CN114225641A - Two-stage air return organic gas recovery method, recovery module and recovery system - Google Patents
Two-stage air return organic gas recovery method, recovery module and recovery system Download PDFInfo
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- CN114225641A CN114225641A CN202111566429.3A CN202111566429A CN114225641A CN 114225641 A CN114225641 A CN 114225641A CN 202111566429 A CN202111566429 A CN 202111566429A CN 114225641 A CN114225641 A CN 114225641A
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- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/06—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
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Abstract
The invention relates to a method, a module and a system for recycling organic gas by double-stage air return, which comprises two-stage air return flow path circulation, wherein the first circulation uses high-temperature low-concentration organic gas generated by a machine head side and/or machine tail side oven unit as a regeneration gas heating source to perform desorption regeneration on the organic gas adsorbed on a rotating wheel, and the organic gas returns to the machine head side and/or machine tail side oven unit after condensation recovery and heat exchange; and the high-temperature high-concentration organic gas generated by the middle side oven unit is recycled and returned to the middle side oven after heat exchange, condensation recovery, adsorption and secondary heating. The whole method, module and system make full use of heat exchange, ensure full condensation and recovery of the organic solvent, save energy, have high efficiency and low cost, and are beneficial to industrial popularization.
Description
Technical Field
The invention relates to a method, a recovery module and a recovery system for recovering organic gas by double-stage air return, in particular to a method, a module device and a system for realizing high-efficiency recovery and high-efficiency utilization of heat energy of organic gas by combining double-stage air return circulation with an adsorption and desorption assembly.
Background
In the production process of lithium battery, coating is a very important step, the equipment mainly used in the step is a coating machine, the oven is the most important part of the coating machine and comprises a plurality of oven units, each oven unit is communicated with one another into a whole, the coated substrate moves forward in the oven in the same direction, the positive pole piece of the lithium battery is continuously baked at high temperature in each oven unit in the advancing process, and high-temperature N-methyl pyrrolidone (NMP) waste gas is generated in the process of coating and drying the positive pole piece of the lithium battery, in the production line of the lithium battery cathode coating machine drying oven, the drying oven at the head side (or the tail side) discharges waste gas with high temperature and low NMP concentration, the drying oven at the middle side discharges waste gas with high temperature and high NMP concentration, since NMP is expensive and produces harmful gases when discharged into the atmosphere, it is important to fully recycle NMP in this field.
Fig. 1 shows a NMP recovery system in the prior art, which includes an oven 1000, a gas heat exchange recovery module 2000 and a rotary wheel adsorption regeneration module 3000, wherein the gas heat exchange recovery module 2000 includes a heat exchanger 2001 and a condensation recovery device 2002; the rotary wheel adsorption regeneration module 3000 comprises an adsorption area 3001, a cooling area 3002 and a regeneration area 3003, wherein gas generated in the oven 1000 enters from the high-temperature side of the heat exchanger 2001, is condensed and recovered by the condensation and recovery device 2002, and a part of the gas returns to the low-temperature side of the heat exchanger 2001, exchanges heat with high-temperature waste gas newly flowing into the high-temperature side of the heat exchanger 2001 to increase the temperature and then returns to the oven 1000 again; and the other part of the condensed and recovered gas enters the rotary wheel regeneration module 3000, and after re-adsorption in the adsorption area 3001, part of the gas is discharged to the atmosphere, and the other part of the gas flows into the cooling area 3002 and then acts on the regeneration area 3003 through secondary heating to generate regenerated and concentrated NMP gas, and the regenerated and concentrated NMP gas is condensed and recovered again and then discharged to the atmosphere.
However, in this scheme, a plurality of groups of gas heat exchange recovery modules 2000 are required to be arranged according to the length of the production line of the oven 1000, each group is required to be provided with a heat exchanger 2001 and a condensation recovery device 2002, the condensation recovery device is required to be continuously and circularly introduced with a refrigerant, and the rotating wheel adsorption regeneration module 3000 is added, so that the manufacturing cost of the whole system is relatively high, the heat energy of the whole system is not fully utilized, and the energy consumption cost is high.
Disclosure of Invention
In view of the fact that the prior art cannot simultaneously meet the requirements of users on reducing the manufacturing cost and the energy consumption cost of an organic gas recovery system, the invention mainly aims to provide the organic solvent recovery system which meets the requirements of customers and markets, can fully utilize heat energy and maximally reduce the energy consumption and the manufacturing cost of the system.
In order to achieve the above object, the present invention provides, in a first aspect, a two-stage air return organic gas recovery method, including the following steps:
i) a step of subjecting the first off-gas from the partial production unit to first heat exchange;
ii) a step of subjecting the first off-gas after the first heat exchange to a first condensation recovery;
iii) a step of subjecting at least a part of the first off-gas recovered by the first condensation to adsorption recovery;
iv) a step of heating the first waste gas after adsorption recovery for the second time to produce the first-stage return air and returning the first-stage return air to the production device;
v) a step of regenerating and desorbing the first off-gas recovered by adsorption from the second off-gas from the other part of the production apparatus to produce a regenerated gas;
vi) subjecting said regenerated gas to a second condensation recovery step;
vii) a step of subjecting at least part of the regenerated gas recovered by the second condensation to the first heat exchange with the first off-gas;
viii) a step of returning at least a portion of the regenerated gas after the first heat exchange to the production unit to produce a second stage return air.
Alternatively, in the step iv), the second heating is an operation of directly heating the first off-gas after adsorption recovery by a gas heater.
Alternatively, in the step iv), the second heating is an operation of performing a second heat exchange between the first off-gas after adsorption recovery and the second off-gas before participating in the desorption step.
Alternatively, in the step iv), the second heating is an operation of performing third heat exchange on the first off-gas after adsorption recovery and the first off-gas before participating in the first heat exchange step in the step i).
Further, in step iii), a part of the first waste gas after the first condensation and recovery is subjected to adsorption and recovery, and the other part of the first waste gas is subjected to centralized treatment and purification and then is discharged to the atmosphere.
Further, in step vii), part of the regenerated gas recovered by the second condensation is subjected to the first heat exchange with the first exhaust gas, and the other part of the regenerated gas is subjected to centralized treatment and purification, and then discharged to the atmosphere.
The invention provides a double-stage air return organic gas recovery module in a first aspect, which comprises:
a first gas flow inlet;
a first heat exchanger;
a first condensate recovery assembly;
further comprising:
the adsorption and desorption component at least comprises an adsorption area and a desorption area;
a first airflow outlet;
a first warming component;
the adsorption area, the first temperature raising component and the first airflow outlet are sequentially connected through an air circuit to form a first-stage air return circulation of first waste gas;
a second gas flow inlet;
a second condensate recovery assembly;
a second gas flow outlet;
the second airflow inlet, the desorption area, the second condensation recovery assembly, the first heat exchanger and the second airflow outlet are sequentially connected to form a second-stage air return circulation of the second waste gas.
Optionally, the first warming component is a gas heater.
Optionally, the first temperature raising assembly is a second heat exchanger, a high-temperature pipe section of the second heat exchanger is disposed between the second gas flow inlet and the desorption region, and a low-temperature pipe section of the second heat exchanger is disposed between the adsorption region and the first gas flow outlet.
Optionally, the first temperature raising assembly is a third heat exchanger, and a high-temperature pipe section of the third heat exchanger is arranged between the first airflow inlet and the inlet of the high-temperature pipe section of the first heat exchanger; the low temperature tube section of the third heat exchanger is disposed between the adsorption zone and the first gas flow outlet.
Further, the condensation recycling device also comprises a centralized processing area, and the centralized processing area is respectively connected with the outlet of the first condensation recycling assembly and the outlet of the second condensation recycling assembly.
Preferably, the first heat exchanger is disposed to be inclined downward in the first exhaust gas flow direction.
Preferably, the first condensation recovery assembly is a cooling water coil or a chilled water coil.
Preferably, the second condensation recovery assembly at least comprises a first second condensation recovery device and a second condensation recovery device, wherein the first second condensation recovery device is a cooling water coil, and the second condensation recovery device is a chilled water coil.
Preferably, the adsorption and desorption component is a molecular sieve adsorption and desorption rotating wheel.
Furthermore, the adsorption and desorption rotating wheel further comprises a cooling area, an inlet of the cooling area is connected with an outlet of the adsorption area through a gas circuit, and an outlet of the cooling area is connected with an inlet of the adsorption area through a gas circuit.
Alternatively, the number of adsorption zones is at least two.
The invention provides in a third aspect a two-stage return air organic gas recovery system comprising:
a production device;
the double-stage air return organic gas recovery module is connected with the air path of the production device;
wherein the production device comprises a first production device unit and a second production device unit;
the first production device unit generates first waste gas and comprises a first production device unit airflow outlet and a first production device unit airflow inlet, the first production device unit airflow outlet is connected with the first airflow inlet air path, and the first production device unit airflow inlet is connected with the first airflow outlet air path;
the second production device unit generates second waste gas and comprises a second production device unit airflow outlet and a second production device unit airflow inlet, the second production device unit airflow outlet is connected with the second airflow inlet through a gas circuit, and the second production device unit airflow inlet is connected with the second airflow outlet through a gas circuit.
Preferably, the production device is a lithium battery cathode coating machine oven or a printing, semiconductor and adhesive tape manufacturing environment device.
Preferably, the production device is a lithium battery cathode coating machine oven production line, wherein the first production device unit is at least one section of oven at the middle side of the production line; the second production device unit is at least one section of oven at the head side and/or the tail side of the production line.
Based on the design, the invention has the beneficial effects that: firstly, by adopting the two-stage air return organic gas recovery system, on one hand, high-temperature organic gas generated by a plurality of sections of drying ovens on the machine head side and/or the machine tail side is used as a regeneration gas heating source to carry out regeneration desorption on the organic gas adsorbed on the rotating wheel and subjected to heat exchange and condensation recovery in the middle-side drying oven; on the other hand, the regenerated gas is condensed and recovered and then exchanges heat with high-temperature organic gas generated by the middle-side oven, so that the whole system not only makes full use of the heat energy of each section of oven, but also fully condenses and recovers the organic gas; secondly, the gas recovery system does not need to comprise a plurality of gas recovery modules, each gas recovery module can be responsible for as many as six oven units, and the four gas recovery modules can basically meet the requirements of heat exchange and organic solvent recovery of one oven production line, so that the manufacturing cost and the production cost of the system are greatly reduced; thirdly, the second heat exchanger can be arranged at the upstream of the regeneration area, so that the heat exchange is carried out between the low-temperature gas adsorbed by the middle-side oven and the high-temperature gas generated at the head side and/or the tail side, the heat utilization of the system is improved, the additional heating operation on the gas returned to the oven is not needed, the energy consumption of the system is further reduced, and the cost is saved; fourthly, the first heat exchanger of the present invention is disposed to be inclined downward in the flow direction of the first exhaust gas, and can prevent a part of the liquid NMP generated during the heat exchange from staying in the heat exchanger; fifthly, the invention is also provided with a centralized processing area connected with the outlet of the first condensation recovery assembly and the outlet of the second condensation recovery assembly, so that the oven can be kept in a micro-negative pressure state; sixth, the rotating wheel of the present invention is provided with a cooling zone and/or a plurality of adsorption zones, which can improve the adsorption effect and the adsorption efficiency of the rotating wheel as much as possible. In conclusion, the system can reduce the manufacturing cost of the system to the maximum extent, effectively improve the recovery efficiency of the organic gas, efficiently utilize the heat energy of the system, reduce the energy consumption of the system and be beneficial to marketization application.
Drawings
FIG. 1 is a schematic diagram showing the structural principle of a NMP recovery system in the prior art;
FIG. 2 is a schematic structural diagram of a first embodiment of a two-stage air return organic gas recovery module and system according to the present invention;
FIG. 3 is a schematic structural diagram of a second embodiment of the two-stage air return organic gas recovery module and system according to the present invention;
FIG. 4 is a schematic structural diagram of a third embodiment of the two-stage air return organic gas recovery module and system according to the present invention;
fig. 5 is a schematic structural diagram of a fourth embodiment of the two-stage air return organic gas recovery module and system according to the present invention.
Description of reference numerals:
1. a drying oven of the lithium battery cathode coating machine; 11. a headstock side and/or tail side oven unit; 12. a middle side oven unit; 2. the double-stage air return organic gas recovery module; 21. a first gas flow inlet; 22. a first heat exchanger; 23. a first condensate recovery assembly; 24. an adsorption and desorption rotating wheel; 241. an adsorption zone; 242. a desorption zone; 243. a cooling zone; 25. a first airflow outlet; 26. a second gas flow inlet; 27. a second condensate recovery assembly; 28. a second gas flow outlet; 29. a gas heater; 30. a second heat exchanger; 31. a third heat exchanger; 32. a centralized processing area; 1000. an oven 1000; 2000. a gas heat exchange recovery module; 2001. a heat exchanger; 2002. a condensation recovery device; 3000. a runner adsorption regeneration module; 3001. an adsorption zone; 3002. a cooling zone; 3003. a regeneration zone.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments shown in the drawings. It should be noted that these embodiments are not intended to limit the present invention, and those skilled in the art should be able to make functional, methodical, or structural equivalents or substitutions according to these embodiments without departing from the scope of the present invention.
Meanwhile, in the present specification, descriptions related to orientations such as up, down, left, right, front, rear, inner, outer, longitudinal, lateral, vertical, horizontal, etc., indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention.
In the description of the present specification, unless otherwise specifically stated or limited, the terms "mounted," "connected," and "connected" are used broadly and may be, for example, fixedly, detachably, or integrally connected, mechanically or electrically connected, directly or indirectly connected through an intermediate medium, or communicated between two elements. To those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations, and the present invention should not be construed as being limited thereto.
For convenience of description, the lithium battery cathode coater oven is selected as the production device in each preferred embodiment of the present invention, and the principle of efficient NMP recovery and heat energy utilization between the lithium battery cathode coater oven and the two-stage air returning organic gas recovery module is mainly illustrated, but it should be understood that the production device described in the present invention should not be limited to the lithium battery cathode coater oven, nor should the adsorbed organic gas be limited to NMP gas, and all production devices involving high temperature organic gas recovery in production, such as: printing, semiconductor, adhesive tape manufacturing devices, all of which can be used in conjunction with the dual stage return air organic gas recovery module of the present invention, the lithium battery cathode coater oven should not be construed as limiting the scope of protection of the production device in the claims.
Fig. 2 is a schematic structural diagram of a first embodiment of the two-stage air return organic gas recovery system according to the present invention, the two-stage air return organic gas recovery system includes: lithium battery cathode coating machine oven 1 and two-stage air return organic gas recovery module 2, lithium battery cathode coating machine oven 1 includes head side and/or tail side oven unit 11 and middle side oven unit 12, wherein, because head side pole piece temperature is lower make head side NMP volatile volume less, and tail side NMP concentration is lower, and volatile volume is also less, and head side and/or tail side oven unit discharge high temperature and the lower waste gas of NMP concentration, and middle side oven unit discharge high temperature and the higher waste gas of NMP concentration, two-stage air return organic gas recovery module 2 includes first airflow inlet 21, first heat exchanger 22, first condensation recovery subassembly 23, rotary suction wheel desorption 24, first airflow outlet 25, second airflow inlet 26, second condensation recovery subassembly 27 and second airflow outlet 28. The adsorption and desorption rotating wheel 24 further comprises an adsorption area 241 and a desorption area 242, which form a two-stage organic gas recovery and return air circulation passage of the two-stage air return organic gas recovery module 2, wherein the first airflow inlet 21, the first heat exchanger 22, the first condensation recovery assembly 23, the adsorption area 241 of the adsorption and desorption rotating wheel 24 and the first airflow outlet 25 are sequentially connected by an air circuit, and a first-stage organic gas recovery and return air circulation is formed; the second airflow inlet 26, the desorption area 242 of the adsorption and desorption rotating wheel 24, the second condensation recovery component 27, the first heat exchanger 22 and the second airflow outlet 28 are sequentially connected by air circuits, so that a second-stage organic gas recovery and air return circulation is formed. Compared with the middle-side oven unit 12, the temperature of the gas discharged from the head-side and/or tail-side oven unit 11 is higher, and the concentration of the contained NMP gas is lower, so that the high-temperature waste gas generated from the head-side and/or tail-side oven unit 11 flows into the two-stage air-returning organic gas recovery module 2 through the second gas inlet 26 and acts as a regeneration gas heating source on the desorption area 242 of the adsorption and desorption rotating wheel 24, so as to concentrate and desorb the organic solvent adsorbed on the adsorption and desorption rotating wheel 24 and generate regenerated gas; while the high-temperature exhaust gas generated from the middle-side oven unit 12 flows into the two-stage return air organic gas recovery module 2 through the first gas flow inlet 21 and enters the subsequent heat exchange, condensation recovery and rotary wheel adsorption processes, it should be understood that the regenerated gas component referred to in the present invention should at least include NMP generated from the head-side and/or tail-side oven unit 11 and NMP generated from the middle-side oven unit 12 that is adsorbed by the adsorption zone 241 after being concentrated and desorbed to recover the gas state. The heat exchanger 201 of the present invention is preferably a plate heat exchanger, and is placed in a diamond shape, but all other types of heat exchangers that can perform heat exchange, such as heat pipe heat exchangers and their adaptive fixing and mounting manners, are covered in the protection scope of the present invention; the first condensation recovery assembly of the invention is preferably a cooling water coil, and the second condensation recovery assembly is preferably a combination of a cooling water coil and a chilled water coil, but it should be understood that the types and combinations of the selected elements of the first and second condensation recovery assemblies only represent preferred embodiments, and all the elements and combinations capable of realizing condensation recovery, such as: the first condensing and recycling assembly is a cooling water coil or a chilled water coil, the second condensing and recycling device I is a cooling water coil, and the second condensing and recycling device II is a chilled water coil, which are all covered by the protection scope of the invention. In addition, although the embodiments of the present invention all employ molecular sieve adsorption/desorption rotating wheels, it should be understood that the adsorption/desorption rotating wheels only represent preferred embodiments, and should not be construed as limiting the scope of the claims, and all adsorption/desorption components, such as porous adsorption materials, that can achieve the adsorption/desorption function should be included in the scope of the present invention.
Because the temperature of the NMP waste gas generated by the middle-side oven unit 12 is significantly reduced after passing through the first heat exchanger 22 for heat exchange, the first condensation recovery component 23 for condensation recovery, and the adsorption area 241 of the adsorption and desorption rotating wheel 24 for adsorption, in order to meet the requirement of the drying temperature, in this embodiment, the gas heater 29 is arranged at the downstream of the adsorption area 241, and performs secondary heating on the adsorbed gas and returns to the middle-side oven unit 12, so as to meet the requirement of the subsequent middle-side oven unit 12 on the drying temperature of the electrode sheet. In fig. 2, the gas heater 29 is disposed in the dual-stage return air organic gas recovery module 2, and optionally, the gas heater 29 may be disposed at the inlet of each oven or in the oven in this embodiment.
In order to facilitate the air flow circulation between the lithium battery cathode coating machine oven 1 and the two-stage air return organic gas recovery module 2 and prevent the NMP-containing gas from leaking into the working room, the micro-positive pressure in the lithium battery cathode coating machine oven 1 needs to be ensured. Therefore, the dual-stage return air organic gas recovery module 2 in the embodiments of the present invention further includes a centralized processing area 32, and the centralized processing area 32 is connected to the outlets of the first condensation recovery assembly and the second condensation recovery assembly, respectively. And discharging part of the condensed and recovered gas to a centralized treatment area through an air pipe, and discharging the gas to the atmosphere after purification treatment. It should be understood that the centralized processing area 32 is only a preferred embodiment, which is not a necessary feature of the present invention to solve the technical problems, and should not be construed as limiting the scope of the claims.
Further, in order to prevent a part of the liquid NMP generated during the heat exchange from being retained in the heat exchanger, the first heat exchanger 22 in the present embodiment is preferably installed in a manner inclined downward in the flow direction of the exhaust gas generated from the middle-side oven unit 12, but it should be understood that this arrangement also represents only a preferred embodiment, which is not a feature of the present invention necessary for solving the core technical problem, and should not be construed as limiting the scope of the claims.
The working flow and principle of the two-stage air return organic gas recovery system of the embodiment are as follows:
high-temperature high-concentration NMP gas (temperature: 150 ℃ C. NMP concentration 5850 ppm) generated by the middle side oven unit 12 enters a high-temperature section of a first heat exchanger 22 to carry out first heat exchange, and waste gas (temperature: 53 ℃ C. NMP concentration 2875.5 ppm) after heat exchange flows into a first condensation recovery component 23 to carry out first condensation recovery so as to condense the NMP solvent; a part of the gas recovered by the first condensation is introduced into the concentration treatment zone 32, purified and discharged to the atmosphere, and the other part of the gas (temperature: 40 ℃ C., NMP concentration 1327 ppm) is introduced into the adsorption zone 241 of the adsorption/desorption rotor 24 to further lower the NMP concentration of the gas returned to the oven, and the gas recovered by adsorption (temperature: 60 ℃ C., NMP concentration 380 ppm) is introduced into the gas heater 29 to be heated again and returned to the middle-side oven unit 12 again (temperature: 113 ℃ C., NMP concentration 380 ppm).
The high-temperature low-concentration NMP gas (temperature: 150 ℃ and NMP concentration 4960 ppm) generated by the head-side and/or tail-side oven unit 11 is directly introduced into the desorption zone 242 of the adsorption and desorption rotating wheel 24 as a regeneration heating source, under the action of the high temperature, the NMP gas adsorbed on the adsorption and desorption rotating wheel 24 is desorbed and concentrated, and is mixed with the high-temperature low-concentration NMP gas generated by the head-side and/or tail-side oven unit 11 to form regenerated gas (temperature: 81 ℃ and NMP concentration 5850 ppm), and the regenerated gas flows into the second condensation recovery component 27 for second condensation recovery so as to further condense the NMP solvent; a part of the gas recovered by the second condensation is introduced into the centralized treatment zone 32, purified and discharged into the atmosphere, and the other part of the exhaust gas (temperature: 21 ℃ C., NMP concentration 380 ppm) flows into the low-temperature pipe section of the first heat exchanger 22, undergoes the heat exchange with the high-temperature high-concentration NMP gas (temperature: 150 ℃ C., NMP concentration 5850 ppm) generated in the middle-side oven unit 12, then undergoes temperature rise, and is returned again to the head-side and/or tail-side oven units 11 (temperature: 125 ℃ C., NMP concentration 380 ppm) by the fans.
Fig. 3 is a schematic structural diagram of a second embodiment of the organic gas recycling system with two-stage return air, compared with the first embodiment, the main difference of this embodiment is that the gas heater 29 is not required in this embodiment, but a second heat exchanger 30 is disposed downstream of the adsorption region 241 and upstream of the desorption region 242 of the adsorption and desorption runner 24, a high-temperature pipe section of the second heat exchanger 30 is disposed between the second gas flow inlet 26 and the desorption region 242, and a low-temperature pipe section of the second heat exchanger 30 is disposed between the adsorption region 241 and the first gas flow outlet 25.
Specifically, when the high-temperature high-concentration NMP gas (temperature: 150 ℃ C., NMP concentration 5850 ppm) generated in the middle oven unit 12 enters the high-temperature section of the first heat exchanger 22 to undergo first heat exchange, the gas (temperature: 53 ℃ C., NMP concentration 2875.5 ppm) after the heat exchange flows into the first condensate recovery module 23 to undergo first condensate recovery to condense the NMP solvent; a part of the gas recovered by the first condensation is introduced into a concentration treatment zone 32, purified and discharged to the atmosphere, and the other part of the gas (temperature: 40 ℃ C., NMP concentration 1327 ppm) is introduced into an adsorption zone 241 of an adsorption/desorption rotor 24 to further reduce the NMP concentration of the gas returned to the oven, and the gas recovered by adsorption (temperature: 60 ℃ C., NMP concentration 380 ppm) is introduced into a low-temperature tube section of a second heat exchanger 30, heated by heat exchange with a high-temperature low-concentration NMP gas (temperature: 150 ℃ C., NMP concentration 4960 ppm) generated in a head-side and/or tail-side oven unit 11, and returned to the middle-side oven unit 12 again (temperature: 113 ℃ C., NMP concentration 380 ppm).
The high-temperature low-concentration NMP gas (the temperature is 150 ℃ and the NMP concentration is 4960 ppm) generated by the head-side and/or tail-side oven units 11 is introduced into the high-temperature pipe section of the second heat exchanger 30, is directly introduced into the desorption zone 242 of the absorption and desorption rotating wheel 24 as a regeneration heating source (the temperature is 100 ℃ and the NMP concentration is 4960 ppm) after being subjected to heat exchange with the gas (the temperature is 60 ℃ and the NMP concentration is 380 ppm) absorbed and recovered by the middle-side oven unit 12, is desorbed and concentrated under the high-temperature action of the NMP gas, is mixed with the high-temperature low-concentration NMP gas generated by the head-side and/or tail-side oven units 11 to form regenerated gas (the temperature is 81.2 ℃ and the NMP concentration is 5850 ppm), and flows into the second condensation recovery component 27 to perform second condensation recovery so as to further condense the NMP solvent; a part of the gas recovered by the second condensation is introduced into the centralized treatment zone 32, purified and discharged to the atmosphere, and the other part of the exhaust gas (temperature: 21 ℃ C., NMP concentration 380 ppm) flows into the low-temperature section of the first heat exchanger 22, undergoes the first heat exchange with the high-temperature high-concentration NMP gas (temperature: 150 ℃ C., NMP concentration 5850 ppm) generated in the middle-side oven unit 12, then undergoes a temperature rise, and is returned again to the head-side and/or tail-side oven units 11 (temperature: 125 ℃ C., NMP concentration 380 ppm) by the fans.
In this embodiment, the low-temperature gas adsorbed by the middle-side oven unit 12 exchanges heat with the high-temperature gas generated by the head-side and/or tail-side oven unit 11, and it is not necessary to provide an additional gas heater for the gas returning to the oven and to perform subsequent gas heating operation.
Fig. 4 is a schematic structural diagram of a third embodiment of the organic gas two-stage return air recovery system according to the present invention, which is different from the second embodiment in the heat exchange manner of the adsorbed gas. Unlike the second embodiment in which the second heat exchanger 30 is disposed downstream of the adsorption region 241 and upstream of the desorption region 242 of the adsorption/desorption rotor 24, and the low-temperature gas adsorbed by the middle-side oven unit 12 exchanges heat with the high-temperature gas generated by the head-side and/or tail-side oven unit 11, in the present embodiment, a third heat exchanger 31 is disposed downstream of the adsorption region 241 of the adsorption/desorption rotor 24 and upstream of the high-temperature tube section of the first heat exchanger, and the high-temperature tube section of the third heat exchanger 31 is disposed between the first gas flow inlet and the inlet of the high-temperature tube section of the first heat exchanger; the low temperature pipe section of the third heat exchanger 31 is disposed between the adsorption region 241 and the first gas flow outlet 25, that is: the low-temperature gas adsorbed by the middle-side oven unit 12 is heat-exchanged with the high-temperature gas generated by the middle-side oven unit 12 before entering the first heat exchanger 22 and then returned to the oven.
Specifically, when the high-temperature high-concentration NMP gas (temperature: 150 ℃ and NMP concentration 5850 ppm) generated by the middle-side oven unit 12 enters the high-temperature section of the third heat exchanger 31 to carry out third heat exchange, the gas (temperature: 89.8 ℃ and NMP concentration 5850 ppm) after heat exchange directly enters the high-temperature section of the first heat exchanger 22 to carry out first heat exchange, and the gas (temperature: 79.5 ℃ and NMP concentration 2746 ppm) after heat exchange flows into the first condensation recovery component 23 to carry out first condensation recovery so as to condense the NMP solvent; a part of the gas recovered by the first condensation is introduced into a concentration treatment zone 32, purified and discharged to the atmosphere, and the other part of the gas (temperature: 40 ℃ C., NMP concentration 1327 ppm) is introduced into an adsorption zone 241 of an adsorption/desorption rotor 24 to further reduce the NMP concentration of the gas returned to the oven, and the gas (temperature: 61 ℃ C., NMP concentration 360 ppm) recovered by adsorption is introduced into a low-temperature tube section of a third heat exchanger 31, heated by heat exchange with a high-temperature high-concentration NMP gas (temperature: 150 ℃ C., NMP concentration 5850 ppm) generated in the middle-side oven unit 12, and returned to the middle-side oven unit 12 again (temperature: 125 ℃ C., NMP concentration 360 ppm).
The high-temperature low-concentration NMP gas (temperature: 150 ℃ and NMP concentration 650 ppm) generated by the head-side and/or tail-side oven unit 11 is directly introduced into the desorption region 242 of the adsorption and desorption rotating wheel 24 as a regeneration heating source, under the action of the high temperature, the NMP gas adsorbed on the adsorption and desorption rotating wheel 24 is desorbed and concentrated, and is mixed with the high-temperature low-concentration NMP gas generated by the head-side and/or tail-side oven unit 11 to form regenerated gas (temperature: 51.3 ℃ and NMP concentration 5159 ppm), and the regenerated gas flows into the second condensation recovery assembly 27 for second condensation recovery so as to further condense the NMP solvent; a part of the gas recovered by the second condensation is introduced into the centralized treatment zone 32, purified and discharged to the atmosphere, and the other part of the exhaust gas (temperature: 21 ℃ C., NMP concentration 380 ppm) flows into the low-temperature section of the first heat exchanger 22, undergoes the first heat exchange with the high-temperature high-concentration NMP gas (temperature: 89.8 ℃ C., NMP concentration 5850 ppm) generated in the middle-side oven unit 12, then undergoes a temperature rise, and is returned again to the head-side and/or tail-side oven unit 11 (temperature: 76.1 ℃ C., NMP concentration 380 ppm) by the fan.
In this embodiment, the low-temperature gas absorbed by the middle-side oven unit 12 and the high-temperature gas generated by the middle-side oven unit 12 before entering the first heat exchanger 22 are subjected to heat exchange and then returned to the oven, and similarly, it is not necessary to provide an additional gas heater for the gas returned to the oven and to perform subsequent gas heating operation.
Fig. 5 is a schematic structural diagram of a fourth embodiment of the two-stage return-air organic gas recovery system according to the present invention, in which only the adsorption area 241 and the desorption area 242 are present on the first, second, and third absorbing/desorbing wheels 24, the temperature of the absorbing/desorbing wheel 24 rises rapidly after the high-temperature and low-concentration NMP gas generated by the head-side and/or tail-side oven units 11 acts on the desorption area 242, and the temperature rise of the absorbing/desorbing wheel 24 is not favorable for the adsorption of the NMP gas by the adsorption area 241, so that the main difference of this embodiment is that a cooling area 243 is additionally disposed on the absorbing/desorbing wheel 24, as compared with the first and second embodiments. The cooling zone is disposed between the adsorption zone 241 and the desorption zone 242, the inlet of the cooling zone 243 is connected with the outlet of the adsorption zone 241, the outlet of the cooling zone 243 is connected with the inlet of the adsorption zone 241, that is: after the low-temperature gas adsorbed by the adsorption area 241 is introduced into the cooling area 243 to cool the rotating wheel, the gas returns to the adsorption area 241 again to enter an adsorption cycle, so that the NMP gas adsorption efficiency is effectively improved.
In addition, in order to further improve the adsorption efficiency of the adsorption and desorption rotor 24 on the NMP gas, the adsorption and desorption rotor 24 in the first, second and third embodiments of the present invention may further be provided with at least two adsorption zones 241, the gas generated from the middle oven unit 12 and recovered by the first condensation is sequentially subjected to at least two times of gas adsorption through the at least two adsorption zones, and after the above two times of adsorption, the NMP concentration returned to the oven is lower than 200ppm, further improving the adsorption efficiency of the system.
In each specific implementation process of the invention, the production device for coating the lithium battery is preferably arranged to be a multilayer structure, each layer is preferably provided with 12 sections of drying ovens, and every six sections of drying ovens use one double-stage air return organic gas recovery system of the invention, specifically, the 1 st, 2 nd and 3 rd sections of each layer of drying ovens are head side drying oven units, the 10 th, 11 th and 12 th sections of drying ovens are tail side drying oven units, and high-temperature waste gas (namely, second waste gas of the invention) discharged by the two sections of drying ovens is used for desorbing and regenerating the adsorbed first waste gas (shown in figures 2, 3 and 5) generated by the 4 th, 5 th and 6 th drying ovens (namely, middle side drying oven units) and the 7 th, 8 th and 9 th ovens (namely, middle side drying oven units) respectively because the concentration of NMP is relatively low; in addition, in other embodiments of the present invention, low-concentration high-temperature exhaust gas generated by one head-side or tail-side oven can be used as a regenerative heating source to provide desorption regenerative heating for the exhaust gas generated and adsorbed by the other five ovens (as shown in fig. 4). It should be understood that the description of the number of production device layers, the number of sections, the number of head-side and/or tail-side oven units and the number of middle-side oven units in the present invention is only an exemplary description, and should not be construed as limiting the scope of the claims, and those skilled in the art can set any number of production device layers, sections, head-side and/or tail-side oven units and middle-side oven units according to actual needs.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.
Claims (20)
1. A double-stage air return organic gas recovery method is characterized by comprising the following steps:
i) a step of subjecting the first off-gas from the partial production unit to first heat exchange;
ii) a step of subjecting the first off-gas after the first heat exchange to a first condensation recovery;
iii) a step of subjecting at least a part of the first off-gas recovered by the first condensation to adsorption recovery;
iv) a step of heating the first waste gas after adsorption recovery for the second time to produce the first-stage return air and returning the first-stage return air to the production device;
v) a step of regenerating and desorbing the first off-gas recovered by adsorption from the second off-gas from the other part of the production apparatus to produce a regenerated gas;
vi) subjecting said regenerated gas to a second condensation recovery step;
vii) a step of subjecting at least part of the regenerated gas recovered by the second condensation to the first heat exchange with the first off-gas;
viii) a step of returning at least a portion of the regenerated gas after the first heat exchange to the production unit to produce a second stage return air.
2. The dual-stage air return organic gas recovery method of claim 1, wherein in the step iv), the second heating is an operation of directly heating the first exhaust gas after adsorption recovery by a gas heater.
3. The dual stage blow-back organic gas recovery method of claim 1, wherein in step iv), the second heating is performed by second heat exchange between the first exhaust gas after adsorption recovery and the second exhaust gas before the desorption step.
4. The dual-stage air return organic gas recovery method of claim 1, wherein in the step iv), the second heating is performed by performing third heat exchange operation on the first exhaust gas after adsorption recovery and the first exhaust gas before participating in the first heat exchange step of the step i).
5. The dual-stage air return organic gas recovery method of any one of claims 1 to 4, wherein in the step iii), part of the first exhaust gas after the first condensation recovery is subjected to adsorption recovery, and the other part of the first exhaust gas is subjected to centralized treatment and purification and then is discharged to the atmosphere.
6. The dual-stage air returning organic gas recovery method as claimed in any one of claims 1 to 4, wherein in step vii), part of the regenerated gas after the second condensation recovery is subjected to the first heat exchange with the first exhaust gas, and the other part of the regenerated gas is subjected to centralized treatment and purification and then discharged to the atmosphere.
7. A dual stage return air organic gas recovery module comprising:
a first gas flow inlet;
a first heat exchanger;
a first condensate recovery assembly;
it is characterized by also comprising:
the adsorption and desorption component at least comprises an adsorption area and a desorption area;
a first airflow outlet;
a first warming component;
the adsorption area, the first temperature raising component and the first airflow outlet are sequentially connected through an air circuit to form a first-stage air return circulation of first waste gas;
a second gas flow inlet;
a second condensate recovery assembly;
a second gas flow outlet;
the second airflow inlet, the desorption area, the second condensation recovery assembly, the first heat exchanger and the second airflow outlet are sequentially connected to form a second-stage air return circulation of the second waste gas.
8. The dual stage return air organic gas recovery module of claim 7, wherein the first temperature increasing assembly is a gas heater.
9. The dual-stage return air organic gas recovery module of claim 7, wherein the first temperature raising assembly is a second heat exchanger, a high temperature tube section of the second heat exchanger is disposed between the second gas flow inlet and the desorption zone, and a low temperature tube section of the second heat exchanger is disposed between the adsorption zone and the first gas flow outlet.
10. The dual stage blow-back organic gas recovery module of claim 7, wherein the first temperature raising assembly is a third heat exchanger, the high temperature section of the third heat exchanger being disposed between the first gas stream inlet and the first heat exchanger high temperature section inlet; the low temperature tube section of the third heat exchanger is disposed between the adsorption zone and the first gas flow outlet.
11. The dual stage return air organic gas recovery module of claim 7, further comprising a centralized processing area connected to the first and second condensate recovery module outlets, respectively.
12. The dual stage return air organic gas recovery module of claim 7, wherein the first heat exchanger is angled downwardly in the first exhaust gas flow direction.
13. The dual stage return air organic gas recovery module of claim 7, wherein the first condensate recovery component is a chilled water coil or a chilled water coil.
14. The dual-stage air return organic gas recovery module of claim 7 or 13, wherein the second condensate recovery module comprises a first condensate recovery device and a second condensate recovery device, wherein the first condensate recovery device is a cooling water coil, and the second condensate recovery device is a chilled water coil.
15. The dual stage blow-back organic gas recovery module of claim 7 wherein the adsorption and desorption components are molecular sieve adsorption and desorption wheels.
16. The dual stage blow-back organic gas recovery module of claim 15, wherein the adsorption and desorption rotor further comprises a cooling zone, the cooling zone inlet is in gas communication with the adsorption zone outlet, and the cooling zone outlet is in gas communication with the adsorption zone inlet.
17. The dual stage return air organic gas recovery module of claim 15, wherein the number of adsorption zones is at least two.
18. A two-stage air return organic gas recovery system is characterized by comprising:
a production device;
and a dual stage return air organic gas recovery module as claimed in any one of claims 7-17 in gas communication with said production facility;
wherein the production device comprises a first production device unit and a second production device unit;
the first production device unit generates first waste gas and comprises a first production device unit airflow outlet and a first production device unit airflow inlet, the first production device unit airflow outlet is connected with the first airflow inlet air path, and the first production device unit airflow inlet is connected with the first airflow outlet air path;
the second production device unit generates second waste gas and comprises a second production device unit airflow outlet and a second production device unit airflow inlet, the second production device unit airflow outlet is connected with the second airflow inlet through a gas circuit, and the second production device unit airflow inlet is connected with the second airflow outlet through a gas circuit.
19. The dual stage return air organic gas recovery system of claim 18, wherein the production device is a lithium battery cathode coater oven or a printing, semiconductor, adhesive tape manufacturing environment device.
20. The dual stage return air organic gas recovery system of claim 18, wherein the production device is a lithium battery cathode coater oven production line, wherein the first production device unit is at least one oven on a middle side of the production line; the second production device unit is at least one section of oven at the head side and/or the tail side of the production line.
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