CN113915519A - Zero-emission anti-deformation ring main unit insulating gas recovery device and method - Google Patents
Zero-emission anti-deformation ring main unit insulating gas recovery device and method Download PDFInfo
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- CN113915519A CN113915519A CN202111216568.3A CN202111216568A CN113915519A CN 113915519 A CN113915519 A CN 113915519A CN 202111216568 A CN202111216568 A CN 202111216568A CN 113915519 A CN113915519 A CN 113915519A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
- B01D53/0407—Constructional details of adsorbing systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/02—Special adaptations of indicating, measuring, or monitoring equipment
- F17C13/025—Special adaptations of indicating, measuring, or monitoring equipment having the pressure as the parameter
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C13/00—Details of vessels or of the filling or discharging of vessels
- F17C13/04—Arrangement or mounting of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
- F17D1/065—Arrangements for producing propulsion of gases or vapours
- F17D1/07—Arrangements for producing propulsion of gases or vapours by compression
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0337—Heat exchange with the fluid by cooling
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
- F17C2227/03—Heat exchange with the fluid
- F17C2227/0367—Localisation of heat exchange
- F17C2227/0388—Localisation of heat exchange separate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2260/00—Purposes of gas storage and gas handling
- F17C2260/04—Reducing risks and environmental impact
- F17C2260/044—Avoiding pollution or contamination
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Abstract
The utility model provides a zero release, prevent deformation looped netowrk cabinet insulating gas recovery unit and method, belongs to looped netowrk cabinet insulating gas and retrieves technical field, guarantees the indeformable problem of box when solving how to retrieve the insulating gas in the looped netowrk cabinet box completely, adopts the recovery pipeline to compress the liquefaction with initial insulating gas in the looped netowrk cabinet earlier and retrieves, reuses and mixes the replacement pipeline: firstly, filling nitrogen into the ring main unit to mix the residual insulating gas, then adsorbing the mixed gas, then desorbing and recovering the residual insulating gas, and finally detecting the recovery result; the method has the advantages that the insulating gas in the small-capacity gas chamber of the ring main unit is thoroughly recovered, the recovery rate is high, the zero emission of the insulating gas can be realized, and the environmental pollution is avoided; meanwhile, a certain amount of mixed gas exists in the gas chamber all the time, and the pressure of the gas chamber is guaranteed, so that the gas chamber is guaranteed against deformation caused by extraction of insulating gas, the gas chamber can be recycled, and resources are saved.
Description
Technical Field
The invention belongs to the technical field of recovery of insulating gas of a ring main unit, and relates to a zero-emission anti-deformation device and method for recovering insulating gas of a ring main unit.
Background
The ring network switch cabinet is convenient to operate, simple to control and protect, low in cost, widely applied to a secondary power distribution system and popular with power supply departments and end users. Sulfur hexafluoride (SF)6) Because of excellent insulating and arc-extinguishing performance of gas, most of the existing ring main units adopt sulfur hexafluoride (SF)6) Gas as insulation and cut-offA medium. SF6The gas insulation ring main unit is a miniaturized, modularized, fully sealed and fully insulated ring main switch device, all electrified parts and switches of the gas insulation ring main unit are sealed in a stainless steel gas chamber, the whole switch device is not affected by the external environment, and the operation is safe and reliable. When in-situ maintenance, due to SF in the ring main unit6The gas quantity is small, the field recovery is difficult, and the operation and maintenance personnel often directly lead the SF6The gas is discharged to the atmosphere, but SF6Is a strong greenhouse gas, and can cause environmental pollution; with the proposed national dual carbon target, for SF6The more strict the control of emission reduction of greenhouse gases, the requirement of SF6The gas recovery rate reaches 96.5 percent, and the gas chamber has small capacity but large volume and is used for the SF in the ring main unit6The gas must also be recovered.
In the prior art, a Chinese utility model patent with publication number CN208535559U and publication date of 2019, 2 and 22 months6Gas recovery compressor unit ", discloses: including the gas recovery house steward, manual two three-way valves, the booster compressor, the high-pressure steel bottle, the low pressure air pocket, the gas outlet of high-pressure gas inlet joint is connected to the first air inlet of manual two three-way valves through the gas recovery house steward, the third interface of two three-way valves is connected to the high-pressure steel bottle through the first branch union coupling of gas recovery, be equipped with the booster compressor on the first branch pipe of gas recovery in proper order, the check valve, quick change coupler, be equipped with voltage-controlled switch on the first branch pipe of gas recovery, the second interface of two three-way valves is connected to the air inlet of low pressure air pocket through the second branch pipe of gas recovery, the pressure release pipe both ends are connected to on the first branch pipe of gas recovery between gas recovery second branch pipe and check valve and the quick change coupler respectively, be equipped with the needle valve on the pressure release pipe. Realize SF6Zero emission in the waste gas recovery process avoids environmental pollution and protects the personal safety of field workers.
However, the technical scheme of the utility model can't be applied to the ring main unit, this is because the stainless steel air chamber in the ring main unit box is thinner, to the inside SF of stainless steel air chamber casing6When the gas is pumped and taken back, the gas chamber is easy to deform, thus leading to the scrapping of the gas chamber,can not be reused, and causes resource waste. Therefore, it is urgently needed to develop a recovery device for zero-emission and deformation-prevention insulating gas for a ring main unit.
Disclosure of Invention
The invention aims to solve the technical problem of how to design a device and a method for recovering insulating gas of a zero-emission anti-deformation ring main unit, so that the insulating gas in a ring main unit box body is completely recovered, and the box body is ensured not to deform.
The invention solves the technical problems through the following technical scheme:
the utility model provides a zero release, prevent insulating gaseous recovery unit of deformation looped netowrk cabinet, includes: a recovery pipeline and a mixing replacement pipeline; the recovery pipeline is used for compressing, liquefying and recovering the initial insulating gas in the ring main unit and compressing, liquefying and recovering the mixed and separated insulating gas; the mixed replacement pipeline is used for mixing, replacing and recycling the residual insulating gas in the ring main unit, and the process is as follows: firstly, filling nitrogen into the ring main unit to mix the residual insulating gas, then adsorbing the mixed gas, then desorbing and recovering the residual insulating gas, and finally detecting the recovery result;
the recovery pipeline includes: the device comprises a first pressure gauge (P1), a sampling analyzer (2), a first electromagnetic valve (V1), a second electromagnetic valve (V2), a compressor (3), a one-way valve (4), an air cooling device (5), a third electromagnetic valve (V3) and a storage tank (6); the first electromagnetic valve (V1), the second electromagnetic valve (V2), the compressor (3), the one-way valve (4), the air cooling device (5), the third electromagnetic valve (V3) and the storage tank (6) are sequentially connected end to end through sealed pipelines; the air inlet end of the first electromagnetic valve (V1) is connected with the ring main unit through a sealed pipeline, and the first pressure gauge (P1) and the sampling analyzer (2) are hermetically arranged on the pipeline between the first electromagnetic valve (V1) and the ring main unit;
the mixed replacement pipeline comprises: the device comprises an insulating gas adsorption and desorption device, an electric proportional regulating valve (V8), a pure nitrogen bottle (9) and a pressure reducing and stabilizing valve (10); the input end of the insulating gas adsorption and desorption device is hermetically connected between the third electromagnetic valve (V3) and the air cooling device (5), the output end of the insulating gas adsorption and desorption device is hermetically connected with one end of the electric proportional control valve (V8), and the other end of the electric proportional control valve (V8) is hermetically communicated between the first electromagnetic valve (V1) and the second electromagnetic valve (V2); one end of the pressure reducing and stabilizing valve (10) is hermetically connected with the pure nitrogen cylinder (9), and the other end of the pressure reducing and stabilizing valve (10) is hermetically communicated between the first electromagnetic valve (V1) and the second electromagnetic valve (V2).
The device adopts a recovery pipeline to compress, liquefy and recover the initial insulating gas in the ring main unit, and then uses a mixed replacement pipeline: firstly, filling nitrogen into the ring main unit to mix the residual insulating gas, then adsorbing the mixed gas, then desorbing and recovering the residual insulating gas, and finally detecting the recovery result; the method has the advantages that the insulating gas in the small-capacity gas chamber of the ring main unit is thoroughly recovered, the recovery rate is high, the zero emission of the insulating gas can be realized, and the environmental pollution is avoided; meanwhile, a certain amount of mixed gas exists in the gas chamber all the time, and the pressure of the gas chamber is guaranteed, so that the gas chamber is guaranteed against deformation caused by extraction of insulating gas, the gas chamber can be recycled, and resources are saved.
As a further improvement of the technical solution of the present invention, the insulating gas adsorption and desorption apparatus includes: a fourth electromagnetic valve (V4), a second pressure gauge (P2), a No. 1 molecular sieve adsorption tower (7) and a sixth electromagnetic valve (V6); one end of the fourth electromagnetic valve (V4) is connected between the third electromagnetic valve (V3) and the air cooling device (5) in a sealing mode, the other end of the fourth electromagnetic valve (V4) is connected to the input end of the No. 1 molecular sieve adsorption tower (7) in a sealing mode, one end of the sixth electromagnetic valve (V6) is connected to the output end of the No. 1 molecular sieve adsorption tower (7) in a sealing mode, and the other end of the sixth electromagnetic valve (V6) is connected with one end of the electric proportional control valve (V8) in a sealing mode; and the second pressure gauge (P2) is hermetically connected to the upper part of the 1# molecular sieve adsorption tower (7).
As a further improvement of the technical scheme of the invention, the mixed replacement pipeline further comprises a standby insulating gas adsorption and desorption device which is connected in parallel with the insulating gas adsorption and desorption device for use, the input end of the standby insulating gas adsorption and desorption device is hermetically connected between the third electromagnetic valve (V3) and the air cooling device (5), and the output end of the standby insulating gas adsorption and desorption device is hermetically connected with one end of the electric proportional control valve (V8).
As a further improvement of the technical solution of the present invention, the spare insulating gas adsorption and desorption apparatus includes: a fifth electromagnetic valve (V5), a third pressure gauge (P3), a No. 2 molecular sieve adsorption tower (8) and a seventh electromagnetic valve (V7); one end of the fifth electromagnetic valve (V5) is hermetically connected between the third electromagnetic valve (V3) and the air cooling device (5), the other end of the fifth electromagnetic valve (V5) is hermetically connected at the input end of the No. 2 molecular sieve adsorption tower (8), one end of the seventh electromagnetic valve (V7) is hermetically connected at the output end of the No. 2 molecular sieve adsorption tower (8), and the other end of the seventh electromagnetic valve (V7) is hermetically connected with one end of the electric proportional control valve (V8); and a third pressure gauge (P3) is hermetically connected to the upper part of the No. 2 molecular sieve adsorption tower (8).
As a further improvement of the technical scheme of the invention, the process of compressing, liquefying and recovering the initial insulating gas in the ring network cabinet comprises the following steps: open first solenoid valve (V1), second solenoid valve (V2), third solenoid valve (V3), compressor (3) are extracted insulating gas from the looped netowrk cabinet, insulating gas passes through check valve (4), air cooling device (5) are liquefied, rethread third solenoid valve (V3) are compressed to storage jar (6), continuously extract the insulating gas in the looped netowrk cabinet air chamber, when the registration of first manometer (P1) is the settlement numerical value, stop to bleed and the closing means.
As a further improvement of the technical scheme of the present invention, the process of charging nitrogen gas into the ring main unit to mix the residual insulating gas comprises: and (3) opening the pressure reducing and stabilizing valve (10) and the first electromagnetic valve (V1), filling the nitrogen in the pure nitrogen cylinder (9) into the ring main unit, and closing the pressure reducing and stabilizing valve (10) and the first electromagnetic valve (V1) to stop filling the nitrogen when the indication of the first pressure gauge (P1) is the rated pressure of the ring main unit.
As a further improvement of the technical scheme of the invention, the process of adsorbing the mixed gas comprises the following steps: open first solenoid valve (V1), second solenoid valve (V2), insulating gas adsorbs desorption apparatus, compressor (3), air cooling device (5), the mist among the compressor (3) extraction looped netowrk cabinet, and the mist passes through check valve (4), air cooling device (5) flow direction insulating gas adsorbs desorption apparatus, and the insulating gas in the mist is adsorbed by insulating gas adsorption desorption apparatus, nitrogen gas in the mist discharges to the atmosphere.
As a further improvement of the technical scheme of the present invention, the process of desorbing and recovering the residual insulating gas comprises: close insulating gas adsorption and desorption device's input, open electronic proportion regulating valve (V8), second solenoid valve (V2), compressor (3), air cooling device (5) continue work, adsorb desorption device to insulating gas and bleed, insulating gas adsorbs the inside negative pressure that forms of desorption device, the insulating gas that the insulating gas adsorbs the absorption in the desorption device is desorbed, through check valve (4), air cooling device (5) are liquefied, rethread third solenoid valve (V3) are compressed to in storage jar (6).
As a further improvement of the technical scheme of the invention, the process of detecting the recovery result comprises the following steps: and closing the first electromagnetic valve (V1), starting the sampling analyzer (2) to sample and analyze the gas in the ring main unit, and stopping the recovery work when the content of the insulating gas is detected to be 0.
The method applied to the ring main unit insulating gas recovery device comprises the following steps:
s1, primarily recycling the insulating gas in the ring main unit; the method specifically comprises the following steps: opening a first electromagnetic valve (V1), a second electromagnetic valve (V2), a third electromagnetic valve (V3) and a compressor (3), extracting insulating gas from the ring main unit by the compressor (3), liquefying the insulating gas through a one-way valve (4) and an air cooling device (5), compressing the insulating gas into a storage tank (6) through the third electromagnetic valve (V3), continuously extracting the insulating gas in an air chamber of the ring main unit, and stopping air extraction and closing the device until the indication value of a first pressure gauge (P1) is a set value;
s2, filling nitrogen into the ring main unit to mix the residual insulating gas; the method specifically comprises the following steps: opening a pressure reducing and stabilizing valve (10) and a first electromagnetic valve (V1), filling nitrogen in a pure nitrogen cylinder (9) into the ring main unit, and closing the pressure reducing and stabilizing valve (10) and the first electromagnetic valve (V1) to stop filling the nitrogen when the indication number of a first pressure gauge (P1) is the rated pressure of the ring main unit;
s3, adsorbing the mixed gas; the method specifically comprises the following steps: opening a first electromagnetic valve (V1), a second electromagnetic valve (V2), an insulating gas adsorption and desorption device, a compressor (3) and an air cooling device (5), wherein the compressor (3) extracts mixed gas in the ring main unit, the mixed gas flows to the insulating gas adsorption and desorption device through a one-way valve (4) and the air cooling device (5), the insulating gas in the mixed gas is adsorbed by the insulating gas adsorption and desorption device, and nitrogen in the mixed gas is discharged to the atmosphere;
s4, desorbing and recovering the residual insulating gas; the method specifically comprises the following steps: the input end of the insulating gas adsorption and desorption device is closed, the electric proportional control valve (V8) and the second electromagnetic valve (V2) are opened, the compressor (3) and the air cooling device (5) continue to work, the insulating gas adsorption and desorption device is pumped, negative pressure is formed inside the insulating gas adsorption and desorption device, the insulating gas adsorbed in the insulating gas adsorption and desorption device is desorbed, liquefied through the one-way valve (4) and the air cooling device (5), and then compressed into the storage tank (6) through the third electromagnetic valve (V3);
s5, detecting the recovery result; the method specifically comprises the following steps: and closing the first electromagnetic valve (V1), starting the sampling analyzer (2) to sample and analyze the gas in the ring main unit, and stopping the recovery work when the content of the insulating gas is detected to be 0.
The invention has the advantages that:
the device and the method of the invention adopt the recovery pipeline to compress, liquefy and recover the initial insulating gas in the ring main unit, and then use the mixed replacement pipeline: firstly, filling nitrogen into the ring main unit to mix the residual insulating gas, then adsorbing the mixed gas, then desorbing and recovering the residual insulating gas, and finally detecting the recovery result; the method has the advantages that the insulating gas in the small-capacity gas chamber of the ring main unit is thoroughly recovered, the recovery rate is high, the zero emission of the insulating gas can be realized, and the environmental pollution is avoided; meanwhile, a certain amount of mixed gas exists in the gas chamber all the time, and the pressure of the gas chamber is guaranteed, so that the gas chamber is guaranteed against deformation caused by extraction of insulating gas, the gas chamber can be recycled, and resources are saved.
Drawings
Fig. 1 is a structural diagram of a zero-emission anti-deformation ring main unit insulating gas recovery device according to a first embodiment of the present invention;
fig. 2 is a flowchart of a method for recovering insulating gas from a zero-emission and deformation-prevention ring main unit according to a second embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The technical scheme of the invention is further described by combining the drawings and the specific embodiments in the specification:
example one
As shown in fig. 1, a zero release, prevent that deformation looped netowrk cabinet insulating gas recovery unit includes: the device comprises an air inlet 1, a sampling analyzer 2, a compressor 3, a one-way valve 4, an air cooling device 5, a storage tank 6, a 1# molecular sieve adsorption tower 7, a 2# molecular sieve adsorption tower 8, a pure nitrogen bottle 9 and a pressure reducing and stabilizing valve 10; a first pressure gauge P1, a second pressure gauge P2 and a third pressure gauge P3; a first solenoid valve V1, a second solenoid valve V2, a third solenoid valve V3, a fourth solenoid valve V4, a fifth solenoid valve V5, a sixth solenoid valve V6, a seventh solenoid valve V7, and an electric proportional control valve V8.
The first electromagnetic valve V1, the second electromagnetic valve V2, the compressor 3, the one-way valve 4, the air cooling device 5, the third electromagnetic valve V3 and the storage tank 6 are sequentially connected end to end through sealed pipelines; the air inlet end of the first electromagnetic valve V1 is connected with the air inlet 1 through a sealed pipeline, and the first pressure gauge P1 and the sampling analyzer 2 are hermetically arranged on the pipeline between the first electromagnetic valve V1 and the air inlet 1.
One end of the fourth electromagnetic valve V4 is hermetically connected between the third electromagnetic valve V3 and the air cooling device 5, the other end of the fourth electromagnetic valve V4 is hermetically connected to the input end of the No. 1 molecular sieve adsorption tower 7, one end of the sixth electromagnetic valve V6 is hermetically connected to the output end of the No. 1 molecular sieve adsorption tower 7, and the other end of the sixth electromagnetic valve V6 is hermetically connected with one end of the electric proportional control valve V8; one end of a fifth electromagnetic valve V5 is hermetically connected between the third electromagnetic valve V3 and the air cooling device 5, the other end of the fifth electromagnetic valve V5 is hermetically connected to the input end of the No. 2 molecular sieve adsorption tower 8, one end of a seventh electromagnetic valve V7 is hermetically connected to the output end of the No. 2 molecular sieve adsorption tower 8, and the other end of the seventh electromagnetic valve V7 is hermetically connected with one end of an electric proportional control valve V8; the other end of the electric proportional control valve V8 is in sealed communication between a first electromagnetic valve V1 and a second electromagnetic valve V2; the second pressure gauge P2 is hermetically connected with the upper part of the No. 1 molecular sieve adsorption tower 7; the third pressure gauge P3 is hermetically connected with the upper part of the No. 2 molecular sieve adsorption tower 8;
one end of the pressure reducing and stabilizing valve 10 is hermetically connected with the pure nitrogen bottle 9, and the other end is hermetically communicated between the first electromagnetic valve V1 and the second electromagnetic valve V2.
The working process of the device is as follows:
opening a first electromagnetic valve V1, a second electromagnetic valve V2, a third electromagnetic valve V3, the compressor 3 and the air cooling device 5; compressor 3 compressing SF6Gas is extracted from the gas chamber of the ring main unit, SF6The gas is liquefied through the one-way valve 4 and the air cooling device 5, and then is compressed into the storage tank 6 through the third electromagnetic valve V3, and the SF in the looped network cabinet air chamber is continuously extracted6Gas, when the reading of the first pressure gauge P1 is a set value, stopping air suction and closing the device; at the moment, a certain amount of SF is remained in the air chamber of the ring main unit6And gas is used for ensuring that the ring main unit gas chamber is not deformed. Therefore, it is necessary to further treat the residual SF6And replacing and recovering the gas.
Opening the pressure reducing and stabilizing valve 10 and the first electromagnetic valve V1, filling the nitrogen in the pure nitrogen bottle 9 into the ring main unit, closing the pressure reducing and stabilizing valve 10 and the first electromagnetic valve V1 when the indication number of the first pressure gauge P1 is the rated pressure of the ring main unit, stopping filling the nitrogen, and at the moment, the gas in the gas chamber is low-concentration SF6And N2The mixed gas of (1).
Opening the first electromagnetic valve V1, the second electromagnetic valve V2, the fourth electromagnetic valve V4, the compressor 3 and the air cooling device 5, wherein the compressor 3 extracts SF in the air chamber of the ring main unit6And N2The mixed gas flows through a check valve 4 and an air cooling device 5To the 1# molecular sieve adsorption tower 7, SF in the mixed gas6N in the mixed gas is adsorbed by a 1# molecular sieve adsorption tower 72The discharge is not shown to the atmosphere through a vent valve on the # 1 molecular sieve adsorption column 7.
The No. 1 molecular sieve adsorption tower 7 and the No. 2 molecular sieve adsorption tower 8 are mutually standby, and when one of the adsorption towers reaches adsorption saturation, the other adsorption tower is started. When the No. 1 molecular sieve adsorption tower 7 is saturated, the fourth electromagnetic valve V4 is closed, the fifth electromagnetic valve V5 is opened, the mixed gas flows to the No. 2 molecular sieve adsorption tower 8 through the one-way valve 4 and the air cooling device 5, and SF in the mixed gas6Is adsorbed by a No. 2 molecular sieve adsorption tower 8.
At this time, the fourth electromagnetic valve V4 and the exhaust valve on the 1# molecular sieve adsorption tower 7 are closed, the electric proportional control valve V8, the sixth electromagnetic valve V6 and the second electromagnetic valve V2 are opened, the compressor 3 and the air cooling device 5 continue to work to extract air to the 1# molecular sieve adsorption tower 7, negative pressure is formed inside the 1# molecular sieve adsorption tower 7, and when the reading of the second pressure gauge P2 reaches a set value, the SF adsorbed in the 1# molecular sieve adsorption tower 7 is detected6The gas is desorbed, liquefied by the check valve 4 and the air-cooling device 5, and compressed by the third electromagnetic valve V3 into the storage tank 6.
The desorption process of the # 2 molecular sieve adsorption tower 8 is similar to that of the # 1 molecular sieve adsorption tower 7, and the detailed description is omitted here.
After multiple cycles, the first electromagnetic valve V1 is closed, the sampling analyzer 2 is started to sample and analyze the gas in the ring main unit, and SF is detected6When the gas content is 0, the recovery operation is stopped.
Example two
As shown in fig. 2, a method for recovering insulating gas of a zero-emission anti-deformation ring main unit includes the following steps:
1. initial SF in the ring main unit6The gas is compressed, liquefied and recovered
Opening a first electromagnetic valve V1, a second electromagnetic valve V2, a third electromagnetic valve V3, the compressor 3 and the air cooling device 5; compressor 3 compressing SF6Gas is extracted from the gas chamber of the ring main unit, SF6The gas is liquefied by the check valve 4 and the air-cooling device 5, and then pressurized by the third electromagnetic valve V3Retracting to the storage tank 6 to continuously extract SF in the ring main unit6Gas, when the reading of the first pressure gauge P1 is a set value, stopping air suction and closing the device; at the moment, a certain amount of SF is remained in the ring main unit6And gas is used for ensuring that the ring main unit is not deformed. Therefore, it is necessary to further treat the residual SF6And replacing and recovering the gas.
2. Charging nitrogen gas into the ring main unit to residual SF6Mixing the gases
Opening the pressure reducing and stabilizing valve 10 and the first electromagnetic valve V1, filling nitrogen in the pure nitrogen bottle 9 into the ring main unit, closing the pressure reducing and stabilizing valve 10 and the first electromagnetic valve V1 when the indication number of the first pressure gauge P1 is the rated pressure of the ring main unit, stopping filling the nitrogen, and at the moment, the gas in the gas chamber of the ring main unit is low-concentration SF6And N2The mixed gas of (1).
3. Adsorbing the mixed gas
Opening the first electromagnetic valve V1, the second electromagnetic valve V2, the fourth electromagnetic valve V4, the compressor 3 and the air cooling device 5, wherein the compressor 3 extracts SF in the ring main unit6And N2The mixed gas flows to a No. 1 molecular sieve adsorption tower 7 through a one-way valve 4 and an air cooling device 5, and SF in the mixed gas6N in the mixed gas is adsorbed by a 1# molecular sieve adsorption tower 72The discharge is not shown to the atmosphere through a vent valve on the # 1 molecular sieve adsorption column 7.
The No. 1 molecular sieve adsorption tower 7 and the No. 2 molecular sieve adsorption tower 8 are mutually standby, and when one of the adsorption towers reaches adsorption saturation, the other adsorption tower is started. When the No. 1 molecular sieve adsorption tower 7 is saturated, the fourth electromagnetic valve V4 is closed, the fifth electromagnetic valve V5 is opened, the mixed gas flows to the No. 2 molecular sieve adsorption tower 8 through the one-way valve 4 and the air cooling device 5, and SF in the mixed gas6Is adsorbed by a No. 2 molecular sieve adsorption tower 8.
4. For residual SF6Gas is desorbed and recovered
At this time, the fourth electromagnetic valve V4 and the exhaust valve on the 1# molecular sieve adsorption tower 7 are closed, the electric proportional control valve V8, the sixth electromagnetic valve V6 and the second electromagnetic valve V2 are opened, the compressor 3 and the air cooling device 5 continue to work, and the 1# molecular sieve adsorption tower 7 is subjected to the operationPerforming air extraction, forming negative pressure inside the 1# molecular sieve adsorption tower 7, and when the reading of the second pressure gauge P2 reaches a set value, adsorbing SF in the 1# molecular sieve adsorption tower 76The gas is desorbed, liquefied by the check valve 4 and the air-cooling device 5, and compressed by the third electromagnetic valve V3 into the storage tank 6.
The desorption process of the # 2 molecular sieve adsorption tower 8 is similar to that of the # 1 molecular sieve adsorption tower 7, and the detailed description is omitted here.
5. Detecting the recovery result
After the step 2-4 is circulated for multiple times, the first electromagnetic valve V1 is closed, the sampling analyzer 2 is started to sample and analyze the gas in the ring main unit, and SF is detected6When the gas content is 0, the recovery operation is stopped.
SF in ring main unit6Calculating the relationship between the gas residual concentration and the cycle number:
(1) under the initial condition, the rated pressure of the air chamber of the ring main unit is P0SF in the gas chamber6Concentration of gas
Wherein R represents a thermodynamic constant, T represents the temperature of the air chamber of the ring main unit, and N is arranged in the air chamber2Concentration of gas
Is 0.
(2) The 1 st air extraction is completed, and the pressure of the air chamber reaches P1SF in the gas chamber of the ring main unit6Concentration of gas
N in ring main unit air chamber2Concentration of gas
Is 0;
(3) the 1 st inflation is completed, and the pressure of the air chamber returns to P0SF in the gas chamber of the ring main unit6Concentration of gas
Ring networkIn cabinet air chamber N2Concentration of gas
(4) The 2 nd air extraction is completed, and the pressure of the air chamber reaches P1SF in the gas chamber of the ring main unit6Concentration of gas
N in ring main unit air chamber2Concentration of gas
(5) The 2 nd inflation is completed, and the pressure of the air chamber returns to P0SF in the gas chamber of the ring main unit6Concentration of gas
N in ring main unit air chamber2Concentration of gas
(6) After the kth air extraction is finished, the pressure of the air chamber reaches P1SF in the gas chamber of the ring main unit6Concentration of gas
N in ring main unit air chamber2Concentration of gas
(7) After the kth air extraction is finished, the pressure of the air chamber reaches P0SF in the gas chamber of the ring main unit6Concentration of gas
N in ring main unit air chamber2Concentration of gas
(8) According to given recovered ring networkAnd estimating the required pumping and inflating cycle times K by using the residual SF6 gas concentration threshold epsilon of the cabinet gas chamber. After the K-time air exhaust and inflation circulation, SF in the ring main unit air chamber is required6Gas concentration CkS,F 16 is not greater than ε, i.e
The following can be obtained:
the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The utility model provides a zero release, prevent insulating gaseous recovery unit of deformation looped netowrk cabinet which characterized in that includes: a recovery pipeline and a mixing replacement pipeline; the recovery pipeline is used for compressing, liquefying and recovering the initial insulating gas in the ring main unit and compressing, liquefying and recovering the mixed and separated insulating gas; the mixed replacement pipeline is used for mixing, replacing and recycling the residual insulating gas in the ring main unit, and the process is as follows: firstly, filling nitrogen into the ring main unit to mix the residual insulating gas, then adsorbing the mixed gas, then desorbing and recovering the residual insulating gas, and finally detecting the recovery result;
the recovery pipeline includes: the device comprises a first pressure gauge (P1), a sampling analyzer (2), a first electromagnetic valve (V1), a second electromagnetic valve (V2), a compressor (3), a one-way valve (4), an air cooling device (5), a third electromagnetic valve (V3) and a storage tank (6); the first electromagnetic valve (V1), the second electromagnetic valve (V2), the compressor (3), the one-way valve (4), the air cooling device (5), the third electromagnetic valve (V3) and the storage tank (6) are sequentially connected end to end through sealed pipelines; the air inlet end of the first electromagnetic valve (V1) is connected with the ring main unit through a sealed pipeline, and the first pressure gauge (P1) and the sampling analyzer (2) are hermetically arranged on the pipeline between the first electromagnetic valve (V1) and the ring main unit;
the mixed replacement pipeline comprises: the device comprises an insulating gas adsorption and desorption device, an electric proportional regulating valve (V8), a pure nitrogen bottle (9) and a pressure reducing and stabilizing valve (10); the input end of the insulating gas adsorption and desorption device is hermetically connected between the third electromagnetic valve (V3) and the air cooling device (5), the output end of the insulating gas adsorption and desorption device is hermetically connected with one end of the electric proportional control valve (V8), and the other end of the electric proportional control valve (V8) is hermetically communicated between the first electromagnetic valve (V1) and the second electromagnetic valve (V2); one end of the pressure reducing and stabilizing valve (10) is hermetically connected with the pure nitrogen cylinder (9), and the other end of the pressure reducing and stabilizing valve (10) is hermetically communicated between the first electromagnetic valve (V1) and the second electromagnetic valve (V2).
2. The ring main unit insulating gas recovery device according to claim 1, wherein the insulating gas adsorption and desorption device includes: a fourth electromagnetic valve (V4), a second pressure gauge (P2), a No. 1 molecular sieve adsorption tower (7) and a sixth electromagnetic valve (V6); one end of the fourth electromagnetic valve (V4) is connected between the third electromagnetic valve (V3) and the air cooling device (5) in a sealing mode, the other end of the fourth electromagnetic valve (V4) is connected to the input end of the No. 1 molecular sieve adsorption tower (7) in a sealing mode, one end of the sixth electromagnetic valve (V6) is connected to the output end of the No. 1 molecular sieve adsorption tower (7) in a sealing mode, and the other end of the sixth electromagnetic valve (V6) is connected with one end of the electric proportional control valve (V8) in a sealing mode; and the second pressure gauge (P2) is hermetically connected to the upper part of the 1# molecular sieve adsorption tower (7).
3. The ring main unit insulating gas recovery device according to claim 1, wherein the mixed replacement pipeline further includes a standby insulating gas adsorption and desorption device connected in parallel with the insulating gas adsorption and desorption device, an input end of the standby insulating gas adsorption and desorption device is hermetically connected between the third electromagnetic valve (V3) and the air cooling device (5), and an output end of the standby insulating gas adsorption and desorption device is hermetically connected with one end of the electric proportional control valve (V8).
4. The ring main unit insulating gas recovery device according to claim 3, wherein the standby insulating gas adsorption and desorption device includes: a fifth electromagnetic valve (V5), a third pressure gauge (P3), a No. 2 molecular sieve adsorption tower (8) and a seventh electromagnetic valve (V7); one end of the fifth electromagnetic valve (V5) is hermetically connected between the third electromagnetic valve (V3) and the air cooling device (5), the other end of the fifth electromagnetic valve (V5) is hermetically connected at the input end of the No. 2 molecular sieve adsorption tower (8), one end of the seventh electromagnetic valve (V7) is hermetically connected at the output end of the No. 2 molecular sieve adsorption tower (8), and the other end of the seventh electromagnetic valve (V7) is hermetically connected with one end of the electric proportional control valve (V8); and a third pressure gauge (P3) is hermetically connected to the upper part of the No. 2 molecular sieve adsorption tower (8).
5. The recycling device of insulating gas in ring main unit according to claim 1, wherein the process of compressing, liquefying and recycling the initial insulating gas in the ring main unit is as follows: open first solenoid valve (V1), second solenoid valve (V2), third solenoid valve (V3), compressor (3) are extracted insulating gas from the looped netowrk cabinet, insulating gas passes through check valve (4), air cooling device (5) are liquefied, rethread third solenoid valve (V3) are compressed to in storage jar (6), continuously extract the insulating gas in the looped netowrk cabinet, when the registration of first manometer (P1) is the settlement numerical value, stop to bleed and the closing means.
6. The ring main unit insulating gas recovery device according to claim 5, wherein the process of filling nitrogen gas into the ring main unit to mix the residual insulating gas is as follows: and (3) opening the pressure reducing and stabilizing valve (10) and the first electromagnetic valve (V1), filling the nitrogen in the pure nitrogen cylinder (9) into the ring main unit, and closing the pressure reducing and stabilizing valve (10) and the first electromagnetic valve (V1) to stop filling the nitrogen when the indication of the first pressure gauge (P1) is the rated pressure of the ring main unit.
7. The ring main unit insulating gas recovery device according to claim 6, wherein the process of adsorbing the mixed gas is as follows: open first solenoid valve (V1), second solenoid valve (V2), insulating gas adsorbs desorption apparatus, compressor (3), air cooling device (5), the mist among the compressor (3) extraction looped netowrk cabinet, and the mist passes through check valve (4), air cooling device (5) flow direction insulating gas adsorbs desorption apparatus, and the insulating gas in the mist is adsorbed by insulating gas adsorption desorption apparatus, nitrogen gas in the mist discharges to the atmosphere.
8. The ring main unit insulating gas recovery device according to claim 7, wherein the process of performing desorption and recovery on the residual insulating gas is as follows: close insulating gas adsorption and desorption device's input, open electronic proportion regulating valve (V8), second solenoid valve (V2), compressor (3), air cooling device (5) continue work, adsorb desorption device to insulating gas and bleed, insulating gas adsorbs the inside negative pressure that forms of desorption device, the insulating gas that the insulating gas adsorbs the absorption in the desorption device is desorbed, through check valve (4), air cooling device (5) are liquefied, rethread third solenoid valve (V3) are compressed to in storage jar (6).
9. The ring main unit insulating gas recovery device according to claim 8, wherein the process of detecting the recovery result is: and closing the first electromagnetic valve (V1), starting the sampling analyzer (2) to sample and analyze the gas in the ring main unit, and stopping the recovery work when the content of the insulating gas is detected to be 0.
10. A method applied to the ring main unit insulating gas recovery device according to any one of claims 1 to 9, characterized by comprising the following steps:
s1, primarily recycling the insulating gas in the ring main unit; the method specifically comprises the following steps: opening a first electromagnetic valve (V1), a second electromagnetic valve (V2), a third electromagnetic valve (V3) and a compressor (3), extracting insulating gas from the ring main unit by the compressor (3), liquefying the insulating gas through a one-way valve (4) and an air cooling device (5), compressing the insulating gas into a storage tank (6) through the third electromagnetic valve (V3), continuously extracting the insulating gas in the ring main unit, and stopping air extraction and closing the device until the indication value of a first pressure gauge (P1) is a set value;
s2, filling nitrogen into the ring main unit to mix the residual insulating gas; the method specifically comprises the following steps: opening a pressure reducing and stabilizing valve (10) and a first electromagnetic valve (V1), filling nitrogen in a pure nitrogen cylinder (9) into the ring main unit, and closing the pressure reducing and stabilizing valve (10) and the first electromagnetic valve (V1) to stop filling the nitrogen when the indication number of a first pressure gauge (P1) is the rated pressure of the ring main unit;
s3, adsorbing the mixed gas; the method specifically comprises the following steps: opening a first electromagnetic valve (V1), a second electromagnetic valve (V2), an insulating gas adsorption and desorption device, a compressor (3) and an air cooling device (5), wherein the compressor (3) extracts mixed gas in the ring main unit, the mixed gas flows to the insulating gas adsorption and desorption device through a one-way valve (4) and the air cooling device (5), the insulating gas in the mixed gas is adsorbed by the insulating gas adsorption and desorption device, and nitrogen in the mixed gas is discharged to the atmosphere;
s4, desorbing and recovering the residual insulating gas; the method specifically comprises the following steps: the input end of the insulating gas adsorption and desorption device is closed, the electric proportional control valve (V8) and the second electromagnetic valve (V2) are opened, the compressor (3) and the air cooling device (5) continue to work, the insulating gas adsorption and desorption device is pumped, negative pressure is formed inside the insulating gas adsorption and desorption device, the insulating gas adsorbed in the insulating gas adsorption and desorption device is desorbed, liquefied through the one-way valve (4) and the air cooling device (5), and then compressed into the storage tank (6) through the third electromagnetic valve (V3);
s5, detecting the recovery result; the method specifically comprises the following steps: and closing the first electromagnetic valve (V1), starting the sampling analyzer (2) to sample and analyze the gas in the ring main unit, and stopping the recovery work when the content of the insulating gas is detected to be 0.
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