CN216261732U

CN216261732U - NMP energy-saving circulating system of lithium battery pole piece coating machine

Info

Publication number: CN216261732U
Application number: CN202122312641.9U
Authority: CN
Inventors: 陈望伟; 柳亚水
Original assignee: Dongguan Pengjin Machinery Technology Co ltd
Current assignee: Dongguan Pengjin Machinery Technology Co ltd
Priority date: 2021-09-23
Filing date: 2021-09-23
Publication date: 2022-04-12
Anticipated expiration: 2031-09-23

Abstract

The utility model discloses an NMP energy-saving circulating system of a lithium battery pole piece coating machine, which comprises a first heat exchanger, a second heat exchanger, the coating machine, a condensation host, an NMP storage tank and a rectifying tower, wherein the coating machine, the condensation host, the NMP storage tank and the rectifying tower are sequentially communicated; the method can reduce the energy consumption in the process of recovering the NMP and reduce the production cost.

Description

NMP energy-saving circulating system of lithium battery pole piece coating machine

Technical Field

The utility model relates to the technical field of waste gas treatment, in particular to an NMP energy-saving circulating system of a lithium battery pole piece coating machine.

Background

In the production of the positive pole piece of the lithium ion battery, the electrode material is usually mixed by NMP to prepare slurry; after the slurry is coated, NMP on the electrode plate is dried by high-temperature air, and then the NMP is separated from the waste gas in a condensation recovery mode. The temperature of the air after the removal of most NMP and the heat exchange of the air exhausted by the coating machine is about 50-80 ℃, and the temperature of the electrode plate dried by the coating machine is usually 100-130 ℃, so that the air needs to be heated to reach the temperature required by the drying process before returning to the coating machine. On the other hand, NMP after retrieving is purified through the mode of rectification, and when the rectification, the temperature of top of the tower material steam is between 100 ~ 160 ℃, and these heats are taken away through cooling water or refrigerated water usually for material steam condensation leads to the top of the tower heat to be useless like this, and energy resource consumption is big, increases the cost in business.

SUMMERY OF THE UTILITY MODEL

In view of the above, the present invention provides an NMP energy-saving circulation system of a lithium battery pole piece coater, which can reduce energy consumption in the NMP recovery process and reduce production cost.

In order to achieve the purpose, the utility model adopts the following technical scheme:

the utility model provides a lithium battery pole piece coating machine's NMP energy-saving circulation system, includes first heat exchanger, second heat exchanger and the coating machine, condensation host computer, NMP storage tank and the rectifying column that communicate in proper order, the waste gas discharge mouth and the condensation host computer waste gas import of coating machine are through first pipe connection, condensation host computer gas outlet is connected through the air inlet of second pipeline with the coating machine, the rectifying column top is equipped with rectification return line, rectification return line loops through condenser, reflux drum, backwash pump and adopts export and rectifying column upper end backward flow entry intercommunication with rectifying column top, the export is adopted at rectifying column top and the condenser entry passes through the third pipe connection, first pipeline and second pipeline all carry out the heat transfer through first heat exchanger, second pipeline and third pipeline all carry out the heat transfer through the second heat exchanger.

As a preferred scheme, a liquid outlet at the lower end of the NMP storage tank is connected with a middle material inlet of the rectifying tower through a fourth pipeline.

Preferably, the fourth pipeline is provided with a feed pump which can convey the recovered liquid of the NMP storage tank into the rectifying tower.

As a preferred scheme, the outlet of the reflux pump is also connected with a discharge pipe, and the discharge pipe is connected with a finished product storage tank.

Compared with the prior art, the utility model has obvious advantages and beneficial effects, and concretely, according to the technical scheme, the second heat exchanger is arranged through the third pipeline arranged between the extraction opening at the top of the rectifying tower and the condenser, the high-temperature mixed gas passing through the second heat exchanger from the third pipeline exchanges heat with the low-temperature mixed gas which is condensed and then flows back to the coating machine through the second pipeline, so that the heat required by heating the mixed gas flowing back to the coating machine to dry the battery pole piece can be reduced, the energy consumption in the NMP recovery process is reduced, and the production cost is reduced.

To more clearly illustrate the structural features and effects of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

Drawings

FIG. 1 is a schematic structural diagram of an embodiment of the present invention.

The attached drawings indicate the following:

10. coating machine; 11. a first heat exchanger; 12. a feed pump; 20. a condensing main machine; 30. an NMP storage tank; 40. a rectifying tower; 41. a condenser; 42. a reflux tank; 43. a reflux pump; 44. a second heat exchanger; 45. a finished product storage tank; 51. a first conduit; 52. a second conduit; 53. a third pipeline; 54. a fourth conduit; 55. and (4) discharging the pipe.

Detailed Description

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the positions or elements referred to must have specific orientations, be constructed in specific orientations, and be operated, and thus, should not be construed as limiting the present invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood as appropriate by those of ordinary skill in the art.

Referring to fig. 1, there is shown a specific structure of an embodiment of the present invention, which includes a first heat exchanger 11, a second heat exchanger 44, and a coater 10, a condensing main 20, an NMP storage tank 30, and a rectifying tower 40 connected in sequence, the exhaust gas discharge port of the coater 10 is connected to the exhaust gas inlet of the condensing main unit 20 through a first pipe 51, the air outlet of the condensation host 20 is connected with the air inlet of the coater 10 through a second pipeline 52, a rectification reflux pipeline is arranged at the top of the rectification tower 40, the rectification reflux pipeline sequentially passes through a condenser 41, a reflux tank 42 and a reflux pump 43 to communicate a top outlet of the rectification tower 40 with a reflux inlet at the upper end of the rectification tower 40, the top extraction outlet of the rectifying tower 40 is connected with the inlet of the condenser 41 through a third pipeline 53, the first pipeline 51 and the second pipeline 52 exchange heat through a first heat exchanger, and the second pipeline 52 and the third pipeline 53 exchange heat through a second heat exchanger.

In this embodiment, the lower outlet of the NMP storage tank 30 and the middle inlet of the rectifying tower 40 are connected by a fourth pipe 54. The fourth pipe 54 is provided with a feed pump 12 for feeding the recovered liquid from the NMP tank 30 to the rectifying tower 40. The outlet of the reflux pump 43 is also connected with a discharge pipe 55, and the discharge pipe 55 is connected with the finished product storage tank 45.

In conclusion, the second heat exchanger is arranged through the third pipeline arranged between the top extraction opening and the condenser of the rectifying tower, and the high-temperature mixed gas passing through the second heat exchanger from the third pipeline exchanges heat with the low-temperature mixed gas which is condensed and then flows back to the coating machine through the second pipeline, so that the heat required by heating the mixed gas flowing back to the coating machine to dry the battery pole piece can be reduced, the energy consumption in the NMP recovery process is reduced, and the production cost is reduced.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the technical scope of the present invention.

Claims

1. The utility model provides a lithium battery pole piece coating machine's NMP energy-saving circulation system which characterized in that: coating machine, condensation host computer, NMP storage tank and rectifying column including first heat exchanger, second heat exchanger and intercommunication in proper order, the waste gas discharge port and the condensation host computer waste gas import of coating machine are through first pipe connection, condensation host computer gas outlet is connected through the air inlet of second pipeline with the coating machine, the rectifying column top is equipped with rectification return line, rectification return line loops through condenser, reflux drum, backwash pump and adopts export and rectifying column upper end backward flow entry intercommunication with rectifying column top, the export is adopted on rectifying column top and the condenser entry passes through the third pipe connection, first pipeline and second pipeline all carry out the heat transfer through first heat exchanger, second pipeline and third pipeline all carry out the heat transfer through the second heat exchanger.

2. The NMP energy-saving circulation system of the lithium battery pole piece coating machine according to claim 1, characterized in that: and a liquid outlet at the lower end of the NMP storage tank is connected with a middle feeding port of the rectifying tower through a fourth pipeline.

3. The NMP energy-saving circulation system of the lithium battery pole piece coating machine according to claim 2, characterized in that: and the fourth pipeline is provided with a feed pump which can convey the recovered liquid of the NMP storage tank into the rectifying tower.

4. The NMP energy-saving circulation system of the lithium battery pole piece coating machine according to claim 1, characterized in that: the outlet of the reflux pump is also connected with a discharge pipe, and the discharge pipe is connected with a finished product storage tank.