A fire protection system and method for precise positioning of thermal runaway in a containerized energy storage power station

Abstract

The present invention discloses a fire protection system and method for precise positioning of thermal runaway in a containerized energy storage power station, which consists of an energy storage power station, battery packs pack distributed in an array, and a fire protection system. Each battery pack pack is equipped with a breather safety valve and a fire extinguishing device. The energy storage power station is arranged with a hydrogen sensor array covering the entire area. The breather safety valve exports the hydrogen generated in the initial stage of thermal runaway, and the sensor array monitors the concentration of the whole area in real time. The industrial control computer receives the sensor data, combines the pre-stored spatial distribution information of the battery packs, constructs a gas concentration distribution map, and displays the thermal runaway area on the display screen in real time. After the positioning program analyzes the hydrogen concentration field based on the gas diffusion characteristics and accurately identifies the position of the faulty battery pack, the industrial control computer immediately triggers the fire extinguishing device in the corresponding pack to implement fixed-point fire fighting, forming an early fire extinguishing closed loop. Through multi-sensor data fusion and gas distribution mapping technology, the system realizes the rapid positioning and precise suppression of the thermal runaway source, effectively improving the safety protection level of the energy storage power station.

Description

Technical Field

[0001] The present application relates to the technical field of battery protection, and specifically to a fire protection system and method for precise positioning of thermal runaway in a containerized energy storage power station. Background Art

[0002] At present, lithium-ion energy storage has an absolute share in the field of new energy storage. To ensure high energy density while achieving integration, modularization, and rapid deployment capabilities, lithium-ion energy storage basically adopts a container form. However, in actual applications, due to factors such as overcharging, short circuit, collision, and manufacturing defects, lithium batteries have a risk of thermal runaway. This thermal runaway will quickly spread inside the sealed container, triggering a larger-scale thermal runaway, and ultimately leading to fire and explosion accidents. Therefore, the safety warning and fire protection of containerized energy storage power stations are currently hot research fields.

[0003] At present, the safety warning system of lithium battery energy storage power stations mainly monitors runaway characteristic signals such as temperature, current voltage, combustible gas, and smoke. When the monitored data reaches a preset threshold, the system will send an alarm signal and perform power-off and fire protection processing. This warning method has certain deficiencies: on the one hand, during the thermal runaway of lithium batteries, when the voltage and current mutate and a large amount of combustible gas and smoke appear, the thermal runaway often has entered an uncontrollable stage. Since the battery pack is wrapped in a protective shell, it is also difficult to detect the change in temperature in a timely manner, which results in the inability of the existing warning method to respond in a timely manner at the initial stage of runaway, thus missing the best treatment opportunity. On the other hand, with the improvement of fire protection technology, large-scale energy storage power stations often adopt pack-level fire protection, using aerosol or water to directly pour into the battery pack. This not only tests the response speed of the warning system in terms of time, but also puts forward requirements for the positioning accuracy in terms of space. At present, it is impossible to perform precise positioning only relying on these crude characteristic signals.

[0004] In this context, gas monitoring and warning is one of the relatively good solutions at present. A large number of documents show that certain combustible gases will be generated at the initial stage of lithium battery thermal runaway. These gases are mainly hydrogen. At this time, the lithium battery has not completely thermally run away, there is no high temperature and flame, and the voltage and current have not changed suddenly. Therefore, the monitoring of combustible gas has the fastest response speed. In this case, in order to achieve pack-level positioning, some existing solutions directly install a large number of sensors into the energy storage pack. When a hydrogen signal appears, an alarm signal is sent. This solution also has certain drawbacks: one is that this will cause a large amount of costs, and a large number of sensors and signal receivers will also bring a great cost burden to the product, which is often unacceptable to manufacturers; the second is that hydrogen sensors are often of the electrochemical type, and the electric sparks generated by hydrogen sensors will become the first ignition source in thermal runaway, causing harm to the equipment; the third is that installing sensors inside the pack will occupy a certain amount of space. Summary of the Invention

[0005] To solve the above problems, the object of the present invention is to provide a fire protection system and method for precise positioning of thermal runaway in a containerized energy storage power station. By using technologies such as waterproof breathable membranes, gas sensor arrays, and advanced positioning algorithms, early warning and precise positioning of thermal runaway in the energy storage power station can be achieved without occupying the internal volume of the pack and using fewer gas sensors, ensuring the safety of energy storage equipment.

[0006] According to one aspect of the present application, a fire protection system for precise positioning of thermal runaway in a containerized energy storage power station includes an energy storage power station, a plurality of battery packs (packs) arranged in an array on the energy storage power station, and a fire protection system provided on the energy storage power station. The fire protection system includes a breathable safety valve, a hydrogen sensor, and a fire extinguishing device. A breathable safety valve and a fire extinguishing device are installed on each battery pack (pack). A plurality of hydrogen sensors are arranged in an array on the energy storage power station located in the plane where the breathable safety valve is located to form a hydrogen sensor array. The detection area of the hydrogen sensor array can completely cover the entire plane of the energy storage power station. The breathable safety valve can diffuse the hydrogen generated in the early stage of thermal runaway from the inside of the battery pack (pack). The hydrogen sensor array can detect the concentration of the diffused hydrogen. The setting of the hydrogen sensor array and the breathable safety valve constitutes an early warning system, and the early warning system can monitor the hydrogen concentration in the entire plane of the energy storage power station in real time. The fire protection system further includes an industrial control computer provided on the energy storage power station. The industrial control computer is electrically connected to the hydrogen sensor array and the fire extinguishing device respectively. The industrial control computer is internally provided with a signal processing module and a positioning program. The signal processing module can receive and process the hydrogen concentration data information detected by the hydrogen sensor array. The positioning program is set based on a positioning algorithm. The positioning algorithm uses a gas distribution field reconstruction algorithm. By inputting in advance the spatial distribution information of the battery packs (packs) on the energy storage power station, a gas concentration distribution map is established as the on-site gas distribution image through a gas distribution mapping algorithm for the hydrogen concentration data at each position of the energy storage power station collected by the hydrogen sensor array received by the signal processing module, and is displayed on the display screen of the industrial control computer. The industrial control computer can obtain the position information of the battery packs (packs) located in the thermal runaway area of the energy storage power station through the positioning program and control the fire extinguishing device in the corresponding battery pack (pack) to extinguish the fire, thereby constituting an early fire extinguishing system.

[0007] Preferably, a valve flap in the valve body of the breathable safety valve is sealed, with a hole in the middle and a waterproof breathable membrane installed in the hole.

[0008] Preferably, the fire extinguishing device includes an aerosol fire extinguishing agent and a triggering device. The aerosol fire extinguishing agent and the triggering device are pre-installed inside each battery pack. When the hydrogen sensor array detects thermal runaway in a certain area of the energy storage power station, the industrial control computer obtains the position information of the battery pack located in the thermal runaway area of the energy storage power station through its positioning program, and the industrial control computer controls the triggering device in the battery pack located in the thermal runaway area to trigger the corresponding aerosol fire extinguishing agent to generate a large amount of aerosol for fire extinguishing.

[0009] Preferably, the positioning algorithm uses the Kernel DM+V algorithm to obtain the average distribution and variance distribution of hydrogen concentration on the plane where the hydrogen sensor array is located. The specific steps of the Kernel DM+V algorithm are as follows:

[0010] Step 1: Divide the calculation area into grids and calculate the comprehensive weight distribution and the comprehensive weighted reading distribution :

[0011] ;

[0012] Among them, is the sampling grid, is the gas concentration data on the sampling grid, represents the sampling grid to the estimated grid the distance between the center positions ; represents the Gaussian spatial kernel, represents the kernel width;

[0013] Step 2: Calculate the confidence level at the grid , and the calculation expression is as follows: , where represents the scaling parameter;

[0014] Step 3: Calculate the average concentration estimate value :

[0015] ;

[0016] In the formula is represented by the average value of all sensor readings;

[0017] Step 4: Calculate the weighted variance distribution and the variance estimate distribution :

[0018] ;

[0019] Among them, represents the grid at the position closest to the distance sampling grid The estimated value of the average distribution of gas concentration on the grid, is set as the average value of all variances;

[0020] Step 5: Predict the leakage source through the variance distribution. The high-fluctuation area with prominent variance distribution is usually found near the gas source and can be used to judge whether it is close to the gas source, so as to determine the leakage source position.

[0021] Preferably, the replacement method of the aerosol fire extinguishing agent can also be selected from heptafluoropropane, dual-fluid spray and water flooding.

[0022] A fire-fighting method for precise positioning of thermal runaway of a containerized energy storage power station, comprising the following steps:

[0023] Step 1: Start the hydrogen sensor array to monitor the hydrogen concentration in the entire plane of the energy storage power station. The signal processing module in the industrial control computer of the energy storage power station receives and processes the hydrogen concentration data detected by the hydrogen sensor array, and sets multiple hydrogen concentration thresholds, including the initial alarm hydrogen concentration, the intermediate alarm hydrogen concentration and the high-level alarm hydrogen concentration. When the hydrogen concentration exceeds the intermediate alarm hydrogen concentration, the signal processing module immediately triggers an alarm and sends an alarm message to the industrial control computer, and the industrial control computer automatically starts the positioning program;

[0024] Step 2: Based on the pre-input spatial distribution information of the battery packs (packs) on the energy storage power station, establish a gas concentration distribution map as the on-site gas distribution image for the hydrogen concentration data collected by the hydrogen sensor array received by the signal processing module through the gas distribution mapping algorithm, and display it on the display screen of the industrial control computer. At the same time, the industrial control computer obtains the estimated variance distribution of the hydrogen concentration through the positioning algorithm of the positioning program, finds the grid position with the largest variance estimation distribution value, and sets it as the position coordinate for judging the leakage point;

[0025] Step 3: According to the coordinate position of the hydrogen leakage point obtained by the industrial control computer through the positioning program, automatically turn on the trigger device in the battery pack (pack) within the hydrogen leakage position, and then trigger the corresponding aerosol fire extinguishing agent to generate a large amount of aerosol for fire extinguishing.

[0026] Compared with the prior art, the beneficial effects of the present invention are:

[0027] 1. The present invention monitors the change of hydrogen concentration in real time through a hydrogen sensor array, and can provide timely early warning in the early stage of thermal runaway of the battery pack (pack). Compared with the traditional monitoring methods relying on temperature and smoke, gas monitoring can identify potential safety risks at an earlier time, thereby improving the accuracy and sensitivity of early warning and providing sufficient reaction time for operators;

[0028] 2. By combining hydrogen concentration signal processing and positioning algorithms, the present invention can quickly and accurately locate the position of the thermally runaway battery while installing a small number of sensors. Compared with the solutions using a large number of sensors or manual detection, this system can accurately locate the thermally runaway position in a more economical and faster response manner;

[0029] 3. Through accurate positioning, the present invention can quickly identify the position of the faulty battery, providing great technical support for the realization of accurate fire protection at the pack level. Compared with the previous fire protection method of flooding the entire container with fire extinguishing agents such as heptafluoropropane, the present invention only needs less fire extinguishing agent to flood the specific thermally runaway pack, and at the same time will not damage other battery packs, greatly reducing the economic losses caused by thermal runaway. Description of the Drawings

[0030] Figure 1 is a flowchart of a fire protection method for accurate positioning of thermal runaway in a containerized energy storage power station according to an embodiment of the present application.

[0031] Figure 2 is a schematic installation diagram of a fire protection system for accurate positioning of thermal runaway in a containerized energy storage power station according to an embodiment of the present application.

[0032] Figure 3 is a cloud map of hydrogen gas concentration distribution and positioning for a fire protection system for accurate positioning of thermal runaway in a containerized energy storage power station according to an embodiment of the present application. Detailed Embodiments

[0033] In order to make the content of the present application easier to be clearly understood, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application.

[0034] As Figure 2As shown in the figure, this schematic diagram takes a 20-foot container-type energy storage power station of a certain model as an example. The fire protection system for precise positioning of thermal runaway in this container-type energy storage power station includes an energy storage power station, a number of battery packs pack arranged in an array on the energy storage power station, and a fire protection system provided on the energy storage power station. The fire protection system includes a breather safety valve, a hydrogen sensor, and a fire extinguishing device. A breather safety valve and a fire extinguishing device are installed on each battery pack pack. A plurality of hydrogen sensors are arranged in an array on the energy storage power station located in the plane where the breather safety valve is located to form a hydrogen sensor array. Before installing the hydrogen sensor array, first establish a two-dimensional coordinate system on the plane where the breather safety valve on the energy storage power station is located, and install the hydrogen sensor array on this plane according to the algorithm requirements. It is required that the hydrogen sensor can cover the entire plane while ensuring the positioning accuracy (taking Figure 2 as an example, using a 2*4 sensor array in space), so that the position of the thermal runaway battery can be quickly and accurately located while installing a small number of sensors, and at the same time record the coordinate positions of all breather safety valves and hydrogen sensors on this plane; The breather safety valve is composed of parts such as a valve body, a spring, and a waterproof breathable membrane. The waterproof breathable membrane is a polymer material that can allow a small amount of gas to pass through while preventing water molecules from entering the interior of the battery pack pack. A hole is opened in the middle of the valve flap sealed inside the valve body of the breather safety valve, and a waterproof breathable membrane is installed in the hole. When the internal air pressure of the energy storage power station has not reached the opening pressure of the breather safety valve in the early stage of thermal runaway, the hydrogen generated by its thermal runaway can leak out from the waterproof breathable membrane, so that the external hydrogen sensor can detect hydrogen in the early stage. The setting of the hydrogen sensor array and the breather safety valve constitutes an early warning system, and the early warning system can monitor the hydrogen concentration in the entire plane of the energy storage power station in real time.

[0035] The fire protection system also includes an industrial control computer provided on the energy storage power station. The industrial control computer is electrically connected to the hydrogen sensor array and the fire extinguishing device respectively. The industrial control computer is built-in with a signal processing module and a positioning program. The signal processing module can receive and process the hydrogen concentration data information detected by the hydrogen sensor array. The positioning program is set based on a positioning algorithm. The positioning algorithm uses a gas distribution field reconstruction algorithm. Through the pre-input spatial distribution information of the battery packs pack on the energy storage power station, a gas concentration distribution map is established by the gas distribution mapping algorithm for the hydrogen concentration data at each position of the energy storage power station collected by the hydrogen sensor array received by the signal processing module to serve as the on-site gas distribution image (such as Figure 3As shown in the figure, it is displayed on the display screen of the industrial control computer, and then the scene data is visually displayed; the industrial control computer can obtain the position information of the battery pack located in the thermal runaway area of the energy storage power station through the positioning program and control the fire extinguishing device in the corresponding battery pack to extinguish the fire, thus constituting an early fire extinguishing system. Specifically, the fire extinguishing device includes aerosol fire extinguishing agent and a triggering device. The aerosol fire extinguishing agent and the triggering device are pre-installed inside each battery pack. When the hydrogen sensor array detects thermal runaway in a certain area of the energy storage power station, the industrial control computer obtains the position information of the battery pack located in the thermal runaway area of the energy storage power station through its positioning program, and the industrial control computer controls the triggering device in the battery pack located in the thermal runaway area to trigger the corresponding aerosol fire extinguishing agent to generate a large amount of aerosol for fire extinguishing, thereby suppressing the further deterioration of thermal runaway and buying time for the next step of processing by the staff.

[0036] In one embodiment, the replacement method of the aerosol fire extinguishing agent can also be selected from the methods such as heptafluoropropane, dual-fluid spray, and water flooding.

[0037] In one embodiment, the positioning algorithm uses the Kernel DM+V algorithm to obtain the average distribution and variance distribution of the hydrogen concentration on the plane where the hydrogen sensor array is located, combined with Figure 1 , the specific steps of the Kernel DM+V algorithm are as follows:

[0038] Step 1: Divide the calculation area into grids and calculate the comprehensive weight distribution and the comprehensive weighted reading distribution :

[0039] ;

[0040] Among them, is the sampling grid, is the gas concentration data on the sampling grid, represents the sampling grid to the estimated grid the distance between the center positions , represents the Gaussian spatial kernel, represents the kernel width;

[0041] Step 2: Calculate the confidence level at the grid , and the calculation expression is as follows: , where represents the scaling parameter;

[0042] Step 3: Calculate the average concentration estimate value :

[0043] ;

[0044] In the formula is represented by the average value of all sensor readings;

[0045] Step 4, calculate the weighted variance distribution and the variance estimation distribution :

[0046] ;

[0047] wherein represents the grid nearest to the sampling grid Estimated value of the average distribution of gas concentration on, is set to the average value of all variances;

[0048] Step 5, predict the leakage source through the variance distribution. The high-fluctuation area with prominent variance distribution is usually found near the gas source and can be used to judge whether it is close to the gas source, so as to determine the leakage source location.

[0049] A fire-fighting method for precise positioning of thermal runaway of a containerized energy storage power station, combined with Figure 1 as shown, includes the following steps:

[0050] Step 1, start the hydrogen sensor array to monitor the hydrogen concentration in the entire plane of the energy storage power station. The signal processing module in the industrial control computer of the energy storage power station receives and processes the hydrogen concentration data detected by the hydrogen sensor array, and sets multiple hydrogen concentration thresholds, including 10 ppm as the initial alarm hydrogen concentration; 50 ppm as the intermediate alarm hydrogen concentration (start the fault location program); 100 ppm as the high-level alarm hydrogen concentration (emergency disposal). When the hydrogen concentration exceeds 50 ppm, the signal processing module immediately triggers an alarm and sends an alarm message to the industrial control computer, and the industrial control computer will automatically start the positioning program;

[0051] Step 2, through the pre-entered spatial distribution information of the battery packs pack on the energy storage power station, establish a gas concentration distribution map as the on-site gas distribution image for the hydrogen concentration data collected by the hydrogen sensor array received by the signal processing module through the gas distribution mapping algorithm, and display it through the display screen of the industrial control computer. At the same time, the industrial control computer obtains the variance distribution estimation of the hydrogen concentration through the positioning algorithm of the positioning program, finds the grid position with the largest variance estimation distribution value, and sets it as the position coordinate of the judged leakage point. As Figure 3 shown, the hydrogen leakage position is mainly concentrated in battery packs pack No. 20-22;

[0052] Step 3: According to the coordinate position of the hydrogen leakage point obtained by the industrial control computer, the triggering device in the battery pack pack within the hydrogen leakage position is automatically activated, thereby triggering the corresponding aerosol fire extinguishing agent to generate a large amount of aerosol for fire extinguishing. For example, Figure 3 as shown, if it is determined that the leakage position is the battery pack pack numbered 20-22, the system will automatically open the fire extinguishing devices of the battery pack packs numbered 19-23 to prevent the further spread of thermal runaway.

[0053] The above embodiments are only used to illustrate the technical solutions of the embodiments of the present application, and are not intended to limit them. Although the embodiments of the present application have been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that without departing from the spirit and scope defined by the claims of the present application, they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features.

Claims

1. A fire protection system for accurately locating thermal runaway of a containerized energy storage power station, comprising an energy storage power station, a plurality of battery packs arranged in an array on the energy storage power station, and a fire protection system arranged on the energy storage power station, characterized in that: The fire protection system includes a breathable safety valve, a hydrogen sensor and a fire extinguishing device. Each battery pack is equipped with a breathable safety valve and a fire extinguishing device. A plurality of hydrogen sensors are arrayed on the energy storage power station located on the plane where the breathable safety valve is located to form a hydrogen sensor array. The detection area of ​​the hydrogen sensor array can completely cover the entire plane of the energy storage power station. The breathable safety valve can diffuse the hydrogen generated in the early stage of thermal runaway from the inside of the battery pack. The hydrogen sensor array can detect the concentration of the diffused hydrogen. The hydrogen sensor array and the breathable safety valve constitute an early warning system. The early warning system can monitor the hydrogen concentration in the entire plane of the energy storage power station in real time. The fire protection system also includes an industrial computer. The industrial computer is arranged on the energy storage power station. The industrial computer is electrically connected to the hydrogen sensor array and the fire extinguishing device respectively. The industrial computer can receive and process the hydrogen concentration data information detected by the hydrogen sensor array and control the fire extinguishing device in the battery pack to extinguish the fire. The industrial computer is built with a signal processing module and a positioning program. The signal processing module can receive and process the hydrogen concentration data information detected by the hydrogen sensor array. The positioning program is set based on a positioning algorithm. The positioning algorithm adopts a gas distribution field reconstruction algorithm. Through the spatial distribution information of the battery pack on the energy storage power station input in advance, the hydrogen concentration data of each position of the energy storage power station collected by the hydrogen sensor array received by the signal processing module is used to establish a gas concentration distribution map as an on-site gas distribution image through a gas distribution mapping algorithm, and is displayed through the display screen of the industrial computer. The industrial computer can obtain the position information of the battery pack located in the thermal runaway area of ​​the energy storage power station through the positioning program and control the fire extinguishing device in the corresponding battery pack to extinguish the fire, thereby forming an early fire extinguishing system; The fire extinguishing device includes an aerosol fire extinguishing agent and a trigger device. Each battery pack is pre-installed with an aerosol fire extinguishing agent and a trigger device. When the hydrogen sensor array detects that a certain area of ​​the energy storage power station has thermal runaway, the industrial computer obtains the position information of the battery pack in the thermal runaway area of ​​the energy storage power station through its positioning program. The industrial computer controls the trigger device in the battery pack in the thermal runaway area to trigger the corresponding aerosol fire extinguishing agent to generate a large amount of aerosol for fire extinguishing.

2. According to claim 1, a fire protection system for accurately locating thermal runaway of a containerized energy storage power station is characterized in that: A hole is opened in the middle of the sealed valve flap inside the valve body of the breathable safety valve, and a waterproof breathable membrane is installed in the hole.

3. According to claim 1, a fire protection system for accurately locating thermal runaway of a containerized energy storage power station is characterized in that: The positioning algorithm uses the kernel extrapolation distribution mapping Kernel DM+V algorithm to obtain the average distribution and variance distribution of the hydrogen concentration on the plane where the hydrogen sensor array is located. The specific steps of the Kernel DM+V algorithm are as follows: Step 1: Grid the calculation area and calculate the comprehensive weight distribution and the combined weighted reading distribution : in, is the sampling grid, is the gas concentration data on the sampling grid, Represents the sampling grid To the estimation grid Central location The distance between represents the Gaussian spatial kernel, represents the nuclear width; Step 2: Calculate the grid based on the comprehensive weight distribution Confidence , the calculation expression is as follows: ,in represents the scaling parameter; Step 3: Calculate the average concentration estimate : In the formula Expressed as the average of all sensor readings; Step 4: Calculate the weighted variance distribution and variance estimation distribution : in, Represents the distance sampling grid The nearest grid The estimated average distribution of gas concentration on Set to the mean of all variances; Step 5: Predict the leakage source through variance distribution, where the high fluctuation area with prominent variance distribution is usually found near the gas source, which can be used to determine whether it is close to the gas source, thereby determining the location of the leakage source.

4. According to claim 1, a fire protection system for accurately locating thermal runaway of a containerized energy storage power station is characterized in that: Alternatives to the aerosol fire extinguishing agent include heptafluoropropane, two-fluid spray and water flooding.

5. A firefighting method for accurately locating thermal runaway of a containerized energy storage power station, applied to the firefighting system according to any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1: Start the hydrogen sensor array to monitor the hydrogen concentration in the entire plane of the energy storage power station. The signal processing module in the industrial computer of the energy storage power station receives and processes the hydrogen concentration data detected by the hydrogen sensor array, and sets multiple hydrogen concentration thresholds, including the initial alarm hydrogen concentration, the intermediate alarm hydrogen concentration and the advanced alarm hydrogen concentration. When the hydrogen concentration exceeds the intermediate alarm hydrogen concentration, the signal processing module immediately triggers an alarm and sends an alarm message to the industrial computer, which automatically starts the positioning program. Step 2: Based on the spatial distribution information of the battery packs on the energy storage power station input in advance, the hydrogen concentration data at each location of the energy storage power station collected by the hydrogen sensor array received by the signal processing module is used to establish a gas concentration distribution map as an on-site gas distribution image through a gas distribution mapping algorithm, and the map is displayed on the display screen of the industrial computer. At the same time, the industrial computer obtains the variance distribution estimate of the hydrogen concentration through the positioning algorithm of the positioning program, finds the grid position with the largest variance estimation distribution value, and sets it as the position coordinate of the leakage point; Step 3: The industrial computer automatically activates the trigger device in the battery pack at the hydrogen leakage location according to the coordinate position of the hydrogen leakage point obtained by the positioning program, thereby triggering the corresponding aerosol fire extinguishing agent to produce a large amount of aerosol for fire extinguishing.

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