Multi-scene fixed fire extinguishing system for electric power station and use method of multi-scene fixed fire extinguishing system

Abstract

The invention discloses a multi-scene fixed fire extinguishing system for an electric power station and a use method of the multi-scene fixed fire extinguishing system. The invention discloses a multi-scene fixed fire extinguishing system for an electric power station. The multi-scene fixed fire extinguishing system comprises a water supply system, a foam supply system, an inert gas supply system, a fire extinguishing medium mixing and applying system and a fire detection and control system, the fire extinguishing medium mixing and discharging system comprises a single-phase binary mixer, a multi-element multi-phase flow mixer connected with the single-phase binary mixer in series, a porous foam liquid discharging pipe around a transformer, a foam gun and a cable trench foam discharging pipe; the fire detection and control system comprises a fire control host, a temperature sensing fire detector and an image type fire detector. Gas fire extinguishing and foam fire extinguishing are combined, the fire extinguishing capacity is improved, the fire extinguishing application scene is expanded, and main fire hazard sources of the transformer substation can be covered; the image-type fire detector is coupled with the temperature-sensitive fire detector for fire identification, so that the accuracy of fire identification is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of fire protection, and in particular to a multi-scenario fixed fire extinguishing system for a power station and a method of using the same. Background Art

[0002] At present, the fixed fire extinguishing systems of substations are mainly water spray and synthetic foam spray fire extinguishing systems. The water spray fire extinguishing system mainly relies on the cooling and cooling effects of water mist to extinguish fires. It has a serious problem of insufficient fire extinguishing efficiency in extinguishing large oil fires; the synthetic foam spray system uses high-pressure gas to drive the release of fire extinguishing media, with a short foam supply time and limited fire extinguishing capacity. In addition, the premixed foam fire extinguishing medium used has a short shelf life and poor insulation. Once it is sprayed by mistake, it cannot be stopped midway, which can easily cause problems such as transformer tripping. In recent years, compressed air foam fire extinguishing systems have been initially applied in UHV DC stations. The fire extinguishing ability of the compressed air foam system has been significantly improved compared with water spray and foam spray, but the system is complex in composition, has high power consumption, and has high cost and maintenance costs. In addition, a large amount of air will be introduced during the foaming process, which is not conducive to the effect of the foam fire extinguishing system to isolate oxygen. The above-mentioned fixed fire extinguishing systems are all for oil-immersed transformers and cannot be used in other fire extinguishing scenarios such as cable trenches and reactors.

[0003] In addition to oil-immersed transformers, the main fire hazards in substations include cable trenches, oil-filled high-voltage reactors, current transformers, etc. The current situation is that for oil-immersed transformers and oil-filled high-voltage reactors, each is equipped with a fire extinguishing system. Most substation cable trenches are not equipped with fire extinguishing systems, and some substation cable trenches are equipped with dry powder fire extinguishing systems. The configurations of the above fire extinguishing systems are independent of each other, with high one-time investment costs and a large workload for later operation and maintenance. In addition, current transformer fires also occur from time to time in substations, but due to their large number, there is currently no fire extinguishing system, and conventional fire extinguishers in substations cannot effectively extinguish current transformer fires.

[0004] The existing substation fixed fire extinguishing system, whether it is a water spray fire extinguishing system, a foam spray fire extinguishing system or a compressed air foam system, mainly uses temperature detectors (mainly temperature sensing cables) and flame detectors for fire detection. The fire signal is set as three detection signals (two temperature sensing cable start signals and one flame detector start signal). Receiving two signals can be judged as a fire signal. Due to the limitation of the strength of the material itself, the temperature sensing cable is easily damaged during the long-term operation and maintenance process, resulting in its inability to perform its normal function. In addition, when a fire occurs, the temperature sensing cable is often damaged and cannot sound a fire alarm. In order to enhance the accuracy of fire detection, a "flame detector" is usually added. However, the flame detector is easily interfered by the environment, resulting in a high false alarm rate of fire.

[0005] In addition, the above-mentioned fixed fire extinguishing systems are mainly water spray and foam spray fire extinguishing systems. The fire extinguishing medium release systems of the two are similar, both of which are mother pipe-branch pipe type. The mother pipe is the fire extinguishing medium supply pipe, and the branch pipe is fixed to the mother pipe through pipe fittings. An atomizing nozzle is fixed at the end of the branch pipe, which is used to atomize the fire extinguishing medium before release. Since the spray range and penetration of the fire extinguishing medium after atomization are limited, in order to improve the fire extinguishing effect, the branch pipe is usually protruding forward and as close to the protected object as possible within a safe range. Once the protected object catches fire and explodes, it is easy to blow up the nearby branch pipe, causing local decompression of the fire extinguishing medium release system, affecting the fire extinguishing effect. Summary of the invention

[0006] In order to solve the problems of insufficient explosion-proof and fire-resistant capabilities, low fire extinguishing efficiency, application scope limited to high-value oil-filled equipment such as large oil-immersed transformers, limited application scenarios, false alarms and missed alarms of fires in fire extinguishing systems used in existing power stations such as substations, the present invention provides a multi-scenario fixed fire extinguishing system for power stations, which combines gas fire extinguishing and foam fire extinguishing to improve fire extinguishing capabilities, expand fire extinguishing application scenarios, and cover major fire hazard sources in substations; fire identification is performed by coupling image-type fire detectors with temperature-sensitive fire detectors, thereby improving the accuracy of fire identification.

[0007] To this end, the present invention adopts the following technical solution.

[0008] In a first aspect, the present invention provides a multi-scenario fixed fire extinguishing system for a power station, which includes a water supply system, a foam supply system, an inert gas supply system, a fire extinguishing medium mixing and release system, and a fire detection and control system; The water supply system comprises a fire water tank, a fire water tank outlet valve, a fire water pump inlet valve, a fire water pump and a fire water pump outlet valve which are sequentially connected through pipelines; The foam supply system comprises a foam liquid storage tank, a foam liquid storage tank outlet valve, a foam liquid pump inlet valve, a foam liquid pump and a foam liquid pump outlet valve which are sequentially connected through pipelines, and the foam liquid storage tank is filled with foam fire extinguishing agent concentrate; The inert gas supply system comprises an inert gas storage tank, an inert gas storage tank outlet valve and a gas flow regulator which are sequentially connected through pipelines; The fire extinguishing medium mixing and releasing system comprises a single-phase binary mixer, a multi-component multiphase flow mixer connected in series with the single-phase binary mixer, a ring transformer porous foam liquid releasing pipe, a foam gun and a cable trench foam releasing pipe, wherein the ring transformer porous foam liquid releasing pipe is used to be arranged in a ring around the transformer; the multi-component multiphase flow mixer is connected to the ring transformer porous foam liquid releasing pipe, the foam gun and the cable trench foam releasing pipe through pipelines respectively; the outlet of the fire pump outlet valve and the outlet of the foam liquid pump outlet valve are both connected to the single-phase binary mixer, and the outlet of the gas flow regulator is connected to the multi-component multiphase flow mixer; The water delivered by the fire water pump and the foam liquid delivered by the foam liquid pump are mixed in a single-phase binary mixer to form a foam water solution, and the mixed foam water solution and the inert gas output by the inert gas supply system are fully mixed and foamed in a multi-element multiphase flow mixer to form a ternary two-phase flow foam fire extinguishing liquid; The fire detection and control system includes a fire control host, a temperature-sensitive fire detector and an image-type fire detector; the image-type fire detector is used to be arranged above the transformer and send the detected image signal to the fire control host; the temperature-sensitive fire detector is used to send the detected temperature signal to the fire control host, and the fire control host judges the authenticity and source of the above signal and issues corresponding instructions.

[0009] The present invention combines gas fire extinguishing and foam fire extinguishing, improves the fire extinguishing ability, and expands the fire extinguishing application scenarios. Compared with traditional foam solutions, the ternary two-phase flow foam fire extinguishing liquid of the present invention has stable foam and long range. During the fire extinguishing process, a large amount of inert gas is released, and a liquid film is quickly formed on the surface of the burning object. At the same time, the suffocation effect is enhanced, thereby improving the fire extinguishing efficiency.

[0010] The fire extinguishing medium mixing and dispensing system of the present invention can adopt the "fixed-moving combined" fire extinguishing liquid dispensing method of the foam gun, thereby expanding the application scope of the fire extinguishing system; the multi-component multiphase flow mixer of the present invention can adopt the "inert gas active foaming" method, thereby reducing the mass of the fire extinguishing liquid, and the fire hose filled with the fire extinguishing liquid is also lighter. The foam gun using this fire extinguishing liquid is easier to operate than the conventional foam gun.

[0011] Furthermore, the water supply system also includes a fire water pump outlet recirculation valve, the inlet of the fire water pump outlet recirculation valve is connected to the fire water pump outlet valve, and the outlet of the fire water pump outlet recirculation valve is connected to the fire water tank, so that the circulation of fire water is realized through the fire water pump outlet recirculation valve.

[0012] Furthermore, the water supply system also includes a desalination device inlet valve, a desalination device and a desalination device outlet valve connected in sequence through pipelines, the outlet of the desalination device outlet valve is connected to a fire water tank, and the inlet of the desalination device inlet valve is connected to a water outlet pipeline of the fire water tank.

[0013] Furthermore, a conductivity meter for measuring fire water is provided on the water outlet pipe of the fire water tank, and a fire water flow meter is provided on the pipe connecting the fire water pump outlet valve and the single-phase binary mixer.

[0014] Furthermore, the foam supply system also includes a foam liquid pump outlet recirculation valve, the inlet of the foam liquid pump outlet recirculation valve is connected to the outlet of the foam liquid pump outlet valve, and the outlet of the foam liquid pump outlet recirculation valve is connected to the foam liquid storage tank, so that the circulation of the foam liquid is achieved through the foam liquid pump outlet recirculation valve.

[0015] Furthermore, the porous foam liquid dispensing pipe of the ring transformer is provided with a plurality of short tube nozzles and a plurality of micro-hole nozzles. By adopting the "short tube nozzles and micro-hole nozzles", there are no protruding branch pipes, and even if a small number of short tube nozzles or micro-hole nozzles are damaged by the explosion of the burning object, it will not cause the decompression of the fire extinguishing medium dispensing system and affect the dispensing effect.

[0016] In the second aspect, the present invention provides a method for using the above-mentioned multi-scenario fixed fire extinguishing system of a power station, the content of which is as follows: when the fire control host determines that it is a true fire signal, the fire control host controls the start and stop of the water supply system, the foam supply system and the inert gas supply system and the opening of the valve, and adjusts the gas-liquid ratio of the ternary two-phase flow foam fire extinguishing liquid according to the source of the fire signal, and releases the ternary two-phase flow foam fire extinguishing liquid to the transformer, cable trench and other protected objects through the fire extinguishing medium mixing and release system to achieve fire fighting.

[0017] Furthermore, the method for extinguishing transformer fire is as follows: after determining that the fire signal comes from the transformer, the working mode of the fire control host is adjusted to the transformer fire extinguishing mode, the foam liquid pump and the fire water pump are started, the foam liquid is mixed with water, and then mixed with inert gas, and the gas-liquid ratio is adjusted to 4:1~7:1, and the flow rate is 3~25L / (m 2 ·min), and the ternary two-phase flow foam fire extinguishing liquid is applied to the transformer through the fire extinguishing medium mixing and application system to implement fire extinguishing.

[0018] Furthermore, the method for extinguishing a cable trench fire is as follows: after determining that the fire signal originates from the cable trench, adjust the working mode to the cable trench fire extinguishing mode, start the foam liquid pump and the fire water pump, mix the foam liquid with water, and then mix it with an inert gas, adjust the gas-liquid ratio to 8:1~15:1, and the flow rate is not less than 200L / min. The ternary two-phase flow foam fire extinguishing liquid is released to the fire location through the fire extinguishing medium mixing and release system to implement fire extinguishing.

[0019] Furthermore, the fire fighting method for other protected objects is as follows: after determining that the fire signal comes from other protected objects, adjust the working mode to the single foam gun fire extinguishing mode, start the foam liquid pump and the fire water pump, mix the foam liquid with water, and then mix it with inert gas, adjust the gas-liquid ratio to 15:1~22:1, and the flow rate is not less than 100L / min. Through the fire extinguishing medium mixing and release system, the ternary two-phase flow foam fire extinguishing liquid is aimed at the fire location to implement fire extinguishing.

[0020] The beneficial effects of the present invention are as follows: the present invention combines the advantages of gas fire extinguishing and foam fire extinguishing, improves the fire extinguishing ability, expands the application scenarios of fire extinguishing, and can cover the main fire hazards in substations; the foam of the ternary two-phase flow foam fire extinguishing liquid of the present invention is stable and has a long range. A large amount of inert gas is released during the fire extinguishing process, and a liquid film is quickly formed on the surface of the burning object. At the same time, the suffocation effect is enhanced, thereby improving the fire extinguishing efficiency; the accuracy of fire identification is improved by combining image recognition with temperature detection; the fire extinguishing foam is modified by desalting the fire water to reduce the impact on live standby operation.

[0021] The present invention adaptively adjusts the flow rate and gas-liquid ratio according to the type of fire source, improves the fire extinguishing efficiency, and expands the application scope and application scenarios of the system fire extinguishing. The present invention can be used in indoor and outdoor substations, pumped storage power stations, machine rooms, converter valve halls, integrated pipe galleries, cable tunnels, underground cable trenches, cable shafts and other occasions, and can also be used in raw coal bunkers, cable trenches, bridges, oil systems, oil storage tanks, coal docks and other places in power plants; after appropriate modification, it can also be used in hazardous chemical yards, car garages and other places. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 It is a structural schematic diagram of a multi-scenario fixed fire extinguishing system for a power station according to the present invention; Figure 2 It is a structural schematic diagram of the porous foam liquid dispensing tube of the ring transformer of the present invention; Figure 3 It is a control logic diagram of the method for using the multi-scenario fixed fire extinguishing system of the power station of the present invention; In the figure, 1. Fire water tank, 2. Conductivity meter, 3. Fire water tank outlet valve, 4. Desalination device inlet valve, 5. Desalination device, 6. Desalination device outlet valve, 7. Fire water pump inlet valve, 8. Fire water pump, 9. Fire water pump outlet valve, 10. Fire water pump outlet recirculation valve, 11. Fire water flow meter, 12. Foam liquid storage tank, 13. Foam liquid storage tank outlet valve, 14. Foam liquid pump inlet valve, 15. Foam liquid pump, 16. Foam liquid pump outlet valve, 17. Foam liquid pump outlet recirculation valve, 18. Single-phase binary mixer , 19. Inert gas storage tank, 20. Inert gas storage tank outlet valve, 21. Gas flow regulator, 22. Multi-component multiphase flow mixer, 23. Multi-component multiphase flow mixer outlet manual valve, 24. First ring transformer porous foam liquid release pipe front valve, 25. Second ring transformer porous foam liquid release pipe front valve, 26. Ring transformer porous foam liquid release pipe, 27. Image type fire detector, 28. Cable trench foam release pipe front valve, 29. Foam gun delivery pipe front valve, 30. Foam gun, 31. Short tube nozzle, 32. Microporous nozzle. DETAILED DESCRIPTION

[0022] The present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0023] Example 1 This embodiment provides a multi-scenario fixed fire extinguishing system for a power station, such as Figure 1 As shown, it consists of a water supply system, a foam supply system, an inert gas supply system, a fire extinguishing medium mixing and releasing system, and a fire detection and control system.

[0024] The water supply system includes a fire water tank 1, a conductivity meter 2, a fire water tank outlet valve 3, a desalination device inlet valve 4, a desalination device 5, a desalination device outlet valve 6, a fire pump inlet valve 7, a fire pump 8, a fire pump outlet valve 9 and a fire pump outlet recirculation valve 10. There are two of each of the fire pump inlet valve 7, the fire pump 8 and the fire pump outlet valve 9, which are composed of a fire pump inlet valve 7, a fire pump 8 and a fire pump outlet valve 9. The two groups are connected in parallel and connected in series in the outlet pipe of the water supply system. After one fire pump fails, there is still one fire pump that can work, which can effectively ensure the normal operation of the water supply system. The fire water pump outlet recirculation valve 10 can also be two, which are connected in series in the water outlet pipeline of the water supply system; its inlet is connected to the outlet of the fire water pump outlet valve 9, and the outlet of the fire water pump outlet recirculation valve 10 is connected to the inlet of the fire water tank 1. The fire water tank 1, the conductivity meter 2, the fire water tank outlet valve 3, the fire water pump inlet valve 7, the fire water pump 8, the fire water pump outlet valve 9 and the fire water pump outlet recirculation valve 10 form a water recirculation loop. The inlet of the desalination device inlet valve 4 is connected to the water outlet pipeline between the conductivity meter 2 and the fire water tank outlet valve 3. The fire water tank 1, the conductivity meter 2, the desalination device inlet valve 4, the desalination device 5 and the desalination device outlet valve 6 form a desalination circulation loop. The water in the fire water tank 1 is continuously desalted through the desalination circulation loop, and most of the impurity ions in the water in the fire water tank 1 can be removed, so that the water supply system outputs fine desalted water, and the resistivity of the fine desalted water is maintained at 5~10 megohms (MΩ), which improves the insulation of the fine desalted water. The conductivity meter 2 is used to detect the conductivity of the fine desalted water.

[0025] When the water supply system is in operation, the fire water pump inlet valve 7 and the fire water pump outlet valve 9 are both in the open state, and the fire water pump 8 delivers fire water to the single-phase binary mixer 18 in a quantitative manner. A fire water flow meter 11 is provided on the pipeline connecting the outlet of the fire water pump outlet valve 9 and the single-phase binary mixer 18, which is used to measure the flow rate of the desalted water.

[0026] The foam supply system comprises a foam liquid storage tank 12, a foam liquid storage tank outlet valve 13, a foam liquid pump inlet valve 14, a foam liquid pump 15, a foam liquid pump outlet valve 16 and a foam liquid pump outlet recirculation valve 17. There are two of each of the foam liquid pump inlet valve 14, the foam liquid pump 15 and the foam liquid pump outlet valve 16, and one group is formed by one foam liquid pump inlet valve 14, the foam liquid pump 15 and the foam liquid pump outlet valve 16. The two groups are connected in parallel and connected in series in the liquid outlet pipeline of the foam supply system. When one foam liquid pump fails, another foam liquid pump can still work, which can effectively ensure the normal operation of the foam supply system. The foam liquid pump outlet recirculation valve 17 can also be two, which are connected in series in the liquid outlet pipeline of the foam supply system; the inlet of the foam liquid pump outlet valve 16 is connected to the outlet of the foam liquid pump outlet recirculation valve 17, and the outlet of the foam liquid pump outlet recirculation valve 17 is connected to the inlet of the foam liquid storage tank 12. The foam liquid storage tank 12, the foam liquid storage tank outlet valve 13, the foam liquid pump inlet valve 14, the foam liquid pump 15, the foam liquid pump outlet valve 16 and the foam liquid pump outlet recirculation valve 17 form a foam liquid recirculation loop, and the foam liquid storage tank 12 is filled with foam fire extinguishing agent stock liquid (referred to as foam liquid). The foam liquid in this embodiment uses low conductivity viscosity-enhancing non-ionic gel foam liquid.

[0027] The outlet of the fire pump outlet valve 9 and the outlet of the foam pump outlet valve 16 are both connected to the single-phase binary mixer 18. When the foam supply system is in operation, the foam pump inlet valve 14 and the foam pump outlet valve 16 are in an open state, and the foam pump 15 delivers the foam liquid to the single-phase binary mixer 18 according to a quantitative quantity, and mixes with the refined desalted water delivered by the fire pump 8 to form a foam water solution, and the low-conductivity viscosity-increasing non-ionic gel foam liquid and the refined desalted water form a high-efficiency and high-resistance fire extinguishing liquid, thereby improving the safety of fire extinguishing and reducing the losses caused by the mis-spraying of the fire extinguishing system.

[0028] In this embodiment, the outlet flow rate of the foam liquid pump 15 is in a fixed proportional relationship with the outlet flow rate of the fire water pump 8, and the ratio between the two is 3:97, which can also be adjusted according to the concentration of the foam fire extinguishing agent stock solution.

[0029] The inert gas supply system comprises an inert gas storage tank 19, an inert gas storage tank outlet valve 20 and a gas flow regulator 21 connected in sequence through pipelines. The gas flow regulator 21 is used to adjust the gas flow in the inert gas supply system, and the outlet of the gas flow regulator 21 is connected to a multi-element multiphase flow mixer 22. The inert gas used is a mixture of one or more of nitrogen, carbon dioxide, heptafluoropropane and its halogenated alkanes. The foam water solution mixed in the single-phase binary mixer 18 and the inert gas output by the inert gas supply system are fully mixed and foamed in the multi-element multiphase flow mixer 22 to form a stable ternary two-phase flow foam fire extinguishing liquid with fire extinguishing effect. The present invention adopts the method of "active foaming of inert gas" to reduce the quality of the fire extinguishing liquid. The transmission distance of the fire extinguishing liquid can cover the entire substation, and the gas-liquid ratio can be adjusted according to the different types of fire sources of the ignition object, thereby realizing a set of protection system covering the main dangerous points of the entire substation.

[0030] This embodiment uses inert gas active foaming + low conductivity viscosity-enhancing non-ionic gel foam liquid to form a stable three-phase flow foam fire extinguishing liquid of inert gas + gel foam + water. Compared with traditional foam solutions, the foam of the three-phase flow foam fire extinguishing liquid is stable and has a long range. During the fire extinguishing process, a large amount of inert gas is released, and a liquid film is quickly formed on the surface of the burning object. At the same time, the suffocation effect is enhanced, thereby improving the fire extinguishing efficiency. This embodiment modifies all gas and liquid media used in the operation of the fire extinguishing system, and improves its electrical insulation, viscosity, environmental friendliness and other indicators while improving the overall fire extinguishing efficiency.

[0031] The fire extinguishing medium mixing and releasing system comprises a single-phase binary mixer 18, a multi-element multiphase flow mixer 22 connected in series with the single-phase binary mixer, a multi-element multiphase flow mixer outlet manual valve 23, a ring transformer porous foam liquid releasing pipe 26, a foam gun 30 and a cable trench foam releasing pipe. The ring transformer porous foam liquid releasing pipe 26 is used to be arranged in a ring around the transformer. The surface of the ring transformer porous foam liquid release pipe 26 is coated with a thin fire retardant coating; the multi-component multiphase flow mixer 22 is connected to the ring transformer porous foam liquid release pipe 26, the foam gun 30 and the cable trench foam release pipe through pipelines after passing through the multi-component multiphase flow mixer outlet manual valve 23; the multi-component multiphase flow mixer 22 is connected to the ring transformer porous foam liquid release pipe 26 by two pipelines, and the corresponding pipelines are respectively provided with a first ring transformer porous foam liquid release pipe front valve 24 and a second ring transformer porous foam liquid release pipe front valve 25; the pipeline connecting the multi-component multiphase flow mixer 22 and the cable trench foam release pipe is provided with a cable trench foam release pipe front valve 28; the pipeline connecting the multi-component multiphase flow mixer 22 and the foam gun 30 is provided with a foam gun delivery pipe front valve 29 for controlling the operation of the foam gun 30.

[0032] The fire detection and control system includes a fire control host, a temperature-sensitive fire detector and an image-type fire detector 27; the image-type fire detector 27 is used to be arranged above the transformer to send the detected image signal to the fire control host; the temperature-sensitive fire detector is used to send the detected temperature signal to the fire control host, and the fire control host judges the authenticity and source of the above signal and issues corresponding instructions.

[0033] like Figure 2 As shown, the ring transformer porous foam liquid dispensing pipe 26 is provided with a plurality of short tube nozzles 31 and a plurality of micro-hole nozzles 32, and has no protruding branch pipes. Even if a small number of short tube nozzles or micro-hole nozzles are damaged by the explosion of the burning object, it will not cause the ring transformer porous foam liquid dispensing pipe to lose pressure and affect the dispensing effect; the main body of the ring transformer porous foam liquid dispensing pipe is made of high-strength thickened stainless steel, and a thin fire-retardant coating is applied on the outer layer of the stainless steel, so that it can withstand 1 hour in a 1000°C environment to prevent the pipe from being deformed due to high temperature. Through these structural settings, the anti-explosion and high-temperature resistance capabilities of the fire extinguishing system are improved.

[0034] The power station multi-scenario fire extinguishing system of this embodiment is an inert gas foam fire extinguishing system that can adapt to multiple fire scenarios in substations. It uses inert gas for foaming and driving, shortens the start-up time of the fire extinguishing system, eliminates the introduction of combustible materials during the fire extinguishing process, and enhances the suffocation fire extinguishing effect.

[0035] Example 2 This embodiment provides a method for using the multi-scenario fixed fire extinguishing system of the power station described in Embodiment 1, the contents of which are as follows: when the fire control host determines that it is a true fire signal, the fire control host controls the start and stop of the water supply system, the foam supply system and the inert gas supply system and the opening of the valve, adjusts the gas-liquid ratio of the ternary two-phase flow foam fire extinguishing liquid according to the source of the fire signal, and releases the ternary two-phase flow foam fire extinguishing liquid to the transformer, cable trench and other protected objects through the fire extinguishing medium mixing and release system to achieve fire fighting.

[0036] like Figure 3 As shown in the figure, the method of extinguishing transformer fire is as follows: after determining that the fire signal comes from oil-filled equipment such as transformers, the working mode of the fire control host is adjusted to the transformer fire extinguishing mode, and the foam liquid pump and the fire water pump are started. After the foam liquid is mixed with water, it is mixed with inert gas, and the gas-liquid ratio is adjusted to 4:1~7:1, and the flow rate is 3~25L / (m 2 ·min), and the ternary two-phase flow foam fire extinguishing liquid is applied to the transformer through the fire extinguishing medium mixing and application system to implement fire extinguishing.

[0037] like Figure 3As shown, the method for extinguishing a cable trench fire is as follows: after determining that the fire signal comes from the cable trench, adjust the working mode to the cable trench fire extinguishing mode, start the foam liquid pump and the fire water pump, mix the foam liquid with water, and then mix it with the inert gas, adjust the gas-liquid ratio to 8:1~15:1, and the flow rate is not less than 200L / min. The ternary two-phase flow foam fire extinguishing liquid is released to the fire location through the fire extinguishing medium mixing and release system to implement fire extinguishing.

[0038] like Figure 3 As shown, the fire fighting method for other protected objects is as follows: after determining that the fire signal comes from other protected objects (such as current transformers, capacitor rooms, etc.), adjust the working mode to the single foam gun fire extinguishing mode, start the foam liquid pump and the fire water pump, mix the foam liquid with water, and then mix it with the inert gas, adjust the gas-liquid ratio to 15:1~22:1, and the flow rate is not less than 100L / min. Aim the ternary two-phase flow foam fire extinguishing liquid at the fire location through the fire extinguishing medium mixing and release system to implement fire extinguishing.

[0039] In transformer fire extinguishing or cable trench fire extinguishing mode, fire extinguishing can generally be carried out through the corresponding transformer porous foam liquid release pipe or cable trench foam release pipe; when necessary, the foam fire extinguishing liquid can be delivered to the foam gun through the foam gun delivery pipe, and the foam gun can be moved to achieve mobile fire extinguishing, that is, a "fixed and mobile combination" fire extinguishing liquid release method of fixed + foam gun is adopted.

[0040] The technical effects of the technical solutions described in the above two embodiments are as follows: 1) The porous foam liquid dispensing tube of the ring transformer is equipped with a "short tube nozzle + micro-hole nozzle". The surface of the porous foam liquid dispensing tube of the ring transformer is coated with fire-retardant coating, which improves the explosion resistance and high temperature resistance of the fire extinguishing system.

[0041] 2) The use of "inert gas active foaming + low conductivity viscosity-enhancing non-ionic gel foam liquid" improves the fire extinguishing efficiency of the fire extinguishing system.

[0042] 3) The flow rate and gas-liquid ratio can be adaptively adjusted according to the source of the fire, which improves the fire extinguishing efficiency and expands the application scope and application scenarios of the fire extinguishing system.

[0043] 4) Use low-conductivity viscosity-enhancing non-ionic gel foam liquid and finely treated water to form a high-resistance fire extinguishing liquid to improve fire extinguishing safety and reduce losses caused by system mis-spraying.

[0044] 5) The “active foaming of inert gas” method is adopted to reduce the mass of the foam fire extinguishing liquid. The transmission distance of the foam fire extinguishing liquid can cover the entire substation, thus realizing a full protection system for the main dangerous points of the substation.

[0045] 6) The "fixed-mobile combined" fire extinguishing liquid release method of a fixed release tube + foam gun expands the scope of use of the fire extinguishing system; due to the "inert gas active foaming" method, the mass of the foam fire extinguishing liquid is reduced, and the fire hose filled with the foam fire extinguishing liquid is also lighter. The foam gun using this foam fire extinguishing liquid is easier to operate than conventional foam guns.

[0046] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should be included in the protection scope of the present invention.

Claims

1. A multi-scenario fixed fire extinguishing system for power stations, characterized in that: Including water supply system, foam supply system, inert gas supply system, fire extinguishing medium mixing and release system and fire detection and control system; The water supply system comprises a fire water tank (1), a fire water tank outlet valve (3), a fire water pump inlet valve (7), a fire water pump (8) and a fire water pump outlet valve (9) which are sequentially connected via pipelines; The foam supply system comprises a foam liquid storage tank (12), a foam liquid storage tank outlet valve (13), a foam liquid pump inlet valve (14), a foam liquid pump (15) and a foam liquid pump outlet valve (16) which are sequentially connected through pipelines. The foam liquid storage tank (12) contains foam fire extinguishing agent concentrate. The inert gas supply system comprises an inert gas storage tank (19), an inert gas storage tank outlet valve (20) and a gas flow regulator (21) which are sequentially connected via a pipeline; The fire extinguishing medium mixing and releasing system comprises a single-phase binary mixer (18), a multi-component multiphase flow mixer (22) connected in series with the single-phase binary mixer, a ring transformer porous foam liquid releasing pipe (26), a foam gun (30) and a cable trench foam releasing pipe, wherein the ring transformer porous foam liquid releasing pipe (26) is used to be arranged in a ring around the transformer; the multi-component multiphase flow mixer (22) is connected to the ring transformer porous foam liquid releasing pipe (26), the foam gun (30) and the cable trench foam releasing pipe through pipelines respectively; the outlet of the fire pump outlet valve (9) and the outlet of the foam liquid pump outlet valve (16) are both connected to the single-phase binary mixer (18), and the outlet of the gas flow regulator (21) is connected to the multi-component multiphase flow mixer (22); The water delivered by the fire water pump (8) and the foam liquid delivered by the foam liquid pump (15) are mixed in a single-phase binary mixer (18) to form a foam water solution, and the mixed foam water solution and the inert gas output by the inert gas supply system are fully mixed and foamed in a multi-element multiphase flow mixer (22) to form a ternary two-phase flow foam fire extinguishing liquid; The fire detection and control system comprises a fire control host, a temperature-sensitive fire detector and an image-type fire detector (27); the image-type fire detector (27) is arranged above the transformer and sends the detected image signal to the fire control host; the temperature-sensitive fire detector is used to send the detected temperature signal to the fire control host, and the fire control host judges the authenticity and source of the above-mentioned signal and issues corresponding instructions.

2. According to claim 1, a multi-scenario fixed fire extinguishing system for a power station is characterized in that: The water supply system further comprises a fire pump outlet recirculation valve (10), the inlet of the fire pump outlet recirculation valve (10) is connected to the fire pump outlet valve (9), and the outlet of the fire pump outlet recirculation valve (10) is connected to the fire water tank (1).

3. The multi-scenario fixed fire extinguishing system for a power station according to claim 1 is characterized in that: The water supply system further comprises a desalination device inlet valve (4), a desalination device (5) and a desalination device outlet valve (6) which are sequentially connected via pipelines, wherein the outlet of the desalination device outlet valve (6) is connected to the fire water tank (1), and the inlet of the desalination device inlet valve (4) is connected to the water outlet pipeline of the fire water tank (1).

4. The multi-scenario fixed fire extinguishing system for a power station according to claim 3 is characterized in that: The water outlet pipeline of the fire water tank (1) is provided with a conductivity meter (2), and the pipeline for connecting the fire water pump outlet valve (9) and the single-phase binary mixer (18) is provided with a fire water flow meter (11).

5. The multi-scenario fixed fire extinguishing system for a power station according to claim 1 is characterized in that: The foam supply system further comprises a foam liquid pump outlet recirculation valve (17), the inlet of the foam liquid pump outlet recirculation valve (17) is connected to the outlet of the foam liquid pump outlet valve (16), and the outlet of the foam liquid pump outlet recirculation valve (17) is connected to the foam liquid storage tank (12).

6. The multi-scenario fixed fire extinguishing system for a power station according to claim 1 is characterized in that: The ring transformer porous foam liquid application pipe (26) is provided with a plurality of short tube nozzles (31) and a plurality of micro-hole nozzles (32).

7. The method for using the multi-scenario fixed fire extinguishing system of a power station according to any one of claims 1 to 6 is characterized in that: When the fire control host determines that it is a true fire signal, the fire control host controls the start and stop of the water supply system, the foam supply system and the inert gas supply system and the opening of the valve, adjusts the gas-liquid ratio of the ternary two-phase flow foam fire extinguishing liquid according to the source of the fire signal, and releases the ternary two-phase flow foam fire extinguishing liquid to the transformer, cable trench and other protected objects through the fire extinguishing medium mixing and release system to achieve fire fighting.

8. The method for using the multi-scenario fixed fire extinguishing system of a power station according to claim 7 is characterized in that: The method of extinguishing transformer fire is as follows: after determining that the fire signal comes from the transformer, the working mode of the fire control host is adjusted to the transformer fire extinguishing mode, the foam liquid pump and the fire water pump are started, the foam liquid is mixed with water, and then mixed with inert gas, and the gas-liquid ratio is adjusted to 4:1~7:1, and the flow rate is 3~25L / (m 2 ·min), and the ternary two-phase flow foam fire extinguishing liquid is applied to the transformer through the fire extinguishing medium mixing and application system to implement fire extinguishing.

9. The method for using the multi-scenario fixed fire extinguishing system of a power station according to claim 7 is characterized in that: The method for extinguishing cable trench fire is as follows: After determining that the fire signal comes from the cable trench, adjust the working mode to the cable trench fire extinguishing mode, start the foam liquid pump and the fire water pump, mix the foam liquid with water, and then mix it with inert gas, adjust the gas-liquid ratio to 8:1~15:1, and the flow rate is not less than 200L / min. The ternary two-phase flow foam fire extinguishing liquid is released to the fire location through the fire extinguishing medium mixing and release system to implement fire extinguishing.

10. The method for using the multi-scenario fixed fire extinguishing system of a power station according to claim 7, characterized in that: The fire fighting method for other protected objects is as follows: After determining that the fire signal comes from other protected objects, adjust the working mode to the single foam gun fire extinguishing mode, start the foam liquid pump and the fire water pump, mix the foam liquid with water, and then mix it with inert gas, adjust the gas-liquid ratio to 15:1~22:1, and the flow rate is not less than 100L / min. Through the fire extinguishing medium mixing and release system, the ternary two-phase flow foam fire extinguishing liquid is aimed at the fire location to implement fire extinguishing.

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