Gas separation device

Abstract

The utility model relates to a gas separation device, and relates to the field of gas recovery technology, the gas separation device comprises a waste gas storage bin, the waste gas storage bin is communicated with a waste gas recovery pipeline, the gas inlet end of the waste gas recovery pipeline is communicated with the gas outlet end of a container filled with waste gas, and the waste gas recovery pipeline is provided with a first gas pump; the waste gas storage bin is communicated with a waste gas treatment pipeline, the gas outlet end of the waste gas treatment pipeline is communicated with a membrane separator, the membrane separator is communicated with a first gas outlet pipeline and a second gas outlet pipeline, the second gas outlet pipeline is communicated with a sulfur hexafluoride storage tank, and the first gas outlet pipeline is provided with a first valve; a second valve is mounted on the second gas outlet pipeline; a third valve is mounted on the waste gas treatment pipeline; a temperature compensation module and an air pressure compensation module are mounted on the waste gas treatment pipeline. According to the invention, the separation effect of nitrogen and sulfur hexafluoride can be guaranteed.

Description

Technical Field

[0001] This application relates to the field of gas recovery technology, and particularly to a gas separation device. Background Art

[0002] Sulfur hexafluoride (SF6) gas is widely used in the power industry due to its excellent insulation and arc extinguishing performance. However, sulfur hexafluoride has a significant greenhouse effect and is one of the six greenhouse gases prohibited from being emitted. Therefore, it needs to be strictly controlled during use. To meet the new international environmental protection requirements and reduce greenhouse gas emissions, power grid enterprises at home and abroad have begun to use SF6 / N2 mixed gas to replace pure sulfur hexafluoride insulating gas to reduce the consumption of sulfur hexafluoride gas.

[0003] In applications, when SF6 / N2 mixed gas electrical equipment is overhauled, disassembled or retired, the SF6 mixed gas in the equipment must be recovered and processed. After the mixed gas is recovered, the nitrogen and sulfur hexafluoride gases in the mixed gas are often separated by a membrane separator. The separated nitrogen is directly discharged into the atmosphere, and the sulfur hexafluoride is stored and then liquefied.

[0004] However, the separation efficiency of existing SF6 / N2 mixed gas recovery devices is greatly affected by conditions such as gas pressure and temperature on both sides of the polymer membrane. In a complex on-site working environment, fluctuations in the quality of the separated gas often occur, and even the phenomenon that the SF6 content in the tail gas exceeds the standard may occur. The SF6 content in the discharged tail gas (N2) cannot be determined, and it cannot be ensured that the discharged N2 meets the safety emission standards, endangering the safety of on-site personnel and affecting the atmospheric environment, and there is room for improvement. Utility Model Content

[0005] In order to reduce the influence of temperature and pressure on the separation of nitrogen and sulfur hexafluoride and ensure the separation effect of nitrogen and sulfur hexafluoride, this application provides a gas separation device.

[0006] The gas separation device provided by this application adopts the following technical solutions:

[0007] A gas separation device includes an exhaust gas storage bin. An exhaust gas recovery pipeline is communicatively connected to the exhaust gas storage bin. The intake end of the exhaust gas recovery pipeline is communicatively connected to the outlet end of a container filled with exhaust gas. A first air pump is installed on the exhaust gas recovery pipeline.

[0008] An exhaust gas treatment pipeline is connected to the exhaust gas storage bin. The outlet end of the exhaust gas treatment pipeline is connected to a membrane separator. A first outlet pipeline and a second outlet pipeline are connected to the membrane separator. The second outlet pipeline is connected to a sulfur hexafluoride storage tank. A first valve is installed on the first outlet pipeline, a second valve is installed on the second outlet pipeline, and a third valve and a second air pump are installed on the exhaust gas treatment pipeline.

[0009] A permeable membrane that limits the passage of sulfur hexafluoride gas is provided at the inlet end of the second outlet pipeline.

[0010] A temperature compensation module and a pressure compensation module are installed on the exhaust gas treatment pipeline.

[0011] By adopting the above technical solution, during exhaust gas recovery, the user can connect the exhaust gas recovery pipeline to a container filled with exhaust gas and turn on the first air pump to draw the exhaust gas into the exhaust gas storage bin. Subsequently, the operator starts the third valve and the second air pump. The second air pump extracts the exhaust gas in the exhaust gas storage bin and flows it through the exhaust gas treatment pipeline to the membrane separator. The separated nitrogen and sulfur hexafluoride gases flow out through the first outlet pipeline and the second outlet pipeline respectively, achieving the technical effect of separating the exhaust gas. Since a temperature compensation module and a pressure compensation module are provided on the exhaust gas treatment pipeline, the temperature and pressure of the exhaust gas can be effectively guaranteed to be suitable for separation by the membrane separator, ensuring the separation effect of the exhaust gas, reducing the adverse effects of environmental temperature changes and exhaust gas pressure on the separation effect, and ensuring the separation effect of nitrogen and sulfur hexafluoride gases.

[0012] Preferably, the temperature compensation module includes:

[0013] A temperature sensor is installed on the exhaust gas treatment pipeline to detect the exhaust gas temperature and output an exhaust gas temperature signal.

[0014] A first single-chip microcomputer is signal-connected to the signal output end of the temperature sensor, used to receive the exhaust gas temperature signal and output a heating control signal when the exhaust gas temperature is lower than the set temperature.

[0015] A pipeline heating mechanism is arranged outside the exhaust gas treatment pipeline and is signal-connected to the signal output end of the first single-chip microcomputer, used to receive the heating control signal and heat the exhaust gas.

[0016] By adopting the above technical solution, before the exhaust gas flows into the membrane separator, the temperature sensor detects the exhaust gas temperature. When the exhaust gas temperature is low, the first single-chip microcomputer controls the pipeline heating mechanism to heat the exhaust gas treatment pipeline, causing the exhaust gas temperature to rise.

[0017] Preferably, the pressure compensation module includes:

[0018] A pressure sensor is installed on the waste gas treatment pipeline for detecting the waste gas pressure and outputting a waste gas pressure signal;

[0019] A second single-chip microcomputer is signal-connected to the signal output end of the pressure sensor for receiving the waste gas pressure signal and outputting a supercharging control signal when the waste gas pressure is less than a set pressure value;

[0020] The signal input end of the second air pump is signal-connected to the signal output end of the second single-chip microcomputer, and the second air pump receives the supercharging control signal and increases the waste gas pressure.

[0021] By adopting the above technical solution, before the waste gas flows into the membrane separator, the temperature sensor detects the waste gas pressure, and when the waste gas pressure is too small, it controls the second air pump to supercharge the waste gas, further ensuring the separation effect of the membrane separator.

[0022] Preferably, the pipeline heating mechanism includes a sleeve and a water heater. The sleeve is located outside the waste gas treatment pipeline. A hot water circulation space is formed inside the sleeve, and a water inlet pipeline and a water outlet pipeline are communicatively arranged on the sleeve;

[0023] The water heater includes a water tank. The water inlet pipeline and the water outlet pipeline are both communicatively connected to the water tank, and a first water pump and a second water pump are respectively installed on the water inlet pipeline and the water outlet pipeline.

[0024] By adopting the above technical solution, the first water pump and the second water pump drive the hot water to circulate in the water tank and the sleeve, and can heat the waste gas in the waste gas treatment pipeline.

[0025] Preferably, a graphite heat dissipation film is fixedly installed on the inner wall of the sleeve, and the graphite heat dissipation film is located between the inner wall of the sleeve and the outer wall of the waste gas adsorption pipeline.

[0026] By adopting the above technical solution, the heat dissipation film can ensure the uniformity of heating the waste gas.

[0027] Preferably, a sulfur hexafluoride sensor is installed on the waste gas circulation pipeline, a first valve is installed on the first air outlet pipeline, a reflux pipeline is communicatively arranged between the first air outlet pipeline and the waste gas storage bin, and a fourth valve and a third air pump are installed on the reflux pipeline;

[0028] The signal output end of the sulfur hexafluoride sensor is signal-connected to a third single-chip microcomputer, and the third single-chip microcomputer controls the first valve to close and controls the fourth valve to communicate with the third air pump when the sulfur hexafluoride content in nitrogen exceeds the standard.

[0029] By adopting the above technical solution, through the mutual cooperation and use of the sulfur hexafluoride sensor, the third single-chip microcomputer, the reflux pipeline, the third air pump, and the fourth valve, when the separation of sulfur hexafluoride in nitrogen is incomplete, the gas in the first air outlet pipeline can be controlled to flow back into the waste gas storage bin for re-separation, which can further ensure the effect of waste gas separation.

[0030] In summary, a gas separation device of the present application includes at least one of the following beneficial technical effects:

[0031] 1. When recovering waste gas, the user can connect the waste gas recovery pipeline to the container filled with waste gas and turn on the first air pump to pump the waste gas into and store it in the waste gas storage bin. Subsequently, the operator starts the third valve and the second air pump. The second air pump extracts the waste gas in the waste gas storage bin and flows it through the waste gas treatment pipeline to the membrane separator. The separated nitrogen and sulfur hexafluoride gases flow out through the first air outlet pipeline and the second air outlet pipeline respectively, achieving the technical effect of separating waste gas. Since the waste gas treatment pipeline is provided with a temperature compensation module and a pressure compensation module, it can effectively ensure that the temperature and pressure of the waste gas are suitable for separation by the membrane separator, ensure the effect of waste gas separation, reduce the adverse effects of environmental temperature changes and waste gas pressure on the separation effect, and ensure the separation effect of nitrogen and sulfur hexafluoride gases;

[0032] 2. By the mutual cooperation and use of the sulfur hexafluoride sensor, the third single-chip microcomputer, the reflux pipeline, the third air pump, and the fourth valve, when the separation of sulfur hexafluoride in nitrogen is incomplete, the gas in the first air outlet pipeline can be controlled to flow back into the waste gas storage bin for re-separation, which can further ensure the effect of waste gas separation. Description of the Drawings

[0033] Figure 1 is a schematic diagram showing the overall structure of the separation device in an embodiment of the present application.

[0034] Figure 2 is a schematic diagram showing the overall structure of the temperature compensation module in an embodiment of the present application.

[0035] Description of the reference numerals: 1. Waste gas storage bin; 11. Waste gas recovery pipeline; 12. First air pump; 23. Waste gas treatment pipeline; 24. Third valve; 25. Second air pump; 3. Membrane separator; 31. First air outlet pipeline; 32. Second air outlet pipeline; 33. First valve; 34. Second valve; 35. Reflux pipeline; 36. Third air pump; 37. Fourth valve; 4. Sulfur hexafluoride storage tank; 5. Temperature compensation module; 51. Temperature sensor; 52. Sleeve; 53. Water heater; 54. Water inlet pipeline; 55. Water outlet pipeline; 56. First water pump; 57. Second water pump; 58. Graphite heat dissipation film; 6. Pressure compensation module; 7. Sulfur hexafluoride sensor. Detailed Embodiments

[0036] The following will further elaborate on this application in conjunction with the attached Figure 1 - Figure 2 drawings for a more detailed description.

[0037] Embodiment

[0038] An embodiment of this application discloses a gas separation device. Referring to Figure 1 , it includes an exhaust gas storage bin 1, an exhaust gas recovery pipeline 11 is communicatively connected to the exhaust gas storage bin 1, the intake end of the exhaust gas recovery pipeline 11 is communicatively connected to the outlet end of the container filled with exhaust gas, and a first air pump 12 is installed on the exhaust gas recovery pipeline 11.

[0039] An exhaust gas treatment pipeline 23 is communicatively connected to the exhaust gas storage bin 1, the outlet end of the exhaust gas treatment pipeline 23 is communicatively connected to a membrane separator 3, a first outlet pipeline 31 and a second outlet pipeline 32 are communicatively connected to the membrane separator 3, the second outlet pipeline 32 is communicatively connected to a sulfur hexafluoride storage tank 4, a first valve 33 is installed on the first outlet pipeline 31, a second valve 34 is installed on the second outlet pipeline 32, a third valve 24 and a second air pump 25 are installed on the exhaust gas treatment pipeline 23; a permeable membrane that limits the passage of sulfur hexafluoride gas is provided at the intake end of the second outlet pipeline 32; a temperature compensation module 5 and a pressure compensation module 6 are installed on the exhaust gas treatment pipeline 23.

[0040] During exhaust gas recovery, the user can connect the exhaust gas recovery pipeline 11 to the container filled with exhaust gas and turn on the first air pump 12 to pump the exhaust gas into and store it in the exhaust gas storage bin 1. Subsequently, the operator starts the third valve 24 and the second air pump 25, and the second air pump 25 pumps the exhaust gas in the exhaust gas storage bin 1 to flow through the exhaust gas treatment pipeline 23 to the membrane separator 3. The separated nitrogen and sulfur hexafluoride gases flow out through the first outlet pipeline 31 and the second outlet pipeline 32 respectively, achieving the technical effect of separating the exhaust gas. Since the temperature compensation module 5 and the pressure compensation module 6 are provided on the exhaust gas treatment pipeline 23, it can effectively ensure that the temperature and pressure of the exhaust gas are suitable for separation by the membrane separator 3, ensuring the separation effect of the exhaust gas, reducing the adverse effects of environmental temperature changes and exhaust gas pressure on the separation effect, and ensuring the separation effect of nitrogen and sulfur hexafluoride gases.

[0041] In the embodiment of this application, the temperature compensation module 5 includes: a temperature sensor 51, installed on the exhaust gas treatment pipeline 23, for detecting the exhaust gas temperature and outputting an exhaust gas temperature signal; a first single-chip microcomputer, signal-connected to the signal output end of the temperature sensor 51, for receiving the exhaust gas temperature signal and outputting a heating control signal when the exhaust gas temperature is lower than the set temperature; a pipeline heating mechanism, provided on the outside of the exhaust gas treatment pipeline 23, signal-connected to the signal output end of the first single-chip microcomputer, for receiving the heating control signal and heating the exhaust gas.

[0042] Before the waste gas flows into the membrane separator 3, the temperature sensor 51 detects the temperature of the waste gas. When the temperature of the waste gas is low, the first single-chip microcomputer controls the pipeline heating mechanism to heat the waste gas treatment pipeline 23, so that the temperature of the waste gas rises.

[0043] In the embodiment of the present application, the air pressure compensation module 6 includes: an air pressure sensor installed on the waste gas treatment pipeline 23 for detecting the waste gas pressure and outputting a waste gas pressure signal; a second single-chip microcomputer signal-connected to the signal output end of the air pressure sensor for receiving the waste gas pressure signal and outputting a supercharging control signal when the waste gas pressure is less than the set pressure value; the signal input end of the second air pump 25 is signal-connected to the signal output end of the second single-chip microcomputer, and the second air pump 25 receives the supercharging control signal and increases the waste gas pressure.

[0044] Before the waste gas flows into the membrane separator 3, the temperature sensor 51 detects the waste gas pressure, and when the waste gas pressure is too small, it controls the second air pump 25 to supercharge the waste gas, further ensuring the separation effect of the membrane separator 3.

[0045] In the embodiment of the present application, the pipeline heating mechanism includes a sleeve 52 and a water heater 53. The sleeve 52 is located outside the waste gas treatment pipeline 23. A hot water circulation space is formed in the sleeve 52, and a water inlet pipeline 54 and a water outlet pipeline 55 are communicated and arranged on the sleeve 52.

[0046] The water heater 53 includes a water tank. The water inlet pipeline 54 and the water outlet pipeline 55 are both communicated with the water tank, and a first water pump 56 and a second water pump 57 are respectively installed on the water inlet pipeline 54 and the water outlet pipeline 55. The first water pump 56 and the second water pump 57 drive the hot water to circulate in the water tank and the sleeve 52, and can heat the waste gas in the waste gas treatment pipeline 23.

[0047] Refer to Figure 2 , a graphite heat dissipation film 58 is fixedly installed on the inner wall of the sleeve 52. The graphite heat dissipation film 58 is located between the inner wall of the sleeve 52 and the outer wall of the waste gas adsorption pipeline. The graphite heat dissipation film 58 can ensure the uniformity of heating the waste gas.

[0048] Refer to Figure 1 , a sulfur hexafluoride sensor 7 is installed on the waste gas circulation pipeline, a first valve 33 is installed on the first air outlet pipeline 31, a reflux pipeline 35 is communicated and arranged between the first air outlet pipeline 31 and the waste gas storage bin 1, and a fourth valve 37 and a third air pump 36 are installed on the reflux pipeline 35.

[0049] The signal output end of the sulfur hexafluoride sensor 7 is signal-connected to a third single-chip microcomputer. When the sulfur hexafluoride content in nitrogen exceeds the standard, the third single-chip microcomputer controls the first valve 33 to close and controls the fourth valve 37 to communicate with the third air pump 36.

[0050] Through the mutual cooperation and use of the sulfur hexafluoride sensor 7, the third single-chip microcomputer, the reflux pipeline 35, the third air pump 36, and the fourth valve 37, when the separation of sulfur hexafluoride in nitrogen is incomplete, the gas in the first outlet pipeline 31 can be controlled to flow back into the waste gas storage bin 1 for re-separation, which can further ensure the effect of waste gas separation.

[0051] The implementation principle of a gas separation device according to an embodiment of the present application is as follows: When recovering waste gas, the user can connect through the waste gas recovery pipeline 11 to a container filled with waste gas, and turn on the first air pump 12 to pump the waste gas into and store it in the waste gas storage bin 1. Subsequently, the operator starts the third valve 24 and the second air pump 25. The second air pump 25 extracts the waste gas in the waste gas storage bin 1 and flows it through the waste gas treatment pipeline 23 to the membrane separator 3. The separated nitrogen and sulfur hexafluoride gases flow out through the first outlet pipeline 31 and the second outlet pipeline 32 respectively, achieving the technical effect of separating waste gas. Since the waste gas treatment pipeline 23 is provided with a temperature compensation module 5 and a pressure compensation module 6, it can effectively ensure that the temperature and pressure of the waste gas are suitable for separation by the membrane separator 3, ensure the effect of waste gas separation, reduce the adverse effects of environmental temperature changes and waste gas pressure on the separation effect, and ensure the separation effect of nitrogen and sulfur hexafluoride gases.

[0052] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited accordingly. Therefore, all equivalent changes made according to the structure, shape, and principle of the present application should be covered within the protection scope of the present application.

Claims

1. A gas separation device, characterized in that: The invention comprises a waste gas storage bin (1), wherein a waste gas recovery pipe (11) is connected to the waste gas storage bin (1), an air inlet end of the waste gas recovery pipe (11) is connected to an air outlet end of a container containing waste gas, and a first air pump (12) is installed on the waste gas recovery pipe (11); The waste gas storage bin (1) is connected to a waste gas treatment pipeline (23), the outlet end of the waste gas treatment pipeline (23) is connected to a membrane separator (3), the membrane separator (3) is connected to a first outlet pipeline (31) and a second outlet pipeline (32), the second outlet pipeline (32) is connected to a sulfur hexafluoride storage tank (4), the first outlet pipeline (31) is installed with a first valve (33), the second outlet pipeline (32) is installed with a second valve (34), and the waste gas treatment pipeline (23) is installed with a third valve (24) and a second air pump (25); A permeable membrane is provided at the gas inlet end of the second gas outlet pipe (32) to limit the passage of sulfur hexafluoride gas; The waste gas treatment pipeline (23) is installed with a temperature compensation module (5) and an air pressure compensation module (6).

2. A gas separation device according to claim 1, characterized in that: The temperature compensation module (5) comprises: A temperature sensor (51) is installed on the exhaust gas treatment pipeline (23) and is used to detect the exhaust gas temperature and output an exhaust gas temperature signal; A first single chip computer is signal-connected to a signal output terminal of the temperature sensor (51), and is used to receive the exhaust gas temperature signal and output a heating control signal when the exhaust gas temperature is lower than a set temperature; The pipeline heating mechanism is arranged on the outside of the exhaust gas treatment pipeline (23), is signal-connected to the signal output terminal of the first single-chip computer, and is used to receive the heating control signal and heat the exhaust gas.

3. A gas separation device according to claim 2, characterized in that: The air pressure compensation module (6) comprises: An air pressure sensor installed on the exhaust gas treatment pipeline (23) and used for detecting the exhaust gas pressure and outputting an exhaust gas pressure signal; A second single chip microcomputer is connected to the signal output terminal of the air pressure sensor, and is used to receive the exhaust gas pressure signal and output a boost control signal when the exhaust gas pressure is less than a set pressure value; The signal input end of the second air pump (25) is signal-connected to the signal output end of the second single-chip computer, and the second air pump (25) receives the boost control signal and increases the exhaust gas pressure.

4. A gas separation device according to claim 3, characterized in that: The pipeline heating mechanism comprises a sleeve (52) and a water heater (53); the sleeve (52) is located outside the exhaust gas treatment pipeline (23); a hot water circulation space is formed inside the sleeve (52); and a water inlet pipeline (54) and a water outlet pipeline (55) are connected and arranged on the sleeve (52); The water heater (53) comprises a water tank, the water inlet pipe (54) and the water outlet pipe (55) are both connected to the water tank, and a first water pump (56) and a second water pump (57) are respectively installed on the water inlet pipe (54) and the water outlet pipe (55).

5. A gas separation device according to claim 4, characterized in that: A graphite heat-spreading film (58) is fixedly mounted on the inner wall of the sleeve (52), and the graphite heat-spreading film (58) is located between the inner wall of the sleeve (52) and the outer wall of the exhaust gas adsorption pipe.

6. A gas separation device according to claim 5, characterized in that: A sulfur hexafluoride sensor (7) is installed on the exhaust gas circulation pipeline, a first valve (33) is installed on the first outlet pipeline (31), a return pipeline (35) is provided between the first outlet pipeline (31) and the exhaust gas storage bin (1), and a fourth valve (37) and a third air pump (36) are installed on the return pipeline (35); The signal output end of the sulfur hexafluoride sensor (7) is signal-connected to a third single-chip microcomputer, and when the sulfur hexafluoride content in the nitrogen exceeds the standard, the third single-chip microcomputer controls the first valve (33) to be closed and controls the fourth valve (37) to be connected to the third air pump (36).

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