CN113198298A - NMP gas recovery device - Google Patents
NMP gas recovery device Download PDFInfo
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- CN113198298A CN113198298A CN202110656686.XA CN202110656686A CN113198298A CN 113198298 A CN113198298 A CN 113198298A CN 202110656686 A CN202110656686 A CN 202110656686A CN 113198298 A CN113198298 A CN 113198298A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/14—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 absorption
- B01D53/1406—Multiple stage absorption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/14—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 absorption
- B01D53/1412—Controlling the absorption process
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/14—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 absorption
- B01D53/1418—Recovery of products
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/14—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 absorption
- B01D53/1425—Regeneration of liquid absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/14—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 absorption
- B01D53/1487—Removing organic compounds
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- 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
- B01D53/14—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 absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
- B01D53/185—Liquid distributors
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D207/00—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom
- C07D207/02—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom
- C07D207/18—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member
- C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
- C07D207/24—Oxygen or sulfur atoms
- C07D207/26—2-Pyrrolidones
- C07D207/263—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms
- C07D207/267—2-Pyrrolidones with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to other ring carbon atoms with only hydrogen atoms or radicals containing only hydrogen and carbon atoms directly attached to the ring nitrogen atom
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2247/00—Details relating to the separation of dispersed particles from gases, air or vapours by liquid as separating agent
- B01D2247/10—Means for removing the washing fluid dispersed in the gas or vapours
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
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Abstract
The invention relates to an NMP gas recovery device, which is used for recovering and treating high-temperature NMP waste gas generated by coating equipment in lithium ion battery production, and comprises a heat recovery system, an NMP recovery tower, a circulating water system and an NMP recovery tank: a water storage area, a first filtering area, a second filtering area and a demisting area are sequentially arranged in the NMP recovery tower from bottom to top, and the circulating water system comprises a primary water circulating system formed by circularly connecting a primary water tank, a primary circulating pump, a spraying device and the water storage area and a secondary water circulating system formed by circularly connecting a secondary water tank, a bubble cap filtering layer and a secondary circulating pump; when the concentration of NMP in the primary water tank reaches the target concentration, firstly discharging the liquid in the primary water tank to an NMP recovery tank, and stopping discharging after the discharging is finished; then, filling the liquid in the secondary water tank into the primary water tank, and stopping filling water after the primary water tank is filled with water; and finally, injecting water into the secondary water tank by the water source, and stopping injecting water after the secondary water tank is filled with water.
Description
Technical Field
The invention relates to the technical field of NMP gas treatment, in particular to a NMP gas recovery device.
Background
NMP (N-methyl pyrrolidone) is a strong polar aprotic solvent with excellent performance, has a series of advantages of stable chemical performance, high temperature resistance, strong dissolving capacity, low volatility, high safety, low toxicity and the like, and is widely applied to the production of lithium ion batteries and used as a solvent of PVDF (polyvinylidene fluoride) as a binder.
In the coating process of lithium ion battery production, NMP is discharged from coating equipment in the form of waste gas, and if the waste gas is directly discharged into the environment without being recycled, on one hand, environmental pollution is caused, and on the other hand, great resource waste is caused. Therefore, it is necessary to recover and treat the exhaust gas.
The existing NMP waste gas recovery and treatment device mainly has two modes of rotary wheel adsorption and refrigeration recovery. The rotary wheel adsorption type recovery device has high energy consumption in operation, expensive equipment maintenance cost and low operating economy; the refrigeration recovery device has low recovery efficiency and high discharge concentration, and is difficult to adapt to the environmental protection requirement. Therefore, there is a need for an improvement in the structure of the conventional NMP exhaust gas recovery and treatment apparatus.
Disclosure of Invention
In order to solve the problems, the invention provides an NMP gas recovery device, which is used for recovering and treating high-temperature NMP waste gas generated by a coating device in lithium ion battery production, and comprises a heat recovery system, an NMP recovery tower, a circulating water system and an NMP recovery tank:
the heat recovery system comprises at least one heat exchanger, the coating equipment comprises a plurality of NMP high-temperature gas outlets and a plurality of fresh air inlets, the heat exchanger comprises an NMP waste gas channel and an air channel, and the NMP high-temperature gas outlets are connected with the air inlet of the NMP recovery tower through at least one NMP waste gas channel; the outside fresh air is communicated with the fresh air inlets through at least one air channel;
a water storage area, a first filtering area, a second filtering area and a demisting area are sequentially arranged in the NMP recovery tower from bottom to top, and an air inlet of the NMP recovery tower is positioned between the water storage area and the first filtering area; the top of the NMP recovery tower is provided with a discharge port; the first filtering area is provided with at least one filling filtering layer, the second filtering area is provided with at least one bubble cap filtering layer, and a demister is arranged in the demisting area;
the circulating water system comprises a primary water tank, a spraying device and a secondary water tank, wherein the secondary water tank supplies water through a water source; the first-stage water tank and the second-stage water tank are connected through a water supply pipe, and a water supply valve is arranged on the water supply pipe; the first-stage water tank is connected with at least one spraying device through a first-stage circulating pump, the spraying device is arranged above the filling and filtering layer, the first-stage water tank, the first-stage circulating pump, the spraying device and the water storage area are connected in a circulating mode to form a first-stage water circulating system, a second-stage circulating pump is arranged between the second-stage water tank and the second filtering area, and the second-stage water tank, the bubble cap filtering layer and the second-stage circulating pump are connected in a circulating mode to form a second-stage water circulating system;
the primary water tank is connected with the NMP recovery tank through a recovery water pipe, and a recovery pump and a recovery valve are arranged on the recovery water pipe;
the primary water tank is provided with an NMP concentration detector for detecting the concentration of NMP in the primary water tank, when the concentration of NMP in the primary water tank reaches a target concentration, liquid in the primary water tank is discharged to the NMP recovery tank, and the liquid is stopped after the liquid is discharged; then, filling the liquid in the secondary water tank into the primary water tank, and stopping filling water after the primary water tank is filled with water; and finally, injecting water into the secondary water tank by a water source, and stopping injecting water into the secondary water tank after water is injected into the secondary water tank.
Preferably, the heat recovery system comprises a plurality of heat exchangers, the inlet of the NMP waste gas channel of one heat exchanger is connected with the NMP high-temperature gas outlet through an air inlet pipe, and the outlet of the air channel of one heat exchanger is connected with the fresh air inlet through an exhaust pipe;
the outlets of the NMP waste gas channels of the heat exchangers are all communicated with a main gas pipe, the main gas pipe is communicated with the gas inlet of the NMP recovery tower, and a main fan is arranged on the main gas pipe.
Preferably, an inlet of the air channel is communicated with the outside air through a fresh air inlet pipe, an air inlet end of the fresh air inlet pipe is provided with a filtering device, and the fresh air inlet pipe is provided with a blower.
Preferably, a plurality of layers of the filling filter layers are sequentially arranged in the first filtering area from top to bottom at intervals, and the spraying device is arranged above each filling filter layer.
Preferably, the filling filter layer is filled with a filler, and the filler is made of a corrosion-resistant material.
Preferably, the bubble cap filter layer comprises a water tank, a plurality of strip-shaped through holes are formed in the water tank, strip-shaped bubble caps are fixedly arranged on the strip-shaped through holes, S-shaped vent holes communicated with the strip-shaped through holes are formed in the strip-shaped bubble caps, and when NMP gas recovery operation is performed, the positions of outlets of the S-shaped vent holes are lower than the liquid level height in the water tank;
the water tank is also provided with an overflow port, and a water inlet of the secondary water tank is connected with the overflow port through a water inlet pipeline; the water outlet of the secondary water tank is communicated with the water tank through a water outlet pipeline, and a water outlet valve and the secondary circulating pump are arranged on the water outlet pipeline.
Preferably, the strip-shaped bubble cap comprises an S-shaped long strip plate and a straight plate, the cross section of the S-shaped long strip plate is S-shaped, one end of the S-shaped long strip plate is fixedly connected with one side of the strip-shaped through hole, one end of the straight plate is fixedly connected with the other side of the strip-shaped through hole, and the S-shaped long strip plate covers the straight plate and forms an S-shaped vent hole between the straight plate and the straight plate.
Preferably, the water source supplies water to the secondary water tank through the second filtering area, the water source is communicated with the water tank through a water supply pipeline, and a water supply valve is arranged on the water supply pipeline.
Preferably, the second filtering area comprises a plurality of bubble cap filtering layers, and the water source is communicated with the water tank of the bubble cap filtering layer at the uppermost layer through the water supply pipeline;
the overflow ports of the bubble cap filter layers of two adjacent layers are staggered;
the water inlet of the secondary water tank is connected with the overflow port of the bubble cap filter layer at the lowest layer through the water inlet pipeline, and the water outlet of the secondary water tank is communicated with the water tank of the bubble cap filter layer at any layer through the water outlet pipeline.
Preferably, a filtering device and a heat exchange condenser are further sequentially arranged on a connecting pipeline between the water storage area and the primary water tank, and the heat exchange condenser is connected with external cooling water.
Compared with the prior art, the invention has the following technical effects:
1. the technical effect of recycling the heat energy can be effectively achieved;
2. the wet cooling is utilized for recycling, only a water source (engineering water or pure water) is used in the operation, and no danger and secondary pollution exist;
3. the equipment scale is reduced, and the occupied area is reduced (the monomer equipment can ensure high-concentration recovery and discharge after reaching standards);
4. can ensure the recovery of high-concentration NMP (more than 85 wt%);
5. the NMP recovery rate is extremely high (the recovery rate is more than 99 percent);
6. the effect of reaching the standard of atmospheric emission can be ensured all the time no matter the temperature of the NMP gas emission source rises and the concentration is high;
7. and the automatic control (NMP gas cooling, collection, waste liquid recovery, atmospheric emission and other all processes) is completely realized.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts. In the drawings:
FIG. 1 is a schematic structural view of an NMP gas recovery apparatus according to a preferred embodiment of the present invention (a secondary water tank is disposed outside an NMP recovery tower);
FIG. 2 is a schematic structural diagram of an NMP gas recovery device according to a preferred embodiment of the present invention (a secondary water tank is disposed in a water storage area);
FIG. 3 is a top view of a blister filter layer provided by a preferred embodiment of the present invention;
FIG. 4 is a perspective view of a blister filter layer provided by a preferred embodiment of the present invention;
FIG. 5 is a front view of a blister filter layer provided by a preferred embodiment of the present invention;
figure 6 is a cross-sectional view a-a of a blister filter layer provided by a preferred embodiment of the present invention.
Detailed Description
The following will describe an NMP gas recovery apparatus provided by the present invention in detail with reference to fig. 1 to 6, which is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples, and those skilled in the art can modify and color the NMP gas recovery apparatus without changing the spirit and content of the present invention.
Referring to fig. 1 to 6, an NMP gas recovery apparatus for recovering and treating high-temperature NMP waste gas generated by a coating apparatus 1 in lithium ion battery production includes a heat recovery system 2, an NMP recovery tower 6, a circulating water system, and an NMP recovery tank 8:
the heat recovery system 2 comprises at least one heat exchanger 21, the coating device 1 comprises a plurality of NMP high-temperature gas outlets and a plurality of fresh air inlets, the heat exchanger 21 comprises an NMP waste gas channel and an air channel, and the NMP high-temperature gas outlets are connected with the air inlet of the NMP recovery tower 6 through at least one NMP waste gas channel; and the outside fresh air is communicated with the fresh air inlets through at least one air channel. Coating equipment 1 need supply coating equipment 1 after heating fresh air when discharging the NMP high temperature gas, and fresh air carries out heat exchange with the NMP high temperature gas of discharge when supplying, and partial heat that fresh air needs is from absorbing in the NMP high temperature gas of discharge, has reached the effective recycle's of heat energy technical effect. The NMP high-temperature gas releases heat and is then conveyed to an NMP recovery tower 6.
The heat recovery system 2 comprises a plurality of heat exchangers 21 without limitation, namely an NMP high-temperature gas outlet can be respectively connected with the air inlet of the NMP recovery tower 6 through one heat exchanger 21, and one heat exchanger 21 corresponds to a fresh air inlet; alternatively, a plurality of NMP high-temperature gas outlets share one heat exchanger 21 to be connected with the air inlet of the NMP recovery tower 6, and one heat exchanger 21 corresponds to a plurality of fresh air inlets. In order to recover more heat, in this embodiment, it is preferable that an NMP high-temperature gas outlet is connected to the air inlet 62 of the NMP recovery tower 6 through a heat exchanger 21, specifically, the heat recovery system 2 includes a plurality of heat exchangers 21, an NMP waste gas passage inlet of the heat exchanger 21 is connected to an NMP high-temperature gas outlet through an air inlet pipe, and an air passage outlet of the heat exchanger 21 is connected to a fresh air inlet through an air outlet pipe; the outlets of the NMP waste gas channels of the heat exchangers 21 are communicated with a main gas pipe 4 through a branch gas pipe 24, and a fan 25 is arranged on the branch gas pipe 24. The main air pipe 4 is communicated with an air inlet 62 of the NMP recovery tower 6, the main air pipe 4 is provided with a main fan 5, and the main fan 5 can automatically adjust air volume according to air volume change, temperature change, gas concentration change and the like of an NMP waste gas emission source, stabilize air flow and keep equipment stable in operation.
The inlet of the air channel of the heat exchanger 21 is communicated with the outside air through a fresh air inlet pipe, the air inlet end of the fresh air inlet pipe is provided with a first filtering device 22 (the filtering device belongs to the conventional technology in the field, the embodiment does not limit the specific structure of the first filtering device 22, and can be a dust removing filter screen and the like), and the fresh air inlet pipe is provided with a blower 23.
A water storage area 61, a first filtering area, a second filtering area and a demisting area are sequentially arranged in the NMP recovery tower 6 from bottom to top, and an air inlet 62 of the NMP recovery tower 6 is positioned between the water storage area 61 and the first filtering area; the top of the NMP recovery tower 6 is provided with a discharge port 67; the first filtering area is provided with at least one layer of filling filtering layer 63, the second filtering area is provided with at least one layer of bubble cap filtering layer 65, the demisting area is internally provided with a demister 66, and NMP gas entering the NMP recovery tower 6 is discharged from a discharge port 67 after being sequentially filtered by the first filtering area and the second filtering area and then being subjected to moisture removal by the demister 66.
The circulating water system comprises a primary water tank 7, a spraying device 64 and a secondary water tank 9, wherein the secondary water tank 9 supplies water through an engineering water source 3, in the invention, the engineering water source 3 can directly supply water to the secondary water tank 9, and can also supply water to the secondary water tank 9 through a second filtering area, thereby the invention is not limited in particular. In order to increase the NMP recovery efficiency and the recovery concentration, the present embodiment exemplifies that the engineering water source 3 supplies water to the secondary water tank 9 through the second filtering area.
The primary water tank 7 is connected with the secondary water tank 9; one-level water tank 7 is connected with an at least spray set 64 through one-level circulating pump 74, the top of filling filter layer 63 is equipped with spray set 64, circulation connection forms one-level water circulating system between one-level water tank 7, one-level circulating pump 74, spray set 64 and the water storage area 61, second grade water tank 9 with be equipped with second grade circulating pump 94 between the second filtering area, second grade water tank 9, bubble cap filter layer 65 and second grade circulating pump 94 circulation connection form second grade water circulating system.
The number of layers of the filling and filtering layers 63 is not limited, a spraying device 64 is arranged above each layer of the filling and filtering layers 63, and the spraying device 64 is used for spraying water to the filling and filtering layers 63. In the first filtering area, the high temperature NMP gas contacts with water, and the water can play the role of cooling and absorbing the high temperature NMP gas, and in order to fully absorb the cooling NMP gas, a plurality of layers of the filling and filtering layers 63 are arranged at intervals from top to bottom in the first filtering area of the embodiment.
In this embodiment, the filling and filtering layer 63 is filled with a filler, which is a corrosion-resistant material, such as PP balls, pall rings, or other materials.
The primary water tank 7 is located outside the NMP recovery tower 6, a second filtering device 77 and a heat exchange condenser 75 are further sequentially arranged on a connecting pipeline 76 between the water storage area 61 and the primary water tank 7, the filtering device belongs to the conventional technology in the field, and the specific structure of the second filtering device 77 is not limited in the embodiment and can be a filter screen and the like. The heat-exchange condenser 75 is connected to outside cooling water, that is, in the heat-exchange condenser 75, the outside cooling water exchanges heat with warm water containing NMP in the connecting line 76, and the warm water containing NMP releases heat to the cooling water.
A primary circulation pump 74 is provided in the primary tank 7 for sending water in the primary tank 7 to the plurality of showers 64. In this embodiment, the spraying device 64 includes a water pipe branch located in the NMP recovery tower 6 and a plurality of spray heads, and the plurality of spray heads are arranged on the water pipe branch at intervals. One end of each water pipe branch passes through the NMP recovery tower 6 and is connected with a water pipe main 71, and the water pipe main 71 is connected with the outlet of the first-stage circulating pump 74.
The one-level water tank 7 is provided with an NMP concentration detector 72 for detecting the NMP concentration in the one-level water tank 7 and a first liquid level sensor 73 for detecting the liquid level height in the one-level water tank 7, the water storage area 61 is provided with a second liquid level sensor 611, in the embodiment, the water storage area 61 is flush with the bottom of the one-level water tank 7, and the liquid levels of the two are the same.
NMP retrieves jar 8 and is located the outside that the NMP retrieved tower 6, one-level water tank 7 with NMP retrieves jar 8 and links to each other, is equipped with recovery pump 83 and recovery valve 81 on the recovery water pipe 82 between one-level water tank 7 and the NMP retrieves jar 8.
In this embodiment, bubble cap filter layer 65 includes basin 651, and basin 651 is fixed in NMP recovery tower 6, set up a plurality of bar through-holes on the basin 651, bar bubble cap 652 has set firmly on the bar through-hole, be equipped with on the bar bubble cap 652 with the communicating S type air vent 6523 of bar through-hole, when NMP gas recovery operation, the position of the export of S type air vent 6523 is less than liquid level height in the basin, the purpose gets into the second filtration region' S NMP gas, gets into S type air vent 6523 from the bar through-hole of basin 651, and NMP gas that the export of S type air vent 6523 came out gets into the aquatic of basin 651 again, and the purpose is the gaseous area of passing through that increases, reduces the ventilation pressure differential effect, effectively increases and water contact to increase NMP gas absorption effect.
Specifically, the strip-shaped blister 652 comprises an S-shaped long strip 6521 and a straight plate 6522, the cross section of the S-shaped long strip 6521 is S-shaped, one end of the S-shaped long strip 6521 is fixedly connected with one side of the strip-shaped through hole, one end of the straight plate 6522 is fixedly connected with the other side of the strip-shaped through hole, and the S-shaped long strip 6521 covers the straight plate 6522 and forms an S-shaped vent hole 6523 with the straight plate 6522.
The water tank 651 is also provided with an overflow port 653, and a water inlet of the secondary water tank 9 is connected with the overflow port 653 through a water inlet pipeline 93; the water outlet of the secondary water tank 9 is communicated with the water tank 651 through a water outlet pipeline 91, and a water outlet valve 92 and a secondary circulating pump 94 are arranged on the water outlet pipeline 91.
The number of the strip-shaped bubble caps 652 arranged on the water tank 651 is not particularly limited, and can be set according to specific use requirements.
In the present invention, the number of layers of the bubble cap filter layer 65 is not limited, and in order to increase the NMP recovery efficiency and the recovery concentration, it is preferable that the second filter region includes a plurality of layers of the bubble cap filter layers 65, the engineering water source 3 is communicated with the water tank 651 of the bubble cap filter layer 65 at the uppermost layer through the water supply line 31, and the water supply line 31 is provided with the first water supply valve 32;
the overflow ports 653 of the blister filter layers 65 of two adjacent layers are staggered;
the water inlet of the secondary water tank 9 is connected with the overflow port 653 of the bubble cap filter layer 65 at the lowest layer through the water inlet pipeline 93, the water outlet of the secondary water tank 9 is communicated with the water tank 651 of the bubble cap filter layer 65 at any layer through the water outlet pipeline 91, and the water outlet pipeline 91 is provided with a water outlet valve 92 and a secondary circulating pump 94. In this embodiment, the primary water tank 7 and the secondary water tank 9 are connected by a water supply pipe 96, and the secondary circulation pump 94 is also located on the water supply pipe 96, i.e., the water supply pipe 96 and the water outlet line 91 share a part of the pipe sections. A second water supply valve 95 is also provided on the water supply pipe 96, said second water supply valve 95 not being provided on the water outlet conduit 91, i.e. not on the section of the pipe section common to the water supply pipe 96 and the water outlet conduit 91.
In this embodiment, the secondary water tank 9 may be outside the NMP recovery tower 6, see fig. 1; the secondary water tank 9 may also be provided with a water storage area 61 within the NMP recovery tower 6, see fig. 2. In this embodiment, taking three layers of bubble cap filter layers 65 as an example, the engineering water source 3 is communicated with the water tank of the bubble cap filter layer 65' at the uppermost layer through the water supply pipeline 31, the water inlet of the secondary water tank 9 is connected with the overflow port 653 ' ″ of the bubble cap filter layer 65' ″ at the lowermost layer through the water inlet pipeline 93, and the water outlet of the secondary water tank 9 is communicated with the water tank of the bubble cap filter layer 65 ″ at the middle layer through the water outlet pipeline 91. In this embodiment, the superiors be equipped with level sensor on bubble cap filter layer 65 ''s the basin for measure the superiors the liquid level of bubble cap filter layer 65 ''s basin guarantees that it can not hang down excessively, if too low, then through engineering water source 3 to the superiors supply water in bubble cap filter layer 65 ''s the basin, the purpose is guaranteed the superiors water in bubble cap filter layer 65's the basin can not because of being few and by the evaporation, and then can not contact with water when preventing that NMP gas from passing through.
In this embodiment, the primary water tank 7, the secondary water tank 9, the water storage area 61, and the NMP recovery tank 8 are also provided with liquid level sensors.
When the water circulation system is initially operated, first, the first water supply valve 32 and the second water supply valve 95 are opened, the water outlet valve 92 and the recovery valve 81 are closed, the second-stage circulation pump 94 is opened, the first-stage circulation pump 74 and the recovery pump 83 are closed, the engineering water source 3 is filled into the water tank of the uppermost bubble filtration layer 65 'of the second region, when the water tank of the uppermost bubble filtration layer 65' is full of water, the water is filled into the water tank of the uppermost bubble filtration layer 65', the water overflows into the water tank of the intermediate bubble filtration layer 65 ″ through the overflow port, when the water tank of the intermediate bubble filtration layer 65 ″ is full of water, the water is filled into the water tank of the lowermost bubble filtration layer 65 ″ through the overflow port of the intermediate bubble filtration layer 65 ″, and when the water tank of the lowermost bubble filtration layer 65 ″ is full of water, the water is filled into the second-stage water tank 9 through the overflow port 653', the water in the secondary water tank 9 is injected into the primary water tank 7; when the water in the primary water tank 7 and the secondary water tank 9 meets the requirement (such as filling the water tanks, or meeting the liquid level requirement of the water tanks), the first water supply valve 32 and the second water supply valve 95 are closed, the water outlet valve 92 is opened, and the primary water circulation and the secondary water circulation start to operate, so that the NMP gas recovery is carried out.
The first-stage water circulation operation process: the water in the primary water tank 7 is sprayed by the spraying device 64 through the primary circulating pump 74, the sprayed water absorbs part of the NMP gas and then returns to the water storage area 61, and the water returning to the water storage area 61 returns to the primary water tank 7.
And a secondary water circulation operation process: the water in the secondary water tank 7 flows into the water tank of the middle bubble filtration layer 65 ″ of the second region by the secondary circulation pump 94, and flows from the overflow port of the middle bubble filtration layer 65 ″ into the water tank of the lowermost bubble filtration layer 65'″ and then flows from the overflow port of the lowermost bubble filtration layer 65' ″ into the secondary water tank 9.
In the case of NMP gas recovery, high-temperature NMP gas discharged from the coating apparatus 1 is first subjected to heat recovery by the heat recovery system 2 and then discharged into the NMP recovery tower 6, and the NMP gas is first subjected to cold zone absorption by the first filtration zone and then enters the second filtration zone for recovery (NMP gas is water-soluble, so that a part of NMP gas is absorbed by water in the first filtration zone and the second filtration zone when passing through the first filtration zone and the second filtration zone), and finally discharged from the discharge port 67 after being subjected to moisture removal by the demister 66.
When the concentration of the NMP in the primary water tank 7 reaches the target concentration, the recovery valve 81 and the recovery pump 83 are opened, the liquid in the primary water tank 7 is discharged to the NMP recovery tank 8, and after the discharge is finished, the recovery valve 81 and the recovery pump 83 are closed, and the discharge is stopped; then, the second water supply valve 95 is opened to fill the primary water tank 7 with the liquid in the secondary water tank 9, and when the primary water tank 7 is filled with water, the second water supply valve 95 is closed to stop the water filling; and finally, opening the first water supply valve 32, closing the water outlet valve 92, filling the engineering water source 3 into the secondary water tank 9, and closing the first water supply valve 32 after the secondary water tank 9 is filled with water, so that the water filling into the secondary water tank 9 is stopped.
For automation, the pumps and valves described above may be controlled by a control system.
Claims (10)
1. The utility model provides a NMP gas recovery unit for the high temperature NMP waste gas that scribbles the cloth and be equipped with the production in lithium ion battery production carries out recovery processing, its characterized in that retrieves tower, circulation water system and NMP including heat recovery system, NMP and retrieves jar:
the heat recovery system comprises at least one heat exchanger, the coating equipment comprises a plurality of NMP high-temperature gas outlets and a plurality of fresh air inlets, the heat exchanger comprises an NMP waste gas channel and an air channel, and the NMP high-temperature gas outlets are connected with the air inlet of the NMP recovery tower through at least one NMP waste gas channel; the outside fresh air is communicated with the fresh air inlets through at least one air channel;
a water storage area, a first filtering area, a second filtering area and a demisting area are sequentially arranged in the NMP recovery tower from bottom to top, and an air inlet of the NMP recovery tower is positioned between the water storage area and the first filtering area; the top of the NMP recovery tower is provided with a discharge port; the first filtering area is provided with at least one filling filtering layer, the second filtering area is provided with at least one bubble cap filtering layer, and a demister is arranged in the demisting area;
the circulating water system comprises a primary water tank, a spraying device and a secondary water tank, wherein the secondary water tank supplies water through a water source; the first-stage water tank and the second-stage water tank are connected through a water supply pipe, and a water supply valve is arranged on the water supply pipe; the first-stage water tank is connected with at least one spraying device through a first-stage circulating pump, the spraying device is arranged above the filling and filtering layer, the first-stage water tank, the first-stage circulating pump, the spraying device and the water storage area are connected in a circulating mode to form a first-stage water circulating system, a second-stage circulating pump is arranged between the second-stage water tank and the second filtering area, and the second-stage water tank, the bubble cap filtering layer and the second-stage circulating pump are connected in a circulating mode to form a second-stage water circulating system;
the primary water tank is connected with the NMP recovery tank through a recovery water pipe, and a recovery pump and a recovery valve are arranged on the recovery water pipe;
the primary water tank is provided with an NMP concentration detector for detecting the concentration of NMP in the primary water tank, when the concentration of NMP in the primary water tank reaches a target concentration, liquid in the primary water tank is discharged to the NMP recovery tank, and the liquid is stopped after the liquid is discharged; then, filling the liquid in the secondary water tank into the primary water tank, and stopping filling water after the primary water tank is filled with water; and finally, injecting water into the secondary water tank by a water source, and stopping injecting water into the secondary water tank after water is injected into the secondary water tank.
2. An NMP gas recovery apparatus in accordance with claim 1, wherein said heat recovery system comprises a plurality of said heat exchangers, an inlet of an NMP off-gas passage of said heat exchanger being connected to a high temperature gas outlet of said NMP through a gas inlet pipe, an outlet of an air passage of said heat exchanger being connected to a said fresh air inlet through a gas outlet pipe;
the outlets of the NMP waste gas channels of the heat exchangers are all communicated with a main gas pipe, the main gas pipe is communicated with the gas inlet of the NMP recovery tower, and a main fan is arranged on the main gas pipe.
3. The NMP gas recovery apparatus according to claim 1, wherein the inlet of the air passage is connected to the outside air through a fresh air inlet pipe, the air inlet end of the fresh air inlet pipe is provided with a filter device, and the fresh air inlet pipe is provided with a blower.
4. The NMP gas recovery apparatus of claim 1, wherein a plurality of said filling filter layers are sequentially disposed in said first filtering area from top to bottom at intervals, and a spraying device is disposed above each of said filling filter layers.
5. The NMP gas recovery apparatus in accordance with claim 1, wherein the filling filter layer is filled with a filler, and the filler is made of a corrosion-resistant material.
6. The NMP gas recovery device of claim 1, wherein the bubble cap filter layer comprises a water tank, a plurality of strip-shaped through holes are formed in the water tank, strip-shaped bubble caps are fixedly arranged on the strip-shaped through holes, S-shaped vent holes communicated with the strip-shaped through holes are formed in the strip-shaped bubble caps, and when NMP gas recovery operation is performed, the positions of outlets of the S-shaped vent holes are lower than the liquid level in the water tank;
the water tank is also provided with an overflow port, and a water inlet of the secondary water tank is connected with the overflow port through a water inlet pipeline; the water outlet of the secondary water tank is communicated with the water tank through a water outlet pipeline, and a water outlet valve and the secondary circulating pump are arranged on the water outlet pipeline.
7. The NMP gas recovery device of claim 6, wherein the strip-shaped bubble cap comprises an S-shaped strip plate and a straight plate, the section of the S-shaped strip plate is S-shaped, one end of the S-shaped strip plate is fixedly connected with one side of the strip-shaped through hole, one end of the straight plate is fixedly connected with the other side of the strip-shaped through hole, and the S-shaped strip plate covers the straight plate and forms an S-shaped vent hole with the straight plate.
8. The NMP gas recovery apparatus of claim 6, wherein the water supply supplies water to the secondary water tank through the second filtering section, the water supply communicating with a water tank through a water supply line, the water supply line having a water supply valve.
9. The NMP gas recovery apparatus as claimed in claim 8, wherein said second filter area includes a plurality of said bubble cap filter layers, and said water supply is communicated with the water tank of the uppermost said bubble cap filter layer through said water supply line;
the overflow ports of the bubble cap filter layers of two adjacent layers are staggered;
the water inlet of the secondary water tank is connected with the overflow port of the bubble cap filter layer at the lowest layer through the water inlet pipeline, and the water outlet of the secondary water tank is communicated with the water tank of the bubble cap filter layer at any layer through the water outlet pipeline.
10. The NMP gas recovery apparatus of claim 1, wherein a filtering device and a heat exchange condenser are sequentially disposed on the connection pipeline between the water storage area and the primary water tank, and the heat exchange condenser is connected to external cooling water.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110656686.XA CN113198298A (en) | 2021-06-11 | 2021-06-11 | NMP gas recovery device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110656686.XA CN113198298A (en) | 2021-06-11 | 2021-06-11 | NMP gas recovery device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975942A (en) * | 2021-10-26 | 2022-01-28 | 杭州国泰环保科技股份有限公司 | NMP recovery processing system and multistage processing method in battery production enterprise factory |
| CN114870575A (en) * | 2022-04-20 | 2022-08-09 | 镇江新纳环保材料有限公司 | NMP recycling system applied to battery slurry |
-
2021
- 2021-06-11 CN CN202110656686.XA patent/CN113198298A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113975942A (en) * | 2021-10-26 | 2022-01-28 | 杭州国泰环保科技股份有限公司 | NMP recovery processing system and multistage processing method in battery production enterprise factory |
| CN114870575A (en) * | 2022-04-20 | 2022-08-09 | 镇江新纳环保材料有限公司 | NMP recycling system applied to battery slurry |
| CN114870575B (en) * | 2022-04-20 | 2023-08-29 | 镇江新纳环保材料有限公司 | NMP recycling system applied to battery slurry |
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