External passive fire-fighting device for water plant energy storage system

Abstract

The invention discloses an external passive fire-fighting device for an energy storage system of a water plant, comprising: a closed water sump which comprises a closed space for accommodating an energy storage device and is provided with a water outlet and a liquid level meter; the fire-fighting water channel is provided with a first end communicated with the pool structure and a second end communicated with the closed water sump, the first end is higher than the second end, a first valve connected with the liquid level meter is arranged near the first end, and a second valve with an automatic temperature sensing function is arranged at the second end. Treatment water in a water plant production process is directly utilized for fire fighting and extinguishing, reasonable and full utilization of water resources is achieved, fire protection measures can be rapidly started under the emergency situation that a fire happens to the energy storage device, safety accidents are prevented, and the energy storage device is safe and reliable. Safe and stable operation of a water plant pool structure after photovoltaic and energy storage technologies are introduced is comprehensively guaranteed, effective guarantee is provided for green, low-carbon, safe and efficient operation of a water plant, and powerful safety guarantee is provided for green transformation and sustainable development of the water plant; the method has reliability and stability, can adapt to the conditions of energy storage capacity expansion and the like, and is high in universality.

Description

Technical Field

[0001] The present invention belongs to the technical field of plant fire protection, and in particular relates to an external passive fire protection device for a water plant energy storage system. Background Art

[0002] When discussing the energy efficiency improvement strategy of water plants, a significant challenge lies in its high energy consumption characteristics. In order to meet this challenge, the water industry is actively seeking innovative solutions, one of which is to place the photovoltaic system above the water plant pool structure. Specifically, the photovoltaic panels are laid on the wider top of the pool structure, and there is no obstruction above it, which is conducive to photovoltaic power generation. In order to maximize the consumption of new energy, energy storage technology is regarded as an important supplementary means because it can realize the time and space transfer of energy. At present, the most mainstream energy storage technology for user-side energy storage application scenarios is electrochemical energy storage technology, especially lithium-ion batteries, which have the most complete upstream and downstream industrial chain, the highest technical maturity, and the most outstanding comprehensive benefits. The energy storage projects carried out by water plants are mainly lithium-ion energy storage. However, while lithium-ion electrochemical energy storage technology brings about improved consumption and benefits, it is also accompanied by higher safety risks, especially fire hazards. It is understandable that inherent safety risks are difficult to solve by themselves, so additional protection measures play a very important role in the safety of energy storage devices.

[0003] After searching, the patent with publication number CN221266962U discloses a fire extinguishing system for an energy storage device, including a water reservoir and a first pipeline, a connecting pipe and a second pipeline that are detachably connected in sequence along the liquid flow direction. The first pipeline and the connecting pipe are both located on the outside of the energy storage device, and the water inlet end of the first pipeline extends into the water reservoir. The first pipeline is provided with an electric control valve; part of the second pipeline is arranged inside the energy storage device and above the energy storage device. When a fire occurs, the electric control valve opens to introduce water in the water reservoir into the energy storage device for fire extinguishing. This patent has the following problems: 1. It is necessary to build a special water reservoir, and the water volume in the water reservoir cannot be continuously supplied for a long time; 2. When extinguishing a fire, a water pump is required to assist, which has high energy consumption, and an AC-powered water pump is used to supply water. When a fire occurs, the circuit may be damaged, making the water pump unable to work normally; 3. When the fire monitoring system fails, the electric valve cannot work, and the reliability needs to be further improved. Summary of the invention

[0004] In view of this, an object of the present invention is to provide an external passive fire-fighting device for a water plant energy storage system to solve the deficiencies in the prior art.

[0005] In order to achieve the above object, the present invention is achieved through the following technical solutions:

[0006] An external passive fire-fighting device for a water plant energy storage system is provided, comprising:

[0007] A closed water tank, including a closed space for accommodating the energy storage device, having a drain port and a liquid level gauge;

[0008] The fire water channel has a first end connected to the pool structure and a second end connected to the closed water tank, the first end is higher than the second end, a first valve connected to the liquid level meter is provided near the first end, and a second valve with automatic temperature sensing function is provided at the second end.

[0009] As described in the external passive fire-fighting device for the water plant energy storage system, wherein both sides of the fire waterway are provided with a sloped escape passage with a climbing handrail inside, and one end of the escape passage is connected to the top of the pool structure.

[0010] As described in the external non-passive fire-fighting device for the water plant energy storage system, wherein the closed water tank is vertically surrounded by a plurality of fire-fighting partitions around the energy storage device, the bottom of the fire-fighting partition is detachably fixed to the ground, and two adjacent fire-fighting partitions are detachably connected horizontally.

[0011] As described in the external passive fire-fighting device for a water plant energy storage system, wherein an inspection door is provided on a fire baffle on one side of the closed water tank, and the direction of the inspection door is different from the water flow direction of the fire waterway.

[0012] As described in the external passive fire-fighting device for a water plant energy storage system, a shielding plate is provided on the top of the outer side of the closed water tank.

[0013] As described in the external passive fire-fighting device for the water plant energy storage system, an alarm is provided on the inner top of the closed water tank, and the alarm includes a smoke alarm and a temperature alarm.

[0014] The beneficial effects of the technical solution of the present invention are:

[0015] 1. In view of the safety and fire protection issues of energy storage devices, the present invention makes full use of the characteristics of the water plant pool structure and directly uses the treated water in the water plant production process for fire fighting, thus realizing the rational and full utilization of water resources. In the event of an emergency fire in the energy storage device, fire protection measures can be quickly initiated to prevent the occurrence of safety accidents, and the safe and stable operation of the water plant pool structure after the introduction of photovoltaic and energy storage technologies is fully guaranteed, providing effective guarantee for the green, low-carbon, safe and efficient operation of the water plant, and providing strong safety guarantee for the green transformation and sustainable development of the water plant;

[0016] 2. According to the liquid level signal in the closed partition structure, after the treated water in the pool structure gradually and completely submerges the energy storage device, the present invention closes the first valve to cut off the water flow from the pool structure, so that no water enters the closed partition structure, thereby reducing unnecessary water inflow operations, avoiding waste of water resources, and ensuring the reliability and stability of the fire-fighting device;

[0017] 3. The fire baffle of the present invention can be flexibly installed and disassembled according to the on-site conditions, so as to meet the application of energy storage devices of different sizes and can adapt to situations such as energy storage capacity expansion, and has strong versatility. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To further illustrate the above-mentioned objectives, structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings.

[0019] Figure 1 It is a schematic diagram of the structure of a preferred embodiment of the present invention;

[0020] Figure 2 for Figure 1 Middle section along AA direction;

[0021] Figure 3 for Figure 1 Middle section along BB direction;

[0022] In the figure: 1. Energy storage device; 2. Water tank structure; 3. Closed water tank; 4. Fire waterway; 5. Drain; 6. Liquid level gauge; 7. First valve; 8. Second valve; 9. Inspection door; 10. Escape passage; 11. Shield; 12. Smoke alarm; 13. Temperature alarm. DETAILED DESCRIPTION

[0023] The terms "invention", "present invention" and "the present invention" used in this specification are intended to refer broadly to all subject matter of this specification and any patent claims below. Statements containing these terms should not be understood to limit the subject matter described herein or to limit the meaning or scope of any patent claim below. In addition, this specification does not attempt to describe or limit the subject matter covered by any claim of any specific component, paragraph, statement or figure of this application. The subject matter should be understood with reference to the entire specification, all drawings and any claims below. The present invention may have other embodiments and be practiced or implemented in other ways. Moreover, it should be understood that the words and terms used herein are for illustrative purposes and should not be considered as limiting.

[0024] The details of the present invention will now be discussed with reference to the accompanying drawings which illustrate the present invention by way of example only. In the accompanying drawings, similar features or components may be marked with the same reference numerals.

[0025] The use of "including," "having," and "comprising" and variations thereof herein is meant to encompass the items listed thereafter and their equivalents and additional items. Although reference may be made to directions such as above, below, upward, downward, rearward, bottom, top, front, rear, etc., in describing the drawings, for convenience, reference is made relative to the drawings. These directions are not intended to literally accept or limit the present invention in any form. In addition, terms such as "first," "second," "third," etc., are used herein for illustrative purposes and are not intended to indicate or imply importance or significance.

[0026] See also Figure 1 , Figure 2 and Figure 3As shown, the external passive fire-fighting device in the present invention is used for the water plant energy storage system. It should be made clear in advance that the energy storage system in this article is the energy storage device, and the fire-fighting system includes the energy storage's own fire-fighting control components and the external passive fire-fighting device designed by the present invention. In a water plant (including a water plant and a sewage plant), the energy storage device 1, such as a lithium-ion electrochemical energy storage device, is mostly a container structure, and the top height of the pool structure 2 is higher than the outdoor floor, and higher than the top of the energy storage device 1. In order to improve the safety of the water plant energy storage device 1, the present invention provides an external passive fire-fighting device for a water plant energy storage system, which is deployed next to the pool structure 2 in the water plant, and is precisely placed between the pool structure 2 and the lithium-ion electrochemical energy storage device, completely wrapping the energy storage device 1, and complementing the fire-fighting system of the energy storage device 1 itself to form an all-round safety barrier. In a preferred embodiment, the fire fighting device specifically includes a closed water tank 3 and a fire fighting waterway 4. The closed water tank 3 includes a closed space for accommodating the energy storage device 1. The closed water tank 3 has a drain 5 and a liquid level gauge 6. The drain 5 is used to discharge the water inside the closed water tank 3 after the fire is extinguished. The liquid level gauge 6 is used to obtain the liquid level height in the closed water tank 3 in real time. The fire fighting waterway 4 has a first end connected to the pool structure 2 and a second end connected to the closed water tank 3. The first end is higher than the second end. The water in the pool structure 2 flows into the closed water tank 3 by gravity. A first valve 7 connected to the liquid level gauge 6 is provided near the first end, and a second valve 8 with an automatic temperature sensing function is provided at the second end. The first valve 7 is a normally open valve, and the second valve 8 automatically opens after sensing the temperature after a fire occurs. The first valve 7 detects the internal liquid level of the closed water tank 3 and can be automatically closed at the liquid level position where the energy storage device 1 is completely submerged. Specifically, the first valve 7 is an electric mechanical door, which is a normally open valve to ensure that there is water inside the fire fighting waterway 4, so that the fire can be quickly extinguished when a fire occurs in the energy storage device. When maintenance is required, it can be closed to cut off the water flow from the pool structure. The second valve 8 is a passive valve that can avoid being affected by fire, thereby improving the reliability of the fire-fighting device. Exemplarily, the second valve 8 is a temperature-controlled fast-acting mechanical gate, which opens when a fire occurs in the energy storage device 1. The second valve 8 can be opened quickly according to the temperature increase inside the energy storage device 1. Through the mutual cooperation of the first valve 7 and the second valve 8, the energy storage device 1 can be quickly extinguished in the event of a fire, and the water supply can be cut off after the fire is extinguished to facilitate maintenance and other operations.

[0027] Furthermore, the closed water tank 3 is vertically surrounded by a plurality of fire partitions around the energy storage device 1. The bottom of the fire partition is detachably fixed to the ground, and two adjacent fire partitions are detachably connected horizontally. The fire partition plays a role in fire prevention and water seepage prevention. A gap is left between the fire partition and the energy storage device 1 to facilitate the maintenance and heat dissipation of the energy storage device 1. When the capacity and volume of the energy storage device 1 change in the later stage, the arrangement of the fire partition can be adjusted accordingly according to the horizontal layout of the actual energy storage device 1 to ensure that the energy storage device 1 is completely surrounded, which has strong versatility.

[0028] The conventional design of the water tank structure 2 in the water plant is often higher than the energy storage device 1, and the height of each water tank structure 2 in the water plant is determined by the water head height of the water plant. The water tank structure 2 is high and low. If the water tank structure 2 is designed to be relatively low, the energy storage device 1 and the fire-fighting device cannot be set on the ground to reach the determined gravity height difference, that is, according to the existing gravity height difference, the pipe diameter of the fire-fighting waterway 4 is greater than the maximum pipe diameter value set manually. In order to increase the height difference, according to the height of the water tank structure 2, the bottom of the energy storage device 1 and the fire-fighting baffle are set in a pit below the ground, so that the preset height difference is maintained between the water tank structure 2 and the energy storage device 1 or the fire-fighting baffle, ensuring that the water inflow is completed within the specified time and rapid fire extinguishing is achieved. Therefore, the layout of the energy storage device 1 can be flexibly adjusted to a low position according to the pool structure 2, and the bottom of the energy storage device 1 is placed in a pit below the ground. The fire-fighting device is installed as usual to ensure that the necessary gravity height difference is maintained between the pool structure 2 and the energy storage device 1, so as to facilitate the water in the pool structure 2 to flow into the closed water tank 3.

[0029] The liquid level meter 6 is preferably a float type liquid level meter, which has a water level float located in the closed water tank 3. The water level float rises with the water level. After it rises to a liquid level that completely submerges the energy storage device 1, the first valve 7 is closed.

[0030] The fire water channel 4 uses gravity inflow to inflow water, which can avoid the inaction of active devices such as water pumps when a fire occurs. At the same time, since the amount of water in the pool structure 2 remains basically stable, the gravity height difference is kept at a high state during design, and the water inflow speed will not decrease significantly over time, which can ensure that when a fire occurs in the energy storage device 1 at any time, the water in the pool structure 2 can be used for fire fighting. In a preferred embodiment, the pool structure 2 is provided with a first hole for connecting to the first end of the fire water channel 4, and the closed water tank 3 is provided with a second hole for connecting to the second end of the fire water channel 4. The caliber of the fire water channel 4 can be determined based on the height of the first hole and the second hole, the height difference and horizontal distance between the pool structure 2 and the energy storage device 1, the amount of water required for the energy storage device 1 to be completely submerged, and the fire fighting time of the energy storage device 1 after being submerged.

[0031] Generally speaking, the horizontal distance between the energy storage device 1 and the pool structure 2 is determined. In the embodiment of the present invention, the height of the two ends of the fire waterway 4 is determined first. The gravity height difference is the vertical distance between the centers of the first hole and the second hole. After the height difference is determined, the diameter is determined. If the height difference is not enough, a large diameter pipe may be required to meet the water inlet time requirement, which increases the difficulty of production and installation. It is also possible that even a large diameter pipe cannot meet the water inlet time requirement. Therefore, it is necessary to set the height difference as large as possible to reduce the diameter of the pipe, which is convenient for pipe production and installation.

[0032] A maintenance door 9 serving as an artificial passage for the fire-fighting device is provided on the fire baffle on one side of the closed water tank 3. The direction of the maintenance door 9 is different from the water flow direction of the fire waterway 4, and will not affect the entry of personnel for maintenance and escape. The energy storage device 1 is entered through the maintenance door 9, which has good airtightness and will not leak when closed.

[0033] Both sides of the fire water channel 4 are provided with a sloped escape passage 10 with a climbing handrail, and one end of the escape passage 10 is connected to the top of the pool structure 2. When maintenance personnel enter the energy storage device 1 for maintenance and encounter unexpected situations, if they cannot escape through the inspection door 9, they can use the escape passages 10 on both sides to escape to the top edge of the pool structure 2, and then go down through the manhole of the pool structure 2 to escape to a safe place. For example, when the core equipment of this fire-fighting device, such as the second valve 8 in the fire water channel 4, fails and needs maintenance, the maintenance personnel first remotely close the first valve 7 in the fire water channel 4 outside the fire-fighting device, and then enter the interior through the inspection door 9 for maintenance. If an accident occurs during the maintenance process, the inspection door 9 cannot be opened, and they can escape from the escape passage 10 to the top channel of the pool structure 2.

[0034] The drain port 5 is located at the bottom of the fire baffle 1. When the fire fighting device completes the fire fighting, a large amount of water is stored inside the device. The water used for fire fighting can be discharged through the drain port 5 later, so that the staff can check the inside. For example, since there is a large water pressure at the drain port 5 after the fire fighting is completed, the fire hose with an inner buckle joint can be used from the outside to quickly connect the drain port 5 by rotating and snapping to discharge the water.

[0035] A shielding plate 11 is provided on the top of the outer side of the closed water tank 3. The shielding plate 11 is used to provide shielding for the energy storage device 1 and facilitate the heat dissipation of the energy storage device 1. Exemplarily, the shielding plate 11 is erected on the top of the fire baffle with an iron rod. The shielding plate 11 is used to provide shielding for the energy storage device 1, and plays a role in sun protection and rain protection. It can block the sun exposure and prevent rain from entering. Since the shielding plate 11 is erected on the top of the fire baffle by a bracket, there is a gap between the shielding plate 11 and the fire baffle, which is conducive to the heat dissipation of the energy storage device 1. If a fire occurs, the smoke generated can be dispersed through the top of the closed water tank 3 so that relevant personnel can observe the fire.

[0036] The top of the inner side of the closed water tank 3 is provided with an alarm for sending out alarm information in case of fire, and the alarm includes a smoke alarm 12 and a temperature alarm 13. The smoke alarm 12 and the temperature alarm 13 are placed on the inner side of the top of the shielding plate 11, and will not be submerged by water. At the same time, they can effectively sense temperature and smoke, and quickly send out alarm sound effects when encountering a fire, and transmit signals to the central control room.

[0037] In a specific embodiment, in the sewage treatment plant, the pool structure 2 is 5.6m above ground and 3.3m underground, the water surface height of the pool structure 2 is 4.6m, and the lithium-ion electrochemical energy storage container adopts a standard 20-foot container, which is 6.1m long, 2.44m wide, and 2.59m high. The fire partition of the fire-fighting device is separated from the internal container by a distance to facilitate the passage of personnel, and the distance is set to 0.8m, which is enough for adults to pass through.

[0038] Assuming that the fire partition has a 0.8m passage on both sides of the container in the length direction, the distance between the fire partitions on both sides in this direction is 7.7m. Similarly, if a 0.8m passage is left on both sides in the width direction, the distance between the fire partitions on both sides in this direction is 4.04m. This fire-fighting device is not capped, and the height of the fire partitions on all sides should be higher than the top of the energy storage container, so a certain operating space is left above the height direction. The height of the fire partition is 3m.

[0039] The escape passage 10 of the fire fighting device is set to a width of 0.8m to facilitate adults to pass through, taking into account the situation that people may wear thicker clothes or carry items in an emergency.

[0040] The amount of water that completely floods the energy storage device 1 with water from the pool structure needs to take into account the space between the energy storage device 1 and the fire partition and part of the space of the escape passage 10 for maintenance personnel, which involves the distance design for personnel activities. If the second valve 8 is opened and the water in the pool structure 2 completely floods the energy storage container, the volume of water that needs to flow in is:

[0041] The water volume inside the rectangular partition:

[0042] V 1 =(S 1 -S 2 )×H

[0043] =(7.7×4.04_6.1×2.44)×2.59

[0044] =41.98m 3

[0045] The volume of water entering the escape passage 10:

[0046]

[0047] The total water inlet volume is:

[0048] V=V 1 +V 2 =41.98+12.86=54.84m 3

[0049] If the container is required to be completely submerged within 30 seconds, the required water flow rate is approximately:

[0050]

[0051] The height difference between the two ends of the fire waterway 4 is artificially set to 4m. Considering the maximum height difference, a smaller diameter is designed. Considering the influence of gravity and the horizontal distance of the pipeline is 10 meters, the angle α between the pipeline and the ground plane is 4 meters when the pipeline height difference is 4 meters:

[0052]

[0053] Then α=21.8°.

[0054] For a body of water at different altitudes, Bernoulli's equation applies:

[0055]

[0056] Assume that the fire water channel 4 is connected to the pool structure 2 at position 1, and is connected to the fire partition of the fire fighting device at position 2:

[0057] A position 1: The initial velocity in the direction of fire waterway 4 is approximately equal to 0, and the pressure is P 1 =P atm +pgh 1

[0058] B position 2: The velocity in the direction of the fire waterway 4 is equal to v, and the pressure is P 2 =P atm

[0059]

[0060] v=8.516m / s

[0061] Substitute the velocity into the flow formula to calculate the pipe diameter D:

[0062] Q=v×A

[0063]

[0064] D=0.52m

[0065] In summary, the fire water channel 4 has an inclination angle of 21.8° to the horizontal plane, and the diameter of the pipe is 0.52m.

[0066] The pool structure 2 in the water plant is mostly an important core process unit, which is in a perennial uninterrupted operation device. When the pool structure 2 and the energy storage device 1 such as the lithium ion electrochemical energy storage device are operating normally, the first valve 7 in the fire waterway 4 is in an open state, the second valve 8 is in a closed state, and no water flows into the fire-fighting device. When a fire occurs in the energy storage device 1, the temperature rises, and the second valve 8 senses the temperature and opens quickly, and the water in the pool structure 2 flows into the closed water tank 3 through the fire waterway 4 by gravity. As the water flows in, the water in the closed water tank 3 completely submerges the energy storage device 1, extinguishing its open fire. According to the liquid level inside the closed water tank 3, the liquid level signal at the liquid level position where the energy storage device 1 is completely submerged drives the first valve 7 to close, cuts off the water flow from the pool structure 2, and stops the internal water of the fire-fighting device from entering, reducing unnecessary water inlet operations, avoiding waste of water resources, and ensuring the reliability and stability of the fire-fighting device. Finally, when the professionals arrive at the scene, the water inside the closed water tank 3 is discharged through the drain port, and the professionals enter the device to check the situation.

[0067] In the above embodiment of the present invention, the fire-fighting device is arranged outside the energy storage device 1, completely surrounding the energy storage device 1. The energy storage device 1 is horizontally connected to the outside through five channels, namely, the inspection door 9, the fire waterway 4, the drain 5, and the two escape passages 10. The external surrounding mode of the fire-fighting device has the advantages of on-site flexibility and detachability, etc., which can meet the application of energy storage devices of different scales and can also adapt to the situation of energy storage expansion, etc., and has strong versatility.

[0068] The fire-fighting device in the above-mentioned embodiment of the present invention can cover various forms of energy storage devices and does not conflict with the safety fire-fighting systems provided by these energy storage devices, thereby providing an additional safety protection for the water plant energy storage device and improving the safety of the energy storage device.

[0069] The fire-fighting device in the above-mentioned embodiment of the present invention utilizes the treated water in the water treatment process for fire-fighting, which is a kind of water resource utilization. The amount of treated water in the water plant fluctuates with the seasons, but is generally stable, which can effectively guarantee the amount of water for energy storage fire-fighting, thereby solving the problem that the water flow cannot be continuously supplied for a long time by using a water reservoir.

[0070] Compared with the valves with only one level of protection in the prior art, the above embodiment of the present invention uses a passive valve as the main valve for fire water inlet to avoid the impact of fire on the circuit fire action, and cooperates with the electric gate near the pool side (away from the energy storage fire location) to achieve fire extinguishing of the energy storage device. The above embodiment of the present invention sets a fire-fighting device outside the energy storage device system itself, and the two are independent of each other, which can provide double protection for the energy storage device.

[0071] In response to the fire safety issues of water plant energy storage devices, the fire-fighting device of the present invention fully utilizes the characteristics of the water plant water tank structure and directly uses the treated water in the water plant production process for fire extinguishing, thereby realizing the full and rational utilization of water resources. It can quickly initiate fire protection measures in the event of an emergency when a fire occurs in the energy storage device to prevent the occurrence of safety accidents, and comprehensively ensure the safe and stable operation of the water plant water tank structure after the introduction of photovoltaic and energy storage technologies, providing effective protection for the green, low-carbon, safe and efficient operation of the water plant, and providing strong safety protection for the green transformation and sustainable development of the water plant.

[0072] The above are only preferred embodiments of the present invention, and are not intended to limit the implementation methods and protection scope of the present invention. Those skilled in the art should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. An external passive fire-fighting device for a water plant energy storage system, characterized in that: include: A closed water tank, including a closed space for accommodating the energy storage device, having a drain port and a liquid level gauge; The fire water channel has a first end connected to the pool structure and a second end connected to the closed water tank, the first end is higher than the second end, a first valve connected to the liquid level meter is provided near the first end, and a second valve with automatic temperature sensing function is provided at the second end.

2. The external passive fire-fighting device for a water plant energy storage system according to claim 1, characterized in that: Both sides of the fire waterway are provided with sloped escape passages with climbing handrails inside, and one end of the escape passage is connected to the top of the pool structure.

3. The external passive fire-fighting device for a water plant energy storage system according to claim 1, characterized in that: The closed water tank is vertically surrounded by a plurality of fire baffles around the energy storage device, the bottom of the fire baffle is detachably fixed to the ground, and two adjacent fire baffles are detachably connected horizontally.

4. The external passive fire fighting device for a water plant energy storage system as claimed in claim 3, characterized in that: An inspection door is arranged on a fire partition at one side of the closed water tank, and the direction of the inspection door is different from the water flow direction of the fire waterway.

5. The external passive fire-fighting device for a water plant energy storage system as claimed in claim 1 or 3, characterized in that: A shielding plate is provided on the top of the outer side of the closed water tank.

6. The external passive fire fighting device for a water plant energy storage system as claimed in claim 1, characterized in that: An alarm is arranged on the inner top of the closed water bin, and the alarm comprises a smoke alarm and a temperature alarm.

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