CN111346323A - Fire protection system for valve side sleeve of extra-high voltage converter transformer and use method - Google Patents
Fire protection system for valve side sleeve of extra-high voltage converter transformer and use method Download PDFInfo
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- CN111346323A CN111346323A CN202010221612.9A CN202010221612A CN111346323A CN 111346323 A CN111346323 A CN 111346323A CN 202010221612 A CN202010221612 A CN 202010221612A CN 111346323 A CN111346323 A CN 111346323A
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/12—Nozzles specially adapted for fire-extinguishing for delivering foam or atomised foam
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
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Abstract
The invention discloses a fire protection system for a valve side sleeve of an extra-high voltage converter transformer and a using method thereof. The system comprises an oil collecting pit, a compressed air foam generating device, a foam main pipe, a partition valve and a compressed air foam spraying system. The independent oil collection pit filled with the pebble layer is adopted, so that the flowing and spreading of transformer oil after the occurrence of accidents, the valve side sleeve and the valve side lifting seat are effectively limited, the fire scale is reduced to the maximum extent, the fire loss is reduced, and the safety of adjacent facilities and valve halls is protected. The compressed air foam spraying system adopts a spray pipe without a spray head and a branch pipe and is arranged close to a firewall, so that the damage of the explosion impact of a valve side sleeve on a foam release device is reduced to the maximum extent, and the safety and reliability of the system are improved. Therefore, the technical problem of fire prevention and control of the valve side sleeve of the extra-high voltage converter transformer is thoroughly solved, and the valve side sleeve can be used for the extra-high voltage converter transformer and other converter transformers.
Description
Technical Field
The invention relates to a power transformer fire extinguishing technology, in particular to a fire protection system for a valve side sleeve of an extra-high voltage converter transformer and a using method.
Background
In recent years, with the rapid development of the ultra-high voltage direct current transmission technology, dozens of ultra-high voltage direct current transmission projects are established in advance in China, and hundreds of ultra-high voltage converter transformers are provided. The extra-high voltage converter transformer is core equipment of an extra-high voltage direct current transmission project, and the safe and stable operation of the extra-high voltage converter transformer is the basis of the normal operation of the extra-high voltage direct current transmission project. However, the extra-high voltage converter transformer has high voltage level, large energy, large oil storage amount, tight arrangement, high operation temperature, high fire risk and great harm, and once a fire occurs, great economic and property loss can be caused, and the safe and stable operation of a power grid can be threatened seriously. Therefore, the extra-high voltage converter transformer should take effective fire safety protection measures.
At present, an extra-high voltage converter transformer is mainly arranged in a way that a valve side sleeve is inserted into a valve hall, and is divided into a converter transformer body area and a valve hall internal area by a firewall of the valve hall. The converter transformer body region is arranged outside and comprises an oil tank, a net side sleeve, an oil conservator and the like. The inner area of the valve hall mainly comprises a valve side lifting seat, a valve side sleeve, a valve group and the like. The existing fire-fighting measures (such as a water spray fire-extinguishing system and a foam spray fire-extinguishing system) mainly aim at the area of a converter transformer body, do not consider the area inside a valve hall yet, especially lack effective protective measures for valve side sleeve fires, easily form large-area flowing fire and high-temperature hot oil fire, and have great fire-fighting safety risks, particularly:
(1) the valve side sleeve pipe can burn out the valve hall when explosion and fire happen. Once the valve side sleeve is broken or exploded to cause fire, not only the transformer oil in the valve side sleeve leaks into the valve hall to form flowing fire, but also the oil in the converter transformer oil tank and the high-level conservator can be continuously input into the valve side sleeve under the action of gravity, and further dynamic overflowing fire and large-area flowing fire are formed, so that the safety of the whole valve hall is threatened.
(2) The fire disaster of the oil tank of the ultra-high voltage converter transformer and the network side sleeve can also spread to the valve hall, so that the valve hall is damaged. According to several recent cases of fire accidents of the ultra-high voltage converter transformer, the destructive property, the high temperature and the strong radiation of the fire in the main body area of the ultra-high voltage converter transformer are high, and leaked transformer oil can flow and spread to the inside of a valve hall, so that the valve hall is burnt.
The spray nozzles and the fire branch pipes of automatic fire extinguishing systems such as the existing water spray fire extinguishing system and the foam spray fire extinguishing system are greatly influenced by the explosion, fire and high temperature of the transformer, and are easily damaged by the flying parts and explosion shock waves, so that the whole system fails, and the system is not suitable for converter transformer sleeves with explosion danger. The existing automatic fire extinguishing systems such as water spray fire extinguishing systems, foam spray fire extinguishing systems and the like have limited fire extinguishing and re-burning resistance to transformer oil flowing in large area, and conventional measures such as accident oil discharge, fire bank construction and the like are not suitable for being used in a limited space of a valve hall, so that large-area flowing fire spreading is easily caused, and a large amount of valuable instruments and equipment in the valve hall are damaged.
Therefore, the fire protection measures of the existing extra-high voltage converter transformer cannot meet the fire protection requirements of the valve side sleeve and the valve hall, so that great fire safety hazards exist, and effective fire safety protection measures are urgently needed.
Disclosure of Invention
In view of the defects of the existing fire protection scheme, the invention provides a valve side sleeve fire protection system of an extra-high voltage converter transformer and a using method thereof, which can effectively prevent transformer oil from flowing and spreading in a valve hall, can quickly and efficiently extinguish high-temperature hot oil fire caused by the rupture or explosion of the valve side sleeve, and has an anti-explosion function, thereby solving the problem of fire prevention and control of the valve side sleeve.
The technical scheme adopted by the invention is as follows: a fire protection system for a valve side sleeve of an extra-high voltage converter transformer is characterized by comprising an oil collecting pit, a compressed air foam generating device, a foam main pipe, a partition valve and a compressed air foam spraying system, wherein the oil collecting pit is arranged right below a valve side sleeve and a lifting seat of the converter transformer penetrating into a valve hall, a supporting net rack is fixed in the middle of the oil collecting pit, and a pebble layer is laid on the supporting net rack and used for collecting inflow converter transformer oil; compressed air foam spraying system passes through the subregion valve and directly communicates with the foam main pipe, and compressed air foam spraying system arranges directly over valve side sleeve pipe and the rising seat that penetrate in the valve room, and hug closely the valve room and prevent hot wall, compressed air foam generating device passes through foam main pipe, subregion valve and compressed air foam spraying system intercommunication.
The compressed air foam spraying system comprises spraying pipes, foam conveying pipes and connecting pieces, wherein one end of each spraying pipe is closed, the other end of each spraying pipe is open and is provided with a compressed air foam inlet, a plurality of rows of release holes are uniformly distributed on the surfaces of the spraying pipes, and the foam conveying pipes are communicated with the two spraying pipes through the connecting pieces.
The height of the pebble layer paved in the invention is not less than 250mm, and the diameter of a single pebble is not less than 38 mm.
The compressed air foam spraying system is made of high-temperature-resistant metal materials.
The partition valve provided by the invention adopts any one of an electric valve, a pneumatic valve or a hydraulic valve.
A use method of a fire protection system for a valve side sleeve of an extra-high voltage converter transformer is characterized by comprising the following steps:
when a converter transformer valve side sleeve pipe is in an explosion fire, converter transformer oil flows into an oil collection pit through a pebble layer which is laid on a support net rack in the middle of the oil collection pit in advance by a system; the oil collecting pit is arranged right below the valve side sleeve penetrating into the valve hall and the lifting seat and is used for collecting the flowing converter transformer oil and preventing the fire from spreading.
And the compressed air foam generating device is automatically started or manually started in a linkage manner with the fire alarm and is arranged in an explosion area far away from the converter transformer.
And thirdly, starting to convey the compressed air foam by the foam main pipe which is arranged at a position which is not influenced or is less influenced by the explosion of the converter transformer and is communicated with the compressed air foam generating device.
And fourthly, opening the corresponding partition valve, and spraying the compressed air foam conveyed by the foam main pipe through a plurality of rows of release holes on the surface of the spray pipe of the compressed air foam spraying system.
And fifthly, penetrating compressed air foam sprayed by a compressed air foam spraying system which is arranged right above the valve side sleeve and the lifting seat in the valve hall and is horizontally attached to the firewall in the valve hall into each converter transformer, and fully covering the valve side sleeve, the lifting seat and the oil collecting pit which are penetrated in the valve hall.
And sixthly, forming a compressed air foam covering layer at the lifting seat, the valve side sleeve and the oil collection pit of the converter transformer, and finally extinguishing the open fire.
The compressed air foam spraying system provided by the invention has the set compressed air foam supply intensity of 1.5-16L/(min m & m)2）。
The working principle of the invention is as follows: when the valve side sleeve or the valve side lifting seat is exploded and has a fire disaster, the converter transformer oil leaks and freely flows into the lower oil collecting pit and permeates into a clearance area at the bottom of the oil collecting pit through the pebble layer, and only a small amount of transformer oil fire remains on the pebble layer and the top, so that the fire disaster combustion area and the fire disaster power are reduced to the maximum extent; the fire alarm system detects a fire or an attendant discovers the fire, the compressed air foam generating device is immediately automatically or manually started, the compressed air foam generating device generates high-stability compressed air foam according to preset flow and pressure, the compressed air foam is conveyed to the compressed air foam spraying system through a compressed air foam main pipe and a partition valve, the high-stability compressed air foam is sprayed towards a fire valve side sleeve pipe, a valve side lifting seat and an oil collecting pit, a high-stability foam covering layer is formed in the whole protection area while an open fire is extinguished, in addition, a layer of foam is sprayed and covered in the adjacent areas of the oil collecting pits at two sides, the open fire splashed to the adjacent converter transformer area is timely extinguished, and the valve side sleeve pipe and the valve side lifting seat which do not break down are protected.
The invention has the beneficial effects that:
1. the invention adopts the independent oil collecting pit filled with the pebble layer, effectively limits the flowing and spreading of the oil of the valve side sleeve, the valve side lifting seat and the converter transformer after an accident, reduces the fire scale to the maximum extent, reduces the fire loss and protects the safety of adjacent facilities and valve halls.
2. The invention adopts the compressed air foam spraying fire extinguishing technology based on the positive pressure foam generating mode, has the outstanding characteristics of long foam liquid separating time, high stability, strong fire extinguishing control capability, excellent re-burning resistance and the like, can quickly and effectively extinguish the transformer oil fire, stays above the pebble layer for a long time, isolates air, thoroughly extinguishes the fire in the oil collecting pit, and prevents re-burning.
3. The compressed air foam spraying system adopts the spray pipe without the spray head and the branch pipe and is arranged close to the firewall, so that the damage of the explosion impact of the valve side sleeve on the foam release device is reduced to the maximum extent, and the safety and the reliability of the system are improved.
4. The compressed air foam generating device is arranged far away from the explosion area, so that the generation of the compressed air foam is prevented from being influenced by explosion. The foam main pipe is arranged at a position which is not influenced or slightly influenced by the explosion of the transformer, such as underground, behind a firewall, inside channel steel and the like, so that the foam is conveyed without being influenced by the explosion, and the safety and reliability of the system are ensured.
5. The fire protection system has the advantages of advanced technology, safety, reliability, strong operability and anti-explosion function, has good fire extinguishing effect no matter a valve side sleeve explosion fire disaster in a valve hall or a converter transformer body flowing and spreading to the valve hall fire disaster, can effectively prevent transformer oil from flowing and spreading in the valve hall, thoroughly solves the technical problem of fire prevention and control of a valve side sleeve of an extra-high voltage converter transformer, and can be used for the extra-high voltage converter transformer and other converter transformers.
Drawings
FIG. 1 is a side view of an embodiment of the system of the present invention;
FIG. 2 is a top view of an embodiment of the system of the present invention;
FIG. 3 is a schematic view of an example of the compressed air foam spray system of FIGS. 2 and 3;
FIG. 4 is a graph of the foam coverage effect of the compressed air foam spray system of FIGS. 2 and 3;
FIG. 5 is a flow chart of a method of use of the system of the present invention.
Detailed Description
The invention will be further explained with reference to the following examples and the accompanying drawings.
As shown in fig. 1 to 4, the fire protection system for the valve-side sleeve of the extra-high voltage converter transformer comprises an oil collecting pit 1, a compressed air foam generating device 4, a foam main pipe 5, a partition valve 6 and a compressed air foam spraying system 7, wherein the oil collecting pit 1 is arranged right below a valve-side sleeve 11 and a lifting seat 10 of the converter transformer penetrating into a valve hall, a supporting net rack 2 is fixed in the middle of the oil collecting pit 1, a pebble layer 3 is laid on the supporting net rack 2, the height of the laid pebble layer 3 is not less than 250mm, and the diameter of a single pebble is not less than 38mm, and the oil collecting pit is used for collecting inflow converter transformer oil; compressed air foam spraying system 7 is directly communicated with foam main pipe 5 through partition valve 6, compressed air foam spraying system 7 is arranged right above valve side sleeve 11 and rising seat 10 of converter transformer penetrating into the valve hall and is tightly attached to valve hall firewall 12, and compressed air foam generating device 4 is communicated with compressed air foam spraying system 7 through foam main pipe 5 and partition valve 6. The compressed air foam spray trajectory 8 will be fully covered by the valve side bushing 11, the elevated seat 10 and the oil sump 1 penetrating into the valve hall.
The compressed air foam main pipe is arranged underground, or behind a fire wall, or is placed inside a protective facility and is arranged close to the fire wall.
As shown in figure 3, the compressed air foam spraying system 7 comprises a spraying pipe 7-1, a foam conveying pipe 7-2 and a connecting piece 7-3, wherein one end of the spraying pipe 7-1 is closed, the other end of the spraying pipe is open and is a compressed air foam inlet, a plurality of rows of release holes 7-4 are uniformly distributed on the surface of the spraying pipe, and the foam conveying pipe 7-2 is communicated with the two spraying pipes 7-1 through the connecting piece 7-3. The compressed air foam spraying system 7 is made of high-temperature-resistant metal materials.
The length of the spray pipe 7-1 is in the range of 1m to 20m, and the length of the spray pipe is set to 8 m; the diameter of the spray pipe 7-1 is in the range of 20 mm-200 mm (the diameter is determined according to the required foam solution flow rate), and the diameter of the embodiment is set as 80 mm; the distance between 7-4 of the surface release holes of the spray pipe 7-1 is within the range of 20 mm-100 mm (the distance is determined according to the flow of the foam solution required by unit length); the interval between the release holes 7 and 4 is set to 40mm in the embodiment; six rows (shown in figure 1) of release holes 7-4 are uniformly distributed on the surface of the spray pipe 7-1, the aperture of the release holes 7-4 is in the range of 1 mm-30 mm (the hole distance is determined according to the flow rate of the foam solution required by unit length), and the aperture of the embodiment is set to be 8 mm; the included angle between each row of the discharge holes is 5-35 degrees.
The net volume of the oil collection pit is not less than the oil quantity of the converter transformer leaked after the valve side lifting seat and the valve side sleeve explode or break. The size of the oil collecting pit can ensure that the converter transformer oil does not overflow after the valve side lifting seat and the sleeve are exploded or broken.
The partition valve 6 of the present embodiment is an electric ball valve of model Q941F-16C among electric valves.
As shown in FIG. 5, the use method of the fire protection system for the valve-side sleeve of the extra-high voltage converter transformer comprises the following steps:
when a converter transformer valve side sleeve pipe is in an explosion fire, converter transformer oil flows into an oil collection pit through a pebble layer which is laid on a support net rack on the upper portion of the oil collection pit in advance by a system; the oil collecting pit is arranged right below the valve side sleeve penetrating into the valve hall and the lifting seat and is used for collecting the flowing converter transformer oil and preventing the fire from spreading.
And the compressed air foam generating device is automatically started or manually started in a linkage manner with the fire alarm and is arranged in an explosion area far away from the converter transformer.
And thirdly, starting to convey the compressed air foam by the foam main pipe which is arranged at a position which is not influenced or is less influenced by the explosion of the converter transformer and is communicated with the compressed air foam generating device.
The compressed air foam generating device is adopted to provide compressed air foam, and the compressed air foam is conveyed to each set of compressed air foam spraying pipe system through a compressed air foam main pipe, the compressed air foam generating device is arranged far away from an explosion area of the converter transformer, and the foam main pipe is arranged at a position (arranged underground or behind a firewall or arranged inside a protection facility and closely attached to the firewall) which is not influenced or slightly influenced by the explosion of the transformer.
And fourthly, opening the corresponding partition valve, and spraying compressed air foam conveyed by the foam main pipe through six rows of release holes on the surface of the spray pipe of the compressed air foam spraying system.
And fifthly, penetrating compressed air foam sprayed by a compressed air foam spraying system which is arranged right above the valve side sleeve and the lifting seat in the valve hall and is horizontally attached to the firewall in the valve hall into each converter transformer, and fully covering the valve side sleeve, the lifting seat and the oil collecting pit which are penetrated in the valve hall.
The compressed air foam spraying system can fully cover the part of the lifting seat and the valve side sleeve penetrating into the valve hall and the oil collecting pit, and partially cover the adjacent oil collecting pits at two sides, and the supply strength of the compressed air foam is 13L/(min m.m)2）。
And sixthly, forming compressed air foam covering layers in the lifting seat, the valve side sleeve and the oil collecting pit areas of the converter transformer, and simultaneously forming compressed air foam covering layers in adjacent local areas of the oil collecting pits on the two sides, so as to finally extinguish the open fire.
When the ascending seat and the valve side sleeve of the converter transformer 9 explode or burst and fire, the leaked transformer oil freely flows into the oil collecting pit, the compressed air foam generating device is automatically or manually started at the same time, the corresponding partition valve is opened, the compressed air foam is sprayed to the ascending seat, the valve side sleeve and the oil collecting pit which are on fire, a high-stability foam covering layer is formed in the whole protection area 13 while the open fire is extinguished, in addition, a layer of foam is sprayed to the adjacent areas 14 of the oil collecting pits at two sides, and the open fire splashed to the adjacent converter transformer areas is timely extinguished.
Claims (7)
1. The fire protection system for the valve side sleeve of the ultra-high voltage converter transformer is characterized by comprising an oil collection pit (1), a compressed air foam generating device (4), a foam main pipe (5), a partition valve (6) and a compressed air foam spraying system (7), wherein the oil collection pit (1) is arranged right below a valve side sleeve (11) and a lifting seat (10) of the converter transformer penetrating into a valve hall, a support net rack (2) is fixed in the middle of the oil collection pit (1), and a pebble layer (3) is laid on the support net rack (2) and used for collecting inflow converter transformer oil; compressed air foam spraying system (7) passes through partition valve (6) and foam main pipe (5) direct intercommunication, and compressed air foam spraying system (7) arrange and penetrate valve side sleeve pipe (11) and rise seat (10) in the valve room at converter transformer directly over, and hug closely valve room and prevent hot wall (12), compressed air foam generating device (4) pass through foam main pipe (5), partition valve (6) and compressed air foam spraying system (7) intercommunication.
2. The system for protecting the valve-side sleeve fire of the ultra-high voltage converter transformer according to claim 1, wherein the compressed air foam spraying system (7) comprises spraying pipes (7-1), foam conveying pipes (7-2) and connecting pieces (7-3), one end of each spraying pipe (7-1) is closed, the other end of each spraying pipe is open and is a compressed air foam inlet, a plurality of rows of release holes (7-4) are uniformly distributed on the surface of each spraying pipe, and the foam conveying pipes (7-2) are communicated with the two spraying pipes (7-1) through the connecting pieces (7-3).
3. The system for protecting the valve-side sleeve of the extra-high voltage converter transformer from the fire according to claim 1 or claim 2, wherein the height of the paved pebble layer (3) is not less than 250mm, and the diameter of a single pebble is not less than 38 mm.
4. The system for protecting the valve side sleeve of the extra-high voltage converter transformer from the fire according to claim 1, wherein the compressed air foam spraying system (7) is made of a high-temperature-resistant metal material.
5. The system for protecting the valve-side bushing of the extra-high voltage converter transformer from the fire according to claim 1, wherein the partition valve (6) is any one of an electric valve, a pneumatic valve and a hydraulic valve.
6. Use method of the extra-high voltage converter transformer valve side bushing fire protection system according to any one of claims 1 to 5, characterized by comprising the following steps:
when a converter transformer valve side sleeve pipe is in an explosion fire, converter transformer oil flows into an oil collection pit through a pebble layer which is laid on a support net rack in the middle of the oil collection pit in advance by a system; the oil collecting pit is arranged right below the valve side sleeve penetrating into the valve hall and the lifting seat and is used for collecting the inflowing converter transformer oil and preventing fire from spreading;
a compressed air foam generating device which is automatically started or manually started in a linkage manner with the fire alarm and is arranged in an explosion area far away from the converter transformer;
thirdly, the foam main pipe is arranged at a position which is not influenced or slightly influenced by the explosion of the converter transformer and is communicated with the compressed air foam generating device to start to convey the compressed air foam;
fourthly, opening the corresponding partition valve, and spraying compressed air foam conveyed by the foam main pipe through a plurality of rows of release holes on the surface of a spray pipe of a compressed air foam spraying system;
fifthly, fully covering the valve side sleeve, the lifting seat and the oil collecting pit penetrating into the valve hall by compressed air foam sprayed by a compressed air foam spraying system which is arranged right above the valve side sleeve and the lifting seat penetrating into the valve hall and is horizontally and closely attached to a firewall of the valve hall in each converter transformer;
and sixthly, forming a compressed air foam covering layer at the lifting seat, the valve side sleeve and the oil collection pit of the converter transformer, and finally extinguishing the open fire.
7. The use method of the fire protection system for the valve-side sleeve of the extra-high voltage converter transformer according to claim 6, wherein the compressed air foam spraying system sets the compressed air foam supply strength to be 1.5-16L/(min-m)2）。
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| CN202010221612.9A CN111346323B (en) | 2020-03-26 | 2020-03-26 | Fire protection system for valve side sleeve of extra-high voltage converter transformer and use method |
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| CN202010221612.9A CN111346323B (en) | 2020-03-26 | 2020-03-26 | Fire protection system for valve side sleeve of extra-high voltage converter transformer and use method |
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| CN111346323B CN111346323B (en) | 2021-08-13 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114887259A (en) * | 2022-05-13 | 2022-08-12 | 国网安徽省电力有限公司电力科学研究院 | Extra-high voltage converter station valve hall plugging position and sleeve fire extinguishing and cooling system and using method |
| CN115040808A (en) * | 2022-06-13 | 2022-09-13 | 国网新疆电力有限公司超高压分公司 | Immersed fire extinguishing device for high-voltage bushing of ultra-high voltage transformer |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114887259A (en) * | 2022-05-13 | 2022-08-12 | 国网安徽省电力有限公司电力科学研究院 | Extra-high voltage converter station valve hall plugging position and sleeve fire extinguishing and cooling system and using method |
| CN115040808A (en) * | 2022-06-13 | 2022-09-13 | 国网新疆电力有限公司超高压分公司 | Immersed fire extinguishing device for high-voltage bushing of ultra-high voltage transformer |
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| CN111346323B (en) | 2021-08-13 |
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