Absorption-reverse osmosis recovery system for ionic liquid extraction tail gas

Abstract

The utility model discloses an ionic liquid extraction tail gas absorption-reverse osmosis recovery system which comprises an extraction washing machine, a spraying absorption unit, an absorption liquid storage tank, a reverse osmosis concentration unit, a clear water storage tank and a short steaming device, a gas inlet of the spraying absorption unit is connected with a gas outlet of the extraction washing machine; a liquid inlet of the absorption liquid storage tank is connected with a liquid outlet of the spraying absorption unit; a liquid inlet of the reverse osmosis concentration unit is connected with a liquid outlet of the absorption liquid storage tank; a concentrated solution outlet of the reverse osmosis concentration unit is connected with a liquid inlet of the short steaming device; an ionic liquid outlet of the short steaming device is connected with a liquid inlet of the extraction washing machine; a short steaming water outlet of the short steaming device and a purified water outlet of the reverse osmosis concentration unit are connected with the clean water storage tank. The device disclosed by the utility model can effectively improve the comprehensive recovery rate of the extraction agent, reduce the operation cost and reduce the water consumption.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial waste gas treatment and resource recycling technical field more specifically, it is a kind of ion liquid extraction tail gas absorption-reverse osmosis recovery system. BACKGROUND

[0002] Industrial waste gas is generated in the extraction process of lithium battery separator, in the waste gas treatment process, the traditional absorption method has the problem of too high liquid-gas ratio, which leads to large subsequent evaporation energy consumption. The membrane separation process fails to form flow coupling with the absorption system, and has the problem of fast membrane flux decay rate.

[0003] Therefore, how to provide an ion liquid extraction tail gas absorption-reverse osmosis recovery system that can combine a water spraying collection device and a reverse osmosis membrane separation device to achieve the purposes of purifying water and recovering extractant is one of the technical problems urgently to be solved in the field. UTILITY MODEL CONTENT

[0004] Therefore, the utility model provides an ion liquid extraction tail gas absorption-reverse osmosis recovery system, and aims to solve the problems in the prior art.

[0005] To solve the above technical problems, the utility model adopts the following technical scheme:

[0006] An ion liquid extraction tail gas absorption-reverse osmosis recovery system, comprising: an extraction water washing machine, a spraying absorption unit, an absorption liquid storage tank, a reverse osmosis concentration unit, a clean water storage tank and a short evaporation device; the gas inlet of the spraying absorption unit is connected with the gas outlet of the extraction water washing machine; the liquid inlet of the absorption liquid storage tank is connected with the liquid outlet of the spraying absorption unit; the liquid inlet of the reverse osmosis concentration unit is connected with the liquid outlet of the absorption liquid storage tank; the concentrated liquid outlet of the reverse osmosis concentration unit is connected with the liquid inlet of the short evaporation device; the ion liquid outlet of the short evaporation device is connected with the liquid inlet of the extraction water washing machine; and the short evaporation water outlet of the short evaporation device and the clean water outlet of the reverse osmosis concentration unit are both connected with the clean water storage tank.

[0007] Preferably, the spraying absorption unit comprises a vertical spraying tower; the vertical spraying tower is internally provided with double helix flow guide plates and ultrasonic atomizing nozzles.

[0008] Preferably, the reverse osmosis concentration unit comprises a two-stage concentration RO assembly, an online monitor for monitoring electrical conductivity and a delivery pump; the concentrated liquid outlet of the reverse osmosis concentration unit is connected with the liquid inlet of the short evaporation device through the delivery pump.

[0009] Preferably, a precision filter is arranged on the pipeline between the reverse osmosis concentration unit and the absorption liquid storage tank.

[0010] The utility model discloses relative to prior art has obtained following technical effect:

[0011] 1) the utility model discloses adopt double helix guide vane and ultrasonic atomization shower nozzle, can make that ionic liquid tail gas and water contact fully, thereby can increase the dissolving efficiency, and then reduce ionic liquid loss rate;

[0012] 2) the utility model discloses the extraction agent comprehensive recovery rate is ≥95%, and the operating cost is reduced 40% than traditional scheme;

[0013] 3) the utility model discloses the discharge water COD <200mg / L, meets the discharge standard, and can directly reuse or discharge;

[0014] 4) the utility model discloses system integration degree is high;

[0015] 5) the utility model discloses can reduce water consumption. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the schematic diagram of a kind of ionic liquid extraction tail gas absorption-reverse osmosis recovery system of the utility model;

[0017] In the drawing, 1, extraction water washing machine, 2, spray absorption unit, 3, absorption liquid storage tank, 4, reverse osmosis concentration unit, 5, clean water storage tank, 6, short steaming device. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0019] EMBODIMENT

[0020] Refer to Figure 1The utility model discloses a kind of ion liquid extraction tail gas absorption-reverse osmosis recovery systems, comprising: extraction water washing machine 1, spray absorption unit 2, absorption liquid storage tank 3, reverse osmosis concentration unit 4, clean water storage tank 5 and short steaming device 6;The air inlet of spray absorption unit 2 is connected with the air outlet of extraction water washing machine 1;The liquid inlet of absorption liquid storage tank 3 is connected with the liquid outlet of spray absorption unit 2;The liquid inlet of reverse osmosis concentration unit 4 is connected with the liquid outlet of absorption liquid storage tank 3;The concentrated liquid outlet of reverse osmosis concentration unit 4 is connected with the liquid inlet of short steaming device 6;The ion liquid outlet of short steaming device 6 is connected with the liquid inlet of extraction water washing machine 1;The short steaming water outlet of short steaming device 6 and the clean water outlet of reverse osmosis concentration unit 4 are connected with clean water storage tank 5;When using, absorption liquid storage tank 3 is used for temporarily storing tail gas absorption liquid, clean water storage tank 5 is used for storing clean water and short steaming water, and short steaming device 6 can separate water and ion liquid according to different boiling points.

[0021] In the embodiment, the spray absorption unit 2 comprises a vertical spray tower; the vertical spray tower is internally provided with double helix guide plates and ultrasonic atomizing nozzles.

[0022] In the embodiment, the reverse osmosis concentration unit 4 comprises a two-stage concentration RO assembly, an online monitor for monitoring electrical conductivity and a delivery pump; the concentrated liquid outlet of the reverse osmosis concentration unit 4 is connected with the liquid inlet of the short steaming device 6 through the delivery pump.

[0023] In the embodiment, a precision filter is arranged on the pipeline between the reverse osmosis concentration unit 4 and the absorption liquid storage tank 3, which can prolong the service life of the RO membrane.

[0024] In the embodiment, the spray absorption unit further comprises a circulating water pump and a COD adjusting module.

[0025] Working principle:

[0026] During the extraction process of lithium battery separators, heating ultrasonic in the extraction water washing machine 1 can generate tail gas, and the spray absorption unit 2 can absorb the generated tail gas through negative pressure, wherein the spray absorption unit 2 is internally provided with double helix guide plates and ultrasonic atomizing nozzles, and through the COD adjusting module and the circulating water pump, the concentration of the tail gas absorption liquid can be detected, and the concentration of the ion liquid in the tail gas absorption liquid can be roughly judged; when the COD reaches the set value, the tail gas absorption liquid first enters the absorption liquid storage tank 3, and then enters the reverse osmosis concentration unit 4, and is concentrated through the two-stage concentration RO assembly, so that the concentration of the tail gas absorption liquid is concentrated to more than 50%, the COD of the purified water is less than 200 mg / L, and the purified water enters the clean water storage tank 5, and the concentrated liquid enters the short steaming device 6; after the water in the concentrated liquid is evaporated, ion liquid with a purity of more than 99% is obtained, the ion liquid reenters the extraction water washing machine 1, and the short steaming water enters the clean water storage tank 5, thereby completing a cycle.

[0027] The above merely describes preferred embodiments of the present application and is not intended to limit the technical scope of the present application in any way. Any slight modification, equivalent change, and modification made according to the technical essence of the present application shall still fall within the technical scope of the present application.

Claims

1. An ionic liquid extraction off-gas absorption-reverse osmosis recovery system, characterized in that, The application relates to an extraction water washing machine (1), a spray absorption unit (2), an absorption liquid storage tank (3), a reverse osmosis concentration unit (4), a clean water storage tank (5) and a short boiling device (6); the air inlet of the spray absorption unit (2) is connected with the air outlet of the extraction water washing machine (1); the liquid inlet of the absorption liquid storage tank (3) is connected with the liquid outlet of the spray absorption unit (2); the liquid inlet of the reverse osmosis concentration unit (4) is connected with the liquid outlet of the absorption liquid storage tank (3); the concentrated liquid outlet of the reverse osmosis concentration unit (4) is connected with the liquid inlet of the short boiling device (6); the ionic liquid outlet of the short boiling device (6) is connected with the liquid inlet of the extraction water washing machine (1); the short boiling water outlet of the short boiling device (6) and the clean water outlet of the reverse osmosis concentration unit (4) are connected with the clean water storage tank (5). The spray absorption unit (2) comprises a vertical spray tower; double helical guide plates and ultrasonic atomizing nozzles are arranged in the vertical spray tower.

2. The ionic liquid extraction off-gas absorption-reverse osmosis recovery system according to claim 1, characterized in that, The reverse osmosis concentration unit (4) comprises a two-stage concentration RO assembly, an online monitor for monitoring electric conductivity and a conveying pump; the concentrated liquid outlet of the reverse osmosis concentration unit (4) is connected with the liquid inlet of the short boiling device (6) through the conveying pump.

3. The ionic liquid extraction off-gas absorption-reverse osmosis recovery system according to claim 1, characterized in that, A precision filter is arranged on the pipeline between the reverse osmosis concentration unit (4) and the absorption liquid storage tank (3).

4. The ionic liquid extraction off-gas absorption-reverse osmosis recovery system according to claim 1, characterized in that, ​

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