NMP heat exchange recovery system

Abstract

The utility model relates to the technical field of waste gas recovery treatment, in particular to an NMP heat exchange recovery system which comprises a tail exhaust structure and further comprises a first heat exchange structure, a second heat exchange structure and a recovery treatment structure which are sequentially connected to the tail exhaust structure. The first heat exchange structure comprises a supporting frame, a plurality of hot side heat exchange channels arranged in the height direction of the supporting frame and a plurality of cold side heat exchange channels. A hot side filtering air inlet assembly connected to the tail exhaust structure is arranged at one end of the hot side heat exchange channel. The hot side filtering air inlet assembly comprises a hot side air inlet channel and a hot side filter arranged on the hot side air inlet channel. A cold side filtering air inlet assembly is arranged at one end of the cold side heat exchange channel and comprises a cold side air inlet channel and a cold side filter arranged on the cold side air inlet channel. Filtering, flow guiding and heat exchanging functions are integrated through the first heat exchanging structure, the installation occupied space needed by the waste gas treatment equipment can be effectively reduced, and the heat exchanging efficiency and the heat exchanging quality of unit area are improved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of waste gas recovery treatment, and particularly relates to an NMP heat exchange recovery system. BACKGROUND

[0002] A large amount of tailing high-temperature waste gas is released in the lithium battery production process, and the tailing waste gas needs to be subjected to heat exchange recovery treatment. At present, the heat exchange recovery process for the NMP tailing waste gas is as follows: the tailing waste gas is filtered and then guided into a heat exchanger to be subjected to heat exchange, the tailing waste gas subjected to heat exchange is guided into a condenser to recover NMP, and the tailing waste gas subjected to recovery is guided into a tail gas treatment tower or a rotating wheel to be subjected to further treatment. Since the heat exchange recovery device needs to guide the waste gas into a filtering structure, a guiding structure and a heat exchange structure to be subjected to treatment, on the one hand, these structures need to occupy a large installation space, which is not conducive to the miniaturization development of the equipment, and on the other hand, the heat exchange efficiency of the aluminum heat exchanger is limited, and it is difficult to meet the treatment demand of the increasing waste gas. CONTENT OF THE UTILITY MODEL

[0003] The application aims to provide an NMP heat exchange recovery system, and aims to improve the problem that the heat exchange recovery system needs to occupy a large installation space in the related art, and improve the heat exchange efficiency of the heat exchange recovery system.

[0004] The application provides an NMP heat exchange recovery system, which comprises a tailing structure, and further comprises a first heat exchange structure, a second heat exchange structure and a recovery treatment structure which are sequentially connected to the tailing structure; the first heat exchange structure comprises a support frame, a plurality of hot-side heat exchange channels arranged along the height direction of the support frame and a plurality of cold-side heat exchange channels; one end of the hot-side heat exchange channel is provided with a hot-side filtering air inlet assembly connected to the tailing structure, the hot-side filtering air inlet assembly comprises a hot-side air inlet channel and a hot-side filter arranged in the hot-side air inlet channel; one end of the cold-side heat exchange channel is provided with a cold-side filtering air inlet assembly, and the cold-side filtering air inlet assembly comprises a cold-side air inlet channel and a cold-side filter arranged in the cold-side air inlet channel.

[0005] Further, the plurality of hot-side heat exchange channels and the plurality of cold-side heat exchange channels are uniformly arranged along the height direction of the support frame; the plurality of hot-side heat exchange channels and the plurality of cold-side heat exchange channels are alternately arranged.

[0006] Further, the hot-side heat exchange channel comprises a plurality of hot-side sub heat exchange channels which are separated from each other; and the cold-side heat exchange channel comprises a plurality of cold-side sub heat exchange channels which are separated from each other.

[0007] Further, the hot-side air inlet channel has a hot-side air inlet and a hot-side air outlet, the hot-side air outlet is communicated with the hot-side heat exchange channel, and the hot-side filter is arranged in the hot-side air inlet; a hot-side buffer portion is connected between the hot-side air inlet and the hot-side air outlet.

[0008] Further, the size of the hot side buffer portion gradually decreases from the side of the hot side air inlet to the side of the hot side air outlet.

[0009] Further, the second heat exchange structure includes an aluminum heat exchanger, and the hot side heat exchange channel and the cold side heat exchange channel are connected to the aluminum heat exchanger.

[0010] Further, the recovery processing structure includes a condenser connected to the aluminum heat exchanger, an air guide pipe connected to the condenser, and an exhaust gas treatment tower connected to the air guide pipe.

[0011] Further, the backflow structure includes a backflow fan connected to the aluminum heat exchanger, and the backflow fan is connected to a backflow air pipe connected to the aluminum heat exchanger, and the backflow air pipe is provided with a backflow air valve.

[0012] The beneficial effects of the present application are:

[0013] 1. The NMP heat exchange recovery system of the present application, by sequentially connecting the first heat exchange structure, the second heat exchange structure and the recovery processing structure in the exhaust structure, using the hot side filter air inlet assembly and the cold side filter air inlet assembly of the first heat exchange structure to filter and guide the exhaust gas and natural wind, the exhaust gas enters from the hot side filter air inlet assembly, the exhaust gas passes through the hot side filter and enters the hot side heat exchange channel through the hot side air inlet channel, and the fresh air passes through the cold side filter and enters the cold side heat exchange channel through the cold side air inlet channel. The heat exchange channel can pre-heat the exhaust gas and fresh air, thereby improving the processing speed and processing capacity of the exhaust gas gas in cooperation with the subsequent second heat exchange assembly. The integration of filtering, guiding and heat exchange functions can effectively reduce the installation space required by the exhaust gas treatment equipment, improve the heat exchange efficiency and heat exchange quality per unit area.

[0014] 2. The NMP heat exchange recovery system of the present application, by setting the backflow structure, using the backflow fan to re-pump part of the gas passing through the condenser to the aluminum heat exchanger for reheat. Since the gas condensed by the condenser has a lower temperature, this part of the gas can more effectively exchange heat with the exhaust gas after entering the aluminum heat exchanger. On the basis of ensuring the internal gas pressure of the system, multi-stage heat exchange is realized, and the system stability and heat exchange efficiency are improved.

[0015] 3. By setting the hot side buffer part, using the gradually reduced hot side buffer part, that is, the larger side of the hot side buffer part is the hot side air inlet, and the smaller side of the hot side buffer part is the hot side air outlet, so that the hot side air inlet can have a larger air inlet area to allow more gas to enter, and after the gas enters the hot side air inlet, it is accelerated to flow and gather to the hot side air outlet into the hot side heat exchange channel under the action of the hot side buffer part, on the basis of ensuring the heat exchange efficiency of the flow guide heat exchange purifier, the flow guide heat exchange purifier is compact in structure, reduces the installation area, and helps the heat exchange recovery system to realize small size and light weight. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a structural schematic diagram of an NMP heat exchange recovery system provided by an embodiment of the present application;

[0017] Figure 2 is a structural schematic diagram of a first heat exchange structure in the embodiment of the present application;

[0018] Figure 3 is another structural schematic diagram of the first heat exchange structure in the embodiment of the present application;

[0019] Figure 4 is Figure 2 is a partial enlarged schematic diagram of part A in

[0020] BRIEF DESCRIPTION OF DRAWINGS

[0021] 1, tail exhaust structure; 11, tail exhaust fan; 12, tail exhaust air valve; 2, first heat exchange structure; 21, support frame; 22, hot side heat exchange channel; 221, hot side sub-heat exchange channel; 23, cold side heat exchange channel; 231, cold side sub-heat exchange channel; 24, hot side filter air inlet assembly; 241, hot side air inlet channel; 2411, hot side buffer part; 242, hot side filter; 243, hot side connecting piece; 2431, first limiting piece; 2432, second limiting piece; 25, cold side filter air inlet assembly; 251, cold side air inlet channel; 252, cold side filter; 253, cold side connecting piece; 3, second heat exchange structure; 31, aluminum heat exchanger; 32, exhaust air pipe; 4, recovery treatment structure; 41, condenser; 42, air duct; 43, tail gas treatment tower; 5, backflow structure; 51, backflow fan; 52, backflow air pipe. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical scheme and advantages of the present application more clear and explicit, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0023] It should be noted that although the functional modules are divided in the device schematic diagram, the logical order is shown in the flowchart, but in some cases, the steps shown or described can be performed in a manner different from the module division in the device or the order in the flowchart. The terms "first", "second", and the like in the specification and claims and the above-described drawings are used to distinguish similar objects, and do not necessarily describe a specific order or sequence.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the specification is for the purpose of describing embodiments of the present application only and is not intended to be limiting of the present application.

[0025] Referring to Figure 1 , the present application provides an NMP heat exchange recovery system, comprising a tail exhaust structure 1, further comprising a first heat exchange structure 2, a second heat exchange structure 3 and a recovery treatment structure 4 connected to the tail exhaust structure 1 in turn. When the heat exchange recovery system is running, the exhaust gas discharged from the tail exhaust structure 1 enters the first heat exchange structure 2 and the second heat exchange structure 3 in turn for heat exchange, and the exhaust gas after heat exchange enters the recovery treatment structure 4 for recovery treatment.

[0026] Specifically, the tail exhaust structure 1 comprises a tail exhaust pipeline, a tail exhaust fan 11 and a tail exhaust air valve 12 arranged in the tail exhaust pipeline, the tail exhaust fan 11 runs to draw exhaust gas into the tail exhaust pipeline, and the tail exhaust air valve 12 can control the opening degree to control the on-off of the tail exhaust pipeline. The exhaust gas enters the first heat exchange structure 2 through the tail exhaust pipeline.

[0027] Referring to Figure 2 , Figure 3 and Figure 4 , the first heat exchange structure 2 comprises a support frame 21, a plurality of hot side heat exchange channels 22 and a plurality of cold side heat exchange channels 23 arranged along the height direction of the support frame 21, one end of the hot side heat exchange channel 22 is provided with a hot side filter air inlet assembly 24, one end of the cold side heat exchange channel 23 is provided with a cold side filter air inlet assembly 25, and the hot side filter air inlet assembly 24 abuts one side of the cold side filter air inlet assembly 25. The tail exhaust gas enters the hot side filter air inlet assembly 24 through the tail exhaust pipeline, and then enters the hot side heat exchange channel 22. The natural wind enters the cold side heat exchange channel 23 through the cold side filter air inlet assembly 25, and the tail exhaust gas and the natural wind are heat exchanged in the corresponding heat exchange channels.

[0028] The support frame 21 comprises an inner frame body for mounting the hot-side heat exchange channels 22 and the cold-side heat exchange channels 23, and an outer frame body for mounting the hot-side filter air inlet assembly 24 and the cold-side filter air inlet assembly 25. To ensure heat exchange efficiency, the hot-side heat exchange channels 22 and the cold-side heat exchange channels 23 are arranged alternately, i.e., the hot-side heat exchange channels 22 are adjacent to the cold-side heat exchange channels 23, and the cold-side heat exchange channels 23 are adjacent to the hot-side heat exchange channels 22. The hot-side heat exchange channels 22 comprise a plurality of hot-side sub heat exchange channels 221 separated from each other, the cold-side heat exchange channels 23 comprise a plurality of cold-side sub heat exchange channels 231 separated from each other, and the hot-side heat exchange channels 22 and the cold-side heat exchange channels 23 are uniformly arranged along the height direction of the support frame 21. By arranging the hot-side heat exchange channels 22 and the cold-side heat exchange channels 23 in this way, the heat exchange area of the tail exhaust gas and the natural wind can be effectively increased, thereby ensuring the heat exchange efficiency.

[0029] The hot-side filter air inlet assembly 24 and the cold-side filter air inlet assembly 25 are used for filtering and guiding the tail exhaust gas and the natural wind. Specifically, the hot-side filter air inlet assembly 24 comprises a hot-side air inlet channel 241 and a hot-side filter 242 arranged in the hot-side air inlet channel 241, and the cold-side filter air inlet assembly 25 comprises a cold-side air inlet channel 251 and a cold-side filter 252 arranged in the cold-side air inlet channel 251. In this embodiment, the structure of the cold-side air inlet channel 251 is the same as that of the hot-side air inlet channel 241, and the axis of the cold-side air inlet channel 251 is perpendicular to the axis of the hot-side air inlet channel 241.

[0030] Taking the hot-side filter air inlet assembly 24 as an example, the hot-side air inlet channel 241 has a hot-side air inlet and a hot-side air outlet, the hot-side air outlet is communicated with the hot-side heat exchange channel 22, the hot-side filter 242 is arranged in the hot-side air inlet, and the hot-side filter 242 comprises a primary filter and an intermediate filter. The hot-side air inlet and the hot-side air outlet are connected with a hot-side buffer portion 2411. In order to ensure the air inlet amount and the heat exchange efficiency, the size of the hot-side buffer portion 2411 gradually decreases from one side of the hot-side air inlet to the other side of the hot-side air outlet, i.e., the larger side of the hot-side buffer portion 2411 is the hot-side air inlet, and the smaller side of the hot-side buffer portion 2411 is the hot-side air outlet. Therefore, the hot-side air inlet can have a larger air inlet area to allow more gas to enter. After the gas enters the hot-side air inlet, it is accelerated to flow and gather to the hot-side air outlet into the hot-side heat exchange channel 22 under the action of the hot-side buffer portion 2411.

[0031] In order to ensure that the purifier has a compact structure and is easy to maintain, a plurality of hot-side air inlets are close to each other and abutted, and a plurality of hot-side air inlets surround to form an air inlet surface. When the hot-side filter 242 is installed, a plurality of hot-side filters 242 are close to each other to form a filter surface with a larger area, thereby being able to accommodate more gas.

[0032] The hot side filter 242 is embeddedly installed in the outer frame body, and the hot side filter air inlet assembly 24 further comprises a hot side connecting piece 243, which comprises a first limiting piece 2431 detachably connected to the outer frame body of the support frame 21 and a second limiting piece 2432. In this embodiment, the first limiting piece 2431 is an L-shaped baffle, which is installed on the outer frame body in a threaded connection manner and limits and abuts against the hot side filter 242, thereby limiting the hot side filter 242 in the air inlet direction; the second limiting piece 2432 is a long rectangular cross-section baffle, which is installed on the outer frame body in an interference fit manner and limits and abuts against the hot side filter 242, thereby limiting the hot side filter 242 on the side perpendicular to the air inlet direction.

[0033] By arranging the hot side filter air inlet assembly 24 in this way, the hot side filter 242 is supported and limited by the hot side connecting piece 243, and when the hot side filter 242 needs to be cleaned and maintained, the hot side filter 242 can be removed from the support frame 21 by loosening the hot side connecting piece 243 to release the limitation of the hot side filter 242, so that the specific hot side filter 242 can be cleaned or replaced, thereby ensuring the convenience of installation and maintenance of the purifier.

[0034] The cold side filter air inlet assembly 25 comprises a corresponding cold side air inlet channel 251, a cold side filter 252 and a cold side connecting piece 253. The cold side air inlet channel 251 has the same structure as the hot side air inlet channel 241, the cold side filter 252 has the same structure as the hot side filter 242, and the cold side connecting piece 253 has the same structure as the hot side connecting piece 243, which will not be described again.

[0035] Through the pre-heating of the first heat exchange structure 2, the temperature of the exhaust gas can be effectively reduced, and the first heat exchange structure 2 cooperates with the second heat exchange structure 3 to effectively increase the treatment efficiency of the exhaust gas, thereby being able to adapt to the treatment of more exhaust gas. At the same time, the first heat exchange structure 2 integrates the functions of filtering, flow guiding and heat exchange, which can effectively reduce the installation space required by the exhaust gas treatment equipment, improve the heat exchange efficiency and quality per unit area.

[0036] The second heat exchange structure 3 comprises an aluminum heat exchanger 31, and the hot side heat exchange channel 22 and the cold side heat exchange channel 23 are respectively connected to the aluminum heat exchanger 31. The aluminum heat exchanger 31 is connected with an exhaust pipe 32, and the exhaust pipe 32 is provided with an exhaust valve for controlling the opening degree thereof. The exhaust gas after heat exchange through the hot side heat exchange channel 22 enters the aluminum heat exchanger 31, and the natural wind after heat exchange through the cold side heat exchange channel 23 enters the aluminum heat exchanger 31, and the exhaust gas and the natural wind are subjected to secondary heat exchange in the aluminum heat exchanger 31, so that the temperature of the exhaust gas is further reduced.

[0037] Review Figure 1 The recycling treatment structure 4 includes a condenser 41 connected to the aluminum heat exchanger 31, an air duct 42 connected to the condenser 41, and an exhaust gas treatment tower 43 connected to the air duct 42. The exhaust gas enters the condenser 41 and the exhaust gas treatment tower 43 in sequence after passing through the second heat exchange structure 3 for recycling and treatment. It can be understood that the exhaust gas treatment tower 43 can be replaced by a rotating device to treat the exhaust gas.

[0038] It is worth mentioning that in order to improve the heat exchange efficiency and ensure the internal gas pressure of the system, the heat exchange recycling system further includes a backflow structure 5. The backflow structure 5 includes a backflow fan 51 connected to the aluminum heat exchanger 31, the backflow fan 51 is connected with a backflow air pipe 52, the backflow air pipe 52 is connected to the aluminum heat exchanger 31, and the backflow air pipe 52 is provided with a backflow air valve for controlling the opening degree of the backflow air pipe 52. In the embodiment, the backflow air pipe 52 is connected with the outlet of the cold side heat exchange channel 23 at the same time, so that the backflow air pipe can mix part of the gas passing through the condenser 41 with the natural wind, so that the temperature of the natural wind is further reduced and then returned to the aluminum heat exchanger 31, thereby increasing the heat exchange efficiency.

[0039] The above specifically shows and describes the exemplary embodiments of the present disclosure. It can be understood that the present disclosure is not limited to the detailed structure, arrangement or implementation method described herein; on the contrary, the present disclosure is intended to cover various modifications and equivalent arrangements within the spirit and scope of the appended claims.

Claims

1. An NMP heat exchange and recovery system, comprising a tailpipe structure (1), characterized in that, It also includes a first heat exchange structure (2), a second heat exchange structure (3), and a recycling and processing structure (4) connected sequentially to the tail section structure (1); the first heat exchange structure (2) includes a support frame (21), a plurality of hot-side heat exchange channels (22) and a plurality of cold-side heat exchange channels (23) arranged along the height direction of the support frame (21); one end of the hot-side heat exchange channel (22) is provided with a hot-side filter air inlet assembly (24) connected to the tail section structure (1), the hot-side filter air inlet assembly (24) includes a hot-side air inlet channel (241) and a hot-side filter (242) arranged in the hot-side air inlet channel (241); one end of the cold-side heat exchange channel (23) is provided with a cold-side filter air inlet assembly (25), the cold-side filter air inlet assembly (25) includes a cold-side air inlet channel (251) and a cold-side filter (252) arranged in the cold-side air inlet channel (251).

2. The NMP heat exchange and recovery system according to claim 1, characterized in that, A plurality of the hot-side heat exchange channels (22) and a plurality of the cold-side heat exchange channels (23) are uniformly arranged along the height direction of the support frame (21); the plurality of the hot-side heat exchange channels (22) and the plurality of the cold-side heat exchange channels (23) are alternately arranged.

3. The NMP heat exchange and recovery system according to claim 2, characterized in that, The hot-side heat exchange channel (22) includes a plurality of mutually separated hot-side sub-heat exchange channels (221); the cold-side heat exchange channel (23) includes a plurality of mutually separated cold-side sub-heat exchange channels (231).

4. The NMP heat exchange and recovery system according to claim 1, characterized in that, The hot-side air inlet channel (241) has a hot-side air inlet and a hot-side air outlet. The hot-side air outlet is connected to the hot-side heat exchange channel (22). The hot-side filter (242) is disposed at the hot-side air inlet. A hot-side buffer section (2411) is connected between the hot-side air inlet and the hot-side air outlet.

5. The NMP heat exchange and recovery system according to claim 4, characterized in that, The size of the hot-side buffer section (2411) gradually decreases from the hot-side air inlet side to the hot-side air outlet side.

6. An NMP heat exchange and recovery system according to any one of claims 1-5, characterized in that, The second heat exchange structure (3) includes an aluminum heat exchanger (31), and the hot-side heat exchange channel (22) and the cold-side heat exchange channel (23) are respectively connected to the aluminum heat exchanger (31).

7. The NMP heat exchange and recovery system according to claim 6, characterized in that, The recycling structure (4) includes a condenser (41) connected to the aluminum heat exchanger (31), an exhaust duct (42) connected to the condenser (41), and a tail gas treatment tower (43) connected to the exhaust duct (42).

8. The NMP heat exchange and recovery system according to claim 6, characterized in that, It also includes a reflux structure (5), which includes a reflux fan (51) connected to the aluminum heat exchanger (31), the reflux fan (51) being connected to a reflux duct (52), the reflux duct (52) being connected to the aluminum heat exchanger (31), and the reflux duct (52) being provided with a reflux valve.

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