CN217016029U

CN217016029U - Gas permeable membrane device for separating and recycling mixed gas

Info

Publication number: CN217016029U
Application number: CN202220079917.5U
Authority: CN
Inventors: 张新民
Original assignee: Suzhou Lanbei Environmental Protection Co ltd
Current assignee: Suzhou Lanbei Environmental Protection Co ltd
Priority date: 2022-01-12
Filing date: 2022-01-12
Publication date: 2022-07-22
Anticipated expiration: 2032-01-12

Abstract

The utility model discloses a gas permeable membrane device for separating and recycling mixed gas, which comprises a permeable membrane recovery device, wherein the permeable membrane recovery device comprises a permeable membrane recovery tank, the permeable membrane recovery tank is provided with a mixed gas inlet, a first outlet and a second outlet, a permeable membrane is arranged in the permeable membrane recovery tank, the second outlet is arranged on one side of the permeable membrane, and the mixed gas inlet and the first outlet are arranged on the other side of the permeable membrane. Compared with a combustion method or an adsorption method, the mixed gas separation and recovery system has the advantages of small occupied area, low operation cost, less investment, safe and reliable operation, high treatment efficiency and the like. Through the arrangement of the first compressor, the second compressor and the condenser, the organic gas can be fully separated, condensed and recycled, and the separated organic gas can be recycled.

Description

Gas permeable membrane device for separating and recycling mixed gas

Technical Field

The utility model relates to the field of fine chemical engineering, in particular to a gas permeable membrane device for separating and recycling mixed gas.

Background

In the fine chemical production and manufacturing process, a large amount of mixed gas can be generated, taking the mixed gas of methanol gas and nitrogen as an example, a large amount of uncondensed and recycled methanol gas and nitrogen for purging methanol mother liquor are generated when filter pressing workshop equipment and nitrogen-sealed storage tanks of a plurality of fine chemical enterprises transfer materials at present, the methanol gas is high in emission concentration and only mixed with the nitrogen, the conventional method is difficult to treat, and even if the methanol gas is diluted into a large air volume to treat, the problems of high operation cost, low comprehensive utilization value, large potential safety hazard and the like are also faced. The method for treating the tail gas of the methanol gas and nitrogen mixed process mainly comprises a combustion method and an adsorption method, wherein the combustion method mainly takes heat accumulating type high-temperature thermal oxidation (RTO) as a main part, the method can realize standard emission, but does not have the recycling value of methanol and nitrogen, the operation cost is higher, and in the case of the mixed tail gas of methanol gas and nitrogen with higher concentration, the safe treatment can be carried out after dilution is carried out by multiple times, so the investment cost is increased; the adsorption method is mainly a columnar activated carbon adsorption method in the treatment, and the method is usually combined with spray absorption to reduce the intake concentration of methanol gas, so that the amount of generated waste liquid is large, and the operation cost is high.

SUMMERY OF THE UTILITY MODEL

In order to overcome the above disadvantages, the present invention provides a gas permeable membrane device for separating and recycling mixed gas, which can safely and efficiently separate organic gas, thereby realizing recycling of organic gas.

In order to achieve the above purposes, the utility model adopts the technical scheme that: the utility model provides a gas-permeable membrane device for mist separation and retrieval and utilization, includes osmotic membrane recovery unit, osmotic membrane recovery unit retrieves the jar including the osmotic membrane, be provided with mist entry, first export and second export on the osmotic membrane recovery jar, the inside osmotic membrane that is provided with of osmotic membrane recovery jar, the second export sets up one side of osmotic membrane, mist entry and first export setting are in the opposite side of osmotic membrane. When the mixed gas enters the permeable membrane recovery tank through the mixed gas inlet, one gas is easier to permeate from the permeable membrane and then flows out from the second outlet, and the other gas cannot effectively permeate and diffuse from the permeable membrane, is trapped and flows out from the first outlet, so that the mixed gas is separated.

Furthermore, the permeable membrane recovery tank is provided with a plurality of groups, wherein the first outlet of the permeable membrane recovery tank is connected with the mixed gas inlet of the permeable membrane recovery tank.

Further, still include liquid storage pot and gas holder, the gas holder with first exit linkage, the liquid storage pot with the second export intercommunication. And the gas flowing out of the first outlet enters the gas storage tank, and the gas flowing out of the second outlet is finally liquefied and enters the liquid storage tank.

The demisting tank is connected with the mixed gas inlet, and the demisting tank is connected with the first compressor.

Further, still include the condenser, the entry of condenser with the second exit linkage, the gas outlet of condenser with first compressor is connected, the liquid outlet of condenser with the liquid storage pot intercommunication.

The condenser is connected with the condenser, and the outlet of the first liquid accumulation tank is connected with the liquid storage tank; the inlet of the second liquid accumulation tank is connected with the first compressor, and the outlet of the second liquid accumulation tank is connected with the liquid storage tank.

Further, the vacuum pump is connected with the second outlet, and the second compressor is connected with the vacuum pump and the condenser.

Further, still include the PLC controller, the PLC controller with first compressor, defogging jar, osmotic membrane recovery unit, the gas holder, the vacuum pump, the second compressor, condenser electric connection.

Further, the mixed gas comprises an organic gas, wherein the organic gas comprises one of dichloromethane, methanol, ethanol, n-propanol, isopropanol, bromoethane and bromopropane.

Further, the organic gas includes methanol gas.

The utility model has the beneficial effects that:

1) compared with a combustion method or an adsorption method, the mixed gas separation and recovery system has the advantages of small occupied area, low operation cost, less investment, safe and reliable operation, high treatment efficiency and the like.

2) Through the arrangement of the first compressor, the second compressor and the condenser, the organic gas can be fully separated and condensed and recovered, and the amount of the organic gas contained in the other separated gas is low, so that the organic gas can be recovered and reused.

3) The whole set of device is controlled by a PLC program, full-automatic monitoring and control are carried out on the equipment, and according to the process requirements, the recycling pressure, the air inlet pressure and the intermittent time during automatic operation can be set through the program, so that the equipment is operated automatically.

Drawings

FIG. 1 is a schematic connection diagram of a mixed gas separation and recovery system according to a preferred embodiment of the present invention;

FIG. 2 is a schematic diagram of the separation of mixed gases by a permeable membrane according to a preferred embodiment of the present invention.

In the figure:

1. a first compressor; 2. a demisting tank; 21. a safety valve; 3. a permeable membrane recovery unit; 31. a permeable membrane recovery tank; 311. a first outlet; 312. a second outlet; 313. a mixed gas inlet; 32. a permeable membrane; 33. Methanol gas; 34. nitrogen gas; 4. a gas storage tank; 5. a vacuum pump; 6. a second compressor; 7. a condenser; 81. a first liquid accumulation tank; 82. a second liquid accumulation tank; 9. a liquid storage tank.

Detailed Description

The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the utility model easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the utility model.

Referring to the attached drawing 1, a gas permeable membrane device for mixed gas separation and retrieval and utilization in this embodiment, including first compressor 1, defogging jar 2 and osmotic membrane recovery unit 3, first compressor 1 and defogging jar 2 are connected, are provided with relief valve 21 on the defogging jar 2, and defogging jar 2 and osmotic membrane recovery unit 3 are connected, and mixed gas gets into defogging jar 2 through first compressor 1 compression and cushions and the defogging, then goes into osmotic membrane recovery unit 3 and carries out the mixed gas separation. The mixed gas comprises organic gas, wherein the organic gas comprises one of dichloromethane, methanol, ethanol, n-propanol, isopropanol, bromoethane and bromopropane.

Referring to fig. 1 and 2, in the present embodiment, the permeable membrane recovery apparatus 3 includes a permeable membrane recovery tank 31, the permeable membrane recovery tank 31 is provided with a mixed gas inlet 313, a first outlet 311, and a second outlet 312, the permeable membrane recovery tank 31 is internally provided with the permeable membrane 32, the second outlet 312 is provided on one side of the permeable membrane 32, and the mixed gas inlet 313 and the first outlet 311 are provided on the other side of the permeable membrane. The mixed gas in this embodiment is a mixed gas of methanol gas 33 and nitrogen gas 34, the permeable membrane 32 is a high-performance polymer composite membrane LBR-JC120, and the advantages of the polymer composite membrane are as follows:

1) the separation efficiency is high, and the separation efficiency of 95-99% can be achieved by primary membrane separation;

2) the pressure resistance is good, and the adaptability to the working condition is better than that of other polymer membranes;

3) the service life is long, and the service life can be 4-7 years;

4) the safety is high, and the problems of potential safety hazards and the like caused by adsorption and heat release of the activated carbon can not be generated;

5) the replacement is convenient, and the membrane replacement is convenient after the membrane is used for 4-7 years;

6) the equipment has small floor area and is easy to install and maintain.

The separation and recovery are performed by using a polymer composite membrane having permselectivity to the methanol gas 33, the methanol gas 33 is easier to permeate (dissolve and diffuse) from the membrane than the nitrogen gas 34, and when the methanol gas 33 contacts with the surface of the material of the permeable membrane 32, the methanol gas can rapidly dissolve and diffuse to permeate the permeable membrane 32, is separated from the mixed gas, and then flows out from the second outlet 312; while the nitrogen gas 34 cannot permeate the diffusion membrane surface efficiently or rapidly and is trapped, the nitrogen gas 34 flows out from the first outlet 311, and thus the mixed gas of the methanol gas 33 and the nitrogen gas 34 can be separated. The system is not limited to the methanol gas 33 and the nitrogen gas 34, and is applicable to the system for separating and recovering the mixed gas as long as one of the mixed gas is more likely to permeate through the permeable membrane than the other gas.

In some embodiments, the permeable membrane recovery tanks 31 are provided with a plurality of sets, and the first outlet 311 of the former set of permeable membrane recovery tanks 31 is connected with the mixed gas inlet 313 of the latter set of permeable membrane recovery tanks 31. Because a small amount of methanol gas 33 can be mixed when the nitrogen gas 34 flows out from the second outlet 312, in order to increase the separation effect of the mixed gas, the permeable membrane recovery tank 31 is provided with a plurality of groups, after the mixed gas is separated by the permeable membrane recovery tank 31 in the previous group, the nitrogen gas 34 with a small amount of methanol gas 33 flows out from the first outlet 311, and enters the permeable membrane recovery tank 31 in the next group to separate the methanol gas 33 again, thereby improving the separation effect.

In some embodiments, the nitrogen gas storage tank 4 is further included, the nitrogen gas storage tank 4 is connected with the first outlet 311, the nitrogen gas 34 flowing out from the first outlet 311 enters the nitrogen gas storage tank 4, the nitrogen gas 34 is stored by the nitrogen gas storage tank 4, and the nitrogen gas 34 can be recycled.

In some embodiments, the system further comprises a second compressor 6 and a vacuum pump 5, the vacuum pump 5 is connected with the second outlet 312, and the second compressor 6 is connected with the vacuum pump 5 and the condenser 7. Through the arrangement of the vacuum pump 5, a pressure difference is formed between two sides of the permeable membrane 32, and the driving force required by the membrane permeation is achieved. The methanol gas 33 is allowed to smoothly permeate through the permeable membrane 32, and then flows out from the second outlet 312, is compressed by the second compressor 6, and then enters the condenser 7 to be condensed. The condenser 7 is connected with the first compressor 1 and the first liquid accumulation tank 81, the outlet of the first liquid accumulation tank 81 is connected with the liquid storage tank 9, after the methanol gas 33 is condensed into liquid through the condenser 7, the liquid enters the first liquid accumulation tank 81, a small amount of gaseous nitrogen 34 and the methanol gas 33 enter the first compressor 1, and the gaseous nitrogen 34 and the methanol gas 33 are mixed with the mixed gas which is just input and are separated and recycled through the system again.

In some embodiments, a second liquid accumulation tank 82 is further included, an inlet of the second liquid accumulation tank 82 is connected to the first compressor 1, and an outlet of the second liquid accumulation tank 82 is connected to the liquid accumulation tank 9. The first compressor is provided with a condensing device, the methanol gas 33 can be condensed into liquid, the mixed gas is compressed and condensed by the first compressor 1, and the liquid enters the second liquid accumulating tank 82 and then enters the liquid storage tank 9 for storage for later use. In order to realize the efficient separation of the methanol gas 33 and the nitrogen gas 34, a first compressor 1, a second compressor 6 and a condenser 7 are additionally arranged in the device, so that the methanol gas 33 can be fully separated, condensed and recycled, and the separated nitrogen gas 34 has low content of the methanol gas 33 and can be recycled.

In some embodiments, the PLC controller is electrically connected to the first compressor 1, the demisting tank 2, the permeable membrane recovery unit 3, the gas storage tank 4, the vacuum pump 5, the second compressor 6, and the condenser 7. The whole set of device is controlled by a PLC program, automatically switched and fully automatically operated. The control system adopts Siemens PLC program control to carry out full-automatic monitoring and control on the equipment. The nitrogen 34 recycle pressure, feed pressure, and pause time during automatic operation may be programmed according to process requirements.

The working process comprises the following steps: the system incoming gas (the mixed gas of the methanol gas 33 and the nitrogen gas 34) is compressed and condensed by the first compressor 1, the condensed liquid of the methanol gas 33 enters the liquid storage tank 9 through the second liquid accumulation tank 82 to be stored for standby use, the mixed gas of the methanol gas 33 and the nitrogen gas 34 compressed and condensed by the first compressor 1 enters the permeable membrane recovery device 3 for mixed gas separation after being buffered and demisted by the demisting tank 2, the separated nitrogen gas 34 flows out through the first outlet 311 to enter the gas storage tank 4 for storage, the separated gas of the methanol gas 33 (with a small amount of nitrogen gas 34) enters the condenser 7 for condensation after being compressed by the second compressor 6, the methanol gas 33 is condensed into liquid which is stored in the liquid storage tank 9 through the first liquid accumulation tank 81, and the condensed gas (the mixed state of the methanol gas 33 and the nitrogen gas 34) enters the system again through the first compressor 1 for separation and recovery.

In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", and the like indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings, which are merely for convenience of description and simplification of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed in a particular orientation, and operate, and thus, should not be construed as limiting the present invention.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

The above embodiments are provided only for illustrating the technical idea and features of the present invention, and the purpose of the present invention is to provide those skilled in the art with understanding and implementing the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims

1. The utility model provides a gas permeable membrane device for mist separation and retrieval and utilization, its characterized in that, includes osmotic membrane recovery unit (3), osmotic membrane recovery unit (3) are including osmotic membrane recovery tank (31), be provided with mixed gas entry (313), first export (311) and second export (312) on osmotic membrane recovery tank (31), osmotic membrane recovery tank (31) inside is provided with osmotic membrane (32), second export (312) set up one side of osmotic membrane (32), mixed gas entry (313) and first export (311) set up the opposite side of osmotic membrane (32).

2. The gas permeable membrane device for the separation and reuse of mixed gas according to claim 1, wherein the permeable membrane recovery tank (31) is provided with a plurality of sets, and the first outlet (311) of the permeable membrane recovery tank (31) of the former set is connected with the mixed gas inlet (313) of the permeable membrane recovery tank (31) of the latter set.

3. A gas permeable membrane device for the separation and reuse of mixed gases according to claim 2, further comprising a first compressor (1) and a demisting tank (2), said demisting tank (2) being connected to said mixed gas inlet (313), said demisting tank (2) being connected to said first compressor (1).

4. The gas permeable membrane device for separating and recycling mixed gas according to claim 3, further comprising a condenser (7) and a liquid storage tank (9), wherein an inlet of the condenser (7) is connected to the second outlet (312), an air outlet of the condenser (7) is connected to the first compressor (1), and a liquid outlet of the condenser (7) is communicated to the liquid storage tank (9).

5. The gas permeable membrane device for mixed gas separation and reuse according to claim 4, further comprising a gas storage tank (4), wherein said gas storage tank (4) is connected to said first outlet (311), and said liquid storage tank (9) is communicated with said second outlet (312).

6. The gas permeable membrane apparatus for mixed gas separation and reuse according to claim 5, further comprising a first liquid trap tank (81) and a second liquid trap tank (82), wherein an inlet of said first liquid trap tank (81) is connected to a liquid outlet of said condenser (7), and an outlet of said first liquid trap tank (81) is connected to said liquid storage tank (9); the inlet of the second liquid accumulation tank (82) is connected with the first compressor (1), and the outlet of the second liquid accumulation tank (82) is connected with the liquid storage tank (9).

7. The gas permeable membrane device for mixed gas separation and reuse according to claim 6, further comprising a second compressor (6) and a vacuum pump (5), wherein said vacuum pump (5) is connected to said second outlet (312), and said second compressor (6) is connected to said vacuum pump (5) and said condenser (7).

8. The gas permeable membrane device for mixed gas separation and reuse according to claim 7, further comprising a PLC controller, wherein the PLC controller is electrically connected with the first compressor (1), the demisting tank (2), the permeable membrane recycling device (3), the gas storage tank (4), the vacuum pump (5), the second compressor (6), and the condenser (7).