CN210278712U - Organic gas recovery system for upper-layer drying oven of coating machine - Google Patents
Organic gas recovery system for upper-layer drying oven of coating machine Download PDFInfo
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- CN210278712U CN210278712U CN201921032313.XU CN201921032313U CN210278712U CN 210278712 U CN210278712 U CN 210278712U CN 201921032313 U CN201921032313 U CN 201921032313U CN 210278712 U CN210278712 U CN 210278712U
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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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The utility model relates to a coating machine upper oven organic matter gas recovery system, including first exhaust fan, gas heat exchanger, recovery tower, second exhaust fan, first circulating device, second circulating device, first heat exchanger, second heat exchanger. The recovery tower comprises a first recovery device and a second recovery device positioned at the upper part of the first recovery device; a first accommodating cavity and a first adsorption device are arranged in the first recovery device; the second recovery device is internally provided with a second containing cavity and a second adsorption device. The first circulating device is respectively communicated with the first containing cavity and the space above the first absorbing device in the first recovery device; the second circulating device is respectively communicated with the second accommodating cavity and the space above the second adsorption device in the second recovery device. The recovery system utilizes the recovery tower to adsorb organic gas in the gas twice, the adsorption is more complete, the gas flowing from the oven to the recovery tower exchanges heat with the gas flowing out after adsorption treatment from the recovery tower, and the temperature of the gas entering the oven is improved.
Description
Technical Field
The utility model relates to an organic matter gas recovery field, more specifically say, relate to a coating machine upper oven organic matter gas recovery system.
Background
N-methyl pyrrolidone (1-methyl-2-pyrrolidone, NMP for short) is colorless transparent liquid, the boiling point is 204 ℃, the flash point is 95 ℃, the viscosity is low, the liquid has ammonia smell, the chemical stability and the thermal stability are good, the polarity is high, the volatility is low, and the liquid can be mutually dissolved with water in any ratio.
NMP is the main component of waste gas discharged in the production of lithium ion batteries, is a toxic gas and has the content of 0.06% -0.5%. If NMP is not recycled, not only is environmental pollution caused, but also a great deal of waste of raw materials is caused, so that the recycling of NMP is an important link influencing environmental protection in the production process of green batteries.
In the prior art, there is no disclosure of how to discharge and recover organic gas such as NMP, and then recycle the discharged gas to flow into the oven of the coating machine to keep the pressure balance, and at the same time, keep the gas in a low-temperature and low-humidity state during the backflow to avoid the influence on the coating machine.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in providing a coating machine upper oven organic matter gas recovery system.
The utility model provides a technical scheme that its technical problem adopted is: constructing an organic matter gas recovery system of an upper-layer drying oven of a coating machine, wherein the organic matter gas recovery system comprises a first exhaust fan, a gas-gas heat exchanger, a recovery tower, a second exhaust fan, a first circulating device, a second circulating device, a first heat exchanger and a second heat exchanger;
the recovery tower comprises a first recovery device and a second recovery device positioned at the upper part of the first recovery device;
a first accommodating cavity positioned at the bottom and a first adsorption device positioned above the first accommodating cavity are arranged in the first recovery device;
a second containing cavity positioned at the bottom and a second adsorption device positioned above the second containing cavity are arranged in the second recovery device;
the upper end of the first adsorption device is communicated with the lower space of the second adsorption device in the second recovery device;
the drying oven is provided with an air outlet and an air inlet, the first exhaust fan is communicated with the air outlet of the drying oven, and the gas-gas heat exchanger is provided with an air inlet channel and an air outlet channel; the side wall of the first recovery device is provided with an air inlet, and the top of the second recovery device is provided with an air outlet;
the two ends of the air inlet channel are respectively communicated with the first exhaust fan and the air inlet, the two ends of the air outlet channel are respectively communicated with the air inlet and the second exhaust fan, the first exhaust fan is communicated with the air outlet, and the second exhaust fan is communicated with the air outlet;
the first circulation device is respectively communicated with the first accommodating cavity and the space above the first adsorption device in the first recovery device so as to pump the solution in the first accommodating cavity above the first adsorption device and spray the solution onto the first adsorption device;
the second circulating device is respectively communicated with the second accommodating cavity and the space above the second adsorption device in the second recovery device so as to pump the solution in the second accommodating cavity above the second adsorption device and spray the solution onto the second adsorption device;
the first adsorption device and the second adsorption device respectively store water so as to adsorb the gas to be recovered which rises and passes through;
the first heat exchanger exchanges heat with the solution in the first accommodating cavity and reduces the temperature; and the second heat exchanger exchanges heat and reduces the temperature of the solution in the second accommodating cavity.
Preferably, the upper end of the first recovery device is provided with a vent pipe extending upwards into the second recovery device, and the second receiving cavity is arranged around the periphery of the vent pipe.
Preferably, the upper end of the vent pipe is provided with a shielding cover for preventing the liquid on the second adsorption device from flowing into the vent pipe.
Preferably, the gas-gas heat exchanger is a plate heat exchanger.
Preferably, the first circulation device comprises a circulation pump located outside the recovery tower, and the circulation pump is communicated with the first accommodating cavity and the space above the first absorption device in the first recovery device.
Preferably, the recovery system further comprises a recovery vessel in communication with the circulation pump.
Preferably, the first heat exchanger comprises a closed cooling tower, the first accommodating cavity is communicated with the closed cooling tower through a pipeline, and a first cooling pump is arranged on the pipeline communicated between the first accommodating cavity and the closed cooling tower, so that the solution in the first accommodating cavity flows circularly and exchanges heat with circulating cooling water in the closed cooling tower for cooling.
Preferably, the second heat exchanger is installed on the circulation loop of the second circulation device.
Preferably, the second heat exchanger is a plate-type liquid-liquid heat exchanger.
Preferably, the second circulating device comprises a second cooling pump mounted on a circulating loop of the second circulating device, and the second cooling pump allows the solution in the first accommodating cavity to circularly flow and exchanges heat with circulating cooling water in the second heat exchanger for cooling.
Implement the utility model discloses a coating machine upper oven organic matter gas recovery system has following beneficial effect: recovery system can utilize the recovery tower to divide twice to the organic matter gas absorption in the gas, let adsorb more completely, in addition, from the oven to the gas that the recovery tower flows and the gaseous heat transfer each other that flows out after the recovery tower adsorption treatment, promote the temperature of the gas that gets into the oven, liquid in the recovery tower also with outside heat transfer, keep recovery tower inside temperature to be in the low temperature state, whole recovery process is anhydrous and the participation of high humid air, just also guarantee that the gas that flows into in the oven is in low temperature low humidity state, avoid causing the influence to the coating machine upper oven, the security has been promoted.
Drawings
The invention will be further explained with reference to the drawings and examples, wherein:
fig. 1 is a schematic structural principle diagram of an organic gas recovery system of an upper oven of a coating machine in an embodiment of the present invention.
Detailed Description
In order to clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
As shown in fig. 1, the organic gas recovery system of the upper oven of the coating machine in a preferred embodiment of the present invention includes a first exhaust fan 1, a gas-gas heat exchanger 2, a recovery tower 3, a second exhaust fan 4, a first circulation device 5, a second circulation device 6, a first heat exchanger 7, and a second heat exchanger 8, N-methyl pyrolidone is present in the upper oven 9 of the coating machine, the recovery system can discharge the gas in the oven 9 to recover N-methyl pyrolidone (NMP), and then the gas is circulated to flow into the oven 9, and the recovery system can also be used to recover other organic gases that are easily adsorbed by water.
The recovery tower 3 comprises a first recovery device 31 and a second recovery device 32 positioned at the upper part of the first recovery device 31; the first recycling device 31 is provided with a first receiving cavity 311 at the bottom and a first absorbing device 312 above the first receiving cavity 311. The second recovery device 32 is provided with a second receiving cavity 321 at the bottom and a second adsorption device 322 above the second receiving cavity 321.
The upper end of the first adsorption device 312 is communicated with the lower space of the second adsorption device 322 in the second recovery device 32, so that the gas in the first recovery device 31 can rise upwards into the second recovery device 32 to continuously adsorb and recover the incompletely adsorbed organic gas.
The oven 9 is provided with an air outlet 91 and an air inlet 92, the first exhaust fan 1 is communicated with the air outlet 91 of the oven 9, and the gas-gas heat exchanger 2 is provided with an air inlet channel and an air outlet channel; the side wall of the first recovery device 31 is provided with an air inlet 313, and the top of the second recovery device 32 is provided with an air outlet 323.
Two ends of the air inlet channel are respectively communicated with the first exhaust fan 1 and the air inlet 313, two ends of the air outlet channel are respectively communicated with the air inlet 92 and the second exhaust fan 4, the first exhaust fan 1 is communicated with the air outlet 91, and the second exhaust fan 4 is communicated with the air outlet 323.
The first circulation device 5 is respectively communicated with the first receiving cavity 311 and the space above the first absorption device 312 in the first recovery device 31, so as to pump the solution in the first receiving cavity 311 above the first absorption device 312 and spray the solution on the first absorption device 312.
The second circulation device 6 is respectively communicated with the second receiving cavity 321 and the space above the second adsorption device 322 in the second recovery device 32, so as to pump the solution in the second receiving cavity 321 to the upper part of the second adsorption device 322 and spray the solution on the second adsorption device 322.
The first adsorption device 312 and the second adsorption device 322 respectively store water to adsorb the gas to be recovered that rises through. Generally, the first adsorption device 312 and the second adsorption device 322 may respectively form an adsorption channel for passing gas, the adsorption channel may be disposed obliquely, an adsorption groove or an adsorption hole may be disposed on a side wall of the adsorption channel, or a screen or an adsorption film may be disposed on a side wall of the adsorption channel, so that water can be stored on the side wall of the adsorption channel, and organic gas in the gas is adsorbed by water on the side wall of the adsorption channel. After adsorbing for a period of time, water is sprayed over the first adsorption device 312 and the second adsorption device 322, so that the solution adsorbed with the organic gas is flushed down by new water, and the new water adsorbs the organic gas again.
Preferably, the first absorbing device 312 may further include a gas-liquid separator, and the treated offgas is further separated by the gas-liquid separator to prevent the water loss in the first recycling unit 31.
The first heat exchanger 7 exchanges heat with the solution in the first accommodating cavity 311 and reduces the temperature; the second heat exchanger 8 exchanges heat with the solution in the second accommodating cavity 321 to reduce the temperature.
The gas in the oven 9 enters the recovery tower 3 through the first exhaust fan 1, the gas inlet channel and the gas inlet 313, and in the process of ascending, the organic gas is adsorbed by the water on the first adsorption device 312 and the second adsorption device 322, and then the solution with the adsorbed organic gas is flushed down after the water is sprayed by the first circulation device 5 and the second circulation device 6.
Recovery system can utilize recovery tower 3 to divide twice to the organic matter gas absorption in the gas, let adsorb more completely, in addition, from oven 9 to the gas that recovery tower 3 flows and the gaseous heat transfer each other that flows out after the adsorption treatment of recovery tower 3, promote the temperature of the gaseous of getting into oven 9, liquid in the recovery tower 3 also with outside heat transfer, it is in the low temperature state to keep the inside temperature of recovery tower 3, whole recovery process is anhydrous and humid air participates in, just also guarantee that the gas that flows into in oven 9 is in low temperature low humidity state, avoid causing the influence to coating machine upper oven 9, the security has been promoted.
The working temperature of the coating machine is generally 110-130 ℃, waste gas containing NMP and moisture is continuously discharged during operation, a first exhaust fan 1 at the section of the oven 9 extracts hot air in the oven 9 and is assisted by part of externally introduced fresh air circulation to achieve the purpose of drying the pole pieces, and the fresh air is heated to the process temperature in an electric, steam, oil and other modes. The gas-gas heat exchanger 2 takes high-temperature waste gas generated by the coating machine as a heat source, fresh air entering the coating machine is heated through the gas-gas heat exchanger 2, and the temperature rise of the heated fresh air can reach over 50 ℃.
The gas-gas heat exchanger 2 is a plate heat exchanger, so that the heat exchange area of gas can be increased, the heat exchange efficiency is increased, and the gas entering the oven 9 is ensured to be dry.
The first circulation device 5 includes a circulation pump 51 located outside the recovery tower 3, the circulation pump 51 communicates with the first receiving chamber 311 and the space above the first adsorption device 312 in the first recovery device 31, the solution in the first receiving chamber 311 is pumped to the upper part of the first adsorption device 312 and sprayed onto the first adsorption device 312, and the solution continues to adsorb organic matter gas. The liquid in the tower is introduced into the first adsorption device 312 by the circulating pump 51 for cyclic utilization, so that heat energy replacement is fully performed, waste of water resources can be effectively reduced, and the concentration of the NMP recovery liquid is convenient to improve.
The recycling system further comprises a recycling container 52 communicated with the circulating pump 51, when the concentration of the organic gas absorbed by the solution in the first receiving cavity 311 reaches the standard, the organic gas is pumped out to the recycling container 52 and is not recycled, and after the organic gas is pumped out, new purified water is sprayed onto the first absorbing device 312 to perform the absorption cycle again.
The first heat exchanger 7 comprises a closed cooling tower, the first accommodating cavity 311 is communicated with the closed cooling tower through a pipeline, and a first cooling pump 71 is arranged on the pipeline communicated between the first accommodating cavity 311 and the closed cooling tower, so that the solution in the first accommodating cavity 311 circularly flows, and exchanges heat with circulating cooling water in the closed cooling tower for cooling.
The first heat exchanger 7 keeps the temperature of the solution in the first containing cavity 311 at a low temperature state, so as to prevent the organic gas adsorbed in the solution from volatilizing.
Further, the second heat exchanger 8 is installed on the circulation loop of the second circulation device 6, and when the solution in the second accommodation cavity 321 flows circularly, the solution exchanges heat with the circulating cooling water in the second heat exchanger 8 to be cooled, and the second heat exchanger 8 keeps the temperature of the solution in the second accommodation cavity 321 at a low temperature state, so that the organic gas adsorbed in the solution is prevented from volatilizing. Preferably, the second heat exchanger 8 is a plate-type liquid-liquid heat exchanger, so that the heat exchange area and the heat exchange efficiency are improved.
The second circulation device 6 includes a second cooling pump 61 installed on the circulation loop of the second circulation device 6, and circulates the solution in the first receiving chamber 311 to exchange heat with the circulating cooling water in the second heat exchanger 8 for cooling.
Most of the organic gas entering the recovery tower 3 is adsorbed by the first recovery device 31, and only a small part of the organic gas rises to the second recovery device 32, so that the concentration of the organic gas contained in the solution in the second containing cavity 321 is low, and the solution can be circulated for a long time without being discharged and recovered. Further, since the concentration of the organic gas contained in the solution in the second housing chamber 321 is low, the cooling and circulation of the solution in the second housing chamber 321 can be realized in the circuit of the second circulation device 6, and the energy for circulating the solution can be reduced without causing volatilization.
Preferably, the upper end of the first recovery unit 31 is provided with a ventilation pipe 314 extending upward into the second recovery unit 32, and the second receiving cavity 321 is disposed around the ventilation pipe 314. The upward extension of the vent pipe 314 does not affect the upward flow of the gas and the circulation flow of the solution in the second receiving cavity 321.
Furthermore, the upper end of the vent pipe 314 is provided with a blocking cover 315 for preventing the liquid on the second adsorption device 322 from flowing into the vent pipe 314, so that the solution circularly flowing in the second recovery device 32 can be prevented from entering the second recovery device 32, the total amount of the solution in the second recovery device 32 is kept from being reduced, and stable adsorption is ensured.
The recovery tower 3 is in a tower shape, waste gas enters from the bottom of the tower and is adsorbed by the solution in the first containing cavity 311, and NMP in the waste gas is basically dissolved in water and water vapor. The treated exhaust is then separated by the first adsorption unit 312 and rinsed through the overhead second adsorption unit 322 to allow NMP in the exhaust to be completely adsorbed.
Because the temperature of the waste gas entering from the bottom of the tower is high, NMP needs to be completely recovered, and an energy replacement process exists, so that a part of water is evaporated in the process of recovering the NMP.
The tower body can be customized according to customer's requirement, and tower body diameter is big more, and waste gas absorption capacity is big more.
Waste gas is basically absorbed completely through the first recovery device 31 once, and then passes through the second adsorption device 322, so that the recovery rate of NMP can reach more than 99%, the treated waste gas can be directly emptied without other treatments, and zero emission can be basically realized.
Generally, the temperature of the exhaust gas is reduced to 35 ℃ after the exhaust gas is cooled and recovered by the first stage of the first recovery unit 31, and the temperature of the exhaust gas is reduced to 15 ℃ after the exhaust gas is cooled and recovered by the second stage of the first recovery unit 31.
It is to be understood that the above-described respective technical features may be used in any combination without limitation.
The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.
Claims (10)
1. A system for recycling organic gas of an upper-layer drying oven of a coating machine is characterized by comprising a first exhaust fan (1), a gas-gas heat exchanger (2), a recycling tower (3), a second exhaust fan (4), a first circulating device (5), a second circulating device (6), a first heat exchanger (7) and a second heat exchanger (8);
the recovery tower (3) comprises a first recovery device (31) and a second recovery device (32) positioned at the upper part of the first recovery device (31);
a first accommodating cavity (311) positioned at the bottom and a first adsorption device (312) positioned above the first accommodating cavity (311) are arranged in the first recovery device (31);
a second containing cavity (321) positioned at the bottom and a second adsorption device (322) positioned above the second containing cavity (321) are arranged in the second recovery device (32);
the upper end of the first adsorption device (312) is communicated with the lower space of the second adsorption device (322) in the second recovery device (32);
an air outlet (91) and an air inlet (92) are formed in the oven (9), the first exhaust fan (1) is communicated with the air outlet (91) of the oven (9), and the gas-gas heat exchanger (2) is provided with an air inlet channel and an air outlet channel; an air inlet (313) is formed in the side wall of the first recovery device (31), and an air outlet (323) is formed in the top of the second recovery device (32);
two ends of the air inlet channel are respectively communicated with the first exhaust fan (1) and the air inlet (313), two ends of the air outlet channel are respectively communicated with the air inlet (92) and the second exhaust fan (4), the first exhaust fan (1) is communicated with the air outlet (91), and the second exhaust fan (4) is communicated with the air outlet (323);
the first circulating device (5) is respectively communicated with the first accommodating cavity (311) and the space above the first adsorption device (312) in the first recovery device (31) so as to pump the solution in the first accommodating cavity (311) to the position above the first adsorption device (312) and spray the solution onto the first adsorption device (312);
the second circulating device (6) is respectively communicated with the second accommodating cavity (321) and the space above the second adsorption device (322) in the second recovery device (32) so as to pump the solution in the second accommodating cavity (321) to the position above the second adsorption device (322) and spray the solution onto the second adsorption device (322);
the first adsorption device (312) and the second adsorption device (322) respectively store water so as to adsorb the gas to be recovered which ascends and passes through;
the first heat exchanger (7) exchanges heat with the solution in the first accommodating cavity (311) and reduces the temperature; and the second heat exchanger (8) exchanges heat with the solution in the second accommodating cavity (321) and reduces the temperature.
2. The organic gas recycling system of the coating machine upper oven according to claim 1, wherein the upper end of the first recycling device (31) is provided with a vent pipe (314) extending upwards into the second recycling device (32), and the second receiving cavity (321) is arranged around the vent pipe (314).
3. The organic gas recovery system for the coater topping oven of claim 2, wherein the upper end of the vent pipe (314) is provided with a shielding cover (315) for preventing the liquid on the second adsorption device (322) from flowing into the vent pipe (314).
4. A coater topping oven organic gas recovery system according to any one of claims 1 to 3, wherein the gas-gas heat exchanger (2) is a plate heat exchanger.
5. A coater upper oven organic gas recovery system according to any one of claims 1 to 3, wherein the first circulation device (5) comprises a circulation pump (51) located outside the recovery tower (3), and the circulation pump (51) is communicated with the first receiving cavity (311) and the space above the first adsorption device (312) in the first recovery device (31).
6. A coater topping oven organic gas recovery system according to claim 5, wherein the recovery system further comprises a recovery vessel (52) in communication with the circulation pump (51).
7. The organic gas recovery system for the upper layer drying oven of the coating machine according to any one of claims 1 to 3, wherein the first heat exchanger (7) comprises a closed cooling tower, the first receiving cavity (311) is communicated with the closed cooling tower through a pipeline, and a first cooling pump (71) is arranged on the pipeline communicated between the first receiving cavity (311) and the closed cooling tower, so that the solution in the first receiving cavity (311) flows circularly and exchanges heat with the circulating cooling water in the closed cooling tower for cooling.
8. A coater topping oven organic gas recovery system according to any one of claims 1 to 3, wherein the second heat exchanger (8) is installed on the circulation loop of the second circulation device (6).
9. A coater topping oven organic gas recovery system according to claim 8, wherein the second heat exchanger (8) is a plate liquid-liquid heat exchanger.
10. A coater topping oven organic gas recovery system according to claim 8, wherein the second circulating means (6) comprises a second cooling pump (61) installed on the circulation loop of the second circulating means (6) to circulate the solution in the first receiving chamber (311) for heat exchange cooling with the circulating cooling water in the second heat exchanger (8).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921032313.XU CN210278712U (en) | 2019-07-03 | 2019-07-03 | Organic gas recovery system for upper-layer drying oven of coating machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921032313.XU CN210278712U (en) | 2019-07-03 | 2019-07-03 | Organic gas recovery system for upper-layer drying oven of coating machine |
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| Publication Number | Publication Date |
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| CN210278712U true CN210278712U (en) | 2020-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921032313.XU Withdrawn - After Issue CN210278712U (en) | 2019-07-03 | 2019-07-03 | Organic gas recovery system for upper-layer drying oven of coating machine |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252089A (en) * | 2019-07-03 | 2019-09-20 | 深圳市百瑞空气处理设备有限公司 | Coating machine upper layer baking oven organic gas recovery system |
| CN114871078A (en) * | 2022-05-18 | 2022-08-09 | 三一技术装备有限公司 | Fresh air system of oven |
-
2019
- 2019-07-03 CN CN201921032313.XU patent/CN210278712U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110252089A (en) * | 2019-07-03 | 2019-09-20 | 深圳市百瑞空气处理设备有限公司 | Coating machine upper layer baking oven organic gas recovery system |
| CN114871078A (en) * | 2022-05-18 | 2022-08-09 | 三一技术装备有限公司 | Fresh air system of oven |
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