CN113353892A - Gas purification system for SF6 gas station and purification method thereof - Google Patents
Gas purification system for SF6 gas station and purification method thereof Download PDFInfo
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- CN113353892A CN113353892A CN202110594277.1A CN202110594277A CN113353892A CN 113353892 A CN113353892 A CN 113353892A CN 202110594277 A CN202110594277 A CN 202110594277A CN 113353892 A CN113353892 A CN 113353892A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B17/00—Sulfur; Compounds thereof
- C01B17/45—Compounds containing sulfur and halogen, with or without oxygen
- C01B17/4507—Compounds containing sulfur and halogen, with or without oxygen containing sulfur and halogen only
- C01B17/4515—Compounds containing sulfur and halogen, with or without oxygen containing sulfur and halogen only containing sulfur and fluorine only
- C01B17/453—Sulfur hexafluoride
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/20—Disposition of valves, e.g. of on-off valves or flow control valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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Abstract
The invention discloses a gas purification system for an SF6 gas station, which comprises: the refrigeration branch is used for reducing the set temperature in the purification tank; the gas recovery branch is used for filtering water and particle impurities in SF6 gas in the gas station and pressing the processed SF6 gas into the first purification unit and the second purification unit; and the purification buffer branch is used for completing purification of the processed SF6 gas, and pressurizing and forcibly cooling the gaseous mixed gas released from the first purification unit and the mixed gas into the second purification unit for further pressurization. The invention is communicated by designing the refrigeration branch and the purification buffering branch, and adopts a low-temperature and high-pressure mode to be matched with an oil-free compressor to pressurize gas by two-stage automatic circulation purification under different low temperatures and pressures, so that the purification efficiency is higher.
Description
Technical Field
The invention belongs to the field of fluids, and particularly relates to a gas purification system for an SF6 gas station and a purification method thereof.
Background
SF6 gas is generally used as an insulation and arc extinguishing medium gas for high-voltage switches, transformers, high-voltage transmission and transformation lines, etc., and is widely used in the electric power operation and electric appliance manufacturing industries. However, after the electric appliance is operated for a long time, the gas generates decomposed products and water enters after actions such as arc extinction, the purity of the gas is reduced, the insulation and arc extinction performance is affected, particularly in an electric appliance manufacturing factory, the SF6 gas is repeatedly used, air, water, dust and the like are mixed into the gas, the performance of the SF6 gas is reduced, and the defective products and even the scrapped electric appliance products are seriously caused.
Because the daily gas consumption of an electrical appliance manufacturing enterprise is large, the circulation times are high, after the gas purity is reduced, rapid purification cannot be carried out according to the production frequency requirement of a factory, and even the enterprise discharges a large amount of SF6 mixed with air into the atmosphere, so that the greenhouse effect is serious.
Disclosure of Invention
The purpose of the invention is as follows: a gas purification system for SF6 gas stations is provided to solve the problems involved in the background art.
The technical scheme is as follows: a gas purification system for a SF6 gas station, comprising:
the refrigeration branch is used for reducing the set temperature in the purification tank;
the gas recovery branch is used for filtering water and particle impurities in SF6 gas in the gas station and pressing the processed SF6 gas into the first purification unit and the second purification unit;
and the purification buffer branch is used for completing purification of the processed SF6 gas, and pressurizing and forcibly cooling the gaseous mixed gas released from the first purification unit and the mixed gas into the second purification unit for further pressurization.
In a further embodiment, the gas recovery branch comprises a gas recovery pipeline, and a recovery self-sealing joint, a recovery first pressure reducer, a recovery moisture filter, a recovery particle filter, a recovery first electromagnetic valve, a recovery second pressure reducer, a recovery compressor and a recovery second electromagnetic valve which are sequentially arranged on the gas recovery pipeline;
the recovery compressor is an oil-free compressor; adopt the special compressor of oil-free lubrication's SF6 to pressurize for SF6 gas, have oil lubrication's compressor can take the oil content to get into in gas or the jar, cause secondary pollution, and the oil content is difficult for driving, and lubricating oil is very big to the electric appliance insulation test influence, even scrapps the product.
The gas recovery branch is designed, and the problems of low purity of unqualified SF6 gas due to large moisture content and low granularity content and size of gas used by national standard during the operation of electric appliances are solved by additionally arranging a moisture recovery filter and a particle recovery filter.
In a further embodiment, the purge buffer circuit includes a first purge unit in communication with the gas recovery conduit, a buffer unit in communication with the first purge unit, and a second purge unit in communication with the buffer unit;
through automatic circulation purification under the different low temperature of two-stage and pressure, adopted low temperature increase pressure mode and cooperate oil free compressor to pressurize gas simultaneously for purification efficiency is higher.
In a further embodiment, the first purification unit comprises a low-temperature-resistant pressure tank communicated with the gas recovery pipeline, a first purification pipeline communicated with the low-temperature pressure tank, and a first purification pressure sensor and a first purification solenoid valve which are sequentially installed on the first purification pipeline;
and a first purification pressure gauge, a first purification safety valve, a first purification liquid level sensor and a first purification liquid observation mirror are arranged on the low-temperature pressure tank.
In a further embodiment, the buffer unit comprises a buffer tank communicated with the first purification pipeline, a buffer pipeline communicated with the buffer tank, and a buffer pressure sensor, a buffer pressure reducer, a buffer compressor, a buffer particle filter and a buffer electromagnetic valve which are sequentially arranged on the buffer pipeline;
a buffer pressure gauge and a buffer safety valve are arranged on the buffer tank;
the buffer compressor is an oil-free compressor.
In a further embodiment, the second purification unit comprises a high-pressure cryogenic storage tank in communication with a buffer tube, an evacuation unit and a pressure relief unit in communication with the high-pressure cryogenic storage tank;
a second purification pressure gauge, a second purification safety valve, a second purification liquid level sensor and a second purification liquid level observation mirror are arranged on the high-pressure low-temperature storage tank;
the pressure relief work of the second purification unit is completed by designing the evacuation unit and the pressure relief unit, and the situation that the second purification unit is damaged due to high pressure is avoided.
In a further embodiment, the evacuation unit comprises an evacuation pipeline communicated with the high-pressure cryogenic storage tank, and an evacuation pressure sensor, an evacuation solenoid valve and an evacuation manual ball valve which are sequentially mounted on the evacuation pipeline;
the pressure relief unit comprises a pressure relief pipeline communicated with the high-pressure cryogenic storage tank and the gas recovery pipeline;
and a pressure relief valve is arranged on the pressure relief pipeline.
In a further embodiment, a liquid beating unit is communicated below the purification buffering branch;
the liquid pumping unit comprises a liquid pumping pipeline which is respectively communicated with the low-temperature-resistant pressure tank, the buffer tank and the high-pressure low-temperature storage tank;
the liquid pumping pipeline is provided with a liquid pump and a liquid pumping self-sealing joint;
the method for removing gas by adopting the low-temperature pressurizing liquid pump not only can pump the liquid SF6 gas into various high-pressure containers, but also can easily and perfectly pump SF6 steel cylinders, and other plunger pumps or liquid pumping pumps have poor low-temperature effects, so that the sealing damage is easily caused and air or oil is mixed.
In a further embodiment, the refrigeration branch comprises a refrigeration pipeline, and a condensation pipe, an expansion valve and a temperature sensor which are communicated with the refrigeration pipeline and respectively installed in the low-temperature-resistant pressure tank and the high-pressure low-temperature storage tank;
a first refrigeration electromagnetic valve is arranged on the communication part of the refrigeration pipeline and the outlet end of the condensation pipe in the low-temperature resistant pressure tank;
and a second refrigeration electromagnetic valve is arranged on the communication part of the refrigeration pipeline and the outlet end of the condensation pipe in the high-pressure low-temperature storage tank.
A purification method of a gas purification system for an SF6 gas station comprises the following steps:
s1, starting a refrigeration branch, wherein the temperature in the low-temperature-resistant pressure tank is required to be-15 to-30 ℃, and the temperature in the high-pressure low-temperature storage tank is required to be-30 to-40 ℃;
s2, decompressing the SF6 gas with insufficient purity through a gas recovery branch circuit, and allowing the SF6 gas to enter a low-temperature-resistant pressure tank;
after the strong refrigeration, SF6 gas is liquefied rapidly, and when the pressure in the low-temperature resistant pressure tank reaches 38bar or the liquid level reaches 2/3, the gas recovery branch stops working;
in the processes of S3 and S2, when the low-temperature-resistant pressure tank continuously enters gas, the liquid level of SF6 in the low-temperature-resistant pressure tank rises, and when the liquid level reaches a position 2/3 measured by the first purification liquid level sensor, two working modes are carried out:
1. when the pressure in the low-temperature resistant pressure tank is less than 38bar, the liquid level reaches 2/3 measured by the first purification liquid level sensor, and the work of the gas recovery branch is closed;
2. when the pressure reaches 38bar and the liquid level does not reach 2/3, the low-temperature resistant pressure tank is kept still for 3 minutes outside the work of closing the gas recovery branch, and then a first purification electromagnetic valve is opened to discharge the pressure in the low-temperature resistant pressure tank into a buffer tank;
when the pressure in the low-temperature resistant pressure tank is reduced to 25-28 bar, closing the first purification electromagnetic valve;
when the pressure of the buffer tank reaches 40bar, closing the first purification electromagnetic valve;
S4A, after the mixed gas released from the low-temperature-resistant pressure tank enters the buffer tank, the high-pressure mixed gas enters the high-pressure low-temperature storage tank through the buffer compressor;
when the pressure in the buffer tank is less than 1bar, the buffer compressor stops working, and the buffer electromagnetic valve is closed;
when the pressure in the high-pressure cryogenic storage tank is greater than 45bar, stopping the buffer compressor;
S4B, when the pressure in the low-temperature-resistant pressure tank is lower than 28bar, the liquid level is lower than 2/3 measured by the first purification liquid level sensor, and the pressure in the high-pressure low-temperature storage tank is higher than 45bar, opening a pressure release valve, releasing the pressure in the high-pressure low-temperature storage tank to 25-35 bar, and allowing discharged gas during pressure release to enter the low-temperature-resistant pressure tank through a recovery pipeline;
when the pressure in the low-temperature resistant pressure tank is higher than 38bar, or the liquid level is higher than 2/3 measured by the first purification liquid level sensor, closing the pressure relief valve;
after the pressure relief valve releases the pressure of the high-pressure low-temperature storage tank, when the pressure in the high-pressure low-temperature storage tank is still higher than 38bar, the evacuation electromagnetic valve is opened to complete the release of the pressure in the high-pressure low-temperature storage tank, and when the pressure in the high-pressure low-temperature storage tank is 35bar, the evacuation electromagnetic valve is closed;
if manual deflation is selected to enter the waste gas cylinder, manually opening an emptying manual ball valve until an emptying pressure sensor indicates that the pressure in the high-pressure low-temperature storage tank is 35bar, and closing the emptying manual ball valve;
the step S4A, S4B can be synchronously performed;
s5, under the operation of S4A, S4B, the condition
1. The pressure in the low-temperature resistant pressure tank is lower than 28bar, and the liquid level is lower than 2/3;
2. the pressure in the high-pressure cryogenic storage tank is lower than 38 bar;
s51, the gas recovery branch can be selectively opened until the liquid level in the low-temperature-resistant pressure tank reaches 2/3 measured by the first purification liquid level sensor, and then a liquid pump is started to pump liquid into a container;
and S52, directly selecting to pump liquid, and automatically pumping the liquid by the liquid pump until the liquid levels of the low-temperature-resistant pressure tank and the high-pressure low-temperature storage tank reach the 1/10 positions measured by the first purification liquid level sensor and the second purification liquid level sensor.
Has the advantages that: the invention relates to a gas purification system for an SF6 gas station, which is characterized in that a refrigeration branch and a purification buffer branch are designed to be communicated, two-stage automatic circulation purification under different low temperature and pressure is realized, a low temperature and high pressure mode is adopted and an oil-free compressor is matched to pressurize gas, so that the purification efficiency is higher, the compressed SF6 gas does not need oil filtration, a gas recovery branch is designed, and a water recovery filter and a particle recovery filter are additionally arranged, so that the problem that the unqualified SF6 gas is not high in purity due to large water content is solved, and the problems of granularity content and size of the gas used by national standards during the operation of electric appliances are also solved.
Drawings
Fig. 1 is a schematic structural view of the present invention.
FIG. 2 is a schematic view of the gas recovery branch of the present invention.
Fig. 3 is a schematic diagram of the purge buffer branch of the present invention.
Fig. 4 is a schematic diagram of the refrigeration circuit of the present invention.
FIG. 5 is a schematic view of an evacuation unit, a pressure relief unit, and a liquid injection unit of the present invention.
Fig. 6 is a schematic diagram of the gas station system of the present invention in two states requiring purge gas.
The reference signs are: a gas recovery branch 1, a recovery self-sealing joint 11, a recovery first pressure reducer 12, a recovery moisture filter 13, a recovery particle filter 14, a recovery first electromagnetic valve 15, a recovery second pressure reducer 16, a recovery compressor 17, a recovery second electromagnetic valve 18, a gas recovery pipeline 19, a refrigeration branch 2, a refrigeration pipeline 21, a refrigeration compressor 22, a condenser 23, an evaporator 24, a first refrigeration electromagnetic valve 25, a second refrigeration electromagnetic valve 26, a condenser pipe 27, a temperature sensor 28, a purification buffer branch 3, a low temperature resistant pressure tank 111, a first purification pipeline 112, a first purification pressure sensor 113, a first purification electromagnetic valve 114, a first purification pressure gauge 115, a first purification safety valve 116, a first purification liquid level sensor 117, a buffer tank 121, a buffer pipeline 122, a buffer pressure sensor 123, a buffer pressure reducer 124, a buffer compressor 125, a buffer particle filter 126, The device comprises a buffer electromagnetic valve 127, a buffer pressure gauge 128, a buffer safety valve 129, a high-pressure low-temperature storage tank 131, a second purification pressure gauge 132, a second purification safety valve 133, a second purification liquid level sensor 134, an emptying unit 4, an emptying pipeline 41, an emptying pressure sensor 42, an emptying electromagnetic valve 43, an emptying manual ball valve 44, a pressure relief pipeline 45, a liquid pumping unit 5, a liquid pumping pipeline 51, a liquid pump 52, a liquid pumping self-sealing joint 53 and a pressure relief unit 6.
Detailed Description
The reason for this problem (poor purification effect of the existing SF6 gas) is that the purification system of SF6 gas is also available on the market, and there are the following main types:
1. a vehicle-mounted SF6 purification system is mainly used for power enterprises operating high-voltage electric appliances, when insulation alarm occurs to the electric appliances, SF6 gas in the electric appliances needs to be completely recovered and enters a freezing tank when power failure occurs, SF6 is liquefied and ice is made, then air on an ice surface is pumped out by a vacuum pump, SF6 dry ice is heated to be changed into liquid, and then the liquid is heated and gasified to be charged into the electric appliances for use. The equipment has high manufacturing cost, has quite high requirements on pipelines, pressure containers, control valves and pressure temperature sensors, and can be generally cooled to the state of dry ice at the temperature of below-60 ℃, so the low-temperature performance requirements on the materials of the manufacturing device are very high, and high-power refrigeration equipment is required, some refrigeration equipment even uses liquid nitrogen to cool a gas tank and a pipeline, the thermal efficiency is very low, the cost is very high, and the method is not economical. The market price of the equipment is about 160 ten thousand RMB, compared with 32 tons of SF6 fresh gas, most users prefer to replace the fresh gas and do not need to purchase the equipment, and the later trouble of waste gas treatment caused by the replacement of the fresh gas is more.
2. The SF6 gas is separated from air using a permeable membrane technology, either a permeable membrane dedicated to custom SF6 or a permeable membrane dedicated to custom nitrogen. At present, the domestic osmotic membrane technology needs to be improved, the price is high, the equipment requires constant temperature and constant pressure, meanwhile, because the osmotic membrane pores are ultramicro membrane pores and are measured by the molecular diameter, the granularity of the running SF6 gas or the new SF6 gas is much larger than that of micropores, the granularity in the SF6 gas which can be used by the national standard can be met when the granularity is less than 1um, and the granules have great harm to the osmotic membrane and cause blockage when being serious. At present, most of similar devices adopt imported permeable membranes, the price per square meter is above 20 ten thousand, the manufacturing cost of the devices is seriously challenged, the replacement of the permeable membranes is not a simple problem, and the general market price of the devices reaches about 250 ten thousand RMB and is 50 tons compared with that of SF6 fresh gas.
3. The simple purification device mainly adopts a compression refrigeration method, gas is compressed and enters a pre-refrigerated low-temperature pressure container, SF6 gas is liquefied, the principle that impurity gas cannot be liquefied at the same temperature is utilized, SF6 and the impurity gas are layered in the same pressure container, the liquid is arranged at the lower end of the container, the gaseous impurity gas and the gaseous SF6 mixed gas are arranged at the upper end of the pressure container, part of the mixed gas is removed through an emptying valve, unqualified gas is filled after the pressure is reduced, and the liquid SF6 is filled into a clean container through a liquid pump until the liquid SF6 reaches a certain amount in the pressure container and is ready to be reused. The method is simple and easy to implement, but the purity of the extracted liquid SF6 can only reach below 99%, when the purity of the purified SF6 gas is lower than 80%, the purity after purification can only reach 95%, moreover, the mixed gas discharged during purification has high SF6 content which is higher than 25%, the discharged gas pollutes the environment, and the SF6 gas loss is serious.
In summary, the above devices have the following problems: the equipment configuration is complex, the material consumption is large, for example, the liquid nitrogen consumption is large, the use is dangerous, operators are easy to be frostbitten, the loss is large, the liquid nitrogen is inconvenient to supplement on site, and the liquid nitrogen transportation risk is high; the adoption of the permeable membrane technology has the disadvantages of high cost, large gas loss, complex constant-temperature and constant-pressure control, low efficiency, inconvenient membrane replacement after membrane blockage, need of making expensive spare parts and long time for importing membrane materials. The energy consumption of the equipment is large; the equipment has large volume, heavy weight, difficult transportation and difficult field movement; the override is complex, and the requirement on personnel is high; the amount of gas to be treated on site is not large, the time for putting equipment into use is long, the requirement on time for site treatment is tight, the equipment cannot be operated on line, and the treatment after power failure of the operated electrical equipment is needed; for an electrical appliance manufacturing factory, the devices are not suitable for purifying SF6 on line by running devices, such as a gas station system, and the full-automatic online processing is realized without influencing the work of a gas station under the condition of incapability of stopping the system.
The invention provides a gas purification system for an SF6 gas station, which can purify and process SF6 gas on line under the condition of not influencing the gas used by a user, the invention provides automatic circulating purification under two stages of different low temperatures and pressures, the purification efficiency is high, the consumable material is very little and cheap, the replacement is easy, a low-temperature high-pressure mode is adopted, the energy consumption of equipment is very low, ice making is not needed, and the purity gas with the purity of more than 99.8 percent can be purified without methods such as vacuum pumping and the like, the purity can meet the use requirements of the user, the industrial gas purity standard is also reached, and the SF6 gas after being pressurized and compressed by adopting an oil-free compressor does not need oil filtration. Only a moisture filter and a particle filter are needed to be additionally arranged, the problem that the unqualified SF6 gas is low in purity due to large moisture content is solved, the problem of the granularity content and size of the gas used by the national standard during the operation of an electric appliance is also solved, and the purification requirement can be met by an independent low-power refrigerator. The independent gas pressurization system and the circulating system facilitate the control and the operation of the device;
SF6 gas in the gas station gas tank needs to be purified, and after purification by the purification system, 2 storage modes are provided, one mode is to be pumped back to the gas tank, and the other mode is to be stored in a liquid storage tank.
The mixed gas of SF6 and miscellaneous gas at the upper part of the liquid tank of the gas station needs to be purified, and 2 storage modes are provided after the mixed gas is purified by a purification system, and one mode is to be pumped back to the gas tank. One is to store to a liquid storage tank.
The design forms a closed cycle from gas entering purification to removal or storage, can be controlled by a full-automatic process, and can start and stop a purification device according to the measurement of pressure and purity.
A gas purification system for an SF6 gas station comprises: the refrigeration branch 2 is used for reducing the set temperature in the purification tank; the gas recovery branch 1 is used for filtering water and particle impurities in SF6 gas in the gas station and pressing the processed SF6 gas into the first purification unit and the second purification unit; and the purification buffer branch 3 is used for completing purification of the processed SF6 gas, and pressurizing and forcibly cooling the gaseous mixed gas released from the first purification unit and the mixed gas into the second purification unit for further pressurization.
The gas recovery branch 1 comprises a gas recovery pipeline 19, and a recovery self-sealing joint 11, a recovery first pressure reducer 12, a recovery moisture filter 13, a recovery particle filter 14, a recovery first electromagnetic valve 15, a recovery second pressure reducer 16, a recovery compressor 17 and a recovery second electromagnetic valve 18 which are sequentially arranged on the gas recovery pipeline 19;
the recovery compressor 17 is an oil-free compressor; adopt the special compressor of oil-free lubrication's SF6 to pressurize for SF6 gas, have oil lubrication's compressor can take the oil content to get into in gas or the jar, cause secondary pollution, and the oil content is difficult for driving, and lubricating oil is very big to the electric appliance insulation test influence, even scrapps the product.
The gas recovery branch 1 is designed, and the problems of low purity of unqualified SF6 gas due to high moisture content and low granularity content and size of gas used by national standard during the operation of electric appliances are solved by additionally arranging the recovered moisture filter 13 and the recovered particle filter 14.
Said purification buffer circuit 3 comprises a first purification unit in communication with gas recovery line 19, a buffer unit in communication with said first purification unit, and a second purification unit in communication with said buffer unit;
through automatic circulation purification under the different low temperature of two-stage and pressure, adopted low temperature increase pressure mode and cooperate oil free compressor to pressurize gas simultaneously for purification efficiency is higher.
The first purification unit includes a low temperature resistant pressure tank 111 communicated with the gas recovery pipeline 19, a first purification pipeline 112 communicated with the low temperature pressure tank, and a first purification pressure sensor 113 and a first purification solenoid valve 114 sequentially installed on the first purification pipeline 112;
and a first purification pressure gauge 115, a first purification safety valve 116, a first purification liquid level sensor 117 and a first purification liquid observation mirror are arranged on the low-temperature pressure tank.
The buffer unit includes a buffer tank 121 communicating with the first purification pipe 112, a buffer pipe 122 communicating with the buffer tank 121, and a buffer pressure sensor 123, a buffer pressure reducer 124, a buffer compressor 125, a buffer particulate filter 126, a buffer solenoid valve 127, which are sequentially installed on the buffer pipe 122;
a buffer pressure gauge 128 and a buffer safety valve 129 are arranged on the buffer tank 121;
the buffer compressor 125 is an oil-free compressor.
The second purification unit comprises a high-pressure cryogenic storage tank 131 communicated with a buffer tube, an evacuation unit 4 and a pressure relief unit 6 communicated with the high-pressure cryogenic storage tank 131;
a second purification pressure gauge 132, a second purification safety valve 133, a second purification liquid level sensor 134 and a second purification liquid level observation mirror are arranged on the high-pressure low-temperature storage tank 131;
the pressure relief work of the second purification unit is completed by designing the evacuation unit 4 and the pressure relief unit 6, and the situation that the second purification unit is damaged due to high pressure is avoided.
The evacuation unit 4 comprises an evacuation pipeline 41 communicated with the high-pressure cryogenic storage tank 131, and an evacuation pressure sensor 42, an evacuation solenoid valve 43 and an evacuation manual ball valve 44 which are sequentially mounted on the evacuation pipeline 41;
said pressure relief unit 6 comprises a pressure relief pipeline 45 communicating with said high-pressure cryogenic storage tank 131 and with said gas recovery pipeline 19;
a pressure relief valve is arranged on the pressure relief pipeline 45.
A liquid beating unit 5 is communicated below the purification buffering branch 3;
the liquid pumping unit 5 comprises a liquid pumping pipeline 51 which is respectively communicated with the low-temperature-resistant pressure tank 111, the buffer tank 121 and the high-pressure low-temperature storage tank 131;
the liquid pumping pipeline 51 is provided with a liquid pump 52 and a liquid pumping self-sealing joint 53;
the liquid injection pipes comprise three groups of liquid injection branch pipes which are respectively communicated with the low-temperature-resistant pressure tank 111, the buffer tank 121 and the high-pressure low-temperature storage tank 131, and liquid injection main pipes which are communicated with the liquid injection branch pipes;
a liquid pumping branch pipe communicated with the buffer tank 121 is communicated with a liquid pumping branch pipe communicated with the high-pressure low-temperature storage tank 131, and a second liquid pumping electromagnetic valve is arranged on the liquid pumping branch pipe communicated with the high-pressure low-temperature storage tank 131;
a first buffering manual ball valve is arranged on the liquid pumping branch pipe communicated with the buffer tank 121;
a second buffering manual ball valve and a third buffering manual ball valve are arranged between the liquid pumping branch pipe communicated with the buffer tank 121 and the liquid pumping branch pipe communicated with the low-temperature-resistant pressure tank 111.
The liquid pump 52 and the liquid pumping self-sealing joint 53 are arranged on the liquid pumping main pipe;
a first liquid beating electromagnetic valve is arranged on the liquid beating branch pipe communicated with the low temperature resistant pressure tank 111;
the method for removing gas by adopting the low-temperature pressurizing liquid pump 52 not only can pump the liquid SF6 gas into various high-pressure containers, but also can easily and perfectly pump SF6 steel cylinders, and other plunger pumps or liquid pumping pumps have poor low-temperature effects, so that the sealing is easy to damage and air or oil is mixed.
The refrigeration branch 2 comprises a refrigeration pipeline 21, and a condensation pipe 27, an expansion valve and a temperature sensor 28 which are communicated with the refrigeration pipeline 21 and respectively arranged in a low-temperature-resistant pressure tank 111 and a high-pressure low-temperature storage tank 131;
a first refrigeration electromagnetic valve 25 is arranged on the communication part of the refrigeration pipeline 21 and the outlet end of the condensation pipe 27 in the low-temperature resistant pressure tank 111;
a second refrigeration electromagnetic valve 26 is arranged on the part of the refrigeration pipeline 21 communicated with the outlet end of the condensation pipe 27 in the high-pressure low-temperature storage tank 131; the refrigeration pipeline 21 is sequentially provided with a refrigeration compressor 22, a refrigerant tank, a condenser 23, an evaporator 24 and a cooling fan.
Description of the working principle: when the starting system is started, the refrigeration branch 2 is firstly started, the refrigeration work of the refrigerated goods in the refrigerant tank is completed through the matching work of the refrigeration compressor 22, the condenser 23 and the evaporator 24, and then the refrigerated goods flow into the condensation pipe 27 through the refrigeration pipeline 21, so that the cooling work of the low-temperature pressure resistant tank 111 and the high-pressure low-temperature storage tank 131 is completed; the process requires that the temperature in the low-temperature resistant pressure tank 111 is between-15 ℃ and-30 ℃, and the temperature in the high-pressure low-temperature storage tank 131 is between-30 ℃ and-40 ℃; at this time, the SF6 gas with insufficient purity enters the low temperature resistant pressure tank 111 through the gas recovery branch 1 for reducing the pressure of the SF6 gas;
reducing the pressure of the high-pressure gas at the inlet to be within 15bar through the recovery first pressure reducer 12, reducing the pressure through the recovery particle filter 14 and the recovery second pressure reducer 16 to directly enter the recovery compressor 17 to be pressed into the low-temperature-resistant pressure tank 111, stopping the compressor from working when the maximum pressure reaches 40bar, and controlling the compressor by a first purification pressure sensor 113 of 0-60bar on the low-temperature-resistant pressure tank 111;
after the strong refrigeration, the SF6 gas is liquefied rapidly, and when the pressure in the low-temperature resistant pressure tank 111 reaches 38bar or the liquid level reaches 2/3, the gas recovery branch 1 stops working;
as the cryogenic pressure tank 111 continues to enter gas, the SF6 level in the cryogenic pressure tank 111 will rise, and two modes of operation will occur when the level reaches 2/3 as measured by the first purification level sensor 117:
1. the pressure in the low-temperature resistant pressure tank 111 is less than 38bar, the liquid level reaches 2/3 measured by the first purification liquid level sensor 117, and the work of the gas recovery branch 1 is closed;
2. when the pressure reaches 38bar and the liquid level does not reach 2/3, after the low-temperature resistant pressure tank 111 is kept still for 3 minutes outside the work of closing the gas recovery branch 1, the first purification electromagnetic valve 114 is opened, and the pressure in the low-temperature resistant pressure tank 111 is discharged into the buffer tank 121;
when the pressure in low-temperature resistant pressure tank 111 drops to 25-28 bar, closing first purification electromagnetic valve 114;
when the pressure in buffer tank 121 reaches 40bar, first purification solenoid valve 114 is closed;
after the mixed gas released from the low temperature resistant pressure tank 111 enters the buffer tank 121, the high-pressure mixed gas enters the high-pressure low temperature storage tank 131 through the buffer compressor 125;
when the pressure in the buffer tank 121 is less than 1bar, the buffer compressor 125 stops working, and the buffer electromagnetic valve 127 is closed;
when the pressure in high-pressure cryogenic storage tank 131 is greater than 45bar, buffer compressor 125 stops working;
when the pressure in low-temperature resistant pressure tank 111 is lower than 28bar, the liquid level is lower than 2/3 measured by first purification liquid level sensor 117, and the pressure in high-pressure low-temperature storage tank 131 is higher than 45bar, opening a pressure release valve to release the pressure in high-pressure low-temperature storage tank 131 to 25bar-35bar, and allowing discharged gas to enter low-temperature resistant pressure tank 111 through a recovery pipeline during pressure release;
when the pressure in the low-temperature resistant pressure tank 111 is higher than 38bar, or the liquid level is higher than 2/3 measured by the first purification liquid level sensor 117, closing the pressure relief valve;
after the pressure relief valve releases the pressure in high-pressure cryogenic storage tank 131, when the pressure in high-pressure cryogenic storage tank 131 is still higher than 38bar, opening evacuation solenoid valve 43 to complete the release of the pressure in high-pressure cryogenic storage tank 131, and when the pressure in high-pressure cryogenic storage tank 131 is 35bar, closing evacuation solenoid valve 43;
if manual deflation is selected to enter the waste gas cylinder, the emptying manual ball valve 44 is manually opened until the emptying pressure sensor 42 indicates that the pressure in the high-pressure cryogenic storage tank 131 is 35bar, and the emptying manual ball valve 44 is closed;
the steps can be synchronously carried out;
after the above operation, the condition is satisfied:
1. the pressure in the low-temperature resistant pressure tank 111 is lower than 28bar, and the liquid level is lower than 2/3;
2. pressure in high-pressure cryogenic storage tank 131 is less than 38 bar;
optionally, the gas recovery branch 1 is opened until the liquid level in the low temperature resistant pressure tank 111 reaches 2/3 measured by the first purification liquid level sensor 117, and then the liquid pump 52 is started to pump the liquid into the container;
directly selecting liquid pumping, and automatically pumping the liquid by the liquid pump 52 until the liquid levels of the low-temperature pressure resistant tank 111 and the high-pressure low-temperature storage tank 131 reach the 1/10 position measured by the first purification liquid level sensor 117 and the second purification liquid level sensor 134; after a part of the gas is treated, repeating the working process;
when the system purification needs to be stopped, the following operations are sequentially executed before the purification work is finished (gas is not recovered any more):
1. and finishing the click purification work.
2. And clicking to manually pour liquid.
3. Closing the refrigeration branch 2
4. The evacuation manual ball valve 44 is opened to release the pressure of the high pressure cryogenic storage tank 131 into the waste gas tank or cylinder, and if there is no other vessel, the high pressure cryogenic storage tank 131 can be optionally vented to atmosphere (after treatment) until the pressure in the high pressure cryogenic storage tank 131 is below 10bar
5. Slowly opening the first buffering manual ball valve, the second buffering manual ball valve and the third buffering manual ball valve, observing the low-temperature-resistant pressure tank 111, the buffer tank 121 and the high-pressure low-temperature storage tank 131, finishing the operation when the pressure of the low-temperature-resistant pressure tank 111, the pressure of the buffer tank 121 and the pressure of the high-pressure low-temperature storage tank 131 are less than 20bar, disconnecting the power supply, and when starting equipment next time, firstly closing the first buffering manual ball valve, the second buffering manual ball valve and the third buffering manual ball valve and then performing starting action.
It is to be noted that the respective specific technical features described in the above-described embodiments may be combined in any suitable manner without contradiction. The invention is not described in detail in order to avoid unnecessary repetition.
Claims (10)
1. A gas purification system for an SF6 gas station, comprising:
the refrigeration branch is used for reducing the set temperature in the purification tank;
the gas recovery branch is used for filtering water and particle impurities in SF6 gas in the gas station and pressing the processed SF6 gas into the first purification unit and the second purification unit;
and the purification buffer branch is used for completing purification of the processed SF6 gas, and pressurizing and forcibly cooling the gaseous mixed gas released from the first purification unit and the mixed gas into the second purification unit for further pressurization.
2. The gas purification system for the SF6 gas station of claim 1, wherein the gas recovery branch comprises a gas recovery pipeline, and a recovery self-sealing joint, a recovery first pressure reducer, a recovery moisture filter, a recovery particle filter, a recovery first solenoid valve, a recovery second pressure reducer, a recovery compressor, a recovery second solenoid valve sequentially mounted on the gas recovery pipeline;
the recovery compressor is an oil-free compressor.
3. The SF6 gas station gas purification system of claim 1, wherein the purification buffer circuit comprises a first purification unit in communication with a gas recovery conduit, a buffer unit in communication with the first purification unit, and a second purification unit in communication with the buffer unit.
4. The gas purification system for an SF6 gas station of claim 3, wherein the first purification unit comprises a low temperature pressure resistant tank in communication with the gas recovery conduit, a first purification conduit in communication with the low temperature pressure tank, and a first purification pressure sensor, a first purification solenoid valve, sequentially mounted on the first purification conduit;
and a first purification pressure gauge, a first purification safety valve, a first purification liquid level sensor and a first purification liquid observation mirror are arranged on the low-temperature pressure tank.
5. The SF6 gas station gas purification system of claim 3, wherein the buffer unit includes a buffer tank in communication with the first purification conduit, a buffer conduit in communication with the buffer tank, and a buffer pressure sensor, a buffer pressure reducer, a buffer compressor, a buffer particulate filter, a buffer solenoid valve sequentially mounted on the buffer conduit;
a buffer pressure gauge and a buffer safety valve are arranged on the buffer tank;
the buffer compressor is an oil-free compressor.
6. The gas purification system for an SF6 gas station of claim 3, wherein the second purification unit comprises a high pressure cryogenic storage tank in communication with a buffer tube, an evacuation unit and a pressure relief unit in communication with the high pressure cryogenic storage tank;
and a second purification pressure gauge, a second purification safety valve, a second purification liquid level sensor and a second purification liquid level observation mirror are arranged on the high-pressure low-temperature storage tank.
7. The gas purification system for an SF6 gas station of claim 6, wherein said evacuation unit includes an evacuation pipe in communication with said high pressure cryogenic storage tank, and an evacuation pressure sensor, an evacuation solenoid valve, an evacuation manual ball valve, mounted in said evacuation pipe in sequence;
the pressure relief unit comprises a pressure relief pipeline communicated with the high-pressure cryogenic storage tank and the gas recovery pipeline;
and a pressure relief valve is arranged on the pressure relief pipeline.
8. The gas purification system for an SF6 gas station according to claim 1, wherein a liquid pumping unit is connected to a lower portion of the purification buffer branch;
the liquid pumping unit comprises a liquid pumping pipeline which is respectively communicated with the low-temperature-resistant pressure tank, the buffer tank and the high-pressure low-temperature storage tank;
and the liquid pumping pipeline is provided with a liquid pump and a liquid pumping self-sealing joint.
9. The gas purification system for the SF6 gas station of claim 1, wherein the refrigeration branch comprises a refrigeration pipeline, and a condenser tube, an expansion valve and a temperature sensor in communication with the refrigeration pipeline and installed in the low temperature pressure resistant tank and the high pressure low temperature storage tank, respectively;
a first refrigeration electromagnetic valve is arranged on the communication part of the refrigeration pipeline and the outlet end of the condensation pipe in the low-temperature resistant pressure tank;
a second refrigeration electromagnetic valve is arranged on the communication part of the refrigeration pipeline and the outlet end of the condensation pipe in the high-pressure low-temperature storage tank;
and the refrigerating pipeline is sequentially provided with a refrigerating compressor, a condenser and an evaporator.
10. A purification method of a gas purification system for an SF6 gas station is characterized by comprising the following steps:
s1, starting a refrigeration branch, wherein the temperature in the low-temperature-resistant pressure tank is required to be-15 to-30 ℃, and the temperature in the high-pressure low-temperature storage tank is required to be-30 to-40 ℃;
s2, decompressing the SF6 gas with insufficient purity through a gas recovery branch circuit, and allowing the SF6 gas to enter a low-temperature-resistant pressure tank;
after the strong refrigeration, SF6 gas is liquefied rapidly, and when the pressure in the low-temperature resistant pressure tank reaches 38bar or the liquid level reaches 2/3, the gas recovery branch stops working;
in the processes of S3 and S2, when the low-temperature-resistant pressure tank continuously enters gas, the liquid level of SF6 in the low-temperature-resistant pressure tank rises, and when the liquid level reaches a position 2/3 measured by the first purification liquid level sensor, two working modes are carried out:
1. when the pressure in the low-temperature resistant pressure tank is less than 38bar, the liquid level reaches 2/3 measured by the first purification liquid level sensor, and the work of the gas recovery branch is closed;
2. when the pressure reaches 38bar and the liquid level does not reach 2/3, the low-temperature resistant pressure tank is kept still for 3 minutes outside the work of closing the gas recovery branch, and then a first purification electromagnetic valve is opened to discharge the pressure in the low-temperature resistant pressure tank into a buffer tank;
when the pressure in the low-temperature resistant pressure tank is reduced to 25-28 bar, closing the first purification electromagnetic valve;
when the pressure of the buffer tank reaches 40bar, closing the first purification electromagnetic valve;
S4A, after the mixed gas released from the low-temperature-resistant pressure tank enters the buffer tank, the high-pressure mixed gas enters the high-pressure low-temperature storage tank through the buffer compressor;
when the pressure in the buffer tank is less than 1bar, the buffer compressor stops working, and the buffer electromagnetic valve is closed;
when the pressure in the high-pressure cryogenic storage tank is greater than 45bar, stopping the buffer compressor;
S4B, when the pressure in the low-temperature-resistant pressure tank is lower than 28bar, the liquid level is lower than 2/3 measured by the first purification liquid level sensor, and the pressure in the high-pressure low-temperature storage tank is higher than 45bar, opening a pressure release valve, releasing the pressure in the high-pressure low-temperature storage tank to 25-35 bar, and allowing discharged gas during pressure release to enter the low-temperature-resistant pressure tank through a recovery pipeline;
when the pressure in the low-temperature resistant pressure tank is higher than 38bar, or the liquid level is higher than 2/3 measured by the first purification liquid level sensor, closing the pressure relief valve;
after the pressure relief valve releases the pressure of the high-pressure low-temperature storage tank, when the pressure in the high-pressure low-temperature storage tank is still higher than 38bar, the evacuation electromagnetic valve is opened to complete the release of the pressure in the high-pressure low-temperature storage tank, and when the pressure in the high-pressure low-temperature storage tank is 35bar, the evacuation electromagnetic valve is closed;
if manual deflation is selected to enter the waste gas cylinder, manually opening an emptying manual ball valve until an emptying pressure sensor indicates that the pressure in the high-pressure low-temperature storage tank is 35bar, and closing the emptying manual ball valve;
S4A, S4B, synchronous operation is carried out;
s5, under the operation of S4A, S4B, the condition
1. The pressure in the low-temperature resistant pressure tank is lower than 28bar, and the liquid level is lower than 2/3;
2. the pressure in the high-pressure cryogenic storage tank is lower than 38 bar;
s51, the gas recovery branch can be selectively opened until the liquid level in the low-temperature-resistant pressure tank reaches 2/3 measured by the first purification liquid level sensor, and then a liquid pump is started to pump liquid into a container;
and S52, directly selecting to pump liquid, and automatically pumping the liquid by the liquid pump until the liquid levels of the low-temperature-resistant pressure tank and the high-pressure low-temperature storage tank reach the 1/10 positions measured by the first purification liquid level sensor and the second purification liquid level sensor.
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Application publication date: 20210907 |