An explosion-proof device for explosion and fire of ultra-high voltage converter transformer

Abstract

The present invention provides an explosion-proof device for explosion and fire of a UHV converter transformer, comprising a vertical support column and a horizontal support column vertically fixed to the vertical support column, wherein the vertical support column is arranged along the valve hall side of the converter transformer and the fire wall side on both sides of the valve hall, and an anti-impact plate is fixedly arranged on the side of the vertical support column and the horizontal support column close to the converter transformer, and a fire-fighting pipeline is arranged between the anti-impact plate and the valve hall or the fire wall, and a mounting hole is opened on the surface of the anti-impact plate, and a nozzle is connected to the fire-fighting pipeline through the mounting hole. The advantages of the present invention are: by arranging the anti-impact plate along the valve hall side and the fire wall side of the converter transformer, the fire-fighting pipeline is effectively protected to prevent the fire-fighting pipeline from being impacted by the explosion, and the installation position of the nozzle is hidden behind the anti-impact plate, thereby improving the explosion-proof performance.

Description

Technical Field

[0001] The present invention relates to the technical field of fire protection facilities for ultra-high voltage power transformer substations, and in particular to an explosion-proof device for explosion fires of ultra-high voltage converter transformers. Background Art

[0002] In long-distance power transmission, UHV DC transmission technology is implemented on a large scale in engineering applications because it has the characteristics of large transmission capacity, long transmission distance and small transmission loss compared with UHV AC transmission technology. However, in UHV transmission, a converter substation is required to convert DC to AC. The construction and operation costs of a converter substation far exceed those of an UHV AC substation with the same voltage level and transmission capacity. During the operation of the converter transformer, hundreds of tons of flammable transformer oil are filled inside. If a fault occurs inside the converter transformer, the converter transformer will physically explode under the action of the fault arc, and the converter transformer oil will also produce a large amount of flammable gas. The flammable gas and converter transformer oil will spray out from the weak parts / gaps of the converter transformer. When the concentration of the sprayed flammable gas and converter transformer oil in the air reaches the explosion limit, a chemical explosion will occur, accompanied by the overflow and combustion of the converter transformer oil, which will cause the fire to spread.

[0003] The current fixed fire extinguishing system includes a fire-fighting pipe and a nozzle arranged on the fire-fighting pipe. The fire-fighting pipe is arranged outside the BOX-IN (noise reduction device) of the converter transformer or arranged together with the BOX-IN close to the firewall and valve hall. The nozzle is arranged toward the converter transformer. When the fire-fighting pipe is arranged outside the BOX-IN, when a fire occurs in the converter transformer, the structure of the BOX-IN will melt and collapse, thereby exposing the internal converter transformer and related structures to the range of action of the fire-fighting system, so as to carry out fire-fighting operations. For example, the BOX-IN device with both sound insulation and fire-fighting modules disclosed in the patent application with publication number CN110180109A is a fire-fighting system with different fire-fighting media arranged outside the BOX-IN for fire-fighting operations.

[0004] When the bushing, bushing riser, tap changer, oil tank body and other parts explode and catch fire, the bushing, riser and BOX-IN (noise reduction facilities) and other facilities will be blown up. The blown-up parts and the explosion shock wave will also damage the nearby fire sprinklers, which will cause the entire fixed fire extinguishing system to fail. Failure to extinguish the fire in time will bring great safety hazards and economic losses. The main reasons are: (1) The destroyed water spray sprinklers, foam spray sprinklers, etc. will directly fail. (2) The damage of some sprinklers will affect the spray effect or foaming ability of other remaining sprinklers. The fire-fighting medium may leak from here, wasting a large amount of fire-fighting water or foam mixture, causing the fire-fighting system to lose pressure as a whole and unable to work normally. (3) The high temperature of the fire causes the fire branch pipe to deform and cannot cover the target area of ​​​​fire extinguishing, resulting in fire extinguishing failure. Overflow fire will also occur at the gaps in the converter transformer body caused by the explosion of the above parts. If the fire sprinklers corresponding to these parts are damaged in the explosion, the difficulty of fire fighting will be greatly increased.

[0005] In order to improve the explosion-proof performance of the fire-fighting system, the patent application with publication number CN106390337A discloses an explosion-proof device for the fire-fighting system pipe network used for AC transformer explosion fires. The explosion-proof device protects the fire-fighting pipeline. The explosion-proof device includes a frame composed of columns and explosion-proof beams and an explosion-proof steel mesh fixed on the frame. However, the explosion-proof steel mesh cannot block all objects, and the fire-fighting pipeline will still be impacted by the explosion; and the fire-fighting nozzle must pass through the explosion-proof steel mesh to directly act on the transformer enclosed by the explosion-proof device. Without effective protection of the nozzle, protecting the fire-fighting pipeline alone does not have much effect. The invention patent with publication number CN208911356U discloses a compressed air foam nozzle for flammable and explosive environments. The explosion-proof performance is improved by integrated molding, but the nozzle and the liquid inlet of the fire-fighting pipeline are still exposed to the outside, and there is a risk that the explosion of the converter transformer will damage the connection part of the nozzle or cause the pipeline to deform. Summary of the invention

[0006] The technical problem to be solved by the present invention is to provide a fire protection pipe explosion-proof device which can prevent the fire protection pipe from being affected by the explosion and can effectively protect the sprinkler.

[0007] The present invention solves the above technical problems through the following technical solutions: an explosion-proof device for explosion and fire of ultra-high voltage converter transformers, comprising a vertical support column and a horizontal support column vertically fixed to the vertical support column, the vertical support column is arranged along the valve hall side of the converter transformer and the fire wall side on both sides of the valve hall, the vertical support column and the horizontal support column are also fixedly provided with an anti-impact plate on the side close to the converter transformer, the fire-fighting pipe is between the anti-impact plate and the valve hall or the fire wall, the surface of the anti-impact plate is provided with an installation hole, and the nozzle is connected to the fire-fighting pipe through the installation hole.

[0008] The present invention effectively protects the fire-fighting pipe by arranging anti-impact plates along the valve hall side and the fire wall side of the converter transformer to prevent the fire-fighting pipe from being impacted by the explosion. At the same time, the sprinkler head is connected to the fire-fighting pipe through the mounting hole, so that the installation position of the sprinkler head is hidden behind the anti-impact plate, thereby improving the explosion-proof performance. Under high temperature conditions, the sprinkler head and the connecting branch pipe will not be deformed, thereby ensuring the enveloping effect of the fire-fighting system on the fire-fighting area.

[0009] Preferably, the end of the impact-resistant plate on the fire wall side away from the valve hall is further provided with a side impact-resistant plate vertically connected to the fire wall.

[0010] Preferably, explosion-proof crossbeams parallel to the transverse support columns and explosion-proof pillars parallel to the vertical support columns and fixedly connected to the transverse support columns are also fixedly connected between adjacent vertical support columns.

[0011] Preferably, the transverse support columns and the vertical support columns are fixed to the concrete foundation or the fire wall by welding or bolting, the transverse support columns are welded or screwed to the vertical support columns, the explosion-proof beams are welded or screwed to the vertical support columns, and the explosion-proof pillars are welded or screwed to the transverse support columns and the explosion-proof beams; the impact-resistant plates are fixed by welding or screwing.

[0012] Preferably, a mounting seat connected to the fire-fighting pipe is fixed on the inner side of the mounting hole, and the mounting seat is provided with an internal thread. The nozzle includes a dome-shaped release cone and a fixing tube fixedly connected to the release cone, and the surface of the fixing tube has an external thread that matches the internal thread of the mounting hole.

[0013] Preferably, the mounting seat comprises a fixing plate fixedly connected to the side of the anti-impact plate facing away from the converter transformer and a connecting pipe coaxial with the mounting hole, and both ends of the connecting pipe are respectively provided with internal threads connected to the sprinkler and the fire fighting pipe.

[0014] Preferably, the end of the connecting tube extends to be roughly coplanar with the side of the impact-resistant plate facing the converter transformer, and the position where the fixing plate and the connecting tube cooperate is inclined toward one side of the converter transformer to form a tapered transition section.

[0015] Preferably, the angle between the fixing plate and the tapered transition section is an obtuse angle, and the angle between the axial direction of the connecting pipe and the tapered transition section is an acute angle.

[0016] Preferably, a flat gasket and a spring gasket are arranged between the flat bottom surface of the release cone and the anti-impact plate.

[0017] Preferably, the surface of the release cone is provided with release holes, the sum of the areas of the release holes is not less than the cross-sectional area of ​​the fixed tube, and the diameter of the release holes is 3 to 10 mm.

[0018] The explosion-proof device for explosion fire of UHV converter transformer provided by the present invention has the advantages that: by setting anti-impact plates along the valve hall side and the fire wall side of the converter transformer, the fire-fighting pipe is effectively protected to prevent the fire-fighting pipe from being impacted by the explosion. At the same time, the nozzle passes through the mounting hole to communicate with the fire-fighting pipe, so that the installation position of the nozzle is hidden behind the anti-impact plate, the explosion-proof performance is improved, and the nozzle and the connecting branch pipe connecting the nozzle and the fire-fighting pipe will not be deformed under high temperature conditions, ensuring the enveloping effect of the fire-fighting system on the fire-fighting area. A side anti-impact plate is also set to prevent the explosion from affecting the fire-fighting pipe from the side, and the strength of the explosion-proof device is strengthened by the explosion-proof crossbeam and the explosion-proof pillar to improve the explosion-proof performance; the nozzle is fixed by a thread and a spring gasket is installed, which can improve the stability of the nozzle and facilitate disassembly and replacement; and the nozzle is close to the anti-impact plate to prevent the high temperature of the fire from causing the deformation of the fire-fighting pipe to affect the coverage of the nozzle; the conical transition section of the mounting seat can improve the axial support of the nozzle and prevent the impact force from acting on the nozzle to damage the mounting seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of an explosion-proof device for explosion and fire of a UHV converter transformer provided by an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of an impact-resistant plate of an explosion-proof device for explosion and fire of a UHV converter transformer provided by an embodiment of the present invention;

[0021] Figure 3 A schematic diagram of the use status of the explosion-proof device for explosion and fire of ultra-high voltage converter transformer provided by an embodiment of the present invention;

[0022] Figure 4 A schematic diagram of a mounting base for an explosion-proof device for explosion and fire of a UHV converter transformer provided by an embodiment of the present invention;

[0023] Figure 5 A schematic diagram of the cooperation between a mounting base and a nozzle of an explosion-proof device for explosion and fire of a UHV converter transformer provided by another embodiment of the present invention;

[0024] Figure 6 A schematic diagram of the cooperation between a mounting base and a nozzle of an explosion-proof device for explosion and fire of a UHV converter transformer provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0026] refer to Figure 1-3The present embodiment provides an explosion-proof device for explosion and fire of a UHV converter transformer, comprising a vertical support column 2 and a horizontal support column 3 vertically fixed to the vertical support column 2, wherein the vertical support column 2 is arranged along the valve hall side 11 of the converter transformer 1 and the fire wall side 12 on both sides of the valve hall side 11, and an anti-impact plate 4 is fixedly provided on the side of the vertical support column 2 and the horizontal support column 3 close to the converter transformer 1, a fire-fighting pipe (not shown) is located between the anti-impact plate 4 and the valve hall (not shown) or the fire wall 13, and an installation hole 41 is opened on the surface of the anti-impact plate 4, and a nozzle 5 passes through the installation hole 41 and is connected to the fire-fighting pipe.

[0027] In this embodiment, an impact-resistant plate 4 is arranged along the valve hall side 11 and the fire wall side 12 of the converter transformer 1 to effectively protect the fire-fighting pipe and prevent the fire-fighting pipe from being impacted by the explosion. At the same time, the nozzle 5 is connected to the fire-fighting pipe through the installation hole 41, so that the installation position of the nozzle 5 is hidden behind the impact-resistant plate 4, thereby improving the explosion-proof performance. Under high temperature conditions, the nozzle 5 and the connecting branch pipe (not shown) connecting the nozzle 5 and the fire-fighting pipe will not be deformed, thereby ensuring the enveloping effect of the fire-fighting system on the fire-fighting area.

[0028] refer to Figure 3 In order to completely protect the fire-fighting pipe, a side anti-impact plate 42 vertically connected to the fire wall 13 can be set at the end of the anti-impact plate 4 on the fire wall side 12 away from the valve hall. The side anti-impact plate 42 and the anti-impact plate 4, plus the fire wall 13, form a closed protection area.

[0029] The nozzle 5 is selected according to its adaptability to the fire-fighting medium. When using a compressed air foam nozzle, since it relies on a compressed air foam production device to foam at the front end of the fire-fighting system, damage to the nozzle will not affect the normal operation of the entire fire-fighting system. Therefore, it can be directly fixed in the mounting hole 41 for use; even if the compressed air foam nozzle is damaged in the explosion, it only involves local deformation or local rupture of the damaged nozzle, and will not cause the overall system to lose pressure. Other nozzles can still work normally, and the fire-fighting medium can still be sprayed out from the damaged nozzle, which will not affect the fire-fighting system's envelope of the fire-fighting area.

[0030] When using a nozzle 5 that relies on foaming at the end of the fire-fighting system to release the fire-fighting medium, local damage to the nozzle 5 will cause the entire system to lose pressure, affecting the use of the entire fire-fighting system. Therefore, an explosion-proof net (not shown) can be fixed outside the release end of the nozzle 5 to protect the nozzle 5. The explosion-proof net can maintain a certain gap with the nozzle 5 for buffering. The structure, material and fixing method of the explosion-proof net can be selected and determined by technical personnel in this field according to needs, and will not be described in detail in this application.

[0031] Refer to Figure 1, an explosion-proof crossbeam 6 parallel to the transverse support column 3 and an explosion-proof pillar 7 parallel to the vertical support column 2 and fixedly connected to the transverse support column 3 are also fixedly connected between adjacent vertical support columns 2; in this embodiment, the vertical support columns 2 and the transverse support columns 3 are both made of H-shaped steel, the vertical support columns 2 are fixed to the concrete foundation or connected to the fire wall 13 by welding, screwing or pre-embedding, and the connection with the fire wall 13 can be fixed only with the help of other fixings fixed to the fire wall, the transverse support columns 3 are fixed to the concrete foundation or the fire wall 13 by welding or screwing, the transverse support columns 3 are welded or screwed to the vertical support columns 2, the explosion-proof crossbeam 6 is fixed to the vertical support columns 2 by welding or screwing, and the explosion-proof pillar 7 is fixedly connected to the transverse support column 3 and the explosion-proof crossbeam 6 by welding or screwing, and the impact-resistant plate 4 and the side impact-resistant plate 42 are fixedly connected to the fire wall, the concrete foundation, and the vertical support columns 2 and the transverse support columns 3 by screwing or welding.

[0032] refer to Figure 4 A mounting seat 8 connected to the fire protection pipe is fixed on the side of the mounting hole 41 facing away from the converter transformer 1. The mounting seat 8 is provided with an internal thread (not shown). Figure 5 The nozzle 5 includes a dome-shaped release cone 51 and a fixing pipe 52 fixedly connected to the release cone 51. The surface of the fixing pipe 52 has an external thread 53 that is threadedly matched with the internal thread of the mounting seat 8, so that the nozzle 5 is threadedly fixed on the mounting seat 8, and the installation position of the nozzle 5 is hidden behind the impact-resistant plate 4, which can protect the nozzle 5 during an explosion and prevent the nozzle 5 from being damaged.

[0033] The mounting seat 8 includes a fixing plate 81 fixedly connected to the side of the impact-resistant plate 4 facing away from the converter transformer 1 and a connecting pipe 82 coaxial with the mounting hole 41. The two ends of the connecting pipe 82 are respectively provided with internal threads connected to the nozzle 5 and the fire-fighting pipe, so that the fire-fighting medium in the fire-fighting pipe is led to the nozzle 5 for release through the transition of the connecting pipe 82. The end of the connecting pipe 82 facing the converter transformer 1 is roughly coplanar with the side of the impact-resistant plate 4 facing the converter transformer 1. The position where the fixing plate 81 and the connecting pipe 82 cooperate is inclined toward the side of the converter transformer 1 to form a conical transition section 83. The angle between the fixing plate 81 and the conical transition section 83 is an obtuse angle, and the angle between the axial direction of the connecting pipe 82 and the conical transition section 83 is an acute angle. Thus, the mounting seat 8 has axial resistance to prevent the impact force from pressing the nozzle 5 into the mounting hole 41 along the axial direction when an explosion occurs.

[0034] refer to Figure 5 In this embodiment, the fixing plate 81 can also be fixed to the side of the anti-impact plate 4 facing the converter transformer 1. Figure 4 Similarly, when the nozzle 5 is subjected to an axial explosion impact force, part of the pressure can be released through the deformation of the first transition plate 82 to prevent the nozzle 5 from being damaged.

[0035] A flat gasket (not shown) and a spring gasket (not shown) are arranged between the flat bottom surface of the release cone 51 and the impact-resistant plate 4, so as to improve the axial stability of the nozzle 5 and prevent shaking during explosion. Moreover, since the spring gasket is in a compressed state, it can provide axial stabilizing force when disassembling the nozzle, which is convenient for maintenance and replacement.

[0036] The arc surface of the release cone 51 is provided with release holes 54, the aperture and number of the release holes 54 are determined according to the fire extinguishing range and coverage of the UHV converter transformer. In this embodiment, the sum of the areas of the release holes 54 is not less than the cross-sectional area of ​​the fixed tube 52, and the diameter of the release holes 54 is 3 to 10 mm; the fire-fighting medium is sprayed out through the arc surface of the release cone 51 to extinguish the fire in the target area, and the fire-fighting medium is released evenly to form a single-point multi-directional coverage, which is beneficial to improving the adaptability of the UHV converter transformer in the event of an explosion fire.

[0037] refer to Figure 6 In this embodiment, the mounting seat 8 also includes an annular connecting plate 84 fixedly matched with the outer tube wall of the connecting tube 82, the axial direction of the connecting plate 84 is parallel to the axial direction of the connecting tube 82, the connecting plate 84 is fixedly matched with the fixing plate 81, and the fixing plate is fixed to the side of the anti-impact plate 4 facing the converter transformer 1.

[0038] The fixing plate 81 can be fixedly connected to the impact-resistant plate 4 by welding or screwing, and the connecting plate 84 can also be fixedly connected to the connecting pipe 82 by welding or screwing, but only one end close to the converter transformer can be welded during welding. It is preferred to use bolts (not shown) to radially connect the connecting pipe 82 and the connecting plate 84 inside the connecting pipe 82. The ends of the bolts can be hidden under the wall of the connecting pipe 82 and can be fixed using tools such as sockets and wrenches. In this way, multiple positions can be fixed along the axial direction.

[0039] The fixing plate 81 and the connecting plate 84 are perpendicular to each other. When the fixing plate 81 and the connecting plate 84 are directly connected, the structure of the nozzle 5 is the same as that of the nozzle 5. Figure 4 and 5 The structure is the same as that of the connecting pipe 82 after installation, and the matching state between the connecting pipe 82 and the mounting seat 8 is also the same as that of the connecting pipe 82 after installation. Figure 4 and Figure 5 same.

[0040] In this embodiment, a first transition plate 85 is further provided to connect the fixing plate 81 and the connecting plate 84. The first transition plate 85 is inclined toward the side of the impact-resistant plate 4 away from the converter transformer 1. At this time, the side of the release cone 51 connected to the fixing tube 52 is inclined to adapt to the first transition plate 85. After fixation, in addition to the spring gasket, the first transition plate 85 can also wrap the nozzle 5 to improve the fixing effect of the nozzle 5 and protect the nozzle 5.

Claims

1. An explosion-proof device for explosion and fire of ultra-high voltage converter transformer, characterized in that: It includes a vertical support column and a transverse support column vertically fixed to the vertical support column, the vertical support column is arranged along the valve hall side of the converter transformer and the fire wall side on both sides of the valve hall, the vertical support column and the transverse support column are also fixedly provided with an anti-impact plate on the side close to the converter transformer, the fire-fighting pipe is between the anti-impact plate and the valve hall or the fire wall, the surface of the anti-impact plate is provided with a mounting hole, and the nozzle is connected with the fire-fighting pipe through the mounting hole; an explosion-proof crossbeam parallel to the transverse support column is also fixedly connected between adjacent vertical support columns, a mounting seat connected with the fire-fighting pipe is fixed on the inner side of the mounting hole, the mounting seat includes a fixing plate fixedly connected to a side of the anti-impact plate facing away from the converter transformer and a connecting pipe coaxial with the mounting hole, the end of the connecting pipe extends to be roughly coplanar with a side of the anti-impact plate facing the converter transformer, the position where the fixing plate and the connecting pipe cooperate is inclined toward one side of the converter transformer to form a conical transition section, the angle between the fixing plate and the conical transition section is an obtuse angle, and the angle between the axial direction of the connecting pipe and the conical transition section is an acute angle.

2. The explosion-proof device for explosion and fire of UHV converter transformer according to claim 1, characterized in that: The end of the impact plate on the firewall side away from the valve hall is also provided with a side impact plate vertically connected to the firewall.

3. The explosion-proof device for explosion and fire of UHV converter transformer according to claim 1, characterized in that: Explosion-proof pillars are fixedly connected between adjacent vertical support pillars and are parallel to the vertical support pillars and fixedly connected to the transverse support pillars.

4. The explosion-proof device for explosion and fire of UHV converter transformer according to claim 1, characterized in that: The transverse support columns and the vertical support columns are fixed to the concrete foundation or the fire wall by welding or bolting, the transverse support columns are welded or screwed to the vertical support columns, the explosion-proof beams are welded or screwed to the vertical support columns, the explosion-proof pillars are welded or screwed to the transverse support columns and the explosion-proof beams; the impact-resistant plates are fixed by welding or screwing.

5. The explosion-proof device for explosion and fire of UHV converter transformer according to claim 1, characterized in that: The mounting seat is provided with an internal thread, and the nozzle comprises a dome-shaped release cone and a fixing pipe fixedly connected to the release cone, and the surface of the fixing pipe has an external thread matching the internal thread of the mounting hole.

6. The explosion-proof device for explosion and fire of UHV converter transformer according to claim 5, characterized in that: Both ends of the connecting pipe are respectively provided with internal threads connected with the sprinkler head and the fire fighting pipeline.

7. The explosion-proof device for explosion and fire of UHV converter transformer according to claim 6, characterized in that: A flat washer and a spring washer are arranged between the flat bottom surface of the release cone and the anti-impact plate.

8. The explosion-proof device for explosion and fire of UHV converter transformer according to claim 6, characterized in that: The surface of the release cone is provided with release holes, the sum of the areas of the release holes is not less than the cross-sectional area of ​​the fixed tube, and the diameter of the release holes is 3-10 mm.

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