Converter station valve hall dry type reactor fire extinguishing spraying mechanism and spraying device

Abstract

The invention discloses a converter station valve hall dry type electric reactor fire extinguishing spraying mechanism and a spraying fire extinguishing device. The converter station valve hall dry type electric reactor fire extinguishing spraying mechanism comprises a foam inlet pipeline, an atomization nozzle, a transverse pipe, an outer ring pipeline, an inner ring pipeline, a first spraying pipe and a second spraying pipe. An atomizing nozzle is arranged at the bottom of the foam inlet pipeline, at least one circle of inner ring pipeline and at least one circle of outer ring pipeline are sequentially and coaxially arranged on the outer ring of the foam inlet pipeline from inside to outside, and the outer ring pipeline, the inner ring pipeline and the foam inlet pipeline are communicated with one another through transverse pipes; the bottom of the outer ring pipeline inclines inwards to be provided with a first spraying pipe, and the bottom of the inner ring pipeline is vertically provided with a second spraying pipe. The fire extinguishing device has the beneficial effects that through inward inclination of the first spraying pipes, vertical arrangement of the second spraying pipes and combined spraying of the atomizing nozzles, comprehensive three-dimensional covering of objects to be extinguished is achieved, and the fire extinguishing effect is enhanced.

Description

Technical Field

[0001] This invention relates to the field of fire protection technology for power equipment, and in particular to a fire-extinguishing sprinkler mechanism and sprinkler device for dry reactors in converter station valve halls. Background Technology

[0002] Dry-type reactors are key equipment in converter stations (substations). They are typically coreless air coils that can be arranged vertically, horizontally, or in a triangular pattern. Their core function is to provide impedance, especially when a short circuit occurs in the power system. They can effectively limit the huge short-circuit current and maintain the stability of the bus voltage, thereby ensuring the safe operation of the power grid and non-faulty line equipment.

[0003] Currently, dry-type reactors have been applied in the valve halls of UHVDC flexible DC transmission projects. Due to the overvoltage and insulation coordination requirements of flexible DC transmission projects, surge arresters need to be installed between the converter valve terminals. These arresters have large energy, and the impact of arrester breakdown needs to be considered in engineering. If the arrester branch is not equipped with a dry-type reactor, a breakdown would be equivalent to a direct short circuit. The arrester is directly connected in parallel across the converter valve terminals, and after a short circuit, a capacitor discharge circuit is directly formed between the converter valve terminals. The short-circuit current can instantaneously reach hundreds of kA, causing overcurrent in the entire converter valve arm and potentially leading to an explosion, which is extremely dangerous. Therefore, new flexible DC converter stations consider configuring series dry-type reactors in the surge arrester branches between the converter valve terminals. This can significantly suppress the rise of short-circuit current and protect the safe and stable operation of the converter valve.

[0004] However, dry-type air-core reactors face severe fire risks due to their unique structure and materials, such as flammable epoxy resin-glass fiber insulation. The causes of fires are complex and concealed, making it difficult to detect inter-turn short circuits in the early stages. Once a fire occurs, it spreads rapidly along the encapsulation and vertically through the gas channels inside the multi-layered structure, creating fire extinguishing blind spots. The fire develops very rapidly and is accompanied by the risk of secondary fires that can easily develop into phase-to-phase short circuits and potentially expand into power outages.

[0005] These unique fire characteristics make it difficult for existing water sprinkler systems to effectively absorb large water droplets, which can easily lead to insulation degradation and secondary short circuits; gas extinguishing systems rely on enclosed spaces and are at risk of failure outdoors or in larger spaces; foam spray is easily dispersed by wind and is difficult to cover the side walls of dry reactors and penetrate internal blind spots.

[0006] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0007] The technical problem to be solved by this invention is to solve the problem of low fire extinguishing efficiency of dry reactors.

[0008] The present invention solves the above-mentioned technical problems through the following technical means:

[0009] This invention claims protection for the fire-extinguishing sprinkler mechanism of the dry reactor in the valve hall of a converter station, including a foam inlet pipe, an atomizing nozzle, a horizontal pipe, an outer ring pipe, an inner ring pipe, a first sprinkler pipe, and a second sprinkler pipe;

[0010] An atomizing nozzle is installed at the bottom of the foam inlet pipe. At least one inner ring pipe and at least one outer ring pipe are coaxially arranged from the inside out on the outer ring of the foam inlet pipe. The outer ring pipe, inner ring pipe and foam inlet pipe are connected to each other through horizontal pipes.

[0011] The first spray pipe is installed at the bottom of the outer ring pipe, which slopes inward, while the second spray pipe is installed vertically at the bottom of the inner ring pipe.

[0012] The fire-extinguishing sprinkler mechanism for the dry reactor in the valve hall of the converter station claimed in this invention firstly, by tilting the first sprinkler pipe inward, the compressed air foam sprayed from the first sprinkler pipe is bundled into a column shape, which can not only accurately cover the periphery of the object to be extinguished, but also effectively resist wind scattering, offset the influence of outdoor wind load, and the foam landing loss rate is <5%.

[0013] Secondly, the second sprinkler pipe is arranged vertically, and together with the first sprinkler pipe is tilted inward, to achieve 98% coverage of the inside and outside of the object to be extinguished, reducing the inner blind zone by 70% and solving the problem of three-dimensional obstruction in fire extinguishing.

[0014] Then, an atomizing nozzle is installed at the center of the second spray pipe, which can use the compressed air foam of the main flow rate to cover the annular zone of combustible material distribution of the fire-fighting material. At the same time, the compressed air foam sprayed by the atomizing nozzle also covers the center of the cross-section of the fire-fighting material, so that the fire-fighting material is fully covered.

[0015] In summary, by combining the inward tilt of the first spray pipe, the vertical arrangement of the second spray pipe, and the atomizing nozzles, a comprehensive three-dimensional coverage of the fire-fighting material is achieved, enhancing the fire-fighting effect.

[0016] Preferably, the angle formed between the first spray pipe and the vertical line passing through the top of the first spray pipe is α, and α satisfies the following formula;

[0017] α = arctan(b / h) * K

[0018] Where α is the angle formed by the first spray pipe and the y-axis; b is the radial distance between the inner ring of the object to be extinguished and the outer ring of the outer ring pipe; h is the height distance between the inner ring pipe and the top surface of the object to be extinguished; and K is the instantaneous angle correction coefficient of the extinguishing source when it is sprayed out from the first spray pipe.

[0019] Further, a calculation formula for the included angle α is provided to verify the better clustering effect of the foam column formed by the first sprinkler pipe. Through specific calculation values, not only are more possibilities for setting up fire-extinguishing sprinkler mechanisms for dry reactors in converter station valve halls provided for different fire-fighting objects, improving applicability, but also, for different fire-fighting objects, better fire-extinguishing sprinkler mechanisms for dry reactors in converter station valve halls are precisely provided to achieve better fire-fighting effects.

[0020] Preferably, the horizontal pipe includes a first inner horizontal pipe, both ends of which are respectively connected to a four-way connector, and the corresponding two ends of the four-way connector are respectively connected to the two ends of a first semi-circular pipe. The first semi-circular pipe and the four-way connector together form an inner ring pipe.

[0021] Preferably, the horizontal pipe includes a second inner horizontal pipe, and the ends of the four-way connectors that are far apart from each other are all connected to one end of the second inner horizontal pipe. The other end of the second inner horizontal pipe is connected to a tee connector. The corresponding two ends of the tee connectors are respectively connected to the second semi-circular pipe. The second semi-circular pipe and the tee connectors together form an outer ring pipe.

[0022] The outer and inner ring pipes are arranged together to form a top-covering system for the fire extinguishing material. In fact, in actual use, there is no limitation to only one outer and inner ring pipe. For example, if the first and second outer horizontal pipes are still equipped with four-way connectors at their respective ends, then horizontal pipes, semi-circular pipes and four-way connectors can be stacked to form multiple outer and inner ring pipes.

[0023] Preferably, the foam inlet pipe includes a foam inlet elbow and a first four-way connector, the middle of the first inner horizontal pipe is connected to the first four-way connector, the top of the first four-way connector is connected to the foam inlet elbow, and the bottom of the first four-way connector is connected to the atomizing nozzle.

[0024] The second spray pipe is equipped with an atomizing nozzle at its center. The compressed air foam sprayed out at the main flow rate can be used to cover the annular zone where the combustibles of the fire are distributed. At the same time, the compressed air foam sprayed out by the atomizing nozzle can also cover the center of the cross-section of the fire, so that the fire is fully covered.

[0025] The present invention also claims protection for a sprinkler fire extinguishing device employing a fire extinguishing sprinkler mechanism for a converter station valve hall dry reactor, comprising a compressed air foam generating mechanism, a main pipeline mechanism, and a fire extinguishing sprinkler mechanism for a converter station valve hall dry reactor; the compressed air foam generating mechanism and the fire extinguishing sprinkler mechanism for a converter station valve hall dry reactor are connected via a main pipeline.

[0026] Compressed air foam is generated by a compressed air foam generating mechanism, transported to the dry-type reactor room by the main pipeline mechanism, and then sprayed to extinguish the fire on the dry-type reactor through the fire extinguishing sprinkler mechanism of the converter station valve hall, so that the whole process forms a complete fire extinguishing system.

[0027] Preferably, the compressed air foam generating mechanism includes a housing, a water and air supply structure, a foam liquid supply structure, a mixer, and a foam outlet pipe;

[0028] The output ends of the water and gas supply structure and the foam liquid supply structure are connected to one end of the mixer, which is arranged inside the housing cavity. The other end of the mixer is connected to the foam outlet pipe, which is connected to the main pipeline mechanism.

[0029] The water and gas supply structure is used to supply gas and water, and the foam liquid supply structure is used to supply foam liquid. They enter the mixer together and mix to form compressed air foam. After that, the foam foam flows out from the foam outlet pipe and enters the main pipeline mechanism. The compressed air foam generated by the compressed air foam generating mechanism is uniform and fine, with a foaming ratio of ≥7 times. It can effectively adhere to the multi-layer encapsulation surface of the dry reactor, rapidly reduce the combustion surface temperature and isolate oxygen.

[0030] Compressed air foam can suffocate epoxy resin fires in ≤30 seconds, significantly faster than traditional water spray. Furthermore, compressed air foam exhibits high stability and a water separation time >5 minutes, allowing it to cover burning materials for an extended period to prevent reignition. This makes it particularly suitable for concealed fires caused by inter-turn short circuits in dry-type reactors.

[0031] Preferably, the water and air supply structure includes a power motor, a coupling, a water pump body, a water pump inlet pipe, a water pump outlet pipe, an air compressor, and a synchronous belt;

[0032] The housing contains a power motor, a water pump body, and an air compressor. The drive shaft of the power motor is coaxially connected to the pump shaft of the water pump body. A water inlet pipe is installed on the housing. One end of the water inlet pipe extends out of the housing, and the other end of the water inlet pipe is connected to the water inlet of the water pump body. The water outlet of the water pump body is connected to one end of the water outlet pipe, and the other end of the water outlet pipe is connected to the mixer.

[0033] The air compressor crankshaft and the water pump body pump shaft are connected by synchronous belt drive, and the air compressor output end is connected to the mixer through the air outlet pipe.

[0034] Both the air compressor and water pump are powered by motors, avoiding energy waste, and are interconnected through their reasonable layout.

[0035] Preferably, the foam liquid supply structure includes a foam liquid pump unit, a foam liquid inlet pipe, and a foam liquid outlet pipe. The foam liquid inlet pipe is installed on the housing, with one end extending out of the housing and the other end connected to the inlet of the foam liquid pump unit. The outlet of the foam liquid pump unit is connected to the mixer through the foam liquid outlet pipe.

[0036] Preferably, the main pipeline structure includes a first horizontal pipe, a vertical pipe, a flange, and a second horizontal pipe. The foam outlet pipe is connected to one end of the first horizontal pipe, and the other end of the first horizontal pipe is connected to one end of the vertical pipe. The first horizontal pipe and the vertical pipe are perpendicular to each other. The other end of the vertical pipe is connected to the second horizontal pipe through the flange. The second horizontal pipe and the vertical pipe are perpendicular to each other. The second horizontal pipe is connected to the foam inlet elbow.

[0037] The main pipeline system delivers compressed air foam from the outdoor area of ​​the dry-type reactor to the indoor area of ​​the dry-type reactor, ensuring that the compressed air foam generating mechanism is located outdoors of the dry-type reactor, thus preventing damage to the compressed air foam generating mechanism from fire inside the dry-type reactor. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the fire-extinguishing sprinkler system for the dry reactor in the converter station valve hall according to Embodiment 1 of the present invention;

[0039] Figure 2 This is a front view of the fire-extinguishing sprinkler mechanism of the dry reactor in the converter station valve hall in Embodiment 1 of the present invention;

[0040] Figure 3 This is a longitudinal sectional view of the atomizing nozzle in Embodiment 1 of the present invention;

[0041] Figure 4 This is a schematic diagram of the structure of the spray fire extinguishing device in Embodiment 2 of the present invention;

[0042] Figure 5 This is a schematic diagram of the compressed air foam generating mechanism in Embodiment 2 of the present invention;

[0043] Figure 6 This is a simplified diagram of the piping of the compressed air foam generating mechanism in Embodiment 2 of the present invention.

[0044] 10. Foam elbow;

[0045] 11. First four-way connector;

[0046] 12. Atomizing nozzle;

[0047] 130. First inner horizontal tube; 131. Second inner horizontal tube; 132. First outer horizontal tube; 133. Second outer horizontal tube;

[0048] 140. Second left four-way connector; 141. Second right four-way connector;

[0049] 15. The first semi-circular pipe;

[0050] 160. First tee connector; 161. Second tee connector;

[0051] 17. The second semi-circular pipe;

[0052] 18. First spray pipe;

[0053] 19. Second spray pipe;

[0054] 20. First horizontal pipe; 21. Vertical pipe; 22. Flange; 23. Second horizontal pipe;

[0055] 301. Base; 302. Frame; 303. Sheet metal outer shell;

[0056] 310. Power motor; 311. Coupling; 312. Water pump inlet pipe; 313. Water pump body; 314. Water pump outlet pipe; 3140. Flow meter; 3141. Check valve; 315. Air compressor;

[0057] 32. Mixer;

[0058] 33. Foam outlet pipe;

[0059] 340. Foam liquid inlet pipe; 341. Foam liquid pump set. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0061] Example 1

[0062] See Figure 1 This embodiment requires protection of the fire-extinguishing sprinkler mechanism of the dry-type reactor in the converter station valve hall. The top of the fire-extinguishing sprinkler mechanism is connected to the fire extinguishing source, and the bottom is aligned with the object to be extinguished. Specifically, the fire-extinguishing sprinkler mechanism of the dry-type reactor in the converter station valve hall includes a foam inlet elbow 10, a first four-way connector 11, an atomizing nozzle 12, a first inner horizontal pipe 130, a second inner horizontal pipe 131, a first outer horizontal pipe 132, a second outer horizontal pipe 133, a second left four-way connector 140, a second right four-way connector 141, a first semi-annular pipe 15, a first three-way connector 160, a second three-way connector 161, a second semi-annular pipe 17, a first spray pipe 18, and a second spray pipe 19.

[0063] The fire extinguishing source is connected to the top of the foam inlet elbow 10. The foam inlet elbow 10 is an inverted L-shaped bend, and the bottom of the foam inlet elbow 10 is connected to the top of the first four-way connector 11.

[0064] The first four-way connector 11 is a four-threaded through-hole connector with a cross-shaped longitudinal section. An atomizing nozzle 12 is provided at the bottom of the first four-way connector 11. The two ends of the first four-way connector 11 are respectively connected to one end of the first inner horizontal tube 130 and the second inner horizontal tube 131. The axes of the first inner horizontal tube 130 and the second inner horizontal tube 131 are horizontal and parallel to each other.

[0065] The other end of the first inner horizontal tube 130 is connected to the right end of the second left four-way connector 140, and the other end of the second inner horizontal tube 131 is connected to the left end of the second right four-way connector. The second left four-way connector 140 and the second right four-way connector have the same shape and structure, and their transverse cross-sections are both cross-shaped.

[0066] The front end of the second left four-way connector 140, the front end of the second right four-way connector 141, and the rear end of the second left four-way connector 140 and the rear end of the second right four-way connector 141 are respectively connected by two sections of the first semi-circular pipe 15, which together form a complete inner ring pipe.

[0067] The left end of the second left four-way connector 140 is connected to one end of the first outer horizontal tube 132, and the other end of the first outer horizontal tube 132 is connected to the first three-way connector 160.

[0068] The right end of the second right four-way connector is connected to one end of the second outer horizontal pipe 133, and the other end of the second outer horizontal pipe 133 is connected to the second three-way connector 161. The second three-way connector 161 has the same shape and structure as the first three-way connector 160. Both are pipe fittings or three-way pipe fittings used to connect pipes to change the direction of liquid flow. Their transverse cross section is a horizontal "T" shaped structure.

[0069] The front end of the first tee connector 160, the front end of the second tee connector 161, the rear end of the first tee connector 160, and the rear end of the second tee connector 161 are respectively connected by two sections of the second semi-circular pipe 17, which together form a complete outer ring pipe; the outer ring pipe is coaxial with the inner ring pipe.

[0070] In fact, in actual use, there is no limit to only one outer ring pipe and one inner ring pipe. For example, if the first outer horizontal pipe 132 and the second outer horizontal pipe 133 are still provided with four-way connectors at their respective ends, then multiple outer ring pipes and inner ring pipes can be formed by superimposing horizontal pipes, semi-circular pipes and four-way connectors.

[0071] However, it should be noted that if the required number of outer and inner ring pipes have been stacked, the outermost outer ring pipe is connected to the corresponding horizontal pipe by a tee joint, or it can also be connected by a four-way joint, but the opposite end of the four-way joint needs to be sealed.

[0072] A second spray pipe 19 is connected to the bottom of the inner ring pipe, and the axis of the second spray pipe 19 is perpendicular to the axis of the inner ring pipe. A first spray pipe 18 is connected to the bottom of the outer ring pipe, and the first spray pipe 18 is inclined inward.

[0073] See Figure 2 and Figure 3 Establish a coordinate system with the outer ring pipe axis as the origin o, the second outer horizontal pipe 133 axis as the x-axis, and the longitudinal axis of the foam inlet elbow 10 as the y-axis.

[0074] The angle formed by the first spray pipe 18 and the y-axis is α, and α satisfies the following formula;

[0075] α = arctan(b / h) * K

[0076] Where α is the angle formed by the first spray pipe 18 and the y-axis; b is the radial distance between the inner ring of the object to be extinguished and the outer ring of the outer ring pipe; h is the height distance between the inner ring pipe and the top surface of the object to be extinguished; and K is the instantaneous angle correction coefficient of the extinguishing source when it is sprayed out from the first spray pipe 18.

[0077] Taking compressed air foam as the extinguishing source as an example, due to the adhesiveness and expansion of compressed air foam, the compressed air foam diffuses at the nozzle, causing the spray angle to expand outward. Considering the inner opening form of the first spray pipe 18, the right-angle inner opening K is 1.1, the chamfered opening K is 1.3, and the flared opening K is 1.4.

[0078] The fire-extinguishing sprinkler mechanism of the dry reactor in the converter station valve hall claimed in this embodiment firstly, by tilting the first sprinkler pipe 18 inward, the compressed air foam sprayed from the first sprinkler pipe 18 is bundled into a column shape, which can not only accurately cover the periphery of the object to be extinguished, but also effectively resist wind scattering, offset the influence of outdoor wind load, and the foam landing loss rate is <5%.

[0079] Secondly, the second sprinkler pipe 19 is arranged vertically and tilted inward in conjunction with the first sprinkler pipe 18 to achieve 98% coverage of the inside and outside of the object to be extinguished, reducing the inner blind zone by 70% and solving the problem of three-dimensional obstruction in fire extinguishing.

[0080] Then, an atomizing nozzle 12 is installed at the center of the second spray pipe 19. The compressed air foam sprayed out at the main flow rate can be used to cover the annular zone of combustible material distribution of the fire-fighting material. At the same time, the compressed air foam sprayed out by the atomizing nozzle 12 can also cover the center of the cross-section of the fire-fighting material, so that the fire-fighting material is fully covered.

[0081] In summary, by combining the inward tilt of the first spray pipe 18, the vertical arrangement of the second spray pipe 19, and the atomizing nozzle 12, a comprehensive three-dimensional coverage of the fire-fighting material is achieved, enhancing the fire-fighting effect.

[0082] Example 2

[0083] See Figure 4 and Figure 5 and Figure 6This embodiment requires protection of the sprinkler fire extinguishing device, and adopts the fire extinguishing sprinkler mechanism of the converter station valve hall dry reactor in Embodiment 1 for fire extinguishing of the dry reactor. Specifically, the compressed air foam generating device includes the fire extinguishing sprinkler mechanism of the converter station valve hall dry reactor, the main pipeline mechanism and the compressed air foam generating mechanism. The compressed air foam generating mechanism and the fire extinguishing sprinkler mechanism of the converter station valve hall dry reactor are connected through the main pipeline.

[0084] The compressed air foam generating mechanism is located outdoors of the dry-type reactor and is used to provide compressed air foam to the fire-extinguishing sprinkler system of the dry-type reactor in the converter station valve hall. Specifically, the compressed air foam generating mechanism includes a base 301, a frame 302, a sheet metal outer shell 303, a power motor 310, a coupling 311, a water pump inlet pipe 312, a water pump body 313, a water pump outlet pipe 314, a flow meter 3140, a one-way valve 3141, a mixer 32, a foam outlet pipe 33, a foam liquid inlet pipe 340, a foam liquid pump set 341, a foam liquid outlet pipe; an air compressor 315, and a synchronous belt.

[0085] The base 301 is square plate-shaped, and a frame 302 is welded to the upper surface of the base 301. The frame 302 is equipped with a shell sheet metal 303. The shell sheet metal 303, the frame 302 and the base 301 together enclose a complete box. Other components of the air foam generating mechanism are located inside the box cavity.

[0086] The frame 302 and the base 301 are not limited to welding, but can also be assembled, depending on the actual situation. Moreover, considering the maintenance and replacement of the fire extinguishing sprinkler mechanism of the dry reactor in the converter station valve hall in the future, the surface of the box is preferably equipped with a door and a heat dissipation window.

[0087] A power motor 310 is installed on the left side of the housing cavity. The power motor 310 is used to provide power. A water pump body 313 is installed on the right side of the power motor 310. The pump shaft of the water pump body 313 is arranged coaxially with the drive shaft of the power motor 310 and they are connected to each other by a coupling 311.

[0088] A water inlet pipe is installed on the housing. One end of the water inlet pipe extends out of the housing and is connected to the external water supply pipeline. The other end of the water inlet pipe extends into the housing and is connected to the water inlet of the water pump body 313. The water outlet of the water pump body 313 located at the top is connected to one end of the water outlet pipe. The other end of the water outlet pipe is connected to the mixer 32. The mixer 32 is connected to the foam outlet pipe 33. The foam outlet pipe 33 passes through the mounting hole provided on the side wall of the housing and is connected to the input end of the main pipeline mechanism.

[0089] The water pump body 313 is started by the power motor 310, so that water enters the inlet pipe, outlet pipe and mixer 32 in sequence from the external water supply pipe, and fills the mixer 32 with water.

[0090] In some embodiments, for measuring fluid flow rate, it is preferable to install a flow meter 3140 on the outlet pipe.

[0091] Furthermore, to prevent fluid backflow, one end of the outlet pipe away from the flow meter 3140 is connected to one end of the check valve 3141, and the other end of the check valve 3141 is connected to the mixer 32.

[0092] An air compressor 315 is installed at the rear of the water pump body 313. The air compressor 315 is driven by the water pump body 313 and is used to provide compressed air to the mixer 32. The crankshaft of the air compressor 315 is connected to the pump shaft of the water pump body 313 via a synchronous belt drive, which is existing technology and will not be described in detail. The output end of the air compressor 315 is connected to the mixer 32 through an air outlet pipe.

[0093] When the water pump body 313 is started, the air compressor 315 is turned on, and the air compressor 315 outputs compressed air, which enters the mixer 32 through the air outlet pipe.

[0094] A foam liquid inlet pipe 340 is installed on the housing. One end of the foam liquid inlet pipe 340 extends out of the housing and is connected to the external foam liquid supply pipeline. The other end of the foam liquid inlet pipe 340 is connected to the inlet of the foam liquid pump group 341. The outlet of the foam liquid pump group 341 is connected to the mixer 32 through the foam liquid outlet pipe.

[0095] When the foam liquid pump unit 341 is turned on, the foam liquid enters the foam liquid inlet pipe 340 and the outlet of the foam liquid pump unit 341 sequentially from the external foam liquid supply pipeline, and flows into the mixer 32.

[0096] Mixer 32 is a device that mixes two or more different items together. As can be seen from the above description, foam liquid, compressed air and water all enter mixer 32 and mix to form compressed air foam, which then flows out from foam outlet pipe 33 and enters the main pipeline mechanism.

[0097] It is worth mentioning that the foam liquid pump set 341, air compressor 315, water pump body 313 and power motor 310 are preferably mounted on the base 301 by bolts. However, in actual use, they are not limited to bolt mounting. They can also be fixed by welding or clips, which will not be elaborated further.

[0098] The main pipeline mechanism delivers compressed air foam from the outdoor area of ​​the dry-type reactor to the indoor area of ​​the dry-type reactor. Specifically, the main pipeline mechanism includes a first horizontal pipe 20, a vertical pipe 21, a flange 22, and a second horizontal pipe 23. The foam outlet pipe 33 is connected to one end of the first horizontal pipe 20, which extends from the outdoor area of ​​the dry-type reactor into the indoor area. The other end of the first horizontal pipe 20 is connected to one end of the vertical pipe 21, which is arranged along the inner wall of the dry-type reactor. The first horizontal pipe 20 and the vertical pipe 21 are perpendicular to each other. The other end of the vertical pipe 21 is connected to the second horizontal pipe 23 through the flange 22. The second horizontal pipe 23 is perpendicular to the vertical pipe 21. The second horizontal pipe 23 is connected to the input end of the fire extinguishing sprinkler mechanism of the dry-type reactor in the converter station valve hall, that is, the second horizontal pipe 23 is connected to the foam inlet elbow 10.

[0099] The fire sprinkler system for the dry-type reactor in the converter station valve hall is located directly above the dry-type reactor, and it is necessary to ensure that the outer ring pipe profile is larger than the outer wall profile of the dry-type reactor.

[0100] In this way, compressed air foam is generated by the compressed air foam generating mechanism, transported to the dry reactor room by the main pipeline mechanism, and then sprayed to extinguish the fire on the dry reactor through the fire extinguishing sprinkler mechanism of the converter station valve hall, so that the whole process forms a complete fire extinguishing system.

[0101] In fact, the compressed air foam generated by the compressed air foam generating mechanism is uniform and fine, with a foaming ratio of ≥7 times. It can effectively adhere to the multi-layer encapsulation surface of the dry reactor, rapidly reduce the temperature of the combustion surface and isolate oxygen.

[0102] Compressed air foam can suffocate epoxy resin fires in ≤30 seconds, significantly faster than traditional water spray. Furthermore, compressed air foam exhibits high stability and a water separation time >5 minutes, allowing it to cover burning materials for an extended period to prevent reignition. This makes it particularly suitable for concealed fires caused by inter-turn short circuits in dry-type reactors.

[0103] However, in existing technologies, due to the influence of wind load, the foam loss rate upon landing is high, thus the fire extinguishing effect is obviously not well utilized. In this invention, by using a double-ring spray pipe in conjunction with the fire extinguishing sprinkler mechanism of the dry reactor in the converter station valve hall, and by combining the outer ring pipe diameter larger than the dry reactor diameter, the first spray pipe 18 tilting inward and the second spray pipe 19 perpendicular, a portion of the sprayed compressed air foam can cover the outer surface of the dry reactor, achieving three-dimensional coverage, enhancing the fire extinguishing effect, perfectly achieving 98% coverage of the inner and outer windings of the dry reactor, reducing the inner blind zone by 70%, and solving the problem of three-dimensional fire shielding.

[0104] In conjunction with the atomizing nozzle 12, the compressed air foam sprayed out in the main flow rate can be used to cover the annular zone where combustibles are distributed on the cross-section of the dry reactor. At the same time, the compressed air foam sprayed out by the atomizing nozzle 12 can also cover the center position of the cross-section of the dry reactor, so that the dry reactor is fully covered.

[0105] Based on this, further information is provided regarding the angle α formed by the first sprinkler pipe 18 and the y-axis for fire suppression using existing dry-type reactors. Specifically, the outer diameter of commonly used dry-type reactors on the market is 1.6m, and the inner diameter is 1.2m.

[0106] Since the outer ring pipe diameter is larger than the dry-type reactor outer diameter of 1.6m, the outer ring pipe diameter is selected as 2m, resulting in b = (2-1.2) / 2 = 0.4m;

[0107] Based on the indoor height of the dry-type reactor, the distance h between the inner ring pipe and the top of the dry-type reactor is 12m;

[0108] The first spray pipe 18 is a spray pipe with a right angle at the inner opening;

[0109] Finally, it was found that the angle α formed by the first spray pipe 18 and the y-axis is α = arctan(0.4 / 12)*1.1 = 2.08, with a value of 2°.

[0110] The process of using this sprinkler fire extinguishing system to extinguish fires in dry-type reactors is as follows:

[0111] S1. The compressed air foam generating mechanism is activated, specifically by turning on the power motor 310, starting the water pump body 313, and allowing water to enter the inlet pipe, outlet pipe and mixer 32 sequentially from the external water supply pipeline, filling the mixer 32 with water.

[0112] At the same time, the air compressor 315 is driven by the water pump body 313, and the air compressor 315 outputs compressed air, which enters the mixer 32 through the air outlet pipe;

[0113] The foam liquid pump unit 341 is turned on, and the outlet foam liquid enters the foam liquid inlet pipe 340 and the outlet of the foam liquid pump unit 341 sequentially from the external foam liquid supply pipeline, and flows into the mixer 32. The foam liquid, water and compressed air are mixed to form compressed air foam.

[0114] S2. Compressed air foam is delivered by the main pipeline mechanism. Specifically, the compressed air foam enters the first horizontal pipe 20, the vertical pipe 21 and the second horizontal pipe 23 in sequence, and then enters the fire extinguishing sprinkler mechanism of the dry reactor in the converter station valve hall.

[0115] S3. The fire-extinguishing sprinkler system for the dry-type reactor in the converter station valve hall sprays compressed air foam sequentially through foam elbow 10 into the first inner horizontal pipe 130, then into the inner ring pipe, and then into the outer ring pipe through the second inner horizontal pipe 131. By combining the outer ring pipe diameter with the dry-type reactor diameter, the inward tilt of the first sprinkler pipe 18, and the perpendicularity of the second sprinkler pipe 19, a portion of the sprayed compressed air foam can cover the outer surface of the dry-type reactor, achieving three-dimensional coverage, enhancing the fire extinguishing effect, perfectly achieving 98% coverage of the inner and outer windings of the dry-type reactor, reducing the inner blind zone by 70%, and solving the problem of three-dimensional fire shielding.

[0116] In conjunction with the atomizing nozzle 12, the compressed air foam sprayed out in the main flow rate can be used to cover the annular zone where combustibles are distributed on the cross-section of the dry reactor. At the same time, the compressed air foam sprayed out by the atomizing nozzle 12 can also cover the center position of the cross-section of the dry reactor, so that the dry reactor is fully covered.

[0117] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A fire-extinguishing sprinkler system for the dry-type reactor in the valve hall of a converter station, characterized in that, Includes foam elbow (10), atomizing nozzle (12), horizontal pipe, outer ring pipe, inner ring pipe, first spray pipe (18) and second spray pipe (19); Atomizing nozzle (12) is installed at the bottom of the foam inlet pipe. At least one inner ring pipe and at least one outer ring pipe are coaxially arranged from the inside to the outside of the foam inlet pipe. The outer ring pipe, inner ring pipe and foam inlet pipe are connected to each other through a horizontal pipe. The first spray pipe (18) is installed at the bottom of the outer ring pipe with an inward inclination, and the second spray pipe (19) is installed vertically at the bottom of the inner ring pipe.

2. The fire-extinguishing sprinkler mechanism for the dry reactor in the converter station valve hall according to claim 1, characterized in that, The angle between the first spray pipe (18) and the vertical line passing through the top of the first spray pipe (18) is α, and α satisfies the following formula; α = arctan(b / h) * K Where α is the angle formed by the first spray pipe (18) and the y-axis; b is the radial distance between the inner ring of the object to be extinguished and the outer ring of the outer ring pipe; h is the height distance between the inner ring pipe and the top surface of the object to be extinguished; and K is the instantaneous angle correction coefficient of the extinguishing source when it is sprayed out from the first spray pipe (18).

3. The spraying mechanism according to claim 1, characterized in that, The horizontal pipe includes an inner horizontal pipe, with four-way connectors connected to both ends of the inner horizontal pipe. The four-way connectors are connected to both ends of the first semi-circular pipe (15) respectively. The first semi-circular pipe (15) and the four-way connectors together form an inner ring pipe.

4. The fire-extinguishing sprinkler mechanism for the dry reactor in the converter station valve hall according to claim 3, characterized in that, The horizontal pipe includes an outer horizontal pipe. The opposite ends of the four-way connectors are all connected to one end of the outer horizontal pipe, and the other end of the outer horizontal pipe is connected to a three-way connector. The corresponding two ends of the three-way connectors are respectively connected to the second semi-circular pipe (17). The second semi-circular pipe (17) and the three-way connectors together form an outer ring pipe.

5. The fire-extinguishing sprinkler mechanism for the dry-type reactor in the converter station valve hall according to claim 1, characterized in that, The middle part of the inner horizontal tube is connected to the first four-way connector (11), the top of the first four-way connector (11) is connected to the foam inlet elbow (10), and the bottom of the first four-way connector (11) is connected to the atomizing nozzle (12).

6. A sprinkler fire extinguishing device employing the fire extinguishing sprinkler mechanism of the dry reactor in the converter station valve hall according to any one of claims 1 to 5, characterized in that, It includes a compressed air foam generating mechanism, a main pipeline mechanism, and a spraying mechanism; the compressed air foam generating mechanism and the spraying mechanism are connected by a main pipeline.

7. The fire extinguishing sprinkler system for dry-type reactors in converter station valve halls according to claim 6, characterized in that, The compressed air foam generating mechanism includes a housing, a water and air supply structure, a foam liquid supply structure, a mixer (32), and a foam outlet pipe (33); The output ends of the water and gas supply structure and the foam liquid supply structure are connected to one end of the mixer (32), which is arranged inside the box cavity. The other end of the mixer (32) is connected to the foam outlet pipe (33), which is connected to the main pipeline mechanism.

8. The fire extinguishing sprinkler system for dry-type reactors in converter station valve halls according to claim 6, characterized in that, The water and gas supply structure includes a power motor (310), a coupling (311), a water pump body (313), a water pump inlet pipe (312), a water pump outlet pipe (314), an air compressor (315), and a synchronous belt; The housing cavity is equipped with a power motor (310), a water pump body (313) and an air compressor (315). The drive shaft of the power motor (310) is coaxially connected to the pump shaft of the water pump body (313). The housing is equipped with an inlet pipe. One end of the inlet pipe extends out of the housing, and the other end of the inlet pipe is connected to the inlet of the water pump body (313). The outlet of the water pump body (313) is connected to one end of the outlet pipe, and the other end of the outlet pipe is connected to the mixer (32). The crankshaft of the air compressor (315) and the pump shaft of the water pump body (313) are connected by synchronous belt drive, and the output end of the air compressor (315) is connected to the mixer (32) through the air outlet pipe.

9. The fire extinguishing sprinkler system for dry-type reactors in converter station valve halls according to claim 6, characterized in that, The foam liquid supply structure includes a foam liquid pump unit (341), a foam liquid inlet pipe (340), and a foam liquid outlet pipe. The foam liquid inlet pipe (340) is installed on the housing. One end of the foam liquid inlet pipe (340) extends out of the housing, and the other end of the foam liquid inlet pipe (340) is connected to the inlet of the foam liquid pump unit (341). The outlet of the foam liquid pump unit (341) is connected to the mixer (32) through the foam liquid outlet pipe.

10. The fire extinguishing sprinkler system for dry-type reactors in converter station valve halls according to claim 6, characterized in that, The main pipeline includes a first horizontal pipe (20), a vertical pipe (21), a flange (22), and a second horizontal pipe (23). The foam outlet pipe (33) is connected to one end of the first horizontal pipe (20), and the other end of the first horizontal pipe (20) is connected to one end of the vertical pipe (21). The first horizontal pipe (20) and the vertical pipe (21) are perpendicular to each other. The other end of the vertical pipe (21) is connected to the second horizontal pipe (23) through the flange (22). The second horizontal pipe (23) and the vertical pipe (21) are perpendicular to each other. The second horizontal pipe (23) is connected to the foam inlet elbow (10).

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