Gas fire extinguishing system suitable for high and large space places and control method

Abstract

The invention discloses a gas fire extinguishing system suitable for tall and large space places and a control method.The gas fire extinguishing system comprises multiple layers of gas spraying areas which are distributed at intervals in the height direction of a fire extinguishing protection area, and the highest layer of gas spraying area comprises multiple first gas spraying pipes which are connected in a staggered mode and arranged in a net shape; each of the other layers of air injection areas comprises a plurality of second air injection pipes arranged around the fire extinguishing protection area; the gas outlet end of the fire extinguishing device is provided with a master control valve and is connected with a plurality of gas supply pipes, at least two first branch pipes branched from one gas supply pipe are connected with two first gas spraying pipes, a plurality of second branch pipes branched from the other gas supply pipes are correspondingly connected with a plurality of second gas spraying pipes in the same-layer gas spraying area, and each first branch pipe and each second branch pipe are respectively provided with a secondary selection valve; and the plurality of fire monitoring devices are used for monitoring whether a fire occurs in the fire extinguishing protection area or not in real time. According to the invention, uniform fire extinguishing design concentration in all directions can be rapidly formed in a high and large space at the initial stage of a fire, so that the fire extinguishing effect is greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of fire fighting facilities, and more particularly to a gas fire extinguishing system and a control method suitable for large spaces. Background Art

[0002] Large spaces have large volumes and are high, and are often used as industrial plants and intelligent warehouses, such as hazardous chemical warehouses and converter station valve halls. If a fire occurs in a large space, the fire spreads quickly and easily forms a three-dimensional fire, which means that the fire burns vertically and around it at the same time, making firefighting and evacuation extremely difficult.

[0003] At present, for large spaces as fire protection areas, full flooding gas fire extinguishing is usually used. However, the pipe network and nozzles of the existing full flooding gas fire extinguishing system are all set at the top of the fire protection area, which has the following disadvantages:

[0004] 1. The gas fire extinguishing agent cannot quickly fill the entire space in a short period of time, cannot quickly suppress the fire, and the fire extinguishing effect is poor.

[0005] 2. The density of gaseous fire extinguishing agents (such as carbon dioxide fire extinguishing agents) is heavier than that of air. Once released, they will gradually settle at the bottom of the fire protection zone, causing the fire extinguishing agent concentration in the high-level area of ​​the fire protection zone to be lower than the fire extinguishing design concentration, and the full flooding fire extinguishing effect cannot be guaranteed, resulting in poor fire extinguishing effect.

[0006] 3. It is impossible to extinguish fire in local areas, and the fire extinguishing protection is not accurate.

[0007] In summary, how to solve any of the above shortcomings of the existing fire protection pipe network system is an urgent problem to be solved by those skilled in the art. Summary of the invention

[0008] In view of this, the purpose of the present invention is to provide a gas fire extinguishing system suitable for large spaces, which can quickly form a uniform fire extinguishing design concentration in all directions in the large space at the beginning of a fire, thereby greatly improving the fire extinguishing effect.

[0009] Another object of the present invention is to provide a control method for the gas fire extinguishing system suitable for large spaces.

[0010] In order to achieve the above object, the present invention provides the following technical solutions:

[0011] A gas fire extinguishing system suitable for large spaces, used in fire protection areas, including:

[0012] Multiple layers of jet zones are distributed at intervals along the height direction of the fire protection zone, the jet zone at the highest layer comprises a plurality of first jet pipes which are staggered and connected to each other and arranged in a mesh at the top of the fire protection zone, and the jet zones at the remaining layers comprise a plurality of second jet pipes which are arranged around the fire protection zone, and each first jet pipe and each second jet pipe are provided with at least two nozzles;

[0013] A fire extinguishing device is arranged outside the fire extinguishing protection zone, wherein the air outlet of the fire extinguishing device is provided with a master control valve and connected to a plurality of air supply pipes, wherein one of the air supply pipes branches out at least two first branches connected to two spaced first jet pipes, and the remaining air supply pipes all branch out into a plurality of second branches correspondingly connected to a plurality of second jet pipes in the jet zone at the same level, and each of the first branches and each of the second branches is provided with a secondary selection valve;

[0014] A plurality of fire monitoring devices are evenly arranged in the fire protection zone, and are used to monitor in real time whether a fire occurs in the fire protection zone;

[0015] A control device is connected to the master control valve, the plurality of secondary selection valves and the plurality of fire monitoring devices via signals.

[0016] Preferably, at least two fire extinguishing agent concentration monitoring devices are arranged evenly around the center of the fire extinguishing protection zone in each layer of the jet zone, and the fire extinguishing agent concentration monitoring devices are connected to the control device through signals.

[0017] Preferably, at least two oxygen concentration monitoring devices are arranged evenly around the center of the fire protection zone in each layer of the jet zone, and the signals of the oxygen concentration monitoring devices are connected to the control device.

[0018] Preferably, the jet zone at the highest level includes two groups of jet pipes symmetrically centered around the center of the fire protection zone, and each group of the jet pipes includes a plurality of the first jet pipes;

[0019] One of the air supply pipes extends to the center of the fire protection zone and branches out into two pipes extending into the two groups of air injection pipes respectively, and each of the pipes branches out into at least two of the first branch pipes.

[0020] Preferably, the remaining air supply pipes are laid around the fire extinguishing protection zone.

[0021] A gas fire extinguishing control method applicable to a large space is applied to any of the above-mentioned gas fire extinguishing systems applicable to a large space, and the gas fire extinguishing control method comprises:

[0022] Acquire fire monitoring signals from multiple fire monitoring devices;

[0023] When at least two fire monitoring signals reach the preset fire extinguishing threshold at the same time, all secondary selector valves are opened, and then the master control valve is opened. After the preset first spraying time is reached, the master control valve is closed, and then all secondary selector valves are closed.

[0024] Preferably, after reaching the preset first spraying time, closing the master control valve and then closing all the secondary selector valves, the following steps are performed:

[0025] Next, all the secondary selector valves corresponding to the highest jet zone are opened, and then the master control valve is opened. After the preset secondary jetting time is reached, the master control valve is closed, and then the opened secondary selector valves are closed.

[0026] Preferably, after reaching the preset first spraying time, closing the master control valve and then closing all the secondary selector valves, the following steps are performed:

[0027] Next, fire extinguishing agent concentration monitoring signals from a plurality of fire extinguishing agent concentration monitoring devices are obtained;

[0028] When any fire extinguishing agent concentration monitoring signal is lower than the preset fire extinguishing agent concentration threshold, open the secondary selector valve adjacent to the low fire extinguishing agent concentration area, and then open the master control valve. After the preset local spraying time is reached, close the master control valve, and then close the opened secondary selector valve.

[0029] Preferably, after reaching the preset local spraying time, closing the master control valve and then closing the opened secondary selector valve, the following steps are included:

[0030] Acquire fire monitoring signals from multiple fire monitoring devices;

[0031] When any fire monitoring signal reaches the preset fire extinguishing threshold, the secondary selector valve adjacent to the unextinguished area is opened, and then the master control valve is opened. After the preset local fire extinguishing time is reached, the master control valve is closed, and then the opened secondary selector valve is closed;

[0032] When all fire monitoring signals are below the preset fire extinguishing threshold, the following steps are performed within the preset fire extinguishing suppression time period:

[0033] Acquire fire extinguishing agent concentration monitoring signals from multiple fire extinguishing agent concentration monitoring devices, and when any fire extinguishing agent concentration monitoring signal is lower than a preset fire extinguishing agent concentration threshold, open the secondary selection valve adjacent to the low fire extinguishing agent concentration area, and then open the master control valve;

[0034] Oxygen concentration monitoring signals from multiple oxygen concentration monitoring devices are obtained. When any oxygen concentration monitoring signal is higher than a preset oxygen concentration threshold, a secondary selection valve adjacent to an area with high oxygen concentration is opened, and then the master control valve is opened.

[0035] Preferably, after obtaining the fire monitoring signals from the plurality of fire monitoring devices, the method further comprises:

[0036] When only one fire monitoring signal reaches the preset fire extinguishing threshold, an early warning command is sent to the fire monitoring device that sends the abnormal fire monitoring signal, and the fire monitoring device sends a fire early warning sound;

[0037] When the emergency stop signal from the emergency stop button is obtained, a stop warning command is sent to the fire monitoring device that issues the fire warning sound, and the fire monitoring device stops issuing the fire warning sound.

[0038] The gas fire extinguishing system applicable to large spaces provided by the present invention has the following beneficial effects:

[0039] 1. Multiple layers of jet zones are distributed at intervals in the height direction of the fire protection zone, so that the gas fire extinguishing agent can be quickly filled into the fire protection zone in a short time to improve the rapid distribution performance of the fire extinguishing agent.

[0040] 2. The highest jet area is placed at the top of the fire protection area. After the first fire extinguishing spraying in the entire area, the pipe network and nozzles in the highest jet area can be used for secondary fire extinguishing spraying, which can make up for the amount of gas fire extinguishing agent deposited downward in the high-level area, so that the fire extinguishing agent concentration in the high-level area reaches the fire extinguishing design concentration.

[0041] 3. All the jet pipes in the highest jet area can be divided into at least two groups for independent jetting, and each jet pipe in the remaining jet areas can be independently jetted. Therefore, after the first full-area fire extinguishing spraying, the local area in the fire protection area can be sprayed for fire extinguishing, so that the concentration of gas fire extinguishing agent in all spaces of the fire protection area at least reaches the fire extinguishing design concentration.

[0042] 4. All branches branching from the air intake pipe are equipped with selection valves to facilitate the adjustment of the number and time of spraying from the nozzles on the jet pipe, so that the local area fire extinguishing spraying can be accurately controlled.

[0043] 5. The highest jet zone is placed at the top of the fire protection zone, and all jet pipes in the remaining jet zones are arranged around the fire protection zone, saving space and eliminating the need to renovate existing sites, which can reduce the difficulty of arranging and constructing pipelines and nozzles thereon.

[0044] In summary, the present invention can not only realize the full-area fire extinguishing spraying, so that a sufficient amount of gas fire extinguishing agent can quickly fill the fire protection area, but also realize the local area fire extinguishing spraying, so that the concentration of gas fire extinguishing agent in all spaces of the fire protection area can at least reach the fire extinguishing design concentration. Therefore, the present invention can quickly form a uniform fire extinguishing design concentration in all directions in the fire protection area of ​​a large space at the beginning of a fire, thereby greatly improving the fire extinguishing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0046] Figure 1 A schematic diagram of a gas fire extinguishing system suitable for large spaces provided by the present invention;

[0047] Figure 2 It is a partial schematic diagram of the fire protection area;

[0048] Figure 3 It is a partial schematic diagram of the fire extinguishing device;

[0049] Figure 4 for Figure 1 A partial enlarged view of point A in the middle.

[0050] Reference numerals:

[0051] 1-jet area; 11-first jet pipe; 12-second jet pipe; 13-spray nozzle;

[0052] 2-fire extinguishing device; 21-master control valve; 22-main pipeline; 23-air supply pipe; 24-first-stage selection valve; 25-first branch pipe; 26-second branch pipe; 27-second-stage selection valve;

[0053] 3- Fire protection area;

[0054] 4- Fire monitoring device;

[0055] 5- Fire extinguishing agent concentration monitoring device;

[0056] 6-Oxygen concentration monitoring device. DETAILED DESCRIPTION

[0057] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] The core of the present invention is to provide a gas fire extinguishing system suitable for large spaces, which can quickly form a uniform fire extinguishing design concentration in all directions in the large space at the early stage of a fire, thereby greatly improving the fire extinguishing effect.

[0059] Another core of the present invention is to provide a control method for the gas fire extinguishing system suitable for large spaces.

[0060] It should be noted that in this embodiment, the directions or positional relationships indicated by "front", "rear", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present application. In addition, in this specification, relational terms such as first and second are merely used to distinguish one entity from several other entities, and do not necessarily require or imply that there is any such actual relationship or order between these entities.

[0061] The present invention provides a gas fire extinguishing system suitable for large spaces, which is applied to a fire protection area 3 and includes a multi-layer jet area 1, a fire extinguishing device 2, a fire monitoring device 4 and a control device.

[0062] Please refer to Figure 1 and Figure 2 The multiple layers of jet zones 1 are distributed at intervals along the height direction of the fire protection zone 3. The jet zone 1 at the highest layer includes a plurality of first jet pipes 11 which are staggered and connected to each other and arranged in a mesh at the top of the fire protection zone 3. The jet zones 1 at the remaining layers include a plurality of second jet pipes 12 which are arranged around the fire protection zone 3, and each first jet pipe 11 and each second jet pipe 12 are provided with at least two nozzles 13.

[0063] It should be noted that the fire protection zone 3 refers to a closed place where gas fire extinguishing is required, and the fire protection zone 3 of the present application is mainly aimed at large space places, especially the valve hall of the converter station and the hazardous chemical warehouse.

[0064] Please refer to Figure 1 and Figure 2 The highest jet zone 1 has a pipe network structure formed by a plurality of first jet pipes 11 interlaced and connected with each other, and is arranged at the top of the fire protection zone 3. On the one hand, it can avoid large equipment or goods in the fire protection zone 3, which is convenient for layout; on the other hand, the gas fire extinguishing agent can be sprayed downward from the top of the fire protection zone 3, which not only ensures that the fire extinguishing agent concentration in the high-level area reaches the fire extinguishing design concentration, but also facilitates the spraying of three-dimensional fires.

[0065] The remaining jet zones 1 all have a plurality of second jet pipes 12 arranged around the fire protection zone 3. On the one hand, large equipment or goods can be avoided in the fire protection zone 3, which is convenient for layout; on the other hand, by spraying gaseous fire extinguishing agent from the surroundings of the fire protection zone 3 to the central position, the flame can be extinguished from all around, so as to quickly control the spread of the fire and reduce the loss and damage caused by the fire.

[0066] It is understandable that the more layers of the multi-layer jet zones 1 are set, the more conducive it is to evenly diffuse the gas fire extinguishing agent to fill the fire protection zone 3. Therefore, at least three layers of jet zones 1 are set in a large space (that is, the fire protection zone 3).

[0067] It should be noted that, in the case of a large space and the same design concentration of the fire extinguishing agent, arranging five-layer jet zones 1 can make the gas fire extinguishing agent diffuse more evenly than three-layer jet zones 1, but the difference is not large. In order to save engineering cost, the present invention preferably adopts three-layer multi-layer jet zones 1.

[0068] The first air jet pipe 11 and the second air jet pipe 12 are both provided with at least two nozzles 13, and the specific number of the nozzles 13 needs to be set according to the specific length of the air jet pipe.

[0069] The multi-layer jet zone 1 designed as above can release a sufficient amount of gaseous fire extinguishing agent into the fire protection zone 3 in the shortest time and quickly fill the fire protection zone 3 to improve the rapid distribution performance of the fire extinguishing agent, thereby facilitating the effective use of a full flooding fire extinguishing method in large spaces.

[0070] Please refer to Figure 1 The fire extinguishing device 2 is arranged outside the fire protection zone 3. The air outlet end of the fire extinguishing device 2 is provided with a main control valve 21 and connected with a plurality of air supply pipes 23. One air supply pipe 23 branches out at least two first branch pipes 25 connected with two spaced first injection pipes 11. The remaining air supply pipes 23 branch out a plurality of second branch pipes 26 correspondingly connected with a plurality of second injection pipes 12 of the injection zone 1 on the same floor, and each first branch pipe 25 and each second branch pipe 26 are provided with a secondary selection valve 27.

[0071] It should be noted that, since there are many hazardous chemicals that react with water to cause explosion or fire during fire extinguishing, gas fire extinguishing agents generally use inert gases with more stable chemical properties for fire extinguishing, such as the most commonly used carbon dioxide. In addition, the fire extinguishing device 2 uses a constant pressure storage high-pressure gas fire extinguishing agent to enable rapid release of the gas fire extinguishing agent and ensure safe and stable transportation or storage of the gas fire extinguishing agent. Therefore, the present invention can use a constant pressure storage type high-pressure carbon dioxide fire extinguishing device 2. The specific structure of the device can refer to the prior art, which is not the focus of the present invention and will not be described in detail herein.

[0072] In addition, the fire extinguishing device 2 is arranged outside the fire extinguishing protection zone 3 to avoid leakage or accidental release of the fire extinguishing device 2 and thus threaten the safety of the operating personnel and equipment.

[0073] Please refer to Figure 1 and Figure 3The air outlet end of the fire extinguishing device 2 is connected to a main pipeline 22, on which a master control valve 21 is provided, and the main pipeline 22 branches out a plurality of air supply pipes 23, the number of which is consistent with the number of the multi-layer jet zones 1.

[0074] Among them, an air supply pipe 23 extends to the highest level jet zone 1 and branches out into at least two first branch pipes 25. The two first branch pipes 25 are correspondingly connected to two non-adjacent first jet pipes 11, and each first branch pipe 25 is provided with a secondary selection valve 27. Since the secondary selection valve 27 has the function of controlling the on-off of the pipeline, the highest level jet zone 1 is divided into at least two local jet zones, and fire extinguishing spraying operations can be carried out independently.

[0075] The remaining air supply pipes 23 correspond to the remaining jet zones 1 one by one. The air supply pipes 23 extend the corresponding jet zones 1 and branch out into a plurality of second branch pipes 26. The number of the plurality of second branch pipes 26 is the same as the number of the plurality of second jet pipes 12. The second branch pipes 26 are connected to the second jet pipes 12, and each second branch pipe 26 is provided with a secondary selection valve 27. Figure 2 As shown, since the secondary selector valve 27 has the function of controlling the on-off of the pipeline, each second jet pipe 12 of each jet zone 1 can jet independently, that is, the remaining jet zones 1 can be divided into multiple local jet zones, and can perform fire extinguishing and spraying operations independently.

[0076] The multi-layer jet zone 1 adopts the above-mentioned setting method to intake air. On the one hand, each jet zone 1 has a local jet zone, which can realize local fire extinguishing spraying in the fire extinguishing protection zone 3, so that the concentration of the gas fire extinguishing agent in all spaces of the fire extinguishing protection zone 3 at least reaches the fire extinguishing design concentration, effectively avoiding the problem of poor fire extinguishing effect caused by the sinking of the gas fire extinguishing agent; on the other hand, each local jet zone corresponds to a secondary selector valve 27 with adjustable pressure and flow, which is conducive to the precise and controllable fire extinguishing spraying in the local area.

[0077] Please refer to Figure 1 A plurality of fire monitoring devices 4 are evenly arranged in the fire protection zone 3 for real-time monitoring of whether a fire occurs in the fire protection zone 3 .

[0078] It should be noted that the type of fire monitoring device 4 can be adaptively selected according to the fire extinguishing design requirements of the place. For example, in a place where a lot of smoke is generated in the early stage of a fire, the fire monitoring device 4 is preferably an image-type smoke fire monitoring device 4, which can detect early fire smoke to quickly respond and send out a fire alarm signal. Of course, the fire monitoring device 4 can also be an infrared smoke fire monitoring device 4 or an aspirated smoke fire monitor, etc., and the type is not unique.

[0079] The specific arrangement of the multiple fire monitoring devices 4 is preferably as follows: multiple layers of detection areas are arranged at intervals in the height direction of the fire extinguishing protection zone 3, and each layer of detection area has multiple fire monitoring devices 4 evenly arranged around the fire extinguishing protection zone 3, so that the multiple fire monitoring devices 4 are evenly arranged in the fire extinguishing protection zone 3, thereby avoiding the generation of detection dead zones in the fire extinguishing protection zone 3 and causing untimely fire extinguishing.

[0080] The control device is signal-connected to the main control valve 21 , a plurality of secondary selector valves 27 and a plurality of fire monitoring devices 4 .

[0081] The fire monitoring device 4 is connected to the control device via an electrical wire signal to transmit the fire monitoring signal to the control device in real time. The control device compares the fire monitoring signal fed back by the fire monitoring device 4 with the preset fire extinguishing threshold according to a preset control algorithm, and controls the opening and closing of the main control valve 21 and the secondary selection valve 27 according to the comparison result, thereby realizing intelligent full-area fire extinguishing control.

[0082] Considering how to accurately and effectively achieve local fire extinguishing, based on the above embodiments, please refer to Figure 1 and Figure 2 At least two fire extinguishing agent concentration monitoring devices 5 are evenly arranged around the center of the fire protection zone 3 in each jet zone 1, and the fire extinguishing agent concentration monitoring devices 5 are connected to the control device by signals.

[0083] Specifically, at least two fire extinguishing agent concentration monitoring devices 5 are provided and evenly arranged at the center of the fire extinguishing protection zone 3, for real-time monitoring of the fire extinguishing agent concentration in each local area of ​​each layer of the jet zone 1. Thus, after completing the secondary fire extinguishing spraying operation, multiple local sprayings can be performed according to the fire extinguishing agent concentration in the local area, so that the gas fire extinguishing agent concentration in all spaces of the fire extinguishing protection zone 3 at least reaches the fire extinguishing design concentration.

[0084] It should be noted that after the system completes the fire extinguishing spraying, it is necessary to maintain a certain fire suppression time in the fire protection zone 3. This fire suppression time refers to the time required to maintain the designed concentration of the fire extinguishing agent in the fire protection zone 3 so that the solid deep-seated fire is completely extinguished. During the fire suppression time, if the oxygen concentration in the fire protection zone 3 is too high or the concentration of the gas fire extinguishing agent is too low, the fire will rekindle.

[0085] In order to avoid the phenomenon of fire re-ignition in the fire protection zone 3, there are the following two implementation methods:

[0086] In one embodiment, during a preset fire extinguishing suppression time period, the fire extinguishing agent concentration monitoring device 5 monitors the fire extinguishing agent concentration of each local area in the jet zone 1 in real time. If the fire extinguishing agent concentration is lower than a preset fire extinguishing agent concentration threshold, the secondary selection valve 27 adjacent to the low fire extinguishing agent concentration area is opened, and then the main control valve 21 is opened to replenish gaseous fire extinguishing agent to the low fire extinguishing agent concentration area to prevent re-ignition of the fire in the low fire extinguishing agent concentration area.

[0087] In another embodiment, please refer to Figure 1 and Figure 2 At least two oxygen concentration monitoring devices 6 are evenly arranged around the center of the fire protection zone 3 in each jet zone 1, and the oxygen concentration monitoring devices 6 are connected to the control device by signals.

[0088] Thus, the oxygen concentration monitoring device 6 is used to monitor the concentration of the fire extinguishing agent in each local area of ​​each jet zone 1 in real time. During the preset fire suppression time period, the oxygen concentration monitoring device 6 monitors the oxygen concentration in each local area of ​​each jet zone 1 in real time. If the oxygen concentration is higher than the preset oxygen concentration threshold, the selection valve adjacent to the high oxygen concentration area is opened to replenish the gas fire extinguishing agent to the high oxygen concentration area, so as to prevent the re-ignition of the high oxygen concentration area by reducing the oxygen concentration.

[0089] Regarding the specific arrangement of the air supply pipe 23 corresponding to the highest jet zone 1, based on the above embodiment, please refer to Figure 1 and Figure 2 The top jet zone 1 includes two groups of jet pipes symmetrically centered on the center of the fire protection zone 3, each group of jet pipes has multiple first jet pipes 11; an air supply pipe 23 extends to the center of the fire protection zone 3 and branches out into two pipes that extend into the two groups of jet pipes respectively, and each pipe branches out into at least two first branch pipes 25.

[0090] Specifically, the two groups of jet pipes are symmetrical with the center position of the fire protection zone 3 as the center, and each group of jet pipes has a plurality of first jet pipes 11, and the plurality of first jet pipes 11 are staggered and connected to each other and arranged in a mesh. Thus, a bilaterally symmetrical pipe network structure can be set at the top of the fire protection zone 3 to cover the entire top area of ​​the fire protection zone 3 as much as possible, which is conducive to improving the fire extinguishing effect. In addition, an air supply pipe 23 extends to the center of the fire protection zone 3 and branches into two pipelines, one pipeline extends to the left into the left pipe network structure and branches into at least two first branch pipes 25, the two first branch pipes 25 are arranged along the front-to-back direction to connect the two first injection pipes 11, and the other pipeline extends to the right into the right pipe network structure and branches into at least two first branch pipes 25, the two first branch pipes 25 are arranged along the front-to-back direction to connect the two first injection pipes 11, and each first branch pipe 25 is provided with a secondary selection valve 27, thereby, the highest level injection zone 1 is divided into at least four local injection zones, which are evenly arranged at the top of the fire protection zone 3, which is conducive to the rapid and uniform distribution of the gas fire extinguishing agent in the high-level area.

[0091] Regarding the specific arrangement of the air delivery pipes 23 corresponding to the remaining layers of the jet zone 1, based on the above embodiment, please refer to Figure 1 The remaining air supply pipes 23 are extended to the corresponding jet area 1 and surround the periphery of the fire protection area 3, saving space and facilitating layout, especially in built places with large equipment.

[0092] Optional, please refer to Figure 2 One end of the air supply pipe 23 corresponding to the jet zone 1 on the highest floor is connected to the main pipeline 22 through a first-stage selector valve 24, and the other end extends to the center of the jet zone 1 on the highest floor and extends into the fire protection zone 3. Both ends of the air supply pipes 23 corresponding to the jet zones 1 on the remaining floors are connected to the main pipeline 22 through a first-stage selector valve 24.

[0093] The primary selector valve 24 and the secondary selector valve 27 both have the function of controlling the on-off of the pipeline. Figure 3 and Figure 4 As shown, the secondary selector valve 27 is arranged on the first branch pipe 25 or the second branch pipe 26 branched from the air supply pipe 23, and the primary selector valve 24 is arranged on the air supply pipe 23 and is located between the master control valve 21 and the secondary selector valve 27. If a fire extinguishing and spraying operation in a local jet zone is to be realized, on the basis of opening the master control valve 21, the primary selector valve 24 and the secondary selector valve 27 corresponding to the local jet zone are opened. Therefore, the two-stage valve setting can prevent misoperation and can also prevent gas backflow.

[0094] Regarding the specific setting method of the control device, on the basis of any of the above embodiments, the control device includes a control panel and an automatic button, a manual button and an emergency stop button arranged thereon.

[0095] Among them, the automatic button is the start and stop button for the system to realize automatic fire extinguishing operation. If the automatic button is pressed, the system will automatically perform fire extinguishing operation according to preset conditions without human intervention.

[0096] The automatic fire extinguishing operation may cause a false alarm of fire by the fire monitoring device 4. If the fire monitoring device 4 issues a fire warning or the fire extinguishing device 2 has already started the jet fire extinguishing before the false alarm is discovered, the fire extinguishing program can be interrupted by the emergency stop button. It should be noted that the emergency stop button can also be set at the door of the fire protection area 3 to facilitate timely operation by the on-site staff.

[0097] The manual button is the start / stop button for the system to implement manual fire extinguishing operation. Specifically, when a fire occurs in the fire protection area 3, the controller in the control panel obtains an abnormal fire monitoring signal. After confirmation by the on-site personnel, if the manual button is pressed, the fire extinguishing device 2 can be started through the controller to implement fire extinguishing. The above-mentioned manual control fire extinguishing operation can be confirmed by the on-site personnel, so the jet fire extinguishing can be started only when the fire is confirmed and the personnel have completed evacuation.

[0098] The present invention also provides a gas fire extinguishing control method applicable to large spaces, which is applied to the gas fire extinguishing system applicable to large spaces disclosed in the above embodiment, and the specific steps include:

[0099] S1: Obtain fire monitoring signals from multiple fire monitoring devices;

[0100] S2: When at least two fire monitoring signals reach the preset fire extinguishing threshold at the same time, open all secondary selector valves, then open the master control valve, after reaching the preset first spraying time, close the master control valve, and then close all secondary selector valves.

[0101] It should be noted that if the optional primary selector valve is used, then in this step, when all secondary selector valves are opened, the primary selector valve also needs to be opened. Correspondingly, when all secondary selector valves are closed, all primary selector valves also need to be closed.

[0102] If at least two fire monitoring devices send an abnormal fire monitoring signal to the control device (i.e., greater than or equal to the preset fire extinguishing threshold), it means that a fire has occurred in the fire protection zone, which can prevent the fire monitoring device from giving a false alarm.

[0103] The preset fire extinguishing threshold can be adaptively selected by the user according to the actual situation. For example, if the fire monitoring device is a temperature-sensitive fire and smoke monitoring device, the preset fire extinguishing threshold can be set according to the dangerous temperature of the dangerous chemicals or electrical equipment in the fire protection area. When the monitoring temperature reaches the dangerous temperature, the control device determines to start the fire extinguishing procedure. In addition, the preset first initial spraying time can be obtained by quantitative fire simulation of dangerous chemical flat warehouses and stereoscopic warehouses, etc., to obtain the time when the fire enters the stage of rapid development to full combustion, and this time is set as the full-area fire extinguishing setting time, so as to fully extinguish the fire before the fire develops to the stage of full combustion.

[0104] Therefore, after executing the above step S2, a sufficient amount of gas fire extinguishing agent can be sprayed into the fire protection zone, and the gas fire extinguishing agent quickly fills the fire protection zone, so that the entire space of the fire protection zone reaches the required fire extinguishing design concentration at the initial stage of the fire.

[0105] It should be noted that since the density of gaseous fire extinguishing agents (such as carbon dioxide fire extinguishing agents) is heavier than that of air, once released, it will gradually settle at the bottom of the fire protection zone, causing the fire extinguishing agent concentration in the high-level area of ​​the fire protection zone to be lower than the fire extinguishing design concentration, and the full flooding fire extinguishing effect cannot be guaranteed, and the fire extinguishing effect is poor.

[0106] In order to solve the problem that the fire extinguishing agent in the high-level area is deposited downwards and causes poor fire extinguishing effect, there are two implementation methods:

[0107] In the first embodiment, after executing the above step S2, the method further includes:

[0108] S3: Next, all the secondary selector valves corresponding to the highest jet zone are opened, and then the master control valve is opened. After the preset local jetting time is reached, the master control valve is closed, and then the opened secondary selector valves are closed.

[0109] It should be noted that if the optional primary selector valve is used, in this step, when all the secondary selector valves corresponding to the highest jet zone are opened, the primary selector valve corresponding to the highest jet zone also needs to be opened. Correspondingly, when the opened secondary selector valve is closed, the opened primary selector valve also needs to be closed.

[0110] Therefore, after executing the above step S3, the amount of gas fire extinguishing agent deposited downward in the high-level area can be compensated, so that the fire extinguishing agent concentration in the high-level area reaches the fire extinguishing design concentration, thereby improving the fire extinguishing effect.

[0111] In the second embodiment, after executing the above step S2, the method further includes:

[0112] S4: Next, obtaining fire extinguishing agent concentration monitoring signals of multiple fire extinguishing agent concentration monitoring devices;

[0113] S5: When any fire extinguishing agent concentration monitoring signal is lower than the preset fire extinguishing agent concentration threshold, open the secondary selector valve adjacent to the low fire extinguishing agent concentration area, and then open the master control valve. After the preset secondary spraying time is reached, close the master control valve, and then close the opened secondary selector valve.

[0114] It should be noted that if the optional primary selector valve is used, then in this step, when the secondary selector valve adjacent to the area with low extinguishing agent concentration is opened, the primary selector valve corresponding to the jetting area adjacent to the area with low extinguishing agent concentration needs to be opened. Accordingly, when the opened secondary selector valve is closed, the opened primary selector valve also needs to be closed.

[0115] If any fire extinguishing agent concentration monitoring device sends an abnormal fire extinguishing agent concentration signal to the control device (lower than the preset fire extinguishing agent concentration threshold), it means that the fire extinguishing agent concentration near the fire extinguishing agent concentration monitoring device is too low, then the secondary selector valve adjacent to the low fire extinguishing agent concentration area is opened, and then the master control valve is opened, so that the gas fire extinguishing agent can be added to the low fire extinguishing agent concentration area. After the preset secondary spraying time is reached, the master control valve is closed, and then the opened secondary selector valve is closed. The above-mentioned preset secondary spraying time should be shorter than the preset first spraying time, for example, the first spraying time is 60s and the second spraying time is 30s.

[0116] Therefore, even if the gas fire extinguishing agent in the top area of ​​the fire extinguishing protection zone sinks to the bottom, after executing the above steps S4 and S5, at the initial stage of a fire, the concentration of the gas fire extinguishing agent in all spaces of the fire extinguishing protection zone can at least reach the fire extinguishing design concentration. That is to say, at the initial stage of a fire, a uniform fire extinguishing design concentration can be quickly formed in the fire extinguishing protection zone of a large space, which is beneficial to greatly improve the fire extinguishing effect.

[0117] The first embodiment described above can achieve the fire extinguishing agent concentration in the high-level area to reach the fire extinguishing design concentration without the help of the fire extinguishing agent concentration monitoring device, and has the advantages of simple operation logic and cost saving. The second embodiment described above can accurately and effectively achieve local fire extinguishing spraying with the help of the fire extinguishing agent concentration monitoring device, and has the advantages of saving fire extinguishing agent while ensuring that the gas fire extinguishing agent concentration in all spaces in the fire protection area reaches the fire extinguishing design concentration. Users can choose one of the above two embodiments according to actual working conditions.

[0118] After the second local fire extinguishing spraying operation is completed, it is necessary to determine whether the fire extinguishing is successful. Therefore, after step S3 or step S5, the following steps are also included:

[0119] S6: Obtaining fire monitoring signals from multiple fire monitoring devices;

[0120] S7: When any fire monitoring signal reaches the preset fire extinguishing threshold, the secondary selector valve adjacent to the unextinguished area is opened, and then the master control valve is opened. After the preset local fire extinguishing time is reached, the master control valve is closed, and then the opened secondary selector valve is closed;

[0121] It should be noted that if the optional primary selector valve is used, in this step, while the secondary selector valve of the unextinguished area is opened, the primary selector valve corresponding to the jet layer adjacent to the unextinguished area needs to be opened. Accordingly, while closing the opened secondary selector valve, the opened primary selector valve also needs to be closed.

[0122] If after the second local fire extinguishing spraying operation is completed, the fire monitoring device still sends an abnormal fire monitoring signal to the control device, indicating that the fire extinguishing in the area near the fire monitoring device has failed, and the local area still needs to be extinguished. Specifically, open the secondary selection valve adjacent to the unextinguished area, and then open the master control valve to spray the gas fire extinguishing agent to the unextinguished area. After reaching the preset local fire extinguishing time, the master control valve can be closed, and then the opened secondary selection valve is closed to end the third local fire extinguishing spraying operation, and then jump to the above step S6 to continue to determine whether the fire extinguishing is successful, otherwise continue to execute step S7, perform the fourth or even multiple local fire extinguishing spraying operations, until the fire is successfully extinguished and enter the following step S8.

[0123] S8: When all fire monitoring signals are lower than the preset fire extinguishing threshold, the following steps are performed within the preset fire extinguishing suppression time period:

[0124] S81: acquiring fire extinguishing agent concentration monitoring signals from a plurality of fire extinguishing agent concentration monitoring devices, and when any fire extinguishing agent concentration monitoring signal is lower than a preset fire extinguishing agent concentration threshold, opening a secondary selection valve adjacent to a low fire extinguishing agent concentration area, and then opening a master control valve;

[0125] It should be noted that if the optional primary selector valve is used, then in this step, while opening the secondary selector valve in the area with low extinguishing agent concentration, the primary selector valve corresponding to the jet layer adjacent to the area with low extinguishing agent concentration also needs to be opened.

[0126] If all fire monitoring signals do not send abnormal fire extinguishing agent concentration monitoring signals to the control device, it means that the system has successfully extinguished the fire. In order to prevent the system from reigniting within the preset fire suppression time period, the above step S81 is executed. Specifically, if any fire extinguishing agent concentration monitoring device sends an abnormal fire extinguishing agent concentration signal (lower than the preset fire extinguishing agent concentration threshold) to the control device, it means that the fire extinguishing agent concentration in the vicinity of this fire extinguishing agent concentration monitoring device is too low. The secondary selection valve adjacent to the area with too low fire extinguishing agent concentration is opened, and then the main control valve is opened, so that the gas fire extinguishing agent can be added to the area with low fire extinguishing agent concentration to prevent the area with low fire extinguishing agent concentration from reigniting.

[0127] S82: Obtain oxygen concentration monitoring signals from a plurality of oxygen concentration monitoring devices. When any oxygen concentration monitoring signal is higher than a preset oxygen concentration threshold, open the secondary selection valve adjacent to the high oxygen concentration area, and then open the master control valve.

[0128] It should be noted that if the optional primary selector valve is used, then in this step, while opening the secondary selector valve adjacent to the high oxygen concentration area, the primary selector valve corresponding to the jet layer adjacent to the high oxygen concentration area also needs to be opened.

[0129] In order to prevent the system from reigniting within the preset fire extinguishing suppression time period, the above step S82 can also be executed in parallel. Specifically, if any oxygen concentration monitoring device sends an abnormal oxygen concentration signal (higher than the preset oxygen concentration threshold) to the control device, it means that the oxygen concentration in the area near this fire extinguishing agent concentration monitoring device is too high. The secondary selection valve adjacent to the high oxygen concentration area is opened, and then the main control valve is opened. Gas fire extinguishing agent can be added to the high oxygen concentration area to prevent the reignition of the high oxygen concentration area by reducing the oxygen concentration.

[0130] Either of the above steps S81 and 82 can prevent the fire from reigniting in the fire protection zone. The two steps can be performed simultaneously, one by one, or even one at a time.

[0131] After executing the above step S1, the following steps are also included:

[0132] S11: When only one fire monitoring signal reaches the preset fire extinguishing threshold, an early warning command is sent to the fire monitoring device that sends out the abnormal fire monitoring signal, and the fire monitoring device sends out a fire early warning sound.

[0133] It should be noted that if only one fire monitoring device sends an abnormal fire monitoring signal to the control device, the control device controls the fire monitoring device to issue a fire warning sound. On the one hand, if the on-site personnel confirm that a fire has occurred, the safe evacuation of personnel in the fire protection area can be ensured before the fire spreads. On the other hand, if the on-site personnel confirm that no fire has occurred, they can stop the evacuation in time and manually turn on the emergency stop button to interrupt the fire warning sound of the fire monitoring device.

[0134] Furthermore, after executing the above step S11, the method further includes:

[0135] S12: When an emergency stop signal from the emergency stop button is obtained, a stop warning command is sent to the fire monitoring device that issues the fire warning sound, and the fire monitoring device stops issuing the fire warning sound.

[0136] Therefore, on-site staff can stop the fire warning sound in time by pressing the emergency stop button at the entrance of the fire protection area, avoiding false alarms that may cause panic to staff and material losses.

[0137] In the above step S2, after at least two fire monitoring signals simultaneously reach the preset fire extinguishing threshold, before opening all the secondary selector valves, the following steps are also included:

[0138] S21: Send a fire alarm command to the fire monitoring device that sends out an abnormal fire monitoring signal. The fire monitoring device sends out a fire alarm sound. After the preset delay time is reached, all secondary selection valves and the main control valve are opened.

[0139] It should be noted that if the optional primary selector valve described above is used, then in this step, all the secondary selector valves and the master control valve are opened while all the primary selector valves are opened.

[0140] If at least two fire monitoring devices send abnormal fire monitoring signals to the control device, it means that a fire has indeed occurred in the fire protection zone. Before performing the fire extinguishing operation, control one or both of the two fire monitoring devices to send out a fire alarm sound. After the preset delay time is reached, the preset delay time can be set according to the specific conditions of the large space, generally not more than 30s, and then open all the secondary selection valves and the main control valve, and execute the remaining operations in step S2 to realize the first fire extinguishing spraying operation.

[0141] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0142] The above is a detailed introduction to a gas fire extinguishing system and control method suitable for large spaces provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A gas fire extinguishing system suitable for large spaces, used in fire protection areas (3), characterized in that: include: Multiple layers of jet zones (1) are spaced apart along the height direction of the fire protection zone (3), the jet zone (1) at the highest layer comprises a plurality of first jet pipes (11) which are interlaced and connected to each other and arranged in a network at the top of the fire protection zone (3), and the jet zones (1) at the remaining layers comprise a plurality of second jet pipes (12) which are arranged around the fire protection zone (3), and each first jet pipe (11) and each second jet pipe (12) are provided with at least two nozzles (13); A fire extinguishing device (2) is arranged outside the fire extinguishing protection zone (3), wherein a main control valve (21) is provided at an air outlet end of the fire extinguishing device (2) and is connected to a plurality of air supply pipes (23), wherein one of the air supply pipes (23) branches out into at least two first branch pipes (25) connected to two first jetting pipes (11) spaced apart from each other, and the remaining air supply pipes (23) each branch out into a plurality of second branch pipes (26) correspondingly connected to a plurality of second jetting pipes (12) of the jetting zone (1) at the same level, and each of the first branch pipes (25) and each of the second branch pipes (26) is provided with a secondary selection valve (27); A plurality of fire monitoring devices (4) are evenly arranged in the fire extinguishing protection zone (3) and are used to monitor in real time whether a fire occurs in the fire extinguishing protection zone (3); A control device, signal-connected to the master control valve (21), the plurality of secondary selection valves (27) and the plurality of fire monitoring devices (4).

2. The gas fire extinguishing system suitable for large spaces according to claim 1 is characterized in that: At least two fire extinguishing agent concentration monitoring devices (5) are evenly arranged around the center of the fire extinguishing protection zone (3) in the jetting area (1) of each layer, and the fire extinguishing agent concentration monitoring devices (5) are connected to the control device through signals.

3. The gas fire extinguishing system suitable for large spaces according to claim 1 is characterized in that: At least two oxygen concentration monitoring devices (6) are evenly arranged around the center of the fire protection zone (3) in the jet zone (1) of each floor, and the oxygen concentration monitoring devices (6) are connected to the control device through signals.

4. The gas fire extinguishing system suitable for large spaces according to claim 1 is characterized in that: The jet zone (1) at the top layer comprises two groups of jet pipes symmetrically centered around the center of the fire protection zone (3), and each group of the jet pipes comprises a plurality of the first jet pipes (11); One of the air supply pipes (23) extends to the center of the fire protection zone (3) and branches into two pipes that extend into the two groups of air injection pipes respectively, and each of the pipes further branches into at least two of the first branch pipes (25).

5. The gas fire extinguishing system suitable for large spaces according to claim 1 is characterized in that: The remaining air supply pipes (23) are all laid around the fire extinguishing protection zone (3).

6. A gas fire extinguishing control method suitable for large spaces, characterized in that: The gas fire extinguishing system applicable to large spaces as described in any one of claims 1 to 5 above, wherein the gas fire extinguishing control method comprises: Acquire fire monitoring signals from multiple fire monitoring devices; When at least two fire monitoring signals reach the preset fire extinguishing threshold at the same time, all secondary selector valves are opened, and then the master control valve is opened. After the preset first spraying time is reached, the master control valve is closed, and then all secondary selector valves are closed.

7. The gas fire extinguishing control method applicable to large spaces according to claim 6, characterized in that: After the preset first spray time is reached, close the main control valve and then close all secondary selector valves, including: Next, all the secondary selector valves corresponding to the highest jet zone are opened, and then the master control valve is opened. After the preset secondary jetting time is reached, the master control valve is closed, and then the opened secondary selector valves are closed.

8. The gas fire extinguishing control method applicable to large spaces according to claim 6 is characterized in that: After the preset first spray time is reached, close the main control valve and then close all secondary selector valves, including: Next, fire extinguishing agent concentration monitoring signals from a plurality of fire extinguishing agent concentration monitoring devices are obtained; When any fire extinguishing agent concentration monitoring signal is lower than the preset fire extinguishing agent concentration threshold, open the secondary selector valve adjacent to the low fire extinguishing agent concentration area, and then open the master control valve. After the preset local spraying time is reached, close the master control valve, and then close the opened secondary selector valve.

9. The gas fire extinguishing control method applicable to large spaces according to claim 7 or 8, characterized in that: After the preset local spraying time is reached, close the main control valve, and then close the opened secondary selector valve, including: Acquire fire monitoring signals from multiple fire monitoring devices; When any fire monitoring signal reaches the preset fire extinguishing threshold, the secondary selector valve adjacent to the unextinguished area is opened, and then the master control valve is opened. After the preset local fire extinguishing time is reached, the master control valve is closed, and then the opened secondary selector valve is closed; When all fire monitoring signals are below the preset fire extinguishing threshold, the following steps are performed within the preset fire extinguishing suppression time period: Acquire fire extinguishing agent concentration monitoring signals from multiple fire extinguishing agent concentration monitoring devices, and when any fire extinguishing agent concentration monitoring signal is lower than a preset fire extinguishing agent concentration threshold, open the secondary selection valve adjacent to the low fire extinguishing agent concentration area, and then open the master control valve; Oxygen concentration monitoring signals from multiple oxygen concentration monitoring devices are obtained. When any oxygen concentration monitoring signal is higher than a preset oxygen concentration threshold, a secondary selection valve adjacent to an area with high oxygen concentration is opened, and then the master control valve is opened.

10. The gas fire extinguishing control method applicable to large spaces according to claim 6, characterized in that: After obtaining the fire monitoring signals of the plurality of fire monitoring devices, the method further includes: When only one fire monitoring signal reaches the preset fire extinguishing threshold, an early warning command is sent to the fire monitoring device that sends the abnormal fire monitoring signal, and the fire monitoring device sends a fire early warning sound; When the emergency stop signal from the emergency stop button is obtained, a stop warning command is sent to the fire monitoring device that issues the fire warning sound, and the fire monitoring device stops issuing the fire warning sound.

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