Fire protection system for underground oil tank in diesel engine plant of nuclear power plant

Abstract

The utility model provides an underground oil tank fire protection system in a nuclear power plant diesel engine plant, which comprises a foam fire extinguishing system, a camera and a combustible gas detector, a fire hose interface is arranged on a pipeline of the foam fire extinguishing system in a foam room, and the camera and the combustible gas detector are arranged in a main oil tank room. The fire hose connector is convenient for firefighters to supplement foam liquid and / or fire water to strengthen fire extinguishment, effectiveness of a foam fire extinguishing system is guaranteed, the camera performs video monitoring on a main oil tank and performs key monitoring on oil leakage risk areas at a tank body flange connecting pipe and a valve sealing position, and once a small fire occurs, the small fire can be confirmed as early as possible, and fire hidden dangers are reduced to the minimum. Therefore, under the condition that the overall arrangement design of the existing diesel engine plant and the main oil tank is not changed as far as possible, a reasonable and feasible fire prevention and elimination combined technology is adopted, the fire behavior between the main oil tanks is found and mastered as soon as possible, corresponding fire extinguishing measures are adopted according to the development of the fire behavior, the fire risk is reduced, and the fire extinguishing effect is improved.

Description

Technical Field

[0001] This utility model belongs to the technical field of nuclear power plant layout, and specifically relates to a fire protection system for underground oil tanks in the diesel engine room of a nuclear power plant. Background Technology

[0002] Emergency diesel generator sets are crucial as the sole emergency power source when a nuclear power plant loses its mains power. Their function is to provide medium-voltage emergency AC power to the nuclear power plant when the external AC power system fails, ensuring safe reactor shutdown and preventing accidents. The fuel system, another important power system of the emergency diesel generator set, ensures the unimpeded delivery of qualified fuel to the fuel injection pump inlet, providing vital support for the stable operation of the diesel generator set. To guarantee the continuous normal operation of the emergency diesel generator set under this condition, the fuel system needs to provide enough fuel for at least seven days of full-load operation. The underground fuel tanks are classified as Level 3 nuclear safety equipment and must withstand external disasters such as earthquakes, large aircraft impacts, small aircraft impacts, external explosions, tornadoes, and their projectiles.

[0003] To meet the nuclear safety requirements of the underground oil tanks and to facilitate the gravity flow of unburned fuel and unpressurized leaks from the diesel generators located on the 0m level to the underground tanks, the underground oil tanks of the nuclear power plant's emergency diesel generator building are located on the -11.3m level of the diesel engine building's basement. The fuel delivery pumps that pressurize and deliver fuel to the diesel engines are also located in this room. The main oil tank room must be equipped with a fire extinguishing system, including smoke and flame detectors and an automatic sprinkler system installed in the main oil tank room. Once the detection system detects an alarm signal, the sprinkler system will automatically activate or be manually activated to extinguish the fire.

[0004] The methods described above can extinguish small fires in their early stages, but the main oil tank room is located in a basement, a confined space that makes it difficult for firefighters to assess the situation inside and conduct external firefighting and rescue operations after a fire breaks out. Furthermore, a sustained fire in the underground oil tank could lead to structural collapse, posing a risk of damage to the diesel generator sets located above it. Since the underground oil tank is nuclear-grade equipment, it needs to withstand external disasters, and moving it out of the plant is difficult. Therefore, reducing the risk of fire and improving firefighting effectiveness are urgently needed.

[0005] Therefore, it is necessary to design a fire protection system for underground oil tanks in the diesel engine room of a nuclear power plant. Utility Model Content

[0006] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a fire protection system for nuclear-grade oil tanks in nuclear power plants. Under the premise of not changing the overall layout design of the existing diesel engine plant and underground oil tanks as much as possible, it adopts reasonable and feasible combined prevention and firefighting technology to detect and grasp the fire situation between the main oil tanks as early as possible, and take corresponding fire extinguishing measures according to the development of the fire situation to reduce the consequences of the fire.

[0007] To achieve the above and other related objectives, this utility model proposes a fire protection system for underground oil tanks in a nuclear power plant diesel engine room. The underground oil tanks are located within the main oil tank compartment, with a foam room adjacent to the main oil tank compartment. Above the main oil tank compartment, an electrical room and a diesel engine hall are sequentially located. The system includes:

[0008] A foam fire extinguishing system, wherein the foam tanks of the foam fire extinguishing system are arranged in a foam tank room, and the spray head assembly of the foam fire extinguishing system is arranged above the underground oil tanks in the main oil tank room; fire hose interfaces are provided on the pipelines of the foam fire extinguishing system located in the foam room;

[0009] A camera, which is arranged in the main oil tank room;

[0010] A combustible gas detector is arranged in the main oil tank room and close to the underground oil tank.

[0011] In a preferred embodiment of this utility model, the camera is an explosion-proof camera with a pan-tilt-zoom (PTZ) mechanism.

[0012] In a preferred embodiment of this utility model, the combustible gas detector is used to measure the concentration of diesel vapor in the air inside the main oil tank room, and to issue an alarm signal based on the measured diesel vapor concentration.

[0013] In a preferred embodiment of this utility model, the spraying system includes:

[0014] A foam tank, the inlet of which is connected to the fire protection pipe network via pipe I;

[0015] A spray head assembly, the inlet of which is connected to the outlet of the foam tank via pipe II;

[0016] A proportioning mixer, which is connected between pipe I and pipe II via pipe III.

[0017] In a preferred embodiment of this utility model, a deluge valve is provided on the pipe III.

[0018] In a preferred embodiment of this utility model, valves are provided on both pipe I and pipe II, and the valves are arranged inside the foam tank room.

[0019] In a preferred embodiment of this utility model, the underground oil tank is a horizontal oil tank, and an atmospheric pipe is connected to the top of the underground oil tank.

[0020] In a preferred embodiment of this utility model, the main oil tank room is equipped with smoke detectors and flame detectors for detecting fires and issuing alarm signals.

[0021] In a preferred embodiment of this utility model, a ladder opening is provided at the top of the main oil tank, and a fireproof cover is fitted on the ladder opening.

[0022] In a preferred embodiment of this utility model, the main oil tank room is an independent fireproof zone and is connected to the outside atmosphere through a ventilation duct, which is equipped with a fire damper.

[0023] In a preferred embodiment of this utility model, a filling and draining pipeline for high-temperature water or lubricating oil in the basement of the diesel engine workshop is also included, the filling and draining pipeline comprising:

[0024] The first filling and draining outlet is located inside the main oil tank room;

[0025] The second inlet / outlet is located inside the electrical room;

[0026] The zero-layer filling and draining port is connected to the first filling and draining port and the second filling and draining port respectively through pipe IV.

[0027] In a preferred embodiment of this utility model, the pipe IV is a pipe with a nominal diameter of 100 mm.

[0028] The beneficial technical effects of this utility model include at least the following:

[0029] This utility model discloses a fire protection system for underground oil tanks in a nuclear power plant's diesel engine building. It adds a fire hose interface (using a pump connector to connect to the outdoor 0m floor via fire hose) to the foam extinguishing system in the main oil tank area. This allows firefighters to replenish foam liquid and / or fire water to enhance firefighting efforts, ensuring the effectiveness of the foam extinguishing system and reducing the risk of failure. Simultaneously, cameras are added to the main oil tank area for video monitoring, focusing on areas with leakage risks such as tank flange connections and valve seals. In the event of a small fire, it can be identified as early as possible, minimizing fire hazards. Video monitoring also allows firefighters to monitor the personnel situation in the oil tank area during a fire and to make appropriate personnel deployments. Therefore, this utility model, without altering the existing overall layout design of the diesel engine building and main oil tanks, adopts a reasonable and feasible combination of prevention and firefighting technologies to detect and monitor fires in the main oil tank area as early as possible, and to take corresponding firefighting measures according to the development of the fire, reducing the risk of fire and improving firefighting effectiveness. Attached Figure Description

[0030] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Figure 1 This is a schematic diagram of a foam fire extinguishing system in one embodiment of the present invention.

[0032] Figure 2 This is a schematic diagram of the filling and draining pipeline for high-temperature water or lubricating oil in the basement of a diesel engine factory in one embodiment of the present invention.

[0033] Figure 3 This is a schematic diagram of the layout of the main oil tank room in an existing diesel engine plant in one embodiment of the present invention.

[0034] Figure 4 This is a schematic diagram of the elevation layout of the main oil tank room in an existing diesel engine plant in one embodiment of the present invention.

[0035] Labeling Explanation: 10-Main oil tank room; 20-Foam room; 30-Fire protection network; 11-Underground oil tank; 111-Atmospheric duct; 12-Camera; 21-Foam tank; 22-Sprinkler head assembly; 23-Fire hose connection; 24-Pipe I; 25-Pipe II; 26-Pipe III; 27-Delta valve; 28-Proportioning mixer; 31-First filling and draining port; 32-Second filling and draining port; 33-0th floor filling and draining port; 34-Pipe IV. Detailed Implementation

[0036] The following specific examples illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this utility model.

[0037] It should be noted that the illustrations provided in this embodiment are only schematic representations of the basic concept of this utility model. Therefore, the drawings only show the components related to this utility model and are not drawn according to the actual number, shape and size of the components. In actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0038] Please see Figures 1-4As shown, to achieve the above-mentioned objectives and other related objectives, this utility model proposes a fire protection system for underground oil tanks in a nuclear power plant diesel engine room. The underground oil tank 11 is located within the main oil tank compartment 10, and a foam compartment 20 is located adjacent to the main oil tank compartment 10. An electrical room and a diesel engine hall are located sequentially above the main oil tank compartment 10. The fire protection system for the underground oil tank 11 of this utility model includes a foam extinguishing system, a camera 12, and a combustible gas detector. The foam tanks 21 of the foam extinguishing system are located within the foam tank compartment 21, and the spray head assembly 22 of the foam extinguishing system is located above the underground oil tank 11 in the main oil tank compartment 10. A fire hose interface 23 is provided on the pipes of the foam extinguishing system located in the foam compartment 20. The camera 12 is located within the main oil tank compartment 10, and the combustible gas detector is located within the main oil tank compartment 10, close to the underground oil tank 11.

[0039] It should be noted that the maximum effective volume of a single underground oil tank 11 is approximately 349 m³. 3 The main oil tank is a horizontal tank with an inner diameter of 5.3m and a total length of approximately 18m. The medium inside is diesel fuel, a Class C flammable substance with a flash point not lower than 60℃. To meet the nuclear safety requirements of underground oil tank 11 and to facilitate the gravity flow of unburned fuel and unpressurized leaks from the diesel generator located on the 0m level to underground oil tank 11, the existing nuclear power plant emergency diesel generator building's underground oil tank 11 is located on the -11.3m level of the diesel engine building's basement. The fuel delivery pump, which pressurizes and delivers fuel to the diesel engine, is also located in this room. The main oil tank room 10 has a net space of 24.4m long, 7.35m wide, and 6.5m high. The space below the threshold of the main oil tank room 10 can accommodate the volume of fuel inside the tank. The electrical room above the main oil tank room 10 is located on the -3.78m level of the diesel engine building's basement. The equipment motors and control devices in the electrical room are explosion-proof.

[0040] It should be noted that the foam fire extinguishing system can be a fixed aqueous film-forming fire (AFFF) automatic sprinkler. Once the fire detection system detects an alarm signal, it will automatically start or be manually activated for emergency fire extinguishing. Foam spraying lasts for 10 minutes, while fire water spraying can last for up to 2 hours.

[0041] By connecting camera 12 to the intelligent monitoring platform, smart monitoring can be achieved, which can collect and analyze video data in real time, thereby improving the efficiency and intelligence level of monitoring. It also has the functions of fire verification and intelligent identification of personnel entering the main oil tank room.

[0042] This utility model discloses a fire protection system for underground oil tanks in a nuclear power plant's diesel engine building. It adds a fire hose interface 23 to the foam extinguishing system in the main oil tank area (connecting to the outdoor 0m floor via a water pump connector and fire hose), allowing firefighters to replenish foam liquid and / or fire water to enhance firefighting efforts, ensuring the effectiveness of the foam extinguishing system and reducing its failure risk. Simultaneously, a camera 12 is added to the main oil tank room 10 for video monitoring, focusing on areas with potential oil leakage risks, such as tank flange connections and valve seals. In the event of a small fire, it can be identified early, minimizing fire hazards. Video monitoring also allows firefighters to monitor personnel in the oil tank area during a fire and make appropriate personnel deployments. Therefore, this utility model, without altering the existing overall layout design of the diesel engine building and main oil tanks, adopts a reasonable and feasible combined prevention and firefighting technology to detect and monitor fires in the main oil tank room 10 as early as possible, and to take corresponding firefighting measures according to the development of the fire, reducing the risk of fire and improving firefighting effectiveness.

[0043] In a preferred embodiment of this utility model, the camera 12 is an explosion-proof camera with a pan-tilt unit.

[0044] It should be noted that explosion-proof pan-tilt cameras are monitoring devices specifically designed for hazardous environments, typically used in industries such as petroleum, chemical, and mining. These cameras can operate safely in flammable and explosive environments, generally meeting international explosion-proof standards (such as ATEX and IECEx), preventing explosions caused by equipment malfunctions. They also allow for remote control of the camera's rotation, tilt, and zoom, facilitating comprehensive monitoring and improving the coverage of the monitored area.

[0045] In a preferred embodiment of this utility model, a combustible gas detector is used to measure the concentration of diesel vapor in the air inside the main oil tank room 10, and to issue an alarm signal based on the measured diesel vapor concentration, so as to promptly dispatch personnel to intervene and check the ventilation operation and whether there is any fuel leakage.

[0046] It should be noted that diesel vapor is heavier than air. Combustible gas detectors should be installed within the main oil tank room 10. Additional detectors can be added near valves and flanges, areas prone to leakage, close to the ground. Local alarms should be installed, and alarm signals should be sent to the fire control room or main control room. The primary alarm signal value should be ≤25% of the lower explosive limit of diesel vapor concentration, and the secondary alarm signal value should be ≤50% of the lower explosive limit of diesel vapor concentration. The combustible gas detectors can be catalytic combustion sensors.

[0047] The lower explosive limit (LEL) of diesel vapor generally refers to the minimum concentration of diesel vapor in air that will cause an explosion upon contact with an ignition source. The LEL for diesel vapor is typically between 0.6% and 1.0%, but the specific value may vary depending on the composition of the diesel fuel. In practical applications, the specific LEL value and corresponding alarm settings need to be determined based on the actual type of diesel fuel and the plant's safety regulations.

[0048] In a preferred embodiment of the present invention, the sprinkler system includes a foam tank 21, a sprinkler head assembly 22, and a proportioning mixer 28. The inlet of the foam tank 21 is connected to the fire protection network 30 via pipe I 24; the inlet of the sprinkler head assembly 22 is connected to the outlet of the foam tank 21 via pipe II 25; and the proportioning mixer 28 is connected between pipe I 24 and pipe II 25 via pipe III 26.

[0049] It should be noted that the spray head assembly 22 includes at least three sets of spray heads, and the three sets of spray heads are arranged along the tank body direction of the underground oil tank 11.

[0050] In a preferred embodiment of this utility model, a deluge valve 27 is provided on the pipe Ⅲ26.

[0051] It should be noted that the deluge valve 27 mainly has the following functions: Rapid opening of the sprinkler system: In the event of a fire, it can automatically open in a very short time, allowing fire-fighting water to quickly flow into the system network, enabling the sprinklers to spray water without delay, responding quickly to the fire, and effectively controlling the spread of fire. Isolation control: Normally in the closed state, it can isolate the fire-fighting network from the water source. It opens as needed during a fire, isolating and controlling the water flow, ensuring system stability in non-fire conditions and timely water supply during a fire. Integration with detection systems: It is often linked with fire detection systems. When the detection system detects a fire signal, it sends an opening command to the deluge valve 27, realizing automated fire-fighting operation and improving fire-fighting efficiency and reliability.

[0052] In a preferred embodiment of this utility model, valves are provided on both pipe I 24 and pipe II 25, and the valves are arranged inside the foam tank 21.

[0053] In a preferred embodiment of the present invention, the underground oil tank 11 is a horizontal oil tank, and an atmospheric pipe 111 is connected to the top of the underground oil tank 11.

[0054] The underground oil tank 11 is connected to the outside atmosphere via an atmospheric duct 111. The main function of the atmospheric duct 111 is to maintain the pressure balance inside the underground oil tank 11. When liquid is drawn from or added to the tank, negative or positive pressure is generated inside. The atmospheric duct 111 allows outside air to enter and exit, thereby preventing damage or deformation to the tank structure. During operation, the underground oil tank 11 generates steam, especially during temperature changes. The atmospheric duct 111 can discharge excess steam, preventing steam accumulation and reducing the risk of explosion. The atmospheric duct 111 is designed to ensure that contaminants (such as rainwater, dust, etc.) do not enter the tank, reducing external contamination and preventing a decline in oil quality.

[0055] Furthermore, underground oil tank 11 and fuel pipelines are all electrostatically grounded.

[0056] In a preferred embodiment of this utility model, a smoke detector and a flame detector are provided in the main oil tank room 10 to detect fires and issue alarm signals.

[0057] In a preferred embodiment of this utility model, a ladder opening is provided at the top of the main oil tank room 10, and a fireproof cover is fitted on the ladder opening; it also includes a filling and draining pipeline for high-temperature water or lubricating oil in the basement of the diesel engine workshop, the filling and draining pipeline including: a first filling and draining port 31, a second filling and draining port 32, and a zero-layer filling and draining port 33, the first filling and draining port 31 being located inside the main oil tank room 10; the second filling and draining port 32 being located inside the electrical room; the zero-layer filling and draining port 33 being connected to the first filling and draining port 31 and the second filling and draining port 32 respectively through a pipe IV 34. The pipe IV 34 is a pipe with a nominal diameter of 100mm, i.e., DN100.

[0058] It should be noted that the main oil tank room 10 is at the -11.3m level, and the electrical room is at the -3.78m level. During the ongoing fire, water should be injected into the main oil tank room 10 at the escape ladder opening at the top of the -3.78m level to cool it. When injecting water, the fireproof cover at the escape ladder opening at the top of the main oil tank room 10 at the -3.78m level needs to be opened for ventilation. Firefighters can inject foam mixture to assist in firefighting through the outdoor interface, or inject fire water to cool the underground oil tank 11 and adjacent rooms. Alternatively, the existing high-temperature water or lubricating oil filling and draining pipes in the basement of the diesel engine plant can be used to inject water into the main oil tank room 10 for cooling through the reserved pipe interface at the -11.3m level (first filling and draining port 31). Similarly, water can be injected into the adjacent electrical room for cooling through the second filling and draining port 32. Firefighters can also inject foam mixture to assist in firefighting through the outdoor interface (0th floor filling and draining port 33), or inject fire water to cool the underground oil tank 11 and adjacent rooms to prevent structural damage. Among them, the diameter of pipe IV34 has been expanded from the original DN25 and DN40 to DN100. The DN100 pipe can provide a larger flow rate, which can allow for faster water injection or foam mixture injection, thereby improving the efficiency of fire extinguishing and cooling.

[0059] In a preferred embodiment of this utility model, the main oil tank room 10 is an independent fireproof compartment and is connected to the outside atmosphere through a ventilation duct, which is equipped with a fire damper.

[0060] It should be noted that the main oil tank room 10 can be directly accessed to the outdoor 0m floor through the anteroom and stairwell. The main oil tank room 10 uses daily forced ventilation to prevent the accumulation of oil and gas. In the event of a fire, the fire dampers can be closed to prevent the ventilation system from continuously supplying air to the main oil tank room 10, thus limiting the amount of oxidizer. At the same time, the fire doors of the main oil tank room 10 have been upgraded with watertight requirements, increasing the fire resistance rating of the main oil tank room 10 to 3 hours.

[0061] In summary, this utility model mainly achieves the following technical effects:

[0062] (1) Add camera 12. Add explosion-proof camera with pan-tilt unit 12 in the main oil tank room 10 and connect it to the video monitoring system to monitor the fuel leak point online and focus on monitoring areas with oil leak risk. Once a small fire occurs, it can be confirmed as early as possible. At the same time, video monitoring also makes it easier for firefighters to grasp the situation of personnel in the oil tank area during a fire.

[0063] (2) Add combustible gas detectors. Add combustible gas detectors in the near-ground area of ​​the main oil tank room 10, which is close to valves and flanges and other areas prone to leakage. Configure on-site alarms and send alarm signals to the fire control room or main control room. The value of the first-level alarm signal is ≤25% of the lower explosive limit of diesel vapor concentration, and the value of the second-level alarm signal is ≤50% of the lower explosive limit of diesel vapor concentration.

[0064] (3) Add fire hose interface 23 to the pipeline of the foam fire extinguishing system and connect it to the outdoor 0m floor interface (water pump connection) with fire hose so that firefighters can replenish foam liquid and / or fire water to enhance fire extinguishing.

[0065] (4) An outdoor interface is added for water injection in the main oil tank room 10. During the stage of fire development, the existing high-temperature water or lubricating oil filling and draining pipelines of the diesel engine in the plant are used to inject water into the main oil tank room 10 for cooling through the reserved pipeline interface at the -11.3m level (the matching flange is canceled in daily use, and the valve is normally open to avoid the inability to inject water in case of an accident) and the ladder opening at the top of the main oil tank room 10 at the -3.78m level. When injecting water, the fireproof cover at the ladder opening at the top of the main oil tank room 10 at the -3.78m level needs to be opened for ventilation. Firefighters can inject foam mixture to assist in fire fighting through the outdoor interface, or inject fire water to cool the main oil tank and adjacent rooms to avoid damage to the civil structure and prevent damage to the diesel generator set and other structures above it. Among them, the diameter of pipeline IV34 is expanded from the original DN25 and DN40 to DN100. The DN100 pipeline can provide a larger flow rate, which can inject water or foam mixture more quickly, thereby improving the efficiency of fire fighting and cooling.

[0066] The above embodiments are merely illustrative of the principles and effects of this utility model and are not intended to limit the scope of this utility model. Any person skilled in the art can modify or alter the above embodiments without departing from the spirit and scope of this utility model. Therefore, all equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this utility model should still be covered by the claims of this utility model.

[0067] Throughout this description, numerous specific details, such as examples of components and / or methods, are provided to provide a complete understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention may be practiced without one or more of these specific details or by other devices, systems, components, methods, parts, materials, components, etc. In other instances, well-known structures, materials, or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0068] Throughout this specification, references to "an embodiment," "an embodiment," or "a specific embodiment" mean that a particular feature, structure, or characteristic described in connection with an embodiment is included in at least one embodiment of the present invention, but not necessarily in all embodiments. Therefore, the various representations of the phrases "in one embodiment," "in an embodiment," or "in a specific embodiment" in different places throughout the specification do not necessarily refer to the same embodiment. Furthermore, a particular feature, structure, or characteristic of any specific embodiment of the present invention can be combined with one or more other embodiments in any suitable manner. It should be understood that other variations and modifications of the embodiments of the present invention shown herein may be based on the teachings herein and will be considered part of the spirit and scope of the present invention.

[0069] It should also be understood that one or more of the elements shown in the figures may be implemented in a more separate or more integrated manner, or may even be removed because they are inoperable in certain circumstances or provided because they may be useful for a particular application.

[0070] Furthermore, unless otherwise expressly stated, any arrows in the accompanying drawings should be considered illustrative only and not limiting. Additionally, unless otherwise stated, the term "or" as used herein is generally intended to mean "and / or". Where a term is anticipated to provide a separation or combination capability that is unclear, a combination of components or steps will also be considered as indicated.

[0071] As used herein and throughout the claims below, unless otherwise specified, “a” and “the” include the plural references. Similarly, as used herein and throughout the claims below, unless otherwise specified, “in” means “in” and “on”.

[0072] The above description of the embodiments shown in this utility model (including the content in the abstract of the specification) is not intended to be an exhaustive enumeration or to limit the utility model to the precise forms disclosed herein. Although specific embodiments and examples of the utility model have been described herein for illustrative purposes only, various equivalent modifications are possible within the spirit and scope of the utility model, as will be recognized and understood by those skilled in the art. As indicated, these modifications can be made to the utility model in accordance with the above description of the embodiments of the utility model, and such modifications will be within the spirit and scope of the utility model.

[0073] This document has generally described the systems and methods in detail to aid in understanding the present invention. Furthermore, various specific details have been set forth to provide a general understanding of embodiments of the present invention. However, those skilled in the art will recognize that embodiments of the present invention can be practiced without one or more specific details, or using other devices, systems, accessories, methods, components, materials, parts, etc. In other instances, well-known structures, materials, and / or operations have not been specifically shown or described in detail to avoid obscuring aspects of embodiments of the present invention.

[0074] Therefore, although the present invention has been described herein with reference to specific embodiments thereof, freedom of modification, various changes and substitutions are also within the scope of the above disclosure, and it should be understood that in some cases, certain features of the present invention may be adopted without departing from the scope and spirit of the invention and without corresponding use of other features. Thus, many modifications can be made to adapt a particular environment or material to the essential scope and spirit of the present invention. The present invention is not intended to be limited to the specific terms used in the following claims and / or the specific embodiments disclosed as the best mode of carrying out the present invention, but the present invention will include any and all embodiments and equivalents falling within the scope of the appended claims. Therefore, the scope of the present invention will be determined only by the appended claims.

Claims

1. A fire protection system for underground oil tanks in a nuclear power plant diesel engine room, wherein the underground oil tanks are arranged in a main oil tank compartment, a foam room is provided between adjacent main oil tank compartments, and an electrical room and a diesel engine hall are arranged sequentially above the main oil tank compartments, characterized in that, The utility model relates to a kind of diesel engine plant, which includes: Foam fire extinguishing system, the foam tank of foam fire extinguishing system is arranged in foam tank room, the spray head assembly of foam fire extinguishing system is arranged above underground oil tank of main oil tank room;Fire hose connector is provided on the pipeline of the foam fire extinguishing system in the foam room; Camera, the camera is arranged in the main oil tank room; Combustible gas detector, the combustible gas detector is arranged in the main oil tank room, and is close to the underground oil tank.

2. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 1, wherein, The camera is an explosion-proof camera with a cloud platform.

3. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 2, wherein, The combustible gas detector is used to measure the concentration of diesel vapor in the air in the main oil tank room, and sends an alarm signal according to the measured diesel vapor concentration.

4. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 3, wherein, The foam fire extinguishing system includes: Foam tank, the inlet of the foam tank is communicated by pipeline I and fire pipe network; Spray head assembly, the inlet of the spray head assembly is communicated by pipeline II and the outlet of the foam tank; Proportional mixer, the proportional mixer is connected between the pipeline I and the pipeline II by pipeline III.

5. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 4, wherein, Rain valve is provided on the pipeline III.

6. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 5, wherein, Valves are provided on the pipeline I and the pipeline II, and the valves are arranged in the foam tank room.

7. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 6, wherein, The underground oil tank is a horizontal oil tank, and the top of the underground oil tank is connected with an atmosphere pipe.

8. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 7, wherein, Smoke detector and flame detector are provided in the main oil tank room for detecting fire and sending an alarm signal.

9. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 8, wherein, A ladder opening is provided in the top of the main oil tank room, and a fireproof cover plate is cooperatively provided on the ladder opening.

10. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 9, wherein, The main oil tank room is an independent fire compartment, and is communicated with the outside atmosphere through a ventilation pipeline, and a fireproof valve is provided in the ventilation pipeline.

11. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 10, wherein, It also includes a high-temperature water or lubricating oil filling and discharging pipeline in the basement of the diesel engine plant, which includes: A first filling and discharging port is provided in the main oil tank room. A second filling and discharging port is provided in the electrical room. A 0-level filling and discharging port is communicated with the first filling and discharging port and the second filling and discharging port through a pipeline IV.

12. The nuclear power plant diesel plant vault in-ground oil tank fire protection system according to claim 11, wherein, The pipeline IV is a pipeline with a nominal diameter of 100 mm.

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