CN219272601U - Mixed gas separation device - Google Patents

Abstract

The utility model belongs to the technical field of mixed gas separation, in particular to a mixed gas separation device which comprises an air inlet device, a separation device, a first recovery device and a second recovery device; the air inlet device is externally connected with an external air source and the separation device through a pipeline, the separation device comprises a separation container, a heating device and a refrigerating device, and the first recovery device and the second recovery device are respectively connected with the separation device through pipelines; because the low-temperature solidification separation treatment mode is adopted, the built-in separation container, the heating device, the refrigerating device and the like are not easy to damage relative to conventional filtration, the requirements on the parameters of the separation process are low, the ratio of mixed gas is not excessively high, the universality of the equipment is high, the separation purity is high, and a manually-controlled regulating valve is not required to be additionally arranged in one-key operation.

Description

Mixed gas separation device

Technical Field

The utility model belongs to the technical field of mixed gas separation, and particularly relates to a mixed gas separation device.

Background

With the requirements of domestic strengthening on environmental protection work and increasing the emission control force on greenhouse gases, sulfur hexafluoride is an artificial synthetic gas and has quite stable chemical properties, so that the sulfur hexafluoride is very difficult to react with other substances after being emitted into the atmosphere, and has quite long life cycle in the atmosphere, and the long-term accumulation leads to huge greenhouse effect.

Meanwhile, the high-voltage switch of the mixed gas of nitrogen and sulfur hexafluoride commonly used in the domestic high-cold low-temperature areas also needs to be used for purifying and recycling the mixed gas of nitrogen and sulfur hexafluoride which does not meet the operation standard.

In order to solve the above technical problems, it is proposed in the prior art to use a multi-stage module for separation, but the multi-stage module for separation has the following problems:

1. the flow must be stable and must not be more than 10 cubic meters per hour, then a high-grade flowmeter must be used for controlling, the flowmeter is affected by vibration of equipment, environmental temperature, gas source pressure and the like, when the product is recovered, the internal pressure is lower and lower, the flowmeter is required to adjust the opening degree in real time, so that stable control is very difficult, and unstable flow can lead to unstable purity of sulfur hexafluoride at an outlet, higher sulfur hexafluoride content at a nitrogen exhaust port and even damage of a module.

2. The pressure stability is difficult to control, the exhaust pressure of the compressor fluctuates under the condition that the pressure of the inlet of the module and the pressure of the outlet of the sulfur hexafluoride are 1.4Mpa, the pressure stability is difficult to control, a manually-controlled regulating valve is additionally arranged for controlling the internal pressure of the module in a manual mode, the operation is very complicated, and the module is easy to damage if the pressure control is poor.

3. The equipment has no universality, can only recycle mixed gas, can not recycle pure gas, can only recycle sulfur hexafluoride mixed gas with specified proportion, and has higher cost if stable sulfur hexafluoride outlet high purity is to be achieved, and the later stage is to be refrigerated at low temperature.

For this purpose, the patent provides a mixed gas separation device.

Disclosure of Invention

In order to overcome the defects in the prior art, the problems that in the prior art, the purity of the mixed gas separation of different freezing points is low, and the mixed gas has to have stable flow, pressure and temperature in the separation process are solved.

The technical scheme that this patent adopted to solve its technical problem is: the utility model relates to a mixed gas separation device, which comprises an air inlet device, a separation device, a first recovery device and a second recovery device;

the air inlet device is externally connected with an external air source and the separation device through a pipeline, and mixed gas with different solidifying points is conveyed into the separation device through the air inlet device;

the separation device comprises a separation container, a heating device and a refrigerating device, wherein the heating device and the refrigerating device are respectively connected with the separation container so as to heat or refrigerate the mixed gas in the separation container;

the first recovery device and the second recovery device are respectively connected with the separation device through pipelines;

the separation device is used for refrigerating the mixed gas to form a mixture of solid and gas, and the gas after being refrigerated in the separation device is conveyed to the first recovery device; the solid is heated by the heating device to be liquid and is conveyed to the second recovery device for recovery.

In some embodiments of the present utility model, in some embodiments,

the separation device is used for separating sulfur hexafluoride and nitrogen.

In some embodiments of the present utility model, in some embodiments,

the air inlet device comprises a cache container; the buffer container is connected with the separation device through a pipeline and is used for buffering and filtering the mixed gas;

and a first control valve is arranged on a pipeline connected between the buffer container and the separation device.

In some embodiments of the present utility model, in some embodiments,

the air inlet device further comprises a compressor; the compressor is connected with the cache container through a pipeline; and a second control valve is connected between the buffer container and the compressor.

In some embodiments of the present utility model, in some embodiments,

the air inlet device further comprises an air pressure stabilizing unit, the air pressure stabilizing unit is connected with the compressor through a pipeline, and the air pressure stabilizing unit is used for adjusting the air pressure of the air source to a preset pressure and then conveying the air source to the compressor; the air pressure stabilizing unit is connected with an air inlet pipeline which is used for connecting an external air source;

the air pressure stabilizing unit comprises a first bypass pipeline, and a pressure reducer is arranged on the first bypass pipeline;

the air pressure stabilizing unit further comprises a second bypass pipeline, the first bypass pipeline and the second bypass pipeline are arranged in parallel, and a vacuum compressor is arranged on the second bypass pipeline;

a third control valve is arranged on the second bypass pipeline;

and a fourth control valve is arranged on the first bypass pipeline or the air inlet pipeline.

In some embodiments of the present utility model, in some embodiments,

the second recovery device comprises a liquid pump and a storage device; the liquid pump is used for connecting the separation container with the storage device through a pipeline;

a fifth control valve is connected between the liquid pump and the separation container.

In some embodiments of the present utility model, in some embodiments,

a control unit is also connected between the liquid pump and the storage device through a pipeline; the control unit is used for sampling sulfur hexafluoride led out by the liquid pump;

the control unit comprises a third bypass pipeline, and a sixth control valve is arranged on the third bypass pipeline

The control unit comprises a fourth bypass pipeline, the fourth bypass pipeline is arranged in parallel with the third bypass pipeline, and the fourth bypass pipeline is sequentially connected with a seventh control valve, an inflation pressure reducer, a port and an eighth control valve.

In some embodiments of the present utility model, in some embodiments,

the first recovery device comprises an adsorption device; the adsorption device is connected with the separation device through a pipeline and is used for filtering the gas led out of the separation device;

a tenth control valve is connected between the adsorption device and the separation device.

In some embodiments of the present utility model, in some embodiments,

a sixteenth control valve is further arranged between the tenth control valve and the separation device, a fifth bypass pipeline is further arranged between the tenth control valve and the sixteenth control valve, a ninth control valve and a vacuum pump are arranged on the fifth bypass pipeline, and the vacuum pump is arranged at the tail end of the fifth bypass pipeline.

In some embodiments of the present utility model, in some embodiments,

a sixth bypass pipeline is connected between the first recovery device and the cache container; an eleventh control valve is connected to the sixth bypass pipeline;

a seventh bypass pipeline is arranged between the fourth control valve and the port of the air inlet pipeline, the seventh bypass pipeline is communicated with the vacuum pump, and a fourteenth control valve is arranged on the seventh bypass pipeline; a fifteenth control valve and a vacuum gauge are connected between the fourteenth control valve and the inlet pipeline port;

a pipeline between the control unit and the storage device is communicated with the air inlet pipeline, and a twelfth control valve is arranged between the communication part and the storage device;

the sixth bypass pipeline is communicated with the storage device through an eighth bypass pipeline, and a thirteenth control valve is arranged on the eighth bypass pipeline.

The beneficial effects of the utility model are as follows:

1. the utility model provides a mixed gas separating device, which is characterized in that a separating container, a heating device and a refrigerating device are arranged to carry out low-temperature solidification and separation treatment on mixed gas entering the separating container, so that the gas with relatively high solidifying point temperature is solidified, and the gas with relatively high solidifying point temperature is separated, and the purity of the separated gas is at least 99.9% due to the low-temperature solidification method, and the separating container, the heating device, the refrigerating device and the like are not easy to damage, so that the requirements on flow rate, pressure and temperature of a gas source of the mixed gas are not so high.

2. The utility model provides a mixed gas separating device, which is characterized in that a vacuum pump is arranged in the separating device and is connected with an adsorption device and a buffer container, the vacuum pump can pump residual gas in a pipeline of the separating device, and can reversely pump the adsorption device and the buffer container at the same time, so that sulfur hexafluoride captured in an adsorption module can be timely desorbed, impurities filtered by the buffer container can be cleaned, the problem of corrosion of residual gas in the separating device to the pipeline can be avoided when the separating device is not used, and long-term normal use of the adsorption module and the buffer container can be ensured after the adsorption module and the buffer container are cleaned.

Drawings

The utility model is further described below with reference to the accompanying drawings.

Fig. 1 is a simplified diagram of the constituent modules of the present utility model.

Fig. 2 is a schematic diagram of the constituent modules of the present utility model.

FIG. 3 is a schematic view of a separation device of the present utility model.

Fig. 4 is a schematic view of an air intake device of the present utility model.

Fig. 5 is a schematic view of a second recovery device of the present utility model.

Fig. 6 is a schematic view of a first recovery apparatus of the present utility model.

Fig. 7 is a schematic view of the vacuum connection of the present utility model.

In the figure: an air intake device 1, a separation device 2, a first recovery device 3, a second recovery device 4, a separation vessel 5, a heating device 6, a refrigeration device 7, a buffer vessel 8, a first control valve 9, a compressor 10, a second control valve 11, an air pressure stabilizing unit 12, an air intake pipe 13, a first bypass pipe 14, a pressure reducer 15, a second bypass pipe 16, a vacuum compressor 17, a third control valve 18, a fourth control valve 19, a liquid pump 20, a storage device 21, a fifth control valve 22, a control unit 23, a third bypass pipe 24, a sixth control valve 25, a fourth bypass pipe 26, a seventh control valve 27, an air charge pressure reducer 28, a port 29, an eighth control valve 30, an adsorption device 31, a tenth control valve 32, a sixteenth control valve 33, a fifth bypass pipe 34, a ninth control valve 35, a vacuum pump 36, a sixth bypass pipe 37, an eleventh control valve 38, a seventh bypass pipe 39, a fourteenth control valve 40, a fifteenth control valve 41, a vacuum gauge 42, a twelfth control valve 43, an eighth bypass pipe 44, a thirteenth control valve 45.

Detailed Description

For the purposes of promoting an understanding of the principles of the present patent, reference will now be made to the embodiments illustrated and specific language will be used to describe the same. It will nevertheless be understood that no limitation of the scope of the patent is thereby intended, such alterations, modifications, and further applications of the principles as illustrated being contemplated as would normally occur to one skilled in the art to which the patent relates.

As shown in fig. 1 to 7, the present embodiment provides a mixed gas separating apparatus comprising an air inlet apparatus 1, a separating apparatus 2, a first recovery apparatus 3, and a second recovery apparatus 4; the air inlet device 1 is externally connected with an external air source and the separation device 2 through a pipeline, the air inlet device 1 conveys air at the air source to the separation device 2, and the separation device 2 separates the mixed air to obtain target air, and the separation method can improve the purity of the target air, wherein the air of the air source is the mixed air with different solidifying points;

the separation device 2 comprises a separation container 5, a heating device 6 and a refrigerating device 7, wherein the heating device 6 and the refrigerating device 7 are respectively connected with the separation container 5 to heat or refrigerate the mixed gas in the separation container 5;

the first recovery device 3 and the second recovery device 4 are respectively connected with the separation device 2 through pipelines; the separated target gas is recovered by the first recovery device 3 or the second recovery device 4, the non-target gas is recovered by the second recovery device 4 or the first recovery device 3, the separation device 2 uses the difference of the solidifying points among the gases to separate, the target gas can be solidified, and the non-target gas is in a gas state so as to discharge the non-target gas, and then the target gas in a solid state in the separation device 2 is heated to be in a liquid state or a gas state for recovery; or solidifying the non-target gas, the target gas being in a gaseous state to separate the target gas from the non-target gas. Through the physical property of the solidifying point, the target gas and the non-target gas can be separated efficiently, so that the purity of the separated target gas can be improved;

most of the prior art is conventional filtration for the separation mode of the mixed gas, the separation efficiency is lower, the purity of the separated gas is lower, and although the multi-stage module is also adopted for separating the mixed gas, the requirement on process parameters is higher in the process of separating the mixed gas, such as: the flow must be stable, the pressure stability is difficult to control, and the equipment has no problems such as commonality.

As shown in fig. 1-3, the present application proposes a way of performing a low-temperature separation treatment on a mixed gas, in a use process, by introducing the mixed gas into a separation container 5 of a separation device 2 through an air inlet device 1, since the separation container 5 is connected with a refrigerating device 7 and a heating device 6, firstly, the mixed gas newly introduced into the separation container 5 is subjected to a cooling treatment through the refrigerating device 7, and by using different characteristics of solidifying points of different gases in the mixed gas, solidification of the gas with a relatively high solidifying point temperature is achieved, the gas with a relatively high solidifying point temperature is separated, the separated gas is introduced into a first recovery device 3 for recovery, discharge or other treatment, and a solidified substance located in the separation container 5 is subjected to a heating treatment by the heating device 6, so that the solidified substance is changed into a liquid or a gas again, and is introduced into the interior of a second recovery device 4 for recovery, discharge or other treatment.

Because the low-temperature solidification separation treatment mode is adopted, the built-in separation container 5, the heating device 6, the refrigerating device 7 and the like are not easy to damage relative to conventional filtration, the requirements on the parameters of the separation process are low, the ratio of mixed gas is not excessively high, the universality of the equipment is high, the separation purity is high, and a manually-controlled regulating valve is not required to be additionally arranged in one-key operation.

Of course, in practical implementation, if the mixed gas is composed of a plurality of gases with different freezing points, the gases with different freezing points can be separated successively according to the different freezing points until the target gas is separated. The setting of the recovery device can be increased or adjusted according to the composition of the mixed gas and the difference of the solidifying point.

In a specific embodiment, the mixed gas is sulfur hexafluoride and nitrogen, the sulfur hexafluoride has a lower solidification point relative to the nitrogen, at a temperature lower than or equal to the solidification point of sulfur hexafluoride, at this time, sulfur hexafluoride is in a solid state, the nitrogen is in a gaseous state, the sulfur hexafluoride in the mixed gas is solidified by the separation container 5, and the nitrogen treated at a low temperature is still introduced into the first recovery device 3 in a gaseous state for recovering, discharging or performing other treatments of the nitrogen due to the lower solidification point temperature of the nitrogen, the solidified sulfur hexafluoride is heated by the heating device 6, and the heated sulfur hexafluoride liquid is conveyed to the second recovery device 4 for recovering, utilizing or performing other treatments of the sulfur hexafluoride.

As shown in fig. 4, in some embodiments, the air intake device 1 includes a buffer container 8; the air outlet end of the buffer container 8 is connected with the separation device 2 through a pipeline, the air inlet end of the buffer container 8 is used for externally connecting an air source, a first control valve 9 is arranged on the pipeline connected between the buffer container 8 and the separation device 2, after the mixed gas is led into the air inlet device 1, the mixed gas can enter the buffer container 8, if the first control valve 9 is in an open state, the mixed gas can be continuously led into the separation device 2, if the first control valve 9 is closed, the mixed gas can stop to be continuously led into the separation device 2, and part of the mixed gas can be buffered by the buffer container 8 at the moment, the buffer and pressure stabilizing effects are achieved, the inside of the buffer container 8 can also comprise a structure or a filter for filtering, such as: the filter screen can pretreat other substances in the mixed gas, such as water, particles or floccules, so as to ensure that the mixed gas introduced into the separation device 2 does not contain or contains as few other impurities as possible, and ensure the purity of the separated gas, and in other embodiments, the buffer container 8 can also be a device for pretreat the mixed gas, such as: the pre-cooling device for the mixed gas is used for primarily cooling the mixed gas, improving the subsequent separation efficiency or pre-separating device 2 for the mixed gas, is used for primarily separating the mixed gas, is convenient for subsequently adjusting the separation parameters of the separating device 2, such as the separation time, the introduction amount of the separated gas and the like, and is not limited to the above.

Further, in some embodiments, the air intake device 1 further comprises a compressor 10; the compressor 10 is connected with the air inlet end of the buffer container 8 through a pipeline; the second control valve 11 is connected between the buffer container 8 and the compressor 10, and before the mixed gas is led into the buffer container 8, the mixed gas can be pressurized through the compressor 10, so that the pressurized mixed gas can be quickly led into the buffer container 8, the leading-in efficiency of the mixed gas through the air inlet device 1 is improved, the buffer container 8 and the separation device 2 can be pressurized, the sufficient mixed gas quantity in the buffer container 8 and the separation device 2 is ensured, and the treatment efficiency of the mixed gas is improved.

Further, in some embodiments, the air inlet apparatus 1 further includes an air pressure stabilizing unit 12, the air pressure stabilizing unit 12 includes a first bypass pipe 14 and a second bypass pipe 16, when the fourth control valve 19 is opened and the third control valve 18 is closed, the mixed gas is led into the compressor 10 through the first bypass pipe 14, and since the pressure reducer 15 is disposed on the first bypass pipe 14, when the air source pressure of the mixed gas led into the air inlet apparatus 1 is too high, the pressure reducer 15 can perform the pressure reducing function on the air source, so as to ensure that the air pressure of the mixed gas led into the compressor 10 is not too high, and damage of the compressor 10, the buffer container 8 or the separation container 5 caused by the too high air pressure can be avoided; when the air source pressure of the mixed gas introduced into the air inlet device 1 is too small, the fourth control valve 19 is kept in an open state, the third control valve 18 is opened, the low-pressure mixed gas is introduced into the compressor 10 through the first bypass pipeline 14 and the second bypass pipeline 16, and the vacuum compressor 17 positioned on the second bypass pipeline 16 can initially pressurize the mixed gas of the air source or help the mixed gas at the air source position to be completely pumped into the air inlet device 1, so that the mixed gas residue problem of the air source is reduced.

As shown in fig. 5, in some embodiments, the second recovery device 4 includes a liquid pump 20, a storage container, and a fifth control valve 22, and by opening the fifth control valve 22, the separated gas or liquid is introduced into the interior of the storage device 21 through the liquid pump 20;

the second recovery device 4 may further include a control unit 23 inside, the control unit 23 including a third bypass pipe 24 and a fourth bypass pipe 26, the sixth control valve 25 being opened and the seventh control valve 27 and the eighth control valve 30 being closed when the filtered gas or liquid is collected, and the separated gas or liquid being introduced into the storage device 21 through the third bypass pipe 24; by controlling the sixth control valve 25 to close, the seventh control valve 27 to open, and the eighth control valve 30 to close, the separated gas or liquid is introduced into the port 29 through the gas-filled pressure reducer 15 and collected through the port 29, so as to collect a sample and detect the sample, such as detecting the purity of the sample; by controlling the sixth control valve 25 to be opened, the seventh control valve 27 to be closed and the eighth control valve 30 to be opened, the samples are synchronously collected in the process of collecting the separated gas or liquid, so that the samples can be conveniently detected, including purity detection of the samples, pressure detection of the samples, state detection of the samples and the like; in other embodiments, the separated liquid or gas may be sucked into the collecting tank to be collected in a negative pressure manner, and the sample collecting process is not limited to the above-mentioned control sampling manner, and the positions of the components in the control device may be combined in other manners to meet different sampling requirements, or may be performed in other control sampling manners; the manner in which sampling and detection are performed synchronously is not limited to this.

As shown in fig. 6, in some embodiments, the first recovery device 3 may include an adsorption device 31 and a tenth control valve 32, the filtered gas enters the first recovery device 3, by opening the tenth control valve 32, adsorption filtration may be performed through the adsorption device 31 to remove impurities remaining in the gas, and then other gas substances are removed, and then the adsorbed gas is stored or discharged;

as shown in fig. 7, the vacuum pump 36 is started by controlling to open the ninth control valve 35 to pump negative pressure, at this time, if the tenth control valve 32 is opened, the reverse negative pressure pumping can be performed on the adsorption device 31 through the fifth bypass pipeline 34 to promote the desorption treatment on the impurities adsorbed in the adsorption device 31, so that the adsorption device 31 can efficiently adsorb and filter for a long time, the opening of the sixteenth control valve 33 is controlled, the evacuation can be performed on the residual gas in the separation device 2 and the pipeline connected with the separation device, the primary gas separation is ensured, a large amount of gas cannot be remained in the separation device 2, the problem of the later gas separation is further affected, and meanwhile, the damage problem of the separation device 2 caused by the corrosion and the like on the separation device 2 caused by the residual gas in the separation device 2 can be avoided.

In some embodiments, a sixth bypass pipeline 37, a seventh bypass pipeline 39 and an eighth bypass pipeline 44 are further added to the separation device 2, the eleventh control valve 38 is opened to enable the seventh bypass pipeline 39 to be opened, at the same time, the second control valve 11 is opened, when negative pressure is pumped and negative pressure is applied, gas in the buffer container 8 sequentially passes through the second control valve 11, the seventh bypass pipeline 39 and the fifth bypass pipeline 34 to be reversely pumped, cleaning of filtered impurities in the buffer container 8 is promoted, long-term normal filtering operation of the buffer container 8 is ensured, and the sixth bypass pipeline 37 can also be used for recycling waste gas or directly performing direct filtering operation on mixed gas, ensuring sufficient separation treatment on the mixed gas and increasing diversity of mixed gas treatment methods.

The seventh bypass pipeline 39 is connected with the air inlet position of the air inlet device 1 through a fourteenth control valve 40 and is used for exhausting air from the air inlet position of the air inlet device 1, the fifteenth control valve 41 is opened, the vacuum gauge 42 can be used for detecting or monitoring the state of negative pressure pumped by the vacuum pump 36, the negative pressure pumping value in the pipeline is controlled in a proper range, the eighth bypass pipeline 44 is used for connecting the sixth bypass pipeline 37 and the pipeline of the storage device 21, the second recovery device 4 is connected with the air inlet device 1, and each position point in the separation device 2 is conveniently and directly connected by controlling and opening the thirteenth control valve 45 and the second control valve 11, so that the separation device 2 is conveniently and rapidly pumped with vacuum, and the vacuum pumping efficiency is improved; in other embodiments, the direct connection of the locations of the separation device 2 may be in other ways, provided that the direct communication to the locations of the separation device 2 is improved; and is not limited thereto.

The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.

Claims (10)

1. A mixed gas separation device, characterized in that: comprises an air inlet device (1), a separation device (2), a first recovery device (3) and a second recovery device (4);

the air inlet device (1) is externally connected with an external air source and the separation device (2) through a pipeline, and mixed gas containing different solidifying points is conveyed into the separation device (2) through the air inlet device (1);

the separation device (2) comprises a separation container (5), a heating device (6) and a refrigerating device (7), wherein the heating device (6) and the refrigerating device (7) are respectively connected with the separation container (5) so as to heat or refrigerate the mixed gas in the separation container (5);

the first recovery device (3) and the second recovery device (4) are respectively connected with the separation device (2) through pipelines;

wherein the separation device (2) refrigerates the mixed gas to form a mixture of solids and gas, and the refrigerated gas in the separation device (2) is conveyed to the first recovery device (3); the gas to be separated and in a solid state is heated into liquid or gas by the heating device (6) and is conveyed to the second recovery device (4) for recovery.

2. A mixed gas separator according to claim 1, wherein:

the separation device (2) is used for separating sulfur hexafluoride and nitrogen.

3. A mixed gas separator according to claim 1, wherein:

the air inlet device (1) comprises a cache container (8); the buffer container (8) is connected with the separation device (2) through a pipeline, and the buffer container (8) is used for buffering and filtering mixed gas;

a first control valve (9) is arranged on a pipeline connected between the buffer container (8) and the separation device (2).

4. A mixed gas separator according to claim 3, wherein:

the air inlet device (1) further comprises a compressor (10); the compressor (10) is connected with the cache container (8) through a pipeline; a second control valve (11) is connected between the buffer container (8) and the compressor (10).

5. A mixed gas separator according to claim 4, wherein:

the air inlet device (1) further comprises an air pressure stabilizing unit (12), the air pressure stabilizing unit (12) is connected with the compressor (10) through a pipeline, and the air pressure stabilizing unit (12) is used for adjusting the air pressure of the air source to a preset pressure and then conveying the air source to the compressor (10); an air inlet pipeline (13) is connected to the air pressure stabilizing unit (12), and the air inlet pipeline (13) is used for being connected with an external air source;

wherein the air pressure stabilizing unit (12) comprises a first bypass pipeline (14), and a pressure reducer (15) is arranged on the first bypass pipeline (14);

the air pressure stabilizing unit (12) further comprises a second bypass pipeline (16), the first bypass pipeline (14) and the second bypass pipeline (16) are arranged in parallel, and a vacuum compressor (17) is arranged on the second bypass pipeline (16);

a third control valve (18) is arranged on the second bypass pipeline (16);

a fourth control valve (19) is arranged on the first bypass pipeline (14) or the air inlet pipeline.

6. A mixed gas separator according to claim 5, wherein:

the second recovery device (4) comprises a liquid pump (20) and a storage device (21); the liquid pump (20) connects the separation container (5) and the storage device (21) through a pipeline;

a fifth control valve (22) is connected between the liquid pump (20) and the separation container (5).

7. A mixed gas separator according to claim 6, wherein:

a control unit (23) is also connected between the liquid pump (20) and the storage device (21) through a pipeline; the control unit (23) is used for sampling sulfur hexafluoride led out by the liquid pump (20);

the control unit (23) comprises a third bypass pipeline (24), and a sixth control valve (25) is arranged on the third bypass pipeline (24);

the control unit (23) comprises a fourth bypass pipeline (26), the fourth bypass pipeline (26) is arranged in parallel with the third bypass pipeline (24), and a seventh control valve (27), an inflation pressure reducer (15), a port (29) and an eighth control valve (30) are sequentially connected to the fourth bypass pipeline (26).

8. A mixed gas separator according to claim 7, wherein:

the first recovery device (3) comprises an adsorption device (31); the adsorption device (31) is connected with the separation device (2) through a pipeline, and the adsorption device (31) is used for filtering the gas led out of the separation device (2);

a tenth control valve (32) is connected between the adsorption device (31) and the separation device (2).

9. A mixed gas separator according to claim 8, wherein:

a sixteenth control valve (33) is further arranged between the tenth control valve (32) and the separation device (2), a fifth bypass pipeline (34) is further arranged between the tenth control valve (32) and the sixteenth control valve (33), a ninth control valve (35) and a vacuum pump (36) are arranged on the fifth bypass pipeline (34), and the vacuum pump (36) is arranged at the tail end of the fifth bypass pipeline (34).

10. A mixed gas separator according to claim 9, wherein:

a sixth bypass pipeline (37) is connected between the first recovery device (3) and the cache container (8); an eleventh control valve (38) is connected to the sixth bypass pipe (37);

a seventh bypass pipeline (39) is arranged between the fourth control valve (19) and the port (29) of the air inlet pipeline (13), the seventh bypass pipeline (39) is communicated with the vacuum pump (36), and a fourteenth control valve (40) is arranged on the seventh bypass pipeline (39); a fifteenth control valve (41) and a vacuum gauge (42) are connected between the fourteenth control valve (40) and the port (29) of the air inlet pipeline (13);

a pipeline between the control unit (23) and the storage device (21) is communicated with the air inlet pipeline (13), and a twelfth control valve (43) is arranged between the communication part and the storage device (21);

the sixth bypass pipeline (37) is communicated with the storage device (21) through an eighth bypass pipeline (44), and a thirteenth control valve (45) is arranged on the eighth bypass pipeline (44).

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