CN114225641B - Double-stage air-supply and return organic gas recovery method, recovery module and recovery system - Google Patents
Double-stage air-supply and return organic gas recovery method, recovery module and recovery system Download PDFInfo
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- CN114225641B CN114225641B CN202111566429.3A CN202111566429A CN114225641B CN 114225641 B CN114225641 B CN 114225641B CN 202111566429 A CN202111566429 A CN 202111566429A CN 114225641 B CN114225641 B CN 114225641B
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/00—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
- B01D53/002—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 condensation
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- B01D53/00—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
- 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 two-stage air supply and return organic gas recovery method, a module and a system, which comprise two-stage air supply and return gas 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 desorb and regenerate the organic gas adsorbed on a rotating wheel, and returns to the machine head side and/or the machine tail side oven unit after condensation recovery and heat exchange; and the high-temperature high-concentration organic gas generated by the second cyclic utilization middle side oven unit is returned to the middle side oven after heat exchange, condensation recovery, adsorption and secondary heating. The whole method, the module and the system fully utilize the heat energy exchange, ensure the full condensation and recovery of the organic solvent, save energy, have high efficiency and low cost, and are favorable for industrial popularization.
Description
Technical Field
The invention relates to a two-stage air supply and return organic gas recovery method, a recovery module and a recovery system, in particular to a method, a module device and a system for realizing efficient recovery of organic gas and efficient utilization of heat energy by combining two-stage air supply and return circulation with an adsorption and desorption assembly.
Background
In the production process of lithium batteries, coating is a very important step, equipment mainly used in the step is a coating machine, an oven is used as a part of the most important part of the coating machine, the coating machine comprises a plurality of oven units, each oven unit is mutually communicated into a whole, a coated substrate advances in the oven in the same direction, the coated substrate is continuously baked by high temperature in each oven unit in the advancing process, the process of coating and drying a positive electrode plate of a lithium battery is accompanied by the generation of high-temperature N-methylpyrrolidone (NMP) waste gas, in the production line of the oven of the cathode coating machine of the lithium batteries, the high-temperature waste gas with lower NMP concentration is discharged from an oven at the machine head side (or the machine tail side), and the waste gas with high NMP concentration is discharged from an oven at the middle side, because NMP is expensive and harmful gas is generated in the atmosphere, so that the NMP is fully recycled and utilized is an important point of research in the field.
Fig. 1 shows an NMP recovery system in the prior art, which includes an oven 1000, a gas heat exchange recovery module 2000 and a rotating 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 rotating wheel adsorption regeneration module 3000 includes an adsorption zone 3001, a cooling zone 3002 and a regeneration zone 3003, wherein the gas generated in the oven 1000 enters from the high temperature side of the heat exchanger 2001, and after being condensed and recovered by the condensation recovery device 2002, a part of the gas returns to the low temperature side of the heat exchanger 2001, and returns to the oven 1000 again after heat exchange with the high temperature exhaust gas newly flowing into the high temperature side of the heat exchanger 2001; and the other part of the gas after condensation and recovery enters the rotating wheel regeneration module 3000, after re-adsorption in the adsorption zone 3001, part of the gas is discharged into the atmosphere, the other part of the gas flows into the cooling zone 3002 and then acts on the regeneration zone 3003 through secondary heating to generate regenerated concentrated NMP gas, and the regenerated concentrated NMP gas is discharged into the atmosphere after condensation and recovery again.
However, in this solution, according to the different lengths of the production line of the oven 1000, several groups of gas heat exchange recovery modules 2000 are required, each group is provided with a heat exchanger 2001 and a condensation recovery device 2002, the condensation recovery device needs to continuously circulate and introduce a refrigerant, and the rotating wheel adsorption regeneration module 3000 is added, so that the overall manufacturing cost of the system is relatively high, and the heat energy of the whole system is not fully utilized, so that the energy consumption cost is high.
Disclosure of Invention
In view of the fact that the prior art cannot meet the requirements of users on reducing the manufacturing cost and the energy consumption cost of the organic gas recovery system at the same time, the main purpose of the invention is to provide the organic solvent recovery system which meets the demands of clients and markets and can fully utilize heat energy, and the energy consumption and the manufacturing cost of the system are reduced to the maximum extent.
In order to achieve the above object, the present invention provides in a first aspect a two-stage return air organic gas recovery method, comprising the steps of:
i) A step of performing a first heat exchange by passing the first offgas from the partial production plant to a high Wen Guanduan of the first heat exchanger;
ii) a step of first condensing and recovering the first waste gas after the first heat exchange;
iii) A step of adsorbing and recovering at least part of the first waste gas after the first condensation and recovery;
iv) a step of secondarily heating the first waste gas after adsorption recovery to generate first-stage return air and returning the first-stage return air to the production device;
v) regenerating the desorbed first offgas from the other part of the production plant as a heating source to produce a regenerated gas containing at least the second offgas and at least part of the adsorbed recovered first offgas recovered after concentration and desorption;
vi) subjecting the 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 said first heat exchange with said first offgas of high Wen Guanduan entering the first heat exchanger in a low temperature pipe section of the first heat exchanger;
viii) returning at least part of the regenerated gas after the first heat exchange to the production unit to produce a second stage return air.
Alternatively, in step iv), the secondary heating is an operation of directly heating the first offgas after adsorption recovery by a gas heater.
Optionally, in step iv), the secondary heating is an operation of performing a second heat exchange between the first exhaust gas after adsorption recovery and the second exhaust gas before the desorption step.
Optionally, in step iv), the secondary heating is an operation of performing a third heat exchange between the first exhaust gas after adsorption recovery and the first exhaust gas before the first heat exchange step in step i).
In step iii), part of the first waste gas after the first condensation recovery is adsorbed and recovered, and the other part of the first waste gas is discharged to the atmosphere after the centralized treatment and purification.
In step vii), the part of the regenerated gas after the second condensation and recovery is subjected to the first heat exchange with the first waste gas, and the other part of the regenerated gas is discharged to the atmosphere after being concentrated and purified.
The present invention provides in a first aspect a dual stage return air organic gas recovery module comprising:
a first gas stream inlet;
a first heat exchanger;
a first condensate recovery assembly;
further comprises:
the adsorption and desorption assembly at least comprises an adsorption area and a desorption area;
a first air flow outlet;
a first temperature increasing component;
the first air flow inlet, the first heat exchanger height Wen Guanduan, the first condensation recovery assembly, the adsorption zone, the first heating assembly and the first air flow outlet are sequentially connected through air paths to form a first-stage air supply and return circulation of first waste gas;
a second airflow inlet;
a second condensate recovery assembly;
a second airflow outlet;
the second air inlet, the desorption area, the second condensation recovery assembly, the first heat exchanger low-temperature pipe section and the second air outlet are sequentially connected to form a second-stage air supply and return circulation of second waste gas, wherein the second waste gas acts on the desorption area to serve as a regeneration gas heating source.
Optionally, the first temperature raising component is a gas heater.
Optionally, the first temperature raising component is a second heat exchanger, a height Wen Guanduan of the second heat exchanger is disposed between the second airflow inlet and the desorption region, and a low-temperature tube section of the second heat exchanger is disposed between the adsorption region and the first airflow outlet.
Optionally, the first temperature raising component is a third heat exchanger, a height Wen Guanduan of the third heat exchanger being disposed between the first air flow inlet and a height Wen Guanduan inlet of the first heat exchanger; the low-temperature pipe section of the third heat exchanger is arranged between the adsorption zone and the first air outflow port.
Further, the device also comprises a centralized treatment area which is respectively connected with the first condensation recovery assembly outlet and the second condensation recovery assembly outlet.
Preferably, the first heat exchanger is disposed obliquely 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 condensation recovery device and a second condensation recovery device, wherein the first 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 zone, wherein the inlet of the cooling zone is connected with the gas circuit of the outlet of the adsorption zone, and the outlet of the cooling zone is connected with the gas circuit of the inlet of the adsorption zone.
Alternatively, the number of the adsorption areas is at least two.
The present invention provides in a third aspect a dual stage return air organic gas recovery system comprising:
a production device;
the two-stage air supply and return organic gas recovery module is connected with the production device air circuit;
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 air flow outlet and a first production device unit air flow inlet, the first production device unit air flow outlet is connected with the first air flow inlet air circuit, and the first production device unit air flow inlet is connected with the first air flow outlet air circuit;
the second production device unit generates second waste gas and comprises a second production device unit air flow outlet and a second production device unit air flow inlet, the second production device unit air flow outlet is connected with the second air flow inlet air circuit, and the second production device unit air flow inlet is connected with the second air flow outlet air circuit.
Preferably, the production device is a lithium battery cathode coater 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 oven at the middle side of the production line; the second production device unit is at least one section of oven at the machine head side and/or the machine tail side of the production line.
Based on the design, the invention has the beneficial effects that: firstly, by adopting the two-stage air supply and return organic gas recovery system, on one hand, high-temperature organic gas generated by a plurality of sections of ovens at the machine head side and/or the machine tail side is used as a regeneration gas heating source to regenerate and desorb the organic gas of the ovens at the middle side, which is adsorbed on the rotating wheel and is subjected to heat exchange, condensation and recovery; on the other hand, the regenerated gas is subjected to heat exchange with high-temperature organic gas generated by the middle side oven after condensation and recovery, so that the whole system fully utilizes the heat energy of each section of oven and 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 up to six sections of oven units, and 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, a second heat exchanger can be arranged at the upstream of the regeneration zone, and the low-temperature gas absorbed by the middle side oven is subjected to heat exchange with the high-temperature gas generated at the machine head side and/or the machine tail side, so that the heat energy utilization of the system is improved, the gas returned to the oven is not required to be subjected to additional heating operation, the energy consumption of the system is further reduced, and the cost is saved; fourth, the first heat exchanger of the invention is arranged obliquely downwards along the flow direction of the first waste gas, so that partial liquid NMP generated in the heat exchange process can be prevented from being retained in the heat exchanger; fifth, the invention is also provided with a centralized treatment area connected with the outlet of the first condensation recovery assembly and the outlet of the second condensation recovery assembly, which can ensure that the oven is kept in a micro negative pressure state; sixth, the rotating wheel provided by the invention is provided with the cooling zone and/or the plurality of adsorption zones, so that the adsorption effect and adsorption efficiency of the rotating wheel can be improved as much as possible. In conclusion, the invention can maximally reduce the manufacturing cost of the system, 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 market application.
Drawings
FIG. 1 is a schematic diagram of the structural principle of an NMP recovery system in the prior art;
FIG. 2 is a schematic diagram of the construction of a first embodiment of a dual stage return air organic gas recovery module and system of the present invention;
FIG. 3 is a schematic diagram of the construction of a second embodiment of a dual stage return air organic gas recovery module and system of the present invention;
FIG. 4 is a schematic diagram of the construction of a third embodiment of a dual stage return air organic gas recovery module and system according to the present invention;
fig. 5 is a schematic structural diagram of a two-stage return air organic gas recovery module and system according to a fourth embodiment of the present invention.
1. Drying oven of lithium battery cathode coating machine; 11. a head side and/or tail side oven unit; 12. a middle side oven unit; 2. a two-stage return air organic gas recovery module; 21. a first gas stream 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 air flow outlet; 26. a second airflow inlet; 27. a second condensate recovery assembly; 28. a second airflow 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 rotating wheel adsorption regeneration module; 3001. an adsorption zone; 3002. a cooling zone; 3003. a regeneration zone.
Description of the embodiments
In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions 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 understood that these embodiments are not intended to limit the present invention, and that functional, method, or structural equivalents and alternatives falling within the scope of the present invention may be modified by any person skilled in the art to include such embodiments.
Meanwhile, in the present specification, references to the description of the orientation such as upper, lower, left, right, front, rear, inner, outer, longitudinal, lateral, vertical, horizontal, etc., are based on the orientation or positional relationship shown in the drawings, only for convenience of description and simplification of the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements. It will be understood by those of ordinary skill in the art that the specific meaning of the terms above in the present invention should not be construed as limiting the invention as the case may be.
For convenience of description, the preferred embodiments of the present invention select the lithium battery cathode coater oven as the production device, and focus on the NMP efficient recovery and heat energy utilization principle between the lithium battery cathode coater oven and the two-stage return air organic gas recovery module, 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, the adsorbed organic gas should not be limited to NMP gas, and any production device involving high temperature organic gas recovery in production, such as: printing, semiconductor, adhesive tape manufacturing apparatus, which should not be construed as limiting the scope of protection of the production apparatus in the claims, can be used in combination with the dual stage return air organic gas recovery module of the present invention.
Fig. 2 is a schematic structural diagram of a first embodiment of a dual-stage return air organic gas recovery system according to the present invention, where the dual-stage return air organic gas recovery system includes: the lithium battery cathode coater oven 1 comprises a machine head side and/or machine tail side oven unit 11 and a middle side oven unit 12, wherein the volatilization amount of NMP at the machine head side is small due to the fact that the temperature of a pole piece at the machine head side is low, the NMP concentration at the machine tail side is low, the volatilization amount is also small, the machine head side and/or machine tail side oven unit discharges waste gas with high temperature and low NMP concentration, the middle side oven unit discharges waste gas with high temperature and high NMP concentration, and the two-stage air feed-back organic gas recovery module 2 comprises a first air flow inlet 21, a first heat exchanger 22, a first condensation recovery assembly 23, an absorption and desorption runner 24, a first air flow outlet 25, a second air flow inlet 26, a second condensation recovery assembly 27 and a second air flow outlet 28. Wherein the adsorption/desorption rotating wheel 24 further comprises an adsorption area 241 and a desorption area 242, and the above elements form a two-stage organic gas recovery air supply/return circulation path of the two-stage air supply/return organic gas recovery module 2, and the first air inlet 21, the first heat exchanger 22, the first condensation recovery assembly 23, the adsorption area 241 of the adsorption/desorption rotating wheel 24 and the first air outlet 25 are sequentially connected in an air path, so as to jointly form a first-stage organic gas recovery air supply/return circulation; the second air inlet 26, the desorption region 242 of the adsorption and desorption runner 24, the second condensation recovery assembly 27, the first heat exchanger 22, and the second air outlet 28 are sequentially connected in an air path, so as to form a second-stage organic gas recovery air supply and return circulation. 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 NMP gas is lower, so that the high-temperature exhaust gas generated from the head side and/or tail side oven unit 11 flows into the two-stage return air organic gas recovery module 2 through the second air flow inlet 26 and acts as a regeneration gas heating source on the desorption area 242 of the adsorption and desorption rotating wheel 24, and the organic solvent adsorbed on the adsorption and desorption rotating wheel 24 is concentrated and desorbed to generate regenerated gas; while the high temperature exhaust gas from the intermediate side oven unit 12 flows into the two-stage return air organic gas recovery module 2 through the first air inlet 21 and enters the subsequent heat exchange, condensation recovery and runner 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 intermediate side oven unit 12 that is concentrated and desorbed to recover the gas state and is at least partially adsorbed by the adsorption zone 241. The heat exchanger 201 of the present invention is preferably a plate heat exchanger and is arranged in a diamond shape, but any other type of heat exchanger that can perform heat exchange function, such as a heat pipe heat exchanger and an adaptive fixed installation manner thereof, should be covered in the protection scope of the present invention; the first condensation recovery assembly of the present invention is preferably a cooling water coil and the second condensation recovery assembly is preferably a combination of cooling water coils and chilled water coils, but it should be understood that the type and combination of elements selected for the first and second condensation recovery assemblies are merely representative of preferred embodiments, insofar as the elements and combinations are capable of condensation recovery, such as: the first condensation recovery unit is a cooling water coil or a chilled water coil, the first condensation recovery unit is a cooling water coil, and the second condensation recovery unit is a chilled water coil, which are all included in the protection scope of the present invention. In addition, although the molecular sieve adsorption/desorption rotors are used in the embodiments of the present invention, it should be understood that the adsorption/desorption rotors are only representative of the preferred embodiments, and should not be construed as limiting the scope of the claims, and any adsorption/desorption component capable of achieving adsorption/desorption, such as a porous adsorption material, should be included in the scope of the present invention.
Since the NMP waste gas generated by the middle side oven unit 12 is subjected to heat exchange by the first heat exchanger 22, condensation recovery by the first condensation recovery component 23 and adsorption by the adsorption region 241 of the adsorption-desorption runner 24, and the temperature is significantly reduced, in order to meet the drying temperature requirement, in this embodiment, a gas heater 29 is disposed downstream of the adsorption region 241, and the adsorbed gas is subjected to secondary heating and returned to the middle side oven unit 12, so as to meet the drying temperature requirement of the subsequent middle side oven unit 12 on the electrode sheet. In fig. 2, the gas heater 29 is disposed in the dual stage return air organic gas recovery module 2, alternatively, 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 circulation of air flow between the lithium battery cathode coater oven 1 and the two-stage return air organic gas recovery module 2 and prevent NMP-containing gas from leaking into the working room, it is necessary to ensure a slight positive pressure in the lithium battery cathode coater oven 1. Thus, the dual stage return air organic gas recovery module 2 of the various embodiments of the present invention further includes a centralized processing zone 32, the centralized processing zone 32 being connected to the first and second condensate recovery module outlets, respectively. Part of the condensed and recovered gas is discharged to a centralized treatment area through the outside of the air pipe, purified and then discharged to the atmosphere. It should be understood that the centralized processing area 32 is merely representative of a preferred embodiment, and is not an essential feature of the present invention to solve the technical problem, but is not to be construed as limiting the scope of the claims.
In addition, 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 to be 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 technical feature of the present invention necessary for solving the core technical problem, and should not be construed as limiting the scope of protection of the claims.
The working flow and principle of the two-stage air supply and return organic gas recovery system of the embodiment are approximately as follows:
the high-temperature high-concentration NMP gas (temperature: 150 ℃ NMP concentration: 5850 ppm) generated by the middle side oven unit 12 enters a high-temperature tube section of the first heat exchanger 22 to perform first heat exchange, and the waste gas (temperature: 53 ℃ NMP concentration: 2875.5 ppm) after the heat exchange flows into the first condensation recovery assembly 23 to perform first condensation recovery to condense NMP solvent; a part of the gas recovered by the first condensation is introduced into the concentrated treatment zone 32, purified and then discharged to the atmosphere, and the other part of the gas (temperature: 40 ℃ C., NMP concentration: 1327 ppm) flows into the adsorption zone 241 of the adsorption/desorption wheel 24 to further reduce the NMP concentration of the gas returned to the oven, and the gas recovered by the adsorption (temperature: 60 ℃ C., NMP concentration: 380 ppm) is heated again by the introduction gas heater 29 and then returned to the intermediate side oven unit 12 (temperature: 113 ℃ C., NMP concentration: 380 ppm).
The high temperature low concentration NMP gas (temperature: 150 ℃ C., 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/desorption wheel 24 as a regeneration heating source, under the high temperature effect thereof, the NMP gas adsorbed on the adsorption/desorption wheel 24 is desorbed and concentrated, and mixed with the high temperature low concentration NMP gas generated by the head side and/or tail side oven unit 11 to form a regenerated gas (temperature: 81 ℃ C., NMP concentration: 5850 ppm), and flows into the second condensation recovery assembly 27 for second condensation recovery to further condense NMP solvent; part of the gas recovered by the second condensation is introduced into the concentrated treatment zone 32, purified and then discharged to the atmosphere, and the other part of the waste gas (temperature: 21 ℃ C., NMP concentration: 380 ppm) flows into the low-temperature tube section of the first heat exchanger 22, and after the heat exchange with the high-temperature high-concentration NMP gas (temperature: 150 ℃ C., NMP concentration: 5850 ppm) generated by the intermediate side oven unit 12, the temperature rises, and the waste gas is returned to the head side and/or tail side oven unit 11 (temperature: 125 ℃ C., NMP concentration: 380 ppm) again by a fan.
Fig. 3 is a schematic structural diagram of a second embodiment of the two-stage return air organic gas recovery system according to the present invention, and compared with the first embodiment, the main difference of the present embodiment is that the gas heater 29 is not required, but a second heat exchanger 30 is disposed downstream of the adsorption zone 241 and upstream of the desorption zone 242 of the adsorption/desorption wheel 24, the height Wen Guanduan of the second heat exchanger 30 is disposed between the second air flow inlet 26 and the desorption zone 242, and the low-temperature tube section of the second heat exchanger 30 is disposed between the adsorption zone 241 and the first air flow outlet 25.
Specifically, when the high-temperature high-concentration NMP gas (temperature: 150 ℃, NMP concentration: 5850 ppm) generated in the intermediate side oven unit 12 enters the high-temperature tube section of the first heat exchanger 22 to perform the first heat exchange, the heat exchanged gas (temperature: 53 ℃, NMP concentration: 2875.5 ppm) flows into the first condensation recovery assembly 23 to perform the first condensation recovery to condense the NMP solvent; a part of the gas recovered by the first condensation is introduced into the concentrated treatment zone 32, purified and then discharged to the atmosphere, and the other part of the gas (temperature: 40 ℃ C., NMP concentration: 1327 ppm) flows into the adsorption zone 241 of the adsorption/desorption wheel 24 to further reduce the NMP concentration of the gas returned to the oven, and the gas recovered by the adsorption (temperature: 60 ℃ C., NMP concentration: 380 ppm) is introduced into the low-temperature tube section of the second heat exchanger 30, and is returned to the intermediate-side oven unit 12 (temperature: 113 ℃ C., NMP concentration: 380 ppm) again after being heated by heat exchange with the high-temperature low-concentration NMP gas (temperature: 150 ℃ C., NMP concentration: 4960 ppm) generated by the head-side and/or tail-side oven unit 11.
The high-temperature low-concentration NMP gas (temperature: 150 ℃ C., NMP concentration: 4960 ppm) generated by the head-side and/or tail-side oven unit 11 is introduced into the high-temperature tube section of the second heat exchanger 30, and the gas (temperature: 60 ℃ C., NMP concentration: 380 ppm) after being adsorbed and recovered by the middle-side oven unit 12 is directly introduced into the desorption zone 242 of the adsorption/desorption wheel 24 as a regeneration heating source (temperature: 100 ℃ C., NMP concentration: 4960 ppm) after being cooled by heat exchange, and the NMP gas adsorbed on the adsorption/desorption wheel 24 is desorbed and concentrated under the action of the high temperature, 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: 81.2 ℃ C., NMP concentration: 5850 ppm) and flows into the second condensation recovery component 27 for further condensation of NMP solvent; part of the gas recovered by the second condensation is introduced into the concentrated treatment zone 32, purified and then discharged to the atmosphere, and the other part of the waste gas (temperature: 21 ℃ C., NMP concentration: 380 ppm) flows into the low-temperature tube section of the first heat exchanger 22, and after the first heat exchange with the high-temperature high-concentration NMP gas (temperature: 150 ℃ C., NMP concentration: 5850 ppm) generated by the intermediate side oven unit 12, the temperature rises, and the waste gas is returned to the head side and/or tail side oven unit 11 (temperature: 125 ℃ C., NMP concentration: 380 ppm) again by a fan.
In this embodiment, the low-temperature gas absorbed by the middle side oven unit 12 exchanges heat with the high-temperature gas generated by the machine head side and/or the machine tail side oven unit 11, and no additional gas heater is required to be provided for the gas returned to the oven, and the subsequent gas heating operation.
Fig. 4 is a schematic structural diagram of a third embodiment of the two-stage return air organic gas recovery system according to the present invention, and compared with the second embodiment, the main difference of the present embodiment is that the heat exchange manner of the adsorbed gas is different. Unlike the second embodiment, in which the second heat exchanger 30 is disposed downstream of the adsorption zone 241 and upstream of the desorption zone 242 of the adsorption/desorption wheel 24, and the low-temperature gas adsorbed by the middle-side oven unit 12 is heat-exchanged with the high-temperature gas generated by the head-side and/or tail-side oven unit 11, the present embodiment is provided with the third heat exchanger 31 downstream of the adsorption zone 241 and upstream of the first heat exchanger height Wen Guanduan of the adsorption/desorption wheel 24, and the height Wen Guanduan of the third heat exchanger 31 is disposed between the first air flow inlet and the first heat exchanger height Wen Guanduan inlet; the low-temperature pipe section of the third heat exchanger 31 is disposed between the adsorption zone 241 and the first air outflow port 25, namely: the low-temperature gas adsorbed by the intermediate side oven unit 12 is heat-exchanged with the high-temperature gas generated by the intermediate side oven unit 12 itself 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 of 5850 ppm) generated in the middle side oven unit 12 enters the third heat exchanger 31 to perform the third heat exchange at a high temperature Wen Guanduan, the heat exchanged gas (temperature: 89.8 ℃ and NMP concentration of 5850 ppm) directly enters the high-temperature tube section of the first heat exchanger 22 to perform the first heat exchange, and the heat exchanged gas (temperature: 79.5 ℃ and NMP concentration of 2746 ppm) flows into the first condensation recovery assembly 23 to perform the first condensation recovery to condense NMP solvent; a part of the gas recovered by the first condensation is introduced into the concentrated treatment zone 32, purified and then discharged to the atmosphere, and the other part of the gas (temperature: 40 ℃ C., NMP concentration: 1327 ppm) flows into the adsorption zone 241 of the adsorption/desorption wheel 24 to further reduce the NMP concentration of the gas returned to the oven, and the gas recovered by the adsorption (temperature: 61 ℃ C., NMP concentration: 360 ppm) is introduced into the low-temperature tube section of the third heat exchanger 31, and is returned to the intermediate-side oven unit 12 (temperature: 125 ℃ C., NMP concentration: 360 ppm) again after being heated by heat exchange with the high-temperature high-concentration NMP gas (temperature: 150 ℃ C., NMP concentration: 5850 ppm) generated by the intermediate-side oven unit 12.
The high-temperature low-concentration NMP gas (temperature: 150 ℃ C., NMP concentration: 650 ppm) generated by the head-side and/or tail-side oven unit 11 is directly introduced into the desorption zone 242 of the adsorption/desorption wheel 24 as a regeneration heating source, the NMP gas adsorbed on the adsorption/desorption wheel 24 is desorbed and concentrated under the high-temperature effect thereof, 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 ℃ C., NMP concentration: 5159 ppm), and flows into the second condensation recovery assembly 27 for second condensation recovery to further condense NMP solvent; part of the gas recovered by the second condensation is introduced into the concentrated treatment zone 32, purified and then discharged to the atmosphere, and the other part of the waste gas (temperature: 21 ℃ C., NMP concentration: 380 ppm) flows into the low-temperature tube section of the first heat exchanger 22, and after the first heat exchange with the high-temperature high-concentration NMP gas (temperature: 89.8 ℃ C., NMP concentration: 5850 ppm) generated by the intermediate side oven unit 12, the temperature rises, and the waste gas is returned to the head side and/or tail side oven unit 11 (temperature: 76.1 ℃ C., NMP concentration: 380 ppm) again by a 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 an additional gas heater is not required to be provided for the gas returned to the oven, and the subsequent gas heating operation is also not required.
Fig. 5 is a schematic structural diagram of a fourth embodiment of a two-stage return air organic gas recovery system according to the present invention, in which only an adsorption zone 241 and a desorption zone 242 are provided on the adsorption/desorption rotating wheel 24 in the first, second and third embodiments, the temperature of the rotating wheel is rapidly increased after the high-temperature low-concentration NMP gas generated by the head-side and/or tail-side oven unit 11 acts on the desorption zone 242, and the increase of the temperature of the adsorption/desorption rotating wheel 24 is unfavorable for the adsorption of the NMP gas by the adsorption zone 241, so compared with the first embodiment and the second embodiment, the main difference of the present embodiment is that a cooling zone 243 is additionally provided on the adsorption/desorption rotating wheel 24. 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 air path of the adsorption zone 241, and the outlet of the cooling zone 243 is connected with the inlet air path of the adsorption zone 241, namely: after the low-temperature gas adsorbed by the adsorption zone 241 is led into the cooling zone 243 to cool the rotating wheel, the gas returns to the adsorption zone 241 again to enter the adsorption cycle, thereby effectively improving the NMP gas adsorption efficiency.
In addition, in order to further improve the adsorption efficiency of the adsorption/desorption wheel 24 on NMP gas, the adsorption/desorption wheel 24 in the first, second and third embodiments of the present invention may further be configured with at least two adsorption areas 241, and the gas generated from the middle side oven unit 12 and recovered by the first condensation sequentially passes through the at least two adsorption areas to be subjected to at least two gas adsorption, and after the adsorption for more than two times, the NMP concentration in the return oven is lower than 200ppm, so as to further improve the adsorption efficiency of the system.
In each specific implementation process of the invention, the production device for lithium battery coating is preferably provided with a multi-layer structure, each layer is preferably provided with 12 sections of ovens, each six sections of ovens use one double-stage return air organic gas recovery system of the invention, specifically, the 1 st, 2 nd and 3 rd sections of each layer of ovens are machine head side oven units, the 10 th, 11 th and 12 th sections of ovens are machine tail side oven units, and high-temperature exhaust gas (namely, the second exhaust gas of the invention) discharged by the two sections of ovens is used for respectively desorbing and regenerating first exhaust gas (shown in figures 2, 3 and 5) after absorption generated by the 4 th, 5 th and 6 th sections of ovens (namely, the middle side oven units) and the 7 th, 8 th and 9 th sections of ovens (namely, the middle side oven units) because of relatively low NMP concentration; in addition, in other embodiments of the present invention, the low-concentration high-temperature exhaust gas generated by one section of the head-side or tail-side oven is used as a regeneration heating source to provide desorption regeneration heating for the exhaust gas generated and adsorbed by the other five sections of ovens (as shown in fig. 4). It should be understood that the description of the number of layers, sections, head side and/or tail side oven units and intermediate side oven units of the present invention is merely illustrative and should not be construed as limiting the scope of the claims, and that any number of layers, sections, head side and/or tail side oven units and intermediate side oven units of the present invention may be set by one skilled in the art as desired.
It should be understood that although the present disclosure describes embodiments, not every embodiment is provided with a separate embodiment, and that this description is for clarity only, and that the skilled artisan should recognize that the embodiments may be combined as appropriate to form other embodiments that will be understood by those skilled in the art.
The above list of detailed descriptions is only specific to practical embodiments of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent embodiments or modifications that do not depart from the spirit of the present invention should be included in the scope of the present invention.
Claims (20)
1. A two-stage return air organic gas recovery method,
the method is characterized by comprising the following steps of:
i) A step of performing a first heat exchange by passing the first offgas from the partial production plant to a high Wen Guanduan of the first heat exchanger;
ii) a step of first condensing and recovering the first waste gas after the first heat exchange;
iii) A step of adsorbing and recovering at least part of the first waste gas after the first condensation and recovery;
iv) a step of secondarily heating the first waste gas after adsorption recovery to generate first-stage return air and returning the first-stage return air to the production device;
v) regenerating the desorbed first offgas from the other part of the production plant as a heating source to produce a regenerated gas containing at least the second offgas and at least part of the adsorbed recovered first offgas recovered after concentration and desorption;
vi) subjecting the 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 said first heat exchange with said first offgas of high Wen Guanduan entering the first heat exchanger in a low temperature pipe section of the first heat exchanger;
viii) returning at least part of the regenerated gas after the first heat exchange to the production unit to produce a second stage return air.
2. A two-stage return air organic gas recovery method as claimed in claim 1, wherein in step iv), said secondary heating is an operation of directly heating the first exhaust gas after adsorption recovery by a gas heater.
3. A two-stage return air supply and recovery organic gas method according to claim 1, wherein in step iv), said secondary heating is performed by performing a second heat exchange operation between the first exhaust gas after adsorption recovery and said second exhaust gas before participation in the desorption step.
4. A two-stage return air supply and return organic gas recovery method as set forth in claim 1, wherein in step iv), said secondary heating is an operation of subjecting the first offgas after adsorption recovery to a third heat exchange with said first offgas before participating in the first heat exchange step of step i).
5. A two-stage return air organic gas recovery method as claimed in any one of claims 1 to 4, wherein in step iii), part of the first waste gas recovered by the first condensation is adsorbed and recovered, and the other part of the first waste gas is concentrated and purified and then discharged to the atmosphere.
6. A two-stage return air 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 said first heat exchange with the first exhaust gas, and the other part of the regenerated gas is concentrated and purified and then discharged to the atmosphere.
7. A dual stage return air organic gas recovery module comprising:
a first gas stream inlet;
a first heat exchanger;
a first condensate recovery assembly;
characterized by further comprising:
the adsorption and desorption assembly at least comprises an adsorption area and a desorption area;
a first air flow outlet;
a first temperature increasing component;
the first air flow inlet, the first heat exchanger height Wen Guanduan, the first condensation recovery assembly, the adsorption zone, the first heating assembly and the first air flow outlet are sequentially connected through air paths to form a first-stage air supply and return circulation of first waste gas;
a second airflow inlet;
a second condensate recovery assembly;
a second airflow outlet;
the second air inlet, the desorption area, the second condensation recovery assembly, the first heat exchanger low-temperature pipe section and the second air outlet are sequentially connected to form a second-stage air supply and return circulation of second waste gas, wherein the second waste gas acts on the desorption area to serve as a regeneration gas heating source.
8. A dual stage return air organic gas recovery module as set forth in claim 7 wherein said first temperature raising assembly is a gas heater.
9. A dual stage return air organic gas recovery module as set forth in claim 7 wherein said first temperature raising assembly is a second heat exchanger, said second heat exchanger having a height Wen Guanduan disposed between said second gas flow inlet and said desorption zone, and a low temperature tube section of said second heat exchanger being disposed between said adsorption zone and said first gas flow outlet.
10. The dual stage return air organic gas recovery module of claim 7, wherein the first temperature raising assembly is a third heat exchanger, a height Wen Guanduan of the third heat exchanger being disposed between the first air flow inlet and the first heat exchanger height Wen Guanduan inlet; the low-temperature pipe section of the third heat exchanger is arranged between the adsorption zone and the first air outflow port.
11. A dual stage return air organic gas recovery module as set forth in claim 7 further comprising a centralized processing zone respectively connecting said first and second condensate recovery assembly outlets.
12. The dual stage return air organic gas recovery module of claim 7, wherein the first heat exchanger is disposed diagonally downward in the first exhaust flow direction.
13. A dual stage return air organic gas recovery module as set forth in claim 7 wherein said first condensate recovery assembly is a cooling water coil or chilled water coil.
14. A two-stage return air organic gas recovery module as set forth in claim 7 or 13 wherein said second condensation recovery assembly comprises at least a first condensation recovery apparatus and a second condensation recovery apparatus, wherein said first condensation recovery apparatus is a cooling water coil and said second condensation recovery apparatus is a chilled water coil.
15. A two-stage return air organic gas recovery module as claimed in claim 7, wherein the adsorption and desorption assembly is a molecular sieve adsorption and desorption wheel.
16. A dual stage return air organic gas recovery module as defined in claim 15 wherein said adsorption rotor further comprises a cooling zone, said cooling zone inlet being in air connection with said adsorption zone outlet and said cooling zone outlet being in air connection with said adsorption zone inlet.
17. A dual stage return air organic gas recovery module as set forth in claim 15 wherein said adsorption zone is at least two.
18. A two-stage return air organic gas recovery system, comprising:
a production device;
and a dual stage return air organic gas recovery module as defined in any one of claims 7-17 in pneumatic connection 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 air flow outlet and a first production device unit air flow inlet, the first production device unit air flow outlet is connected with the first air flow inlet air circuit, and the first production device unit air flow inlet is connected with the first air flow outlet air circuit;
the second production device unit generates second waste gas and comprises a second production device unit air flow outlet and a second production device unit air flow inlet, the second production device unit air flow outlet is connected with the second air flow inlet air circuit, and the second production device unit air flow inlet is connected with the second air flow outlet air circuit.
19. A dual stage return air organic gas recovery system as defined in claim 18 wherein said production means is a lithium battery cathode coater oven or printing, semiconductor, adhesive tape manufacturing environment means.
20. A dual stage return air organic gas recovery system as defined in claim 18 wherein said production device is a lithium battery cathode coater oven line, wherein said first production device unit is at least one oven section on the middle side of the line; the second production device unit is at least one section of oven at the machine head side and/or the machine tail side of the production line.
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