Tail end release device of compressed air foam fire extinguishing system and application of tail end release device in transformer substation

Abstract

The invention relates to a tail end release device of a compressed air foam fire extinguishing system and application of the tail end release device in a transformer substation. The device comprises a foam conveying pipeline, a spraying pipe, a spraying reinforcing pipe, an automatic angle adjusting device and a connecting flange, the vertically-arranged foam conveying pipeline is communicated with the horizontally-arranged spraying pipe through the connecting flange to form a T-shaped structure, and the outer end of the spraying pipe is further connected with the spraying reinforcing pipe. An automatic angle adjusting device is installed on the spraying reinforcing pipe, and a plurality of spraying holes are formed in the surface of the foam conveying pipeline, the surface of the spraying pipe and the surface of the spraying reinforcing pipe. When a fire occurs in the transformer substation, compressed air foam enters the spraying pipes and the spraying reinforcing pipes through the foam conveying pipelines and then is sprayed out from the spraying holes in a directional mode, and therefore the fire is extinguished. The automatic angle adjusting device collects the wind speed and the wind direction of the surrounding environment of the transformer substation and adjusts the spraying direction of the spraying reinforcing pipe in real time according to the wind speed and the wind direction, and therefore the spraying effect is enhanced.

Description

Technical Field

[0001] The present invention relates to the technical fields of safety emergency and fire prevention and extinguishing, and particularly relates to an end release device of a compressed air foam fire extinguishing system and its application in a substation. Background Art

[0002] The compressed air foam fire extinguishing system is an advanced fire extinguishing technology based on positive pressure to generate foam. The foam generated by this system is delicate, uniform, and has high stability, with excellent fire extinguishing performance and outstanding anti-burning and anti-rekindling capabilities. The compressed air foam fire extinguishing system shows unique technical advantages in anti-explosion shock, high temperature resistance, and resistance to smoke and dust, providing a reliable guarantee for the fire prevention and control needs of substations, marking a major breakthrough in the field of fixed fire extinguishing technology.

[0003] The end release device is a key component of the compressed air foam fire extinguishing system, which is mainly responsible for efficiently distributing foam. Common end release devices include compressed air foam spray pipes, compressed air foam guns, and compressed air foam fire monitors. Among them, the compressed air foam spray pipe has the advantages of wide coverage, flexible operation, and fire extinguishing agent saving, and performs more prominently in dealing with medium and small-scale fires.

[0004] However, for large oil-filled equipment such as substations, due to its high voltage level, large energy storage, and abundant oil storage, it is extremely difficult to extinguish the fire once it explodes. Especially in terms of layout form, structural characteristics, volume scale, and on-site conditions of the main transformer, there are significant differences from converter transformers and conventional oil-immersed transformers, making the fire situation more complex and severe, greatly increasing the difficulty of fire extinguishing. In short, the end release devices currently used in such application scenarios generally have the following problems:

[0005] (1) Substations often have characteristics such as large fire prevention zone spans and special high-fire-risk parts (such as high-voltage bushings, etc.). It is very difficult for the existing end release devices of the fire extinguishing system to achieve uniform coverage and accurate and efficient fire extinguishing;

[0006] (2) The spray angles of the currently common end release devices of the fire extinguishing system are fixed and cannot cope with the interference of variable environmental wind factors in the engineering environment where real substations are located. The fire extinguishing medium is easily blown away by the environmental wind and cannot achieve accurate spraying;

[0007] (3) The end release devices of the water spray and foam fire extinguishing systems currently used in substations are extremely vulnerable to the destruction of high-temperature flames and explosions, resulting in a significant reduction in fire extinguishing ability or even direct loss;

[0008] (4) The currently conventional end release devices of the fire extinguishing system and their application parameters are quite different from the boundary conditions of substations, and the existing fire extinguishing systems cannot meet the actual needs of substation fire prevention and control. Summary of the Invention

[0009] The main objective of the present invention is to solve the above problems existing in the prior art, and to provide a terminal release device for a compressed air foam fire extinguishing system applicable to a substation. This device has many advantages such as automatic angle adjustment, high temperature and explosion shock resistance, and high fire extinguishing efficiency. To achieve the above objective, the technical solution adopted by the present invention is as follows:

[0010] The present invention provides a terminal release device for a compressed air foam fire extinguishing system, mainly including a foam delivery pipeline 1, a spray pipe 2, a spray reinforcement pipe 3, and an automatic angle adjustment device 4. The foam delivery pipeline 1 and the spray reinforcement pipe 3 are both connected to the spray pipe 2 through flanges. The automatic angle adjustment device 4 is connected to the spray reinforcement pipe 3 and can drive it to rotate. Spray holes are provided on the foam delivery pipeline 1, the spray pipe 2, and the spray reinforcement pipe 3.

[0011] Further, the foam delivery pipeline 1 is arranged vertically, the spray pipe 2 and the spray reinforcement pipe 3 are arranged horizontally, and the spray reinforcement pipe 3 is located at the outer end of the spray pipe 2.

[0012] Further, the spray pipe 2 and the spray reinforcement pipe 3 are arranged in upper and lower layers around or on the side of the foam delivery pipeline 1.

[0013] Further, the spray holes on the foam delivery pipeline 1, the spray pipe 2, and the spray reinforcement pipe 3 and their distributions are the same or different.

[0014] Further, the spray holes on each pipeline are distributed in a straight line or crosswise (such as left - right cross, up - down cross). The distance between adjacent two spray holes is 500 - 1200 mm. The vertical angle of each spray hole is - 45° to 15°, and the horizontal angle is - 30° to 30°.

[0015] Further, the spray holes on each pipeline satisfy the following relationship:

[0016]

[0017] Wherein, S 喷淋孔 is the total release area of all spray holes (the sum of the areas of all spray holes), and S 系统输送管道 is the cross - sectional area of the foam delivery pipeline 1.

[0018] Further, the automatic angle adjustment device 4 includes a wind speed and direction sensor 8, a signal controller 9, and a driving device 10. The wind speed and direction sensor 8 is connected to the signal controller 9 and transmits wind speed and direction signals to it. The signal controller 9 is connected to the driving device 10 and controls it to start with the wind. The driving device 10 is connected to the spray reinforcement pipe 3 and drives it to rotate, thereby adjusting the spray direction and size of the spray reinforcement pipe 3 in real - time according to the ambient wind.

[0019] The second object of the present invention is to provide the application of the above-mentioned end release device of the compressed air foam fire extinguishing system in a substation.

[0020] Further, the substation is an enclosed indoor substation or an open outdoor substation.

[0021] Further, the substation includes at least two transformers arranged side by side, and high-voltage bushings are provided on at least one of the transformers.

[0022] Further, the end release device of the compressed air foam fire extinguishing system is arranged on at least one side (preferably the left and right sides) of the transformer, and the spray holes on the spray pipe 2 and the spray reinforcement pipe 3 are respectively directed at the transformer and the high-voltage bushing.

[0023] Through the unique design and layout of the spray holes of the present invention, combined with the angle automatic adjustment device that can adjust the spray direction in real time, the maximization of the spray coverage range is achieved, the uniformity of the foam distribution is effectively improved, the influence of environmental wind interference on the foam spraying effect is solved, and it has higher applicability and reliability in complex fire scenarios such as substations. Compared with the prior art, the arrangement mode, spacing, and spray angle of the spray holes in the end release device of the compressed air foam fire extinguishing system of the present invention are not fixed, but can be adjusted according to the equipment condition, position, and environmental wind, so as to protect the key protection parts of the transformer and provide more reliable and comprehensive protection for large substation equipment. More importantly, the whole set of equipment also has the advantages of high temperature resistance, explosion shock resistance, and fire extinguishing agent saving. Description of the Drawings

[0024] Figure 1 It is one of the overall connection schematic diagrams of the end release device of the compressed air foam fire extinguishing system.

[0025] Figure 2 It is the second of the overall connection schematic diagrams of the end release device of the compressed air foam fire extinguishing system.

[0026] Figure 3 It is the structural schematic diagram of the angle automatic adjustment device.

[0027] Figure 4 It is the application scenario schematic diagram of the end release device of the compressed air foam fire extinguishing system.

[0028] Figure 5 It is the height distribution schematic diagram of the spray holes / spray reinforcement holes.

[0029] Figure 6 It is the spacing distribution schematic diagram of the spray holes / spray reinforcement holes.

[0030] Figure 7 It is the vertical angle distribution schematic diagram of the spray holes / spray reinforcement holes.

[0031] Figure 8 It is a schematic diagram of the horizontal angle distribution of the spray holes / spray reinforcement holes.

[0032] Figure 9 It is a diffusion cloud map of the foam medium in the jet numerical simulation of finite element analysis.

[0033] Figure 10 It is a cloud map of the covering effect of the foam medium in the jet numerical simulation of finite element analysis.

[0034] Reference numerals: 1 - foam delivery pipeline, 2 - spray pipe, 3 - spray reinforcement pipe, 4 - angle automatic adjustment device, 5 - spray hole, 6 - spray reinforcement hole, 7 - connecting flange, 8 - wind speed and direction sensor, 9 - signal controller, 10 - driving device, 11 - high-voltage bushing, 12 - main transformer, 13 - regulating and compensating transformer, 14 - slit. Detailed implementation manners

[0035] To enable those of ordinary skill in the art to fully understand the technical solutions and beneficial effects of the present invention, the following further detailed description is provided in conjunction with specific embodiments and the accompanying drawings.

[0036] Embodiment 1

[0037] As Figure 1 shown, a terminal release device of a compressed air foam fire extinguishing system applicable to a substation, the device includes a foam delivery pipeline 1, a spray pipe 2, a spray reinforcement pipe 3, an angle automatic adjustment device 4, and a connecting flange 7. Among them, the foam delivery pipeline 1 is vertically arranged along the longitudinal direction, and the top of the foam delivery pipeline 1 is horizontally and symmetrically connected to the spray pipe 2 through the connecting flange 7, thereby forming a T-shaped spray pipeline. A spray reinforcement pipe 3 is connected to the end of the left or right spray pipe 2, and an angle automatic adjustment device 4 is connected to the spray reinforcement pipe 3. If necessary, spray reinforcement pipes 3 and angle automatic adjustment devices 4 can also be provided at the ends of the left and right spray pipes 2.

[0038] The structure of the angle automatic adjustment device 4 is as Figure 3 shown, including a wind speed and direction sensor 8, a signal controller 9, and a driving device 10. The wind speed and direction sensor 8 is connected to the signal controller 9 through a wire, the signal controller 9 is connected to the driving device 10 through a wire, and the driving device 10 is fixedly connected to the spray reinforcement pipe 3 and can drive it to rotate. The wind speed and direction sensor 8 can identify the ambient wind not exceeding 70 m / s. After receiving the signal sent by the wind speed and direction sensor 9, the signal controller 9 controls the driving device 10 to start, and drives the spray reinforcement pipe 3 to rotate through a motor, a transmission shaft or gears, etc., thereby realizing the real-time adjustment of the spray angle of the spray reinforcement hole 6.

[0039] A plurality of spray holes 5 and spray reinforcement holes 6 with different hole diameters, hole pitches, and spray angles are provided on the surfaces of the foam delivery pipe 1, the spray pipe 2, and the spray reinforcement pipe 3. Among them, the foam delivery pipe 1 and the spray pipe 2 cannot rotate, so the spray angles of the spray holes 5 on these pipes are fixed and cannot be adjusted automatically in real time; while the spray reinforcement pipe 3 can rotate under the control of the angle automatic adjustment device 4, so the spray angle of the spray reinforcement holes 6 can be adjusted automatically in real time. In addition, blocking members such as pipe caps, sealing plates, or flange covers are provided at the ends of each spray pipe 2 and spray reinforcement pipe 3. The function of the blocking member is to block the end of the pipe to prevent the foam used for fire extinguishing from leaking. The connecting flange 7 for connecting each pipe is specifically a threaded flange, which mainly includes flange bolts and metal sealing gaskets. The threaded flange is a flanged loose steel pipe flange with a turned-up ring plate type, and its execution standard is GB / T 9122, which can ensure the angle adjustability and sealing performance at the pipe connection. The sealing gasket is made of high-temperature resistant materials such as stainless steel to ensure good sealing performance under high-temperature conditions.

[0040] As Figures 5 - 8 shown, the structures and arrangement manners of the spray holes 5 and the spray reinforcement holes 6 are the same or similar. The following takes the spray holes 5 as an example for illustration. In terms of height, the spray holes 5 are arranged in a staggered and cyclic manner from left to right (i.e., low - high - low - high), as Figure 5 shown. In terms of pitch, the distance between two adjacent spray holes 5 is controlled between 500 mm and 1200 mm (as Figure 6 shown), and it can be adjusted flexibly according to the on-site situation. In terms of angle, the vertical angle of the spray hole 5 (i.e., the included angle between the spray hole and the horizontal plane, with the horizontal being 0°, counterclockwise being positive, and clockwise being negative) is controlled between -45° and 15°, as specifically shown in Figure 7 ; the horizontal angle of the spray hole 5 (i.e., the included angle between the spray hole and the pipe cross-section, with the vertical downward being 0°, clockwise being negative, and counterclockwise being positive) is controlled between -30° and 30°, as specifically shown in Figure 8 ; in terms of hole diameter, the hole diameter of the spray hole 5 is controlled below 12 mm, and for the case where multiple spray pipes or spray reinforcement pipes are arranged in upper and lower layers, the hole diameter of the spray holes on the upper middle row of spray pipes (such as 10 mm) > the hole diameter of the spray holes on the lower row of spray pipes (such as 8 mm). In addition, experiments have also found that the following relationship must be satisfied between each spray hole and the foam delivery pipe 1:

[0041]

[0042] Among them, S 喷淋孔 is the total release area of the spray holes and the spray reinforcement holes, and S 系统输送管道 is the cross-sectional area of the foam delivery pipe 1. That is to say, the total area of all the spray holes on the spray pipeline cannot exceed the cross-sectional area of the foam delivery pipe.

[0043] Example 2

[0044] Another set of end release devices of the compressed air foam fire extinguishing system applicable to substations provided by the present invention is as Figure 2 shown. The structure of this device is basically the same as that of Example 1, except for the number and arrangement of the spray pipes 2. In this embodiment, the number of spray pipes 2 is three, which are horizontally distributed on the left and right sides of the foam conveying pipeline 1 at a certain interval in the vertical direction and are connected to it. Spray strengthening pipes 3 are connected to the outer ends of the two spray pipes 2 on the left side, and an angle automatic adjustment device 4 is installed on the spray strengthening pipes 3.

[0045] The application scenario of the end release device of the compressed air foam fire extinguishing system described in the present invention is as Figure 4 shown. This substation includes high-voltage bushings 11 and main transformers 12 and tap-changing transformers 13 arranged side by side. There is a gap 14 between the two transformers. End A is the side farther from the firewall, and end B is the side closer to the firewall. Figures 1 - 2 The end release device of the compressed air foam fire extinguishing system shown is installed in this substation, and the foam conveying pipeline 1 is fixed at end A and / or end B. The spray pipes 2 are used to protect the main transformer 12, the tap-changing transformer 13 and the gap 14, and the spray strengthening pipes 3 are used to protect the high-voltage bushings 11. Specifically, the end release device of the compressed air foam fire extinguishing system in Example 1 or 2 can be installed at end A, or the device described in Example 1 can be installed at end A, and the device described in Example 2 can be installed at end B at the same time.

[0046] According to the actual environment of the substation site, each pipeline can be designed with different lengths and installation heights. Among them, the installation height of the spray pipes 2 should generally be 1.6 meters higher than the surface of the transformer body, and the installation height of some spray pipes 2 should be slightly higher than the upper surface of the key protection parts of the transformer. The installation height of the spray strengthening pipes 3 should be more than 0.5 meters higher than the upper surface of the key protection parts of the transformer. When the fire protection system detects a fire in the substation, the compressed air foam enters each spray pipe 2 and spray strengthening pipe 3 through the foam conveying pipeline 1, and then sprays out directionally from the spray holes 5 or spray strengthening holes 6, so as to extinguish the fire.

[0047] To verify the effectiveness and reliability of the end release device of the compressed air foam fire extinguishing system described in the present invention, the devices described in Examples 1-2 were respectively installed at Figure 4 ends B and A of the scenario shown for finite element analysis simulation, and the results are as Figures 9 - 10 shown.

[0048] Figure 9It is the diffusion cloud map of the initial foam medium. The colored part in the figure is the spraying effect of the granulated foam, showing good distribution characteristics, which indicates that the spraying points of each spraying pipeline are spraying foam normally and releasing evenly. These spraying media diffuse orderly, stably and gradually towards the central substation model, forming a uniformly covered spraying layer. Figure 10 It is the cloud map of the covering effect of the foam medium. As the foam spraying process continues to advance, the surface of the transformer model is gradually covered by the foam medium until the set spraying requirements are met. It can also be seen from the figure that the foam spraying has excellent diffusion characteristics and can cover the key areas in the substation. The spraying system can effectively start to protect some structures in the substation at an early stage, including but not limited to Figure 4 the high-voltage bushing 11, the main transformer 12, the regulating and compensating transformer 13 and the gap 14 in the protection scenario shown.

[0049] All in all, the foam can effectively expand and cover every corner of the substation in a short time, achieving the overall covering effect of the substation model and the technical requirements of spraying uniformity, verifying that the present invention can achieve rapid fire extinguishing of the substation model under simulated fire conditions, and ensuring the rationality of the scheme and the fire extinguishing efficiency.

Claims

1. The terminal release device of the compressed air foam fire extinguishing system is characterized by: The device comprises a foam conveying pipeline, a spray pipe, a spray reinforcement pipe, and an automatic angle adjustment device. The foam conveying pipeline and the spray reinforcement pipe are both connected to the spray pipe. The automatic angle adjustment device is connected to the spray reinforcement pipe and can drive it to rotate. Spray holes are arranged on the foam conveying pipeline, the spray pipe and the spray reinforcement pipe.

2. The terminal release device of the compressed air foam fire extinguishing system according to claim 1, characterized in that: The foam delivery pipeline is arranged vertically, the spray pipe and the spray reinforcement pipe are arranged horizontally, and the spray reinforcement pipe is located at the outer end of the spray pipe.

3. The terminal release device of the compressed air foam fire extinguishing system according to claim 2, characterized in that: The spray pipes and the spray reinforcement pipes are arranged in layers on the side of the foam conveying pipeline along the vertical direction.

4. The terminal release device of the compressed air foam fire extinguishing system according to claim 1, characterized in that: The spray holes and their distribution on the foam delivery pipeline, the spray pipe and the spray reinforcement pipe are the same or different.

5. The terminal release device of the compressed air foam fire extinguishing system according to claim 4, characterized in that: The spray holes on each pipe are distributed in a straight line or in a staggered manner. The spacing between two adjacent spray holes is 500-1200mm. The vertical angle and horizontal angle of each spray hole are controlled between -45° and 15° and -30° and 30° respectively.

6. The terminal release device of the compressed air foam fire extinguishing system according to claim 5, characterized in that: The spray holes on each pipe satisfy the following relationship: Among them, S 喷淋孔 is the total release area of ​​all spray holes, S 系统输送管道 is the cross-sectional area of ​​the foam delivery pipe.

7. The terminal release device of the compressed air foam fire extinguishing system according to claim 1, characterized in that: The automatic angle adjustment device includes a wind speed and direction sensor, a signal controller, and a driving device. The wind speed and direction sensor is connected to the signal controller, the signal controller is connected to the driving device, and the driving device is connected to the spray reinforcement pipe and drives it to adjust the spray direction in real time according to the wind direction.

8. Application of the terminal release device of the compressed air foam fire extinguishing system according to any one of claims 1 to 7 in a substation.

9. The use according to claim 8, characterized in that: The substation is a closed indoor substation or an open outdoor substation, and comprises at least two transformers arranged side by side, at least one of which is provided with a high-voltage bushing.

10. The use according to claim 9, characterized in that: The compressed air foam fire extinguishing system terminal release device is arranged on one side or two opposite sides of the transformer, and the spray holes on the spray pipe and the spray reinforcement pipe are respectively facing the transformer and the high-voltage bushing.

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