Sulfur hexafluoride multi-channel gas-mixing pressure-regulating rapid recovery device and method

Abstract

The invention provides a multi-channel gas-mixing pressure-regulating rapid recovery device and method for sulfur hexafluoride, and belongs to the field of sulfur hexafluoride recovery. The device comprises electrical equipment of sulfur hexafluoride to be recovered, a four-way valve, a pressure transmitter, a first mass flowmeter, a nitrogen gas source, a pretreatment system, a compression system, a membrane separation system, a second mass flowmeter and a sulfur hexafluoride gas storage tank, a nitrogen source is connected with a first electromagnetic valve and a first mass flow meter, the first mass flow meter and a first one-way valve are connected with three ports of a four-way valve, a pressure transmitter is connected with two ports of the four-way valve, electrical equipment is connected with one port of the four-way valve, four ports of the four-way valve are connected with a pretreatment system, and the pretreatment system is connected with a compression system. The compression system is respectively connected with the membrane separation system and the second mass flow meter, the second mass flow meter is connected with a sulfur hexafluoride outlet of the membrane separation system, and an outlet of the second mass flow meter is connected with an inlet of the sulfur hexafluoride gas storage tank. The recovery efficiency can be improved.

Description

Technical Field

[0001] The invention relates to the technical field of sulfur hexafluoride recovery, and in particular to a sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device and method. Background Art

[0002] Sulfur hexafluoride is a colorless, odorless, non-toxic gas under normal pressure. Its chemical properties are very stable. Due to its excellent insulation and arc extinguishing capabilities, it is widely used in electrical equipment of various voltage levels. The use of sulfur hexafluoride in the power industry accounts for 80% of the total use of sulfur hexafluoride. With the transformation of the power system and the large-scale construction of high-voltage substations in recent years, the use of sulfur hexafluoride has shown an explosive growth. However, sulfur hexafluoride is one of the six greenhouse gases that are prohibited from being emitted. Its global warming potential is 23,500 times that of carbon dioxide, and it can exist stably in the air for 3,200 years. Therefore, it needs to be strictly controlled during use.

[0003] At present, various power grids or power generation companies use sulfur hexafluoride recovery devices to carry out sulfur hexafluoride recovery work in infrastructure, maintenance and decommissioning. By repurifying and reusing the recovered gas, sulfur hexafluoride emissions are reduced and the purchase cost of sulfur hexafluoride is reduced. Currently, the mainstream method is to use SF6 special compressors to recover SF6 gas in power equipment. The sulfur hexafluoride gas in the power equipment is pressurized by the compressor and sent to the storage tank to achieve the purpose of recovery.

[0004] However, when the current recovery device recovers to zero pressure inside the power equipment, the recovery rate is reduced and the time is long, which is not conducive to rapid maintenance operations. Moreover, after the recovery stops, some SF6 gas will remain in the power equipment, which can easily cause waste of resources and environmental pollution. Summary of the invention

[0005] The embodiment of the present invention provides a sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device and method to solve the problem that the current recovery device takes a long time to recover after the internal pressure is reduced.

[0006] In a first aspect, an embodiment of the present invention provides a sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device, including electrical equipment for sulfur hexafluoride to be recovered, a four-way valve, a pressure transmitter, a first mass flow meter, a nitrogen gas source, a pretreatment system, a compression system, a membrane separation system, a second mass flow meter and a sulfur hexafluoride gas storage tank;

[0007] The nitrogen gas source is connected to the first mass flowmeter through the first solenoid valve, the first mass flowmeter is connected to the three ports of the four-way valve through the first one-way valve, the pressure transmitter is connected to the two ports of the four-way valve, the electrical equipment is connected to one port of the four-way valve, the four ports of the four-way valve are connected to the pretreatment system, the pretreatment system is connected to the compression system, the compression system is respectively connected to the membrane separation system and the second mass flowmeter, the inlet of the second mass flowmeter is connected to the sulfur hexafluoride outlet of the membrane separation system, and the outlet of the second mass flowmeter is connected to the inlet of the sulfur hexafluoride gas storage tank.

[0008] In one possible implementation, the compression system includes a vacuum compressor and a compressor;

[0009] The outlet of the pretreatment system is connected to one port of the first three-way valve, the two ports of the first three-way valve are connected to the inlet of the third solenoid valve, and the outlet of the third solenoid valve is connected to the two ports of the second three-way valve; the three ports of the first three-way valve are connected to the inlet of the fourth solenoid valve, the outlet of the fourth solenoid valve is connected to the inlet of the vacuum compressor, the outlet of the vacuum compressor is connected to the inlet of the second one-way valve, the outlet of the second one-way valve is connected to one port of the second three-way valve, the three ports of the second three-way valve are connected to the inlet of the compressor, and the outlet of the compressor is respectively connected to the membrane separation system and the second mass flowmeter.

[0010] In a possible implementation, the compression system is connected to one port of the third three-way valve, the second port of the third three-way valve is connected to the inlet of the fifth solenoid valve, and the outlet of the fifth solenoid valve is connected to the inlet of the membrane separation system.

[0011] In one possible implementation, the sulfur hexafluoride outlet of the membrane separation system is connected to the inlet of the seventh solenoid valve, the outlet of the seventh solenoid valve is connected to the two ends of the fourth three-way valve, the three ports of the third three-way valve are connected to the inlet of the sixth solenoid valve, the outlet of the sixth solenoid valve is connected to one end of the fourth three-way valve, and the three ends of the fourth three-way valve are connected to the inlet of the second mass flowmeter.

[0012] In a possible implementation, the nitrogen outlet of the membrane separation system is connected to the inlet of the eighth solenoid valve.

[0013] In a possible implementation, the membrane separation system is built with a high-precision gas separation membrane for separating sulfur hexafluoride gas and nitrogen for pressure regulation, and the outlet of the membrane separation system includes a nitrogen outlet and a sulfur hexafluoride outlet.

[0014] In one possible implementation, 5A molecular sieve and 13X molecular sieve are installed in the pretreatment system to treat impurities in sulfur hexafluoride gas; the pressure transmitter is used to monitor the pressure value in the electrical equipment and transmit the value to the recovery device control system.

[0015] In a second aspect, an embodiment of the present invention provides a method for rapid recovery of sulfur hexafluoride by multi-channel mixed gas pressure regulation, based on a rapid recovery device for sulfur hexafluoride by multi-channel mixed gas pressure regulation according to any one of claims 1 to 7, comprising:

[0016] When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is positive and greater than or equal to a first preset threshold, the sulfur hexafluoride gas is controlled to enter the pretreatment system to remove impurities in the sulfur hexafluoride gas. After the sulfur hexafluoride gas enters the compressor in the compression system, the compressor pressurizes the sulfur hexafluoride gas. The pressurized sulfur hexafluoride gas is measured by the second mass flow meter into the sulfur hexafluoride gas storage tank.

[0017] In a possible implementation, the recycling method further includes:

[0018] When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is negative pressure and is greater than or equal to the second preset threshold and less than the first preset threshold, the sulfur hexafluoride gas is controlled to enter the pretreatment system to remove impurities in the sulfur hexafluoride gas. After the sulfur hexafluoride gas enters the vacuum compressor in the compression system, the vacuum compressor pressurizes the sulfur hexafluoride gas, and the pressurized sulfur hexafluoride gas is measured into the sulfur hexafluoride gas storage tank through the second mass flow meter; wherein the first preset threshold is greater than the second preset threshold.

[0019] In a possible implementation, the recycling method further includes:

[0020] When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is a vacuum and the pressure is less than a second preset threshold, controlling nitrogen to flow from a nitrogen gas source through a first mass flow meter and a four-way valve into the electrical equipment;

[0021] When it is monitored that the pressure of the mixed gas in the electrical equipment is equal to the first preset threshold value, the mixed gas is controlled to enter the pretreatment system to remove impurities in the mixed gas. After the mixed gas enters the vacuum compressor in the compression system, the vacuum compressor pressurizes the mixed gas. The pressurized mixed gas is pressurized by the compressor. The pressurized mixed gas is separated into nitrogen and sulfur hexafluoride by the membrane separation system. The sulfur hexafluoride is controlled to be measured into the sulfur hexafluoride gas storage tank through the second mass flow meter, and the nitrogen is controlled to be discharged into the air.

[0022] The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device provided by the embodiment of the present invention, by setting a nitrogen gas source, when the pressure in the electrical equipment to be recovered sulfur hexafluoride is low, the nitrogen in the nitrogen gas source can be controlled to enter the electrical equipment through the first mass flow meter through the four-way valve, so that the pressure of the mixed gas in the electrical equipment is increased. By setting a compression system, the mixed gas can be further pressurized, which is further conducive to the mixed gas quickly and completely entering the membrane separation system, and realizing the rapid separation of sulfur hexafluoride gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device provided in an embodiment of the present invention;

[0025] Figure 2 Another sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device provided in an embodiment of the present invention;

[0026] Figure 3 is a schematic structural diagram of a membrane separation system provided by an embodiment of the present invention;

[0027] Figure 4 This is the third sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device provided by the embodiment of the present invention. DETAILED DESCRIPTION

[0028] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present invention. However, it should be clear to those skilled in the art that the present invention may be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present invention.

[0029] In order to make the purpose, technical solutions and advantages of the present invention more clear, specific embodiments will be described below in conjunction with the accompanying drawings.

[0030] As introduced in the background technology, currently, the mainstream method is to use a dedicated SF6 compressor to recycle SF6 gas in power equipment. The sulfur hexafluoride gas in the power equipment is pressurized by the compressor and sent to the storage tank to achieve the purpose of recycling. However, when this method recycles to zero pressure inside the power equipment, the recovery rate is reduced, the time is long, and it is not conducive to rapid maintenance operations. Moreover, after the recovery stops, a part of SF6 gas remains in the power equipment, causing problems of waste of resources and environmental pollution.

[0031] Figure 1 The structural schematic diagram of the sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device provided in the embodiment of the present invention is described in detail as follows:

[0032] A sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device includes an electrical device 100 for recovering sulfur hexafluoride, a four-way valve 202, a pressure transmitter 201, a first mass flow meter 203, a nitrogen gas source 204, a pretreatment system 205, a compression system 206, a membrane separation system 207, a second mass flow meter 208 and a sulfur hexafluoride gas storage tank 209.

[0033] In this embodiment, the nitrogen source 204 is connected to the first mass flowmeter 203 through the first solenoid valve, the first mass flowmeter 203 is connected to the three ports of the four-way valve through the first one-way valve, the pressure transmitter 201 is connected to the two ports of the four-way valve 202, the electrical equipment 100 is connected to one port of the four-way valve 202, the four ports of the four-way valve 202 are connected to the pretreatment system 205, the pretreatment system 205 is connected to the compression system 206, the compression system 206 is respectively connected to the membrane separation system 207 and the second mass flowmeter 208, the inlet of the second mass flowmeter 208 is connected to the sulfur hexafluoride outlet of the membrane separation system 207, and the outlet of the second mass flowmeter 208 is connected to the inlet of the sulfur hexafluoride gas storage tank 209.

[0034] In some embodiments, in order to improve the recovery efficiency and reduce the residual sulfur hexafluoride gas when the internal recovery pressure of the power equipment reaches zero, as shown in FIG. Figure 2 As shown, the compression system includes a vacuum compressor 2062 and a compressor 2061. The outlet of the pretreatment system 205 is connected to one port of the first three-way valve, the two ports of the first three-way valve are connected to the inlet of the third solenoid valve, and the outlet of the third solenoid valve is connected to the two ports of the second three-way valve; the three ports of the first three-way valve are connected to the inlet of the fourth solenoid valve, the outlet of the fourth solenoid valve is connected to the inlet of the vacuum compressor 2062, the outlet of the vacuum compressor 2062 is connected to the inlet of the second one-way valve, the outlet of the second one-way valve is connected to one port of the second three-way valve, the three ports of the second three-way valve are connected to the inlet of the compressor 2061, and the outlet of the compressor 2061 is respectively connected to the membrane separation system 207 and the second mass flow meter 208.

[0035] In some embodiments, the compression system 206 is connected to one port of the third three-way valve, the second port of the third three-way valve is connected to the inlet of the fifth solenoid valve, and the outlet of the fifth solenoid valve is connected to the inlet of the membrane separation system 207 .

[0036] In this embodiment, the outlet of the membrane separation system 207 includes a sulfur hexafluoride outlet and a nitrogen outlet. The sulfur hexafluoride outlet of the membrane separation system 207 is connected to the inlet of the seventh solenoid valve, the outlet of the seventh solenoid valve is connected to the two ends of the fourth three-way valve, the three ports of the third three-way valve are connected to the inlet of the sixth solenoid valve, the outlet of the sixth solenoid valve is connected to one end of the fourth three-way valve, and the three ends of the fourth three-way valve are connected to the inlet of the second mass flowmeter 208.

[0037] In this embodiment, the nitrogen outlet of the membrane separation system 207 is connected to the inlet of the eighth solenoid valve, and the nitrogen is discharged into the air through the eighth solenoid valve.

[0038] In some embodiments, Figure 3 As shown, the membrane separation system 207 is built with a high-precision gas separation membrane for separating sulfur hexafluoride gas and nitrogen for pressure regulation, and the outlet of the membrane separation system includes a nitrogen outlet and a sulfur hexafluoride outlet to facilitate gas separation.

[0039] In some embodiments, 5A molecular sieve and 13X molecular sieve are installed in the pretreatment system to treat impurities in sulfur hexafluoride gas, including water, decomposition products or dust.

[0040] The pressure transmitter is used to monitor the pressure value in the electrical equipment and transmit the value to the recovery device control system. The recovery device control system adjusts the opening and closing and connection of the three-way valve and the electric solenoid valve according to the three conditions of pressure greater than 101kPa, less than 101kPa greater than 5kPa, and less than 5kPa.

[0041] In some embodiments, the recovery device control system is powered by 380V AC. The recovery device control system is equipped with a touch screen for manually controlling valve opening and closing and displaying recovery process data.

[0042] In some embodiments, the electrical equipment for recycling sulfur hexafluoride is provided with a four-way inlet, which is divided into three air inlet pipes and one air outlet pipe. The three air inlet pipes can be respectively connected to the A, B, and C three-phase filling ports of the electrical equipment 100 for recycling sulfur hexafluoride, and the air outlet pipe is connected to the four-way valve 202.

[0043] In some embodiments, the first mass flow meter 203 and the second mass flow meter 208 both have digital display functions, which facilitates the statistics of nitrogen consumption and sulfur hexafluoride gas recovery.

[0044] In some embodiments, the opening and closing of various valves in the present invention are configured with an automatic control system, and can also be manually controlled by an operator.

[0045] In some embodiments, both the air inlet and the air outlet are equipped with quick-connect connectors.

[0046] In some embodiments, Figure 4As shown, a sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device includes a nitrogen gas source 204, a first solenoid valve 301, a first mass flowmeter 203, a first check valve 302, a pressure transmitter 201, a four-way valve 202, a sulfur hexafluoride electrical device 100, a second solenoid valve 303, a pretreatment system 205, a first three-way valve 304, a third solenoid valve 305, a fourth solenoid valve 306, a vacuum compressor 2062, a second check valve 307, a second three-way valve 308, a compressor 2061, a third three-way valve 309, a fifth solenoid valve 310, a membrane separation system 207, an eighth solenoid valve 314, a sixth solenoid valve 311, a seventh solenoid valve 312, a fourth three-way valve 313, a second mass flowmeter 208, and a gas storage tank 209.

[0047] The nitrogen gas source 204 is connected to the inlet of the first solenoid valve 301, the outlet of the first solenoid valve 301 is connected to the inlet of the first mass flowmeter 203, the outlet of the first mass flowmeter 203 is connected to the inlet of the first check valve 302, the outlet of the first check valve 302 is connected to the three ends of the four-way valve 202, the pressure transmitter 201 is connected to the two ends of the four-way valve 202, and one end of the four-way valve 202 is connected to the gas outlet end of the four-way inlet of the sulfur hexafluoride electrical equipment 100. The 4 ends of the 4-way valve 202 are connected to the inlet of the second solenoid valve 303, the outlet of the second solenoid valve 303 is connected to the inlet of the pretreatment system 205, the outlet of the pretreatment system 205 is connected to the 1 end of the first three-way valve 304, the 2 ends of the first three-way valve 304 are connected to the inlet of the third solenoid valve 305, the outlet of the third solenoid valve 305 is connected to the 2 ends of the second three-way valve 308, the 3 ends of the first three-way valve 304 are connected to the inlet of the fourth solenoid valve 306, the outlet of the fourth solenoid valve 306 is connected to the inlet of the vacuum compressor 2062, and the vacuum compressor 2062 is connected to the vacuum compressor 2063. The outlet of the air compressor 2062 is connected to the inlet of the second one-way valve 307, the outlet of the second one-way valve 307 is connected to one end of the second three-way valve 308, the three ends of the second three-way valve 308 are connected to the inlet of the compressor 2061, the outlet of the compressor 2061 is connected to one end of the third three-way valve 309, the two ends of the third three-way valve 309 are connected to the inlet of the fifth solenoid valve 310, the outlet of the fifth solenoid valve 310 is connected to the inlet of the membrane separation system 207, and the nitrogen outlet of the membrane separation system 207 is connected to the inlet of the eighth solenoid valve 314. The sulfur hexafluoride outlet of the membrane separation system 207 is connected to the inlet of the seventh solenoid valve 312, the outlet of the seventh solenoid valve 312 is connected to the two ends of the fourth three-way valve 313, the three ends of the third three-way valve 309 are connected to the inlet of the sixth solenoid valve 311, the outlet of the sixth solenoid valve 311 is connected to one end of the fourth three-way valve 313, the three ends of the fourth three-way valve 313 are connected to the inlet of the second mass flowmeter 208, and the outlet of the second mass flowmeter 208 is connected to the inlet of the gas storage tank 209.

[0048] In this embodiment, the recycling process of the device is:

[0049] (1) When the pressure in the electrical equipment 100 is positive: the SF6 gas in the electrical equipment 100 passes through the pressure transmitter 201 under the action of the internal pressure of the electrical equipment, and the pressure transmitter 201 transmits the gas pressure value to the recovery device control system. At this time, when the pressure value is greater than 101 kPa, the second solenoid valve 303, the third solenoid valve 305, and the sixth solenoid valve 311 are automatically opened, and the first solenoid valve 301, the fourth solenoid valve 306, the fifth solenoid valve 310, the seventh solenoid valve 312 and the eighth solenoid valve 314 are automatically closed. The first three-way valve 304 cuts through end 1 and end 2, the second three-way valve 308 cuts through end 2 and end 3, the third three-way valve 309 cuts through end 1 and end 3, and the fourth three-way valve 313 cuts through end 1 and end 3. The SF6 gas passes through the four-way valve 202 and the second solenoid valve 303 and enters the pretreatment system 205. After removing some impurities from the SF6 gas, it passes through the first three-way valve 304, the third solenoid valve 305, and the second three-way valve 308 and enters the compressor 2061 to pressurize the SF6 gas. The pressurized SF6 gas passes through the third three-way valve 309, the sixth solenoid valve 311, the fourth three-way valve 313, and the second mass flowmeter 208 and enters the storage tank 209. This operation continues until the pressure value of the pressure transmitter is equal to 101 kPa.

[0050] (2) When the pressure in the electrical equipment is negative pressure: the SF6 gas in the electrical equipment passes through the pressure transmitter 201 under the action of the internal pressure of the electrical equipment. The pressure transmitter 201 transmits the gas pressure value to the recovery device control system. At this time, when the pressure value is greater than 5 kPa and less than 101 kPa, the fourth solenoid valve 306 automatically opens, the third solenoid valve 305 automatically closes, the first three-way valve 304 cuts through end 1 and end 3, the second three-way valve 308 cuts through end 1 and end 3, the third three-way valve 309 cuts through end 1 and end 3, and the fourth three-way valve 313 cuts through end 1 and end 3. The SF6 gas passes through the four-way valve 202, the second solenoid valve 3 03, enters the pretreatment system 205, removes some impurities from the SF6 gas, passes through the first three-way valve 304 and the fourth solenoid valve 306, and enters the vacuum compressor 2062. The vacuum compressor 2062 pressurizes the SF6 gas. The pressurized SF6 gas passes through the second one-way valve 307 and the second three-way valve 308 and enters the compressor 2061. The SF6 gas is pressurized. The pressurized SF6 gas passes through the third three-way valve 309, the sixth solenoid valve 311, the fourth three-way valve 313, and the second mass flowmeter 208 and enters the storage tank 209. This operation continues until the pressure value of the pressure transmitter is equal to 5kPa.

[0051] (3) When the pressure in the electrical equipment is close to vacuum: the SF6 gas in the electrical equipment passes through the pressure transmitter 201 under the action of the internal pressure of the electrical equipment, and the pressure transmitter 201 transmits the gas pressure value to the recovery device control system. At this time, when the pressure value is less than 5 kPa, the first solenoid valve 302 automatically opens, the second solenoid valve 303, the third solenoid valve 305, the fourth solenoid valve 306, the fifth solenoid valve 310, the sixth solenoid valve 311, the seventh solenoid valve 312 and the eighth solenoid valve 314 automatically close, the first three-way valve 304 cuts through the 1st and 3rd ends, and the second three-way valve 30 8 cuts through end 1 and end 3, the third three-way valve 309 cuts through end 1 and end 2, the fourth three-way valve 313 cuts through end 2 and end 3, nitrogen starts from the nitrogen source 204, passes through the first solenoid valve 301 and enters the first mass flow meter 203, the first mass flow meter 203 counts the mass of nitrogen passing through, the nitrogen leaves from the outlet of the first mass flow meter 203, passes through the first check valve 302, the pressure transmitter 201, and the four-way valve 202 and enters the SF6 electrical equipment 100, at this time, the control system controls the opening and closing and connection of the solenoid valve and the three-way valve according to the numerical quality of the mass flow meter and the pressure transmitter. When the pressure of the pressure transmitter 201 is 101 kPa, the first solenoid valve 301 is closed, the second solenoid valve 303, the fourth solenoid valve 306, the fifth solenoid valve 310, the seventh solenoid valve 312 and the eighth solenoid valve 314 are opened, and the other valves remain unchanged. The SF6 mixed gas passes through the four-way valve 202 and the second solenoid valve 303 and enters the pretreatment system 205. After removing some impurities from the SF6 mixed gas, it passes through the first three-way valve 304 and the fourth solenoid valve 306 and enters the vacuum compressor 2062. The vacuum compressor 2062 pressurizes the SF6 mixed gas. The pressurized SF6 The gas passes through the second one-way valve 307 and the second three-way valve 308 and enters the compressor 2061 to pressurize the SF6 mixed gas. The pressurized SF6 mixed gas passes through the third three-way valve 309 and the fifth solenoid valve 310 and enters the membrane separation system 207. At this time, the sulfur hexafluoride gas and the nitrogen are separated by the membrane separation device. The separated SF6 gas passes through the seventh solenoid valve 312, the fourth three-way valve 313, and the second mass flow meter 208 and enters the storage tank 209. The nitrogen is discharged into the air through the eighth solenoid valve 314. This operation continues until the sulfur hexafluoride gas recovery in the power equipment is completed.

[0052] The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device provided by the embodiment of the present invention, by setting a nitrogen gas source, when the pressure in the electrical equipment to be recovered sulfur hexafluoride is low, the nitrogen in the nitrogen gas source can be controlled to enter the electrical equipment through the first mass flow meter through the four-way valve, so that the pressure of the mixed gas in the electrical equipment is increased. By setting a compression system, the mixed gas can be further pressurized, which is further conducive to the mixed gas quickly and completely entering the membrane separation system, and realizing the rapid separation of sulfur hexafluoride gas.

[0053] The following is an embodiment of the device of the present invention. For details not described in detail, reference may be made to the corresponding method embodiments described above.

[0054] In addition, the present invention also provides a method for rapid recovery of sulfur hexafluoride by multi-channel mixed gas pressure regulation, which is described in detail as follows:

[0055] When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is vacuum and the pressure is less than a first preset threshold, controlling nitrogen to flow from a nitrogen gas source through a first mass flow meter and a four-way valve into the electrical equipment;

[0056] When it is monitored that the pressure of the mixed gas in the electrical equipment is equal to the second preset threshold, the mixed gas is controlled to enter the pretreatment system to remove impurities in the mixed gas, and after the mixed gas enters the vacuum compressor in the compression system, the vacuum compressor pressurizes the mixed gas, and the mixed gas after the pressurization treatment is pressurized by the compressor, and the pressurized mixed gas is separated into nitrogen and sulfur hexafluoride by the membrane separation system, and the sulfur hexafluoride is controlled to be measured into the sulfur hexafluoride gas storage tank through the second mass flow meter, and the nitrogen is controlled to be discharged into the air; wherein, the first preset threshold is less than the second preset threshold.

[0057] When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is negative pressure and is greater than or equal to a first preset threshold and less than a second preset threshold, the sulfur hexafluoride gas is controlled to enter the pretreatment system to remove impurities in the sulfur hexafluoride gas. After the sulfur hexafluoride gas enters the vacuum compressor in the compression system, the vacuum compressor pressurizes the sulfur hexafluoride gas. The pressurized sulfur hexafluoride gas is measured by the second mass flow meter into the sulfur hexafluoride gas storage tank.

[0058] When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is positive and greater than or equal to a second preset threshold, the sulfur hexafluoride gas is controlled to enter the pretreatment system to remove impurities in the sulfur hexafluoride gas. After the sulfur hexafluoride gas enters the compressor in the compression system, the compressor pressurizes the sulfur hexafluoride gas. The pressurized sulfur hexafluoride gas is measured by the second mass flow meter into the sulfur hexafluoride gas storage tank.

[0059] In some embodiments, the first preset threshold may be 5 kPa, and the second preset threshold may be 101 kPa.

[0060] In some embodiments, Figure 4 Take the sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device provided in as an example to illustrate:

[0061] (1) When the pressure in the electrical equipment 100 is positive: the SF6 gas in the electrical equipment 100 passes through the pressure transmitter 201 under the action of the internal pressure of the electrical equipment, and the pressure transmitter 201 transmits the gas pressure value to the recovery device control system. At this time, when the pressure value is greater than 101 kPa, the second solenoid valve 303, the third solenoid valve 305, and the sixth solenoid valve 311 are automatically opened, and the first solenoid valve 301, the fourth solenoid valve 306, the fifth solenoid valve 310, the seventh solenoid valve 312 and the eighth solenoid valve 314 are automatically closed. The first three-way valve 304 cuts through end 1 and end 2, the second three-way valve 308 cuts through end 2 and end 3, the third three-way valve 309 cuts through end 1 and end 3, and the fourth three-way valve 313 cuts through end 1 and end 3. The SF6 gas passes through the four-way valve 202 and the second solenoid valve 303 and enters the pretreatment system 205. After removing some impurities from the SF6 gas, it passes through the first three-way valve 304, the third solenoid valve 305, and the second three-way valve 308 and enters the compressor 2061 to pressurize the SF6 gas. The pressurized SF6 gas passes through the third three-way valve 309, the sixth solenoid valve 311, the fourth three-way valve 313, and the second mass flowmeter 208 and enters the storage tank 209. This operation continues until the pressure value of the pressure transmitter is equal to 101 kPa.

[0062] (2) When the pressure in the electrical equipment is negative pressure: the SF6 gas in the electrical equipment passes through the pressure transmitter 201 under the action of the internal pressure of the electrical equipment. The pressure transmitter 201 transmits the gas pressure value to the recovery device control system. At this time, when the pressure value is greater than 5 kPa and less than 101 kPa, the fourth solenoid valve 306 automatically opens, the third solenoid valve 305 automatically closes, the first three-way valve 304 cuts through end 1 and end 3, the second three-way valve 308 cuts through end 1 and end 3, the third three-way valve 309 cuts through end 1 and end 3, and the fourth three-way valve 313 cuts through end 1 and end 3. The SF6 gas passes through the four-way valve 202, the second solenoid valve 3 03, enters the pretreatment system 205, removes some impurities from the SF6 gas, passes through the first three-way valve 304 and the fourth solenoid valve 306, and enters the vacuum compressor 2062. The vacuum compressor 2062 pressurizes the SF6 gas. The pressurized SF6 gas passes through the second one-way valve 307 and the second three-way valve 308 and enters the compressor 2061. The SF6 gas is pressurized. The pressurized SF6 gas passes through the third three-way valve 309, the sixth solenoid valve 311, the fourth three-way valve 313, and the second mass flowmeter 208 and enters the storage tank 209. This operation continues until the pressure value of the pressure transmitter is equal to 5kPa.

[0063] (3) When the pressure in the electrical equipment is close to vacuum: the SF6 gas in the electrical equipment passes through the pressure transmitter 201 under the action of the internal pressure of the electrical equipment, and the pressure transmitter 201 transmits the gas pressure value to the recovery device control system. At this time, when the pressure value is less than 5 kPa, the first solenoid valve 302 automatically opens, the second solenoid valve 303, the third solenoid valve 305, the fourth solenoid valve 306, the fifth solenoid valve 310, the sixth solenoid valve 311, the seventh solenoid valve 312 and the eighth solenoid valve 314 automatically close, the first three-way valve 304 cuts through the 1st and 3rd ends, and the second three-way valve 30 8 cuts through end 1 and end 3, the third three-way valve 309 cuts through end 1 and end 2, the fourth three-way valve 313 cuts through end 2 and end 3, nitrogen starts from the nitrogen source 204, passes through the first solenoid valve 301 and enters the first mass flow meter 203, the first mass flow meter 203 counts the mass of nitrogen passing through, the nitrogen leaves from the outlet of the first mass flow meter 203, passes through the first check valve 302, the pressure transmitter 201, and the four-way valve 202 and enters the SF6 electrical equipment 100, at this time, the control system controls the opening and closing and connection of the solenoid valve and the three-way valve according to the numerical quality of the mass flow meter and the pressure transmitter. When the pressure of the pressure transmitter 201 is 101 kPa, the first solenoid valve 301 is closed, the second solenoid valve 303, the fourth solenoid valve 306, the fifth solenoid valve 310, the seventh solenoid valve 312 and the eighth solenoid valve 314 are opened, and the other valves remain unchanged. The SF6 mixed gas passes through the four-way valve 202 and the second solenoid valve 303 and enters the pretreatment system 205. After removing some impurities from the SF6 mixed gas, it passes through the first three-way valve 304 and the fourth solenoid valve 306 and enters the vacuum compressor 2062. The vacuum compressor 2062 pressurizes the SF6 mixed gas. The pressurized SF6 The gas passes through the second one-way valve 307 and the second three-way valve 308 and enters the compressor 2061 to pressurize the SF6 mixed gas. The pressurized SF6 mixed gas passes through the third three-way valve 309 and the fifth solenoid valve 310 and enters the membrane separation system 207. At this time, the sulfur hexafluoride gas and the nitrogen are separated by the membrane separation device. The separated SF6 gas passes through the seventh solenoid valve 312, the fourth three-way valve 313, and the second mass flow meter 208 and enters the storage tank 209. The nitrogen is discharged into the air through the eighth solenoid valve 314. This operation continues until the sulfur hexafluoride gas recovery in the power equipment is completed.

[0064] The method for rapid recovery of sulfur hexafluoride by multi-channel mixed gas pressure regulation provided by the embodiment of the present invention provides a nitrogen gas source. When the pressure in the electrical equipment to be recovered from sulfur hexafluoride is low, the nitrogen in the nitrogen gas source can be controlled to enter the electrical equipment through a first mass flow meter and a four-way valve, so that the pressure of the mixed gas in the electrical equipment is increased. The mixed gas can be further pressurized by providing a compression system, which further facilitates the mixed gas to quickly and completely enter the membrane separation system, thereby realizing rapid separation of sulfur hexafluoride gas.

[0065] It should be understood that the order of execution of the steps in the above embodiment does not necessarily mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiment of the present invention.

[0066] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0067] Those of ordinary skill in the art will appreciate that the templates, units, and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0068] If the module / unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium. When the computer program is executed by the processor, it can implement the steps of the above-mentioned various sulfur hexafluoride multi-channel mixed gas pressure regulation rapid recovery method embodiments. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal and software distribution medium.

[0069] The embodiments described above are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention, and should all be included in the protection scope of the present invention.

Claims

1. A sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device, characterized in that: It includes electrical equipment for recovering sulfur hexafluoride, a four-way valve, a pressure transmitter, a first mass flow meter, a nitrogen gas source, a pretreatment system, a compression system, a membrane separation system, a second mass flow meter and a sulfur hexafluoride gas storage tank; The nitrogen gas source is connected to the first mass flowmeter through a first solenoid valve, the first mass flowmeter is connected to the three ports of the four-way valve through a first one-way valve, the pressure transmitter is connected to the two ports of the four-way valve, the electrical equipment is connected to one port of the four-way valve, the four ports of the four-way valve are connected to the pretreatment system, the pretreatment system is connected to the compression system, the compression system is respectively connected to the membrane separation system and the second mass flowmeter, the inlet of the second mass flowmeter is connected to the sulfur hexafluoride outlet of the membrane separation system, and the outlet of the second mass flowmeter is connected to the inlet of the sulfur hexafluoride gas storage tank.

2. The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device according to claim 1, characterized in that: The compression system includes a vacuum compressor and a compressor; The outlet of the pretreatment system is connected to one port of the first three-way valve, the two ports of the first three-way valve are connected to the inlet of the third solenoid valve, and the outlet of the third solenoid valve is connected to the two ports of the second three-way valve; the three ports of the first three-way valve are connected to the inlet of the fourth solenoid valve, the outlet of the fourth solenoid valve is connected to the inlet of the vacuum compressor, the outlet of the vacuum compressor is connected to the inlet of the second one-way valve, the outlet of the second one-way valve is connected to one port of the second three-way valve, the three ports of the second three-way valve are connected to the inlet of the compressor, and the outlet of the compressor is respectively connected to the membrane separation system and the second mass flowmeter.

3. The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device according to claim 1, characterized in that: The compression system is connected to one port of the third three-way valve, the second port of the third three-way valve is connected to the inlet of the fifth solenoid valve, and the outlet of the fifth solenoid valve is connected to the inlet of the membrane separation system.

4. The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device according to claim 3, characterized in that: The sulfur hexafluoride outlet of the membrane separation system is connected to the inlet of the seventh solenoid valve, the outlet of the seventh solenoid valve is connected to the two ends of the fourth three-way valve, the three ports of the third three-way valve are connected to the inlet of the sixth solenoid valve, the outlet of the sixth solenoid valve is connected to one end of the fourth three-way valve, and the three ends of the fourth three-way valve are connected to the inlet of the second mass flowmeter.

5. The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device according to any one of claims 1 to 4, characterized in that: The nitrogen outlet of the membrane separation system is connected to the inlet of the eighth solenoid valve.

6. The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device according to any one of claims 1 to 4, characterized in that: The membrane separation system is equipped with a high-precision gas separation membrane for separating sulfur hexafluoride gas and nitrogen for pressure regulation, and the outlet of the membrane separation system includes a nitrogen outlet and a sulfur hexafluoride outlet.

7. The sulfur hexafluoride multi-channel mixed gas pressure regulating rapid recovery device according to any one of claims 1 to 4, characterized in that: The pretreatment system is equipped with 5A molecular sieve and 13X molecular sieve to treat impurities in sulfur hexafluoride gas; the pressure transmitter is used to monitor the pressure value in the electrical equipment and transmit the value to the recovery device control system.

8. A method for rapid recovery of sulfur hexafluoride by multi-channel mixed gas pressure regulation, based on the sulfur hexafluoride multi-channel mixed gas pressure regulation rapid recovery device according to any one of claims 1 to 7, characterized in that: include: When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is vacuum and the pressure is less than a first preset threshold, controlling nitrogen to flow from a nitrogen gas source through a first mass flow meter and a four-way valve into the electrical equipment; When it is monitored that the pressure of the mixed gas in the electrical equipment is equal to the second preset threshold, the mixed gas is controlled to enter the pretreatment system to remove impurities in the mixed gas, and after the mixed gas enters the vacuum compressor in the compression system, the vacuum compressor pressurizes the mixed gas, and the mixed gas after the pressurization treatment is pressurized by the compressor, and the pressurized mixed gas is separated into nitrogen and sulfur hexafluoride by the membrane separation system, and the sulfur hexafluoride is controlled to be measured into the sulfur hexafluoride gas storage tank through the second mass flow meter, and the nitrogen is controlled to be discharged into the air; wherein, the first preset threshold is less than the second preset threshold.

9. The method for rapid recovery of sulfur hexafluoride by multi-channel gas mixing and pressure regulation according to claim 8, characterized in that: The method further comprises: When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is negative pressure and is greater than or equal to a first preset threshold and less than a second preset threshold, the sulfur hexafluoride gas is controlled to enter the pretreatment system to remove impurities in the sulfur hexafluoride gas. After the sulfur hexafluoride gas enters the vacuum compressor in the compression system, the vacuum compressor pressurizes the sulfur hexafluoride gas. The pressurized sulfur hexafluoride gas is measured by the second mass flow meter into the sulfur hexafluoride gas storage tank.

10. The method for rapid recovery of sulfur hexafluoride by multi-channel mixed gas pressure regulation according to claim 8 or 9, characterized in that: The method further comprises: When it is monitored that the pressure in the electrical equipment for recovering sulfur hexafluoride is positive and greater than or equal to a second preset threshold, the sulfur hexafluoride gas is controlled to enter the pretreatment system to remove impurities in the sulfur hexafluoride gas. After the sulfur hexafluoride gas enters the compressor in the compression system, the compressor pressurizes the sulfur hexafluoride gas. The pressurized sulfur hexafluoride gas is measured by the second mass flow meter into the sulfur hexafluoride gas storage tank.

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