一种NMP液体回收系统
By introducing a medium-efficiency filter and a ceramic multi-tube dust collector into the NMP recovery system, combined with multi-stage condensation and adsorption technologies, the problem of finned heat exchanger blockage was solved, achieving efficient and high-purity NMP recovery and reducing waste.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 江苏源一工程科技有限公司
- Filing Date
- 2025-05-21
- Publication Date
- 2026-07-17
AI Technical Summary
In existing NMP recovery systems, finned heat exchangers are prone to clogging, resulting in low heat transfer efficiency and the formation of sticky residues, leading to low NMP recovery purity and significant waste.
An NMP liquid recovery system was designed, including a filtration device, a heat exchanger, a cooling device, and a regeneration supply and return air device. Pre-filtration is performed through a medium-efficiency filter and a ceramic multi-tube dust collector. Combined with multi-stage condensation and adsorption technology, the system achieves efficient gas filtration and stepwise NMP recovery.
It effectively intercepts particles larger than 0.1μm, reduces the risk of plate heat exchanger blockage, improves NMP recovery rate and purity, reduces heat transfer loss, and achieves efficient NMP recovery.
Smart Images
Figure CN224506307U_ABST
Abstract
Claims
1. An NMP liquid recovery system comprising a first supply air fan (1), a first exhaust air fan (2), a filtering device (3), a heat exchanger (4), a first cooling device (5), a regeneration supply and return air device (6), a transfer wheel storage tank (8), characterized in that: The output end of the coating machine oven (7) is connected to the input end of the filter device (3) through the first air supply fan (1). The filter device (3) is used to perform preliminary filtration of the gas containing NMP at the output end of the coating machine oven (7). The output end of the filter device (3) is connected to one end of the first heat exchange system (41) of the heat exchanger (4). The other end of the first heat exchange system (41) of the heat exchanger (4) is connected to one end of the regeneration air supply and return device (6) through the first cooling device (5). The other end of the regeneration air supply and return device (6) is connected to the coating machine oven (7) and the first cooling device (5) respectively. The heat exchanger (4) is connected to one end of the regeneration air supply and return device (6). One end of the second heat exchange system (42) of the heat exchanger (4) is connected to the input end of the coating machine oven (7) through the first exhaust fan (2). The heat exchanger (4), the first cooling device (5), and the regeneration air supply and return device (6) are all equipped with liquid recovery trays (9) at the bottom. The liquid recovery trays (9) are connected to the input end of the NMP purification device (10) through pipes. The output end of the NMP purification device (10) is connected to the intermediate turbine storage tank (8). The intermediate turbine storage tank (8) is connected to the external NMP main tank (11).
2. The NMP liquid recovery system of claim 1, wherein: The filtration device (3) includes a medium-efficiency filter (31) and a ceramic multi-tube dust collector (32). The output end of the coating machine oven (7) is connected to the input end of the medium-efficiency filter (31) through the first air blower (1). The output end of the medium-efficiency filter (31) is connected to the input end of the ceramic multi-tube dust collector (32). The output end of the ceramic multi-tube dust collector (32) is connected to one end of the first heat exchange system (41) of the heat exchanger (4). The medium-efficiency filter (31) is used to intercept 1-5μm particles in the output gas of the coating machine oven (7). The ceramic multi-tube dust collector (32) is used to intercept particles smaller than 1μm in the output gas of the medium-efficiency filter (31). The medium-efficiency filter (31) and the ceramic multi-tube dust collector (32) play a pre-filtration role, thereby protecting the heat exchanger (4) from plate heat exchanger blockage and improving heat transfer efficiency.
3. The NMP liquid recovery system of claim 2, wherein: A pre-condenser is also provided between the first air blower (1) and the input end of the medium-efficiency filter (31). The pre-condenser is used to pre-cool the hot air output from the coating machine oven (7) to remove some NMP liquid residue in advance and reduce the risk of sticky substances adhering.
4. The NMP liquid recovery system of claim 1, wherein: The first cooling device (5) includes a first primary filter (51), a first cooling condenser (52), a first refrigeration condenser (53), and a first demister (54). The first heat exchange system (41) of the heat exchanger (4) is connected to one end of the regeneration supply and return air device (6) and the first primary filter (51), the first cooling condenser (52), the first refrigeration condenser (53), and the first demister (54) are arranged in sequence. The first primary filter (51) is used to intercept large particulate impurities in the gas. The first cooling condenser (52) uses room temperature cooling water to initially condense NMP. The first refrigeration condenser (53) uses low temperature refrigerant to deeply condense residual NMP. The first demister (54) is used to separate aerosol droplets.
5. The NMP liquid recovery system of claim 1, wherein: The regeneration air supply and return device (6) includes a first electric valve (61), a second air supply fan (62), an adsorption section (63), an electric preheating section (64), a desorption section (65), an electric heater (66), a regeneration fan (67), and a second cooling device (68). The output end of the first demister (54) is connected to the input end of the adsorption section (63) through the first electric valve (61). The output end of the adsorption section (63) is connected to the input end of the coating machine oven (7) and the electric preheating section (64) through the second air supply fan (62). The output end of the electric preheating section (64) is... The end is connected to the input end of the desorption section (65) via an electric heater (66), the output end of the desorption section (65) is connected to the input end of the second cooling device (68) via a regeneration fan (67), and the output end of the second cooling device (68) is connected to the input end of the adsorption section (63). The adsorption section (63) is used to capture NMP vapor through the adsorption material, the electric preheating section (64) is used to preheat the gas to improve the desorption efficiency, the desorption section (65) is used to desorb NMP at high temperature to achieve adsorbent regeneration, and the electric heater (66) provides a stable heat source for the desorption section (65).
6. The NMP liquid recovery system as described in claim 5, characterized in that: The second cooling device (68) includes a second refrigeration condenser (681) and a second demister (682). The second refrigeration condenser (681) and the second demister (682) are sequentially arranged between the regeneration fan (67) and the input end of the adsorption section (63). The second refrigeration condenser (681) deeply condenses NMP vapor with low temperature refrigerant, and the second demister (682) is used to capture aerosol NMP droplets.
7. The NMP liquid recovery system of claim 1, wherein: The NMP purification device (10) includes a coarse filtration module, a vacuum distillation tower, and a molecular sieve dehydration assembly connected in sequence. The input end of the coarse filtration module is connected to the liquid recovery tray (9) through a pipe, and the output end of the molecular sieve dehydration assembly is connected to the intermediate turbine storage tank (8). The coarse filtration module includes a metal filter screen and a filter bag. The pore size of the metal filter screen is 1-5 mm, and the filtration accuracy of the filter bag is 1-10 μm. The vacuum distillation tower is equipped with a condenser at the top and a waste liquid outlet at the bottom. The molecular sieve dehydration assembly is a regenerable dual-tower structure. When one tower adsorbs water, the other tower desorbs water by heating gas.
8. The NMP liquid recovery system of claim 5, wherein: The second blower (62) is also provided with a check valve (12) at the connection between the coating machine oven (7) and the second blower (62) to prevent gas backflow.
9. The NMP liquid recovery system of claim 1, wherein: The heat exchanger (4), the first cooling device (5), and the second cooling device (68) are all water-cooled.
10. The NMP liquid recovery system of claim 1, wherein: From left to right, a first temperature sensor (13), a first concentration sensor (14), and a first wind speed sensor (15) are arranged between the first air supply fan (1) and the filter device (3). From left to right, a second temperature sensor (16) and a first differential pressure sensor (17) are arranged between the other end of the first heat exchange system (41) of the heat exchanger (4) and the first cooling device (5). From left to right, a third temperature sensor (18) is arranged between the first cooling device (5) and the first electric valve (61). From right to left, a second concentration sensor (19) and a fourth temperature sensor (20) are arranged between one end of the second heat exchange system (42) of the heat exchanger (4) and the first air supply fan (1). From left to right, a fifth concentration sensor (21) and a third wind speed sensor (22) are arranged between the second air supply fan (62) and the check valve (12).