 are also provided at the position where the fire branch pipe 24 communicates with the fire monitor 31 .

Specifically, the dry fire fighting system for a closed coal yard further includes a local control box, and the fire monitor 31 is electrically connected to the local control box. The control of the fire monitor 31 by the on-site control box can facilitate the workers to control the fire monitor 31 on the spot when the fire is discovered, so as to ensure the timeliness of fire extinguishing.

Specifically, the dry fire fighting system for the closed coal yard further includes a wireless remote controller, and the fire monitor 31 is connected to the wireless remote controller in communication. In case of emergency, the fire monitor 31 can be remotely controlled to ensure the timeliness of firefighting, and at the same time, it can ensure that the workers can control the fire monitor from a long distance to ensure safety.

As a variety of realization forms, on the one hand, the dry fire fighting system for a closed coal yard of the present invention can realize a fully automatic fire extinguishing function. When a fire occurs in any area in the closed coal yard, the image flame detector 351 and/or Or the red-ultraviolet flame detector 352 quickly sends alarm information to the fire detection and alarm system. According to the location of the alarm area, the system automatically scans the image to locate and point to the fire source, and starts the fire monitor to put out the fire. On the other hand, the dry fire-fighting system for the closed coal yard of the present invention can realize the function of remote control of fire extinguishing. When the fire detection system in the closed coal yard automatically alarms, after the fire situation is confirmed by the industrial TV monitoring system or manually, the on-duty Through the monitoring system in the control center, the personnel use the centralized control cabinet of the fire monitor to remotely control the fire monitor in the fire area to implement the fire extinguishing function. On the other hand, the dry fire-fighting system for closed coal yard of the present invention can manually control the fire-extinguishing function on site.

5, the fire monitor 31 specifically includes:

an inlet flange 311, the inlet flange 311 is connected with the fire branch pipe 24, and serves as the water inlet of the fire monitor 31;

The gun main body 313, the gun main body 313 serves as the main body part of the fire monitor 31 and is suitable for carrying other components;

The cannon head 315, the cannon head 315 is suitable for spraying the water flow;

The horizontal motor 312 and the vertical motor 317, the horizontal motor 312 and the vertical motor 317 control the angle adjustment of the gun head 315, so as to align the ignition point for spraying;

The mist injection motor 314, the mist injection motor 314 can make the injected water flow infinitely switch between the direct current and the spray state;

A locator 316, the locator 316 is used to locate the fire monitor 31 for easy control.

The fire monitor 31 of the present invention realizes the fire extinguishing work in the closed coal yard through the cooperation of various components, and through communication connection with the flame detection device 35, the local control box, the centralized control cabinet, the monitoring system, etc., to ensure timely sex, safety.

Obviously, the above-mentioned embodiments are only examples for clear description, and are not intended to limit the implementation manner. For those of ordinary skill in the art, changes or modifications in other different forms can also be made on the basis of the above description. There is no need and cannot be exhaustive of all implementations here. And the obvious changes or changes derived from this are still within the protection scope of the present invention.

Claims (10)

1. A dry fire-fighting system for closed coal yard is characterized in that, comprising: An outdoor fire fighting pipeline (40), suitable for laying outdoors; a fire main pipe (20), adapted to be arranged at least partially inside the coal shed (10), and to keep the interior empty in a non-working state; An electric valve (26) is provided near the connection between the outdoor fire fighting pipeline (40) and the fire fighting main pipe (20), and is suitable for connecting the outdoor fire fighting pipeline (40) and the fire fighting main pipe in a working state (20) Conduction. 2. The dry fire-fighting system for closed coal yards according to claim 1, wherein the fire-fighting main pipe (20) comprises: a fire inlet pipe (21), which is laid at the first height and is suitable for being directly or indirectly connected to the outdoor fire fighting pipe (40); an annular pipe network (23), which is laid at the second height and is suitable for direct or indirect connection with the fire protection introduction pipe (21); Wherein, the second height is higher than or equal to the first height. 3. The dry fire-fighting system for a closed coal yard according to claim 2, characterized in that, the annular pipe network (23) is configured as annular pipes connected at the ends. 4. The dry fire fighting system for a closed coal yard according to claim 3, wherein the fire fighting main pipe (20) further comprises a lift pipe (22), and the lift pipe (22) is adapted to The fire-fighting introduction pipe (21) is communicated with the annular pipe network (23). 5. The dry fire fighting system for a closed coal yard according to claim 2, wherein a plurality of fire branch pipes (24) are connected to the annular pipe network (23). 6. The dry fire fighting system for a closed coal yard according to claim 5, characterized in that a fire monitor (31) is connected to the fire branch pipe (24). 7. The dry fire-fighting system for a closed coal yard according to any one of claims 2-6, characterized in that, the annular pipe network (23) is provided with a plurality of exhaust valves (25), the exhaust valves (25) are The air valve (25) is set above the second height. 8. The dry fire-fighting system for a closed coal yard according to any one of claims 2-6, characterized in that, at least one evacuation valve (27) is further provided on the fire-fighting introduction pipe (21), and the The emptying valve (27) is suitable for emptying the fire main pipe (20) after the electric valve (26) is closed. 9. The dry fire fighting system for a closed coal yard according to any one of claims 1-6, wherein the outdoor fire fighting pipes (40) comprise at least two. 10 . The dry fire fighting system for closed coal yards according to claim 6 , wherein the fire monitor ( 31 ) is installed below the horse tracks ( 11 ) on both sides of the central axis of the coal shed ( 10 ). 11 .

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