Freezing type NMP recovery all-in-one machine

Abstract

The utility model relates to the technical field of lithium battery waste gas treatment devices, in particular to a freezing type NMP recovery all-in-one machine which comprises a rack and further comprises a filtering assembly, a waste heat recovery assembly, a first cooling assembly, a second cooling assembly and a separation assembly which are arranged on the rack and connected in sequence, and the separation assembly is connected to the waste heat recovery assembly; the first cooling assembly comprises a first cooler and a first cooling pipeline piece connected to the first cooler. The second cooling assembly comprises a second cooler, a second cooling pipeline piece and a liquid receiving base plate, the liquid receiving base plate is arranged on the machine frame in an inclined mode, and the liquid receiving base plate is connected with a liquid receiving and discharging pipe. After entering the all-in-one machine, waste gas is sequentially subjected to filtration, primary cooling, secondary cooling, tertiary cooling and gas-liquid separation, and even a large amount of waste gas can be fully condensed, so that the concentration of NMP in the tail exhaust waste gas is reduced; and meanwhile, the condensed waste gas is returned to the waste heat recovery assembly again to cool the high-temperature waste gas, so that the required energy consumption is effectively reduced.

Description

Technical Field

[0001] This application relates to the technical field of lithium battery waste gas treatment devices, and in particular to a refrigerated NMP recovery integrated machine. Background Technology

[0002] Lithium-ion battery production generates a large amount of waste gas containing NMP, which requires treatment before emission. Currently, the conventional method is to recover NMP from the waste gas using a refrigeration method. This involves passing the waste gas into an NMP recovery and treatment unit, where it is cooled, causing NMP to condense from the waste gas. The NMP is then collected, purified, and recovered. However, conventional NMP recovery and treatment units employ a single-stage cooling structure. The waste gas is discharged after single-stage cooling and condensation. This approach has several drawbacks: firstly, the cooling structure requires rapid cooling of the high-temperature waste gas, leading to increased energy consumption; secondly, when dealing with large volumes of high-temperature waste gas, the single-stage cooling structure struggles to guarantee effective treatment, resulting in residual concentrations in the emitted waste gas exceeding safety standards. Utility Model Content

[0003] The purpose of this application is to provide a refrigerated NMP recovery integrated machine, which aims to improve the problems of high energy consumption and difficulty in handling large amounts of waste gas in related NMP recovery and treatment devices, and improve the treatment effect and efficiency of NMP recovery and treatment devices.

[0004] This application provides a refrigerated NMP recovery integrated machine, including a frame, and further including a filter assembly, a waste heat recovery assembly, a first cooling assembly, a second cooling assembly, and a separation assembly disposed on the frame and connected in sequence. The separation assembly is connected to the waste heat recovery assembly. The first cooling assembly includes a first cooler and a first cooling pipe connected to the first cooler. The second cooling assembly includes a second cooler, a second cooling pipe connected to the second cooler, and a liquid receiving base. The liquid receiving base is disposed on the frame and inclined, and the liquid receiving base is connected to a liquid receiving drain pipe.

[0005] Furthermore, the liquid receiving base is located below the second cooler, and the liquid receiving drain pipe is connected to the lower side of the liquid receiving base; the liquid receiving base is equipped with a liquid level gauge.

[0006] Furthermore, the filtration assembly includes a fan and a plate filter, with one side of the plate filter facing the fan and the other side of the plate filter connected to the waste heat recovery assembly.

[0007] Furthermore, the waste heat recovery component includes a waste heat exchanger with four connection ports: one connection port is connected to the plate filter, one connection port is connected to the first cooler, one connection port is connected to the separation component, and one connection port serves as the outlet air for exhaust.

[0008] Furthermore, the separation assembly includes a wire mesh demister connected to the second cooler and a separation drain pipe connected to the wire mesh demister, the wire mesh demister being connected to a communication port.

[0009] Furthermore, it also includes a detection component, which includes a plurality of temperature sensors located above the first cooler and the second cooler.

[0010] Furthermore, the frame includes a base, a support frame disposed on the base, and a housing covering the support frame; the housing is provided with a viewing mirror and an inspection door.

[0011] The beneficial effects of this application are:

[0012] 1. This application discloses a refrigerated NMP recovery integrated machine, which, by sequentially arranging several functional components on the frame, allows exhaust gas to enter the integrated machine and sequentially pass through a filtration component, a waste heat recovery component, a first cooling component, a second cooling component, and a separation component for filtration, primary cooling, secondary cooling, tertiary cooling, and gas-liquid separation. The waste heat recovery component, the first cooling component, and the second cooling component can cool the exhaust gas step by step, increasing the treatment time of the exhaust gas. Even with a large amount of exhaust gas, sufficient condensation can be ensured, thereby reducing the concentration of NMP in the exhaust gas. The NMP condenses and is collected in an inclined liquid receiving tray and discharged through a liquid receiving and draining pipe. At the same time, the condensed exhaust gas returns to the waste heat recovery component to cool the high-temperature exhaust gas, which can effectively reduce the required energy consumption.

[0013] 2. The present application discloses a refrigerated NMP recovery integrated machine. The separation component is equipped with a wire mesh demister and a separation drain pipe connected to the wire mesh demister. The separation drain pipe discharges the liquid separated by the wire mesh demister, separating it from the receiving drain pipe, thus preventing the two liquids from mixing and facilitating subsequent recovery processes. At the same time, by setting up a detection component, a temperature sensor can effectively monitor the operating temperature of the first cooler and the second cooler, thereby facilitating the operator to operate the integrated machine accordingly based on the operating temperature. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of a refrigerated NMP recovery integrated machine provided in an embodiment of this application;

[0015] Figure 2This is a top view of a refrigerated NMP recovery unit provided in an embodiment of this application;

[0016] Figure 3 This is a side view of a refrigerated NMP recovery unit provided in an embodiment of this application;

[0017] Figure 4 This is a front view of a refrigerated NMP recovery unit provided in an embodiment of this application.

[0018] Explanation of reference numerals in the attached figures:

[0019] 1. Frame; 11. Base; 12. Support frame; 13. Housing; 131. Visual inspection lens; 132. Inspection door; 2. Filter assembly; 21. Fan; 22. Plate filter; 3. Waste heat recovery assembly; 31. Waste heat exchanger; 4. First cooling assembly; 41. First cooler; 42. First cooling pipe; 5. Second cooling assembly; 51. Second cooler; 52. Second cooling pipe; 53. Liquid receiving tray; 531. Liquid receiving drain pipe; 54. Level gauge; 6. Separation assembly; 61. Wire mesh demister; 62. Separation drain pipe; 7. Detection assembly; 71. Temperature sensor. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0021] It should be noted that although functional modules are divided in the device schematic diagram and a logical order is shown in the flowchart, in some cases, the steps shown or described may be performed in a different order than the module division in the device or the order in the flowchart. The terms "first," "second," etc., in the specification, claims, and the aforementioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0022] 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 herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0023] Reference Figure 1 as well as Figure 2This application provides a refrigerated NMP recovery integrated machine, including a frame 1, and further including a filter assembly 2, a waste heat recovery assembly 3, a first cooling assembly 4, a second cooling assembly 5, and a separation assembly 6, which are disposed on the frame 1 and connected in sequence. The separation assembly 6 is connected to the waste heat recovery assembly 3. After the exhaust gas enters the integrated machine, it will sequentially pass through the filter assembly 2, the waste heat recovery assembly 3, the first cooling assembly 4, the second cooling assembly 5, and the separation assembly 6 for filtration, primary cooling, secondary cooling, tertiary cooling, and gas-liquid separation. The waste heat recovery assembly 3, the first cooling assembly 4, and the second cooling assembly 5 can cool the exhaust gas step by step, increasing the treatment time of the exhaust gas and ensuring the treatment effect.

[0024] Specifically, the frame 1 includes a base 11, a support frame 12 disposed on the base 11, and an outer shell 13 covering the support frame 12. The base 11 is formed by splicing profiles and supports the outer shell 13 and the support frame 12. The support frame 12 is formed by profiles and sheet metal parts to create a cavity for installing various components. One side of the support frame 12 has an air inlet, and the other side has an air outlet. The outer shell 13 covers the outside of the support frame 12, and the support frame 12 and the outer shell 13 are connected and fitted together above the base 11 to form a sealed space. The outer shell 13 is equipped with a viewing mirror 131 and an inspection door 132. The viewing mirror 131 is located above the outer shell 13 to allow operators to observe the operating status of the integrated machine from above. The inspection door 132 is hinged to one side of the outer shell 13 to facilitate operators opening the inspection door 132 to inspect and repair the internal components.

[0025] The filter assembly 2 includes a fan 21 and a plate filter 22. The fan 21 is located on the side of the base 11 near the air inlet and is used to drive the gas flow. Under the action of the fan 21, the exhaust gas continuously enters from the air inlet to achieve circulation. One side of the plate filter 22 faces the fan 21, and the other side of the plate filter 22 is connected to the waste heat recovery assembly 3. The plate filter 22 is used to intercept organic particulate matter in the exhaust gas. After being filtered by the plate filter 22, the exhaust gas enters the waste heat recovery assembly 3.

[0026] The waste heat recovery component 3 includes a waste heat exchanger 31, which can be a counter-flow heat exchanger. The waste heat exchanger 31 has four ports: one port is connected to a plate filter 22, one port is connected to the first cooling component 4, one port is connected to the separation component 6, and the last port serves as the outlet for exhaust. After passing through the waste heat exchanger 31, the exhaust gas sequentially enters the first cooling component 4, the second cooling component 5, and the separation component 6. After passing through the separation component 6, the exhaust gas re-enters the waste heat exchanger 31 to exchange heat with the high-temperature exhaust gas, thus achieving primary cooling and saving energy.

[0027] The first cooling assembly 4 includes a first cooler 41 and a first cooling pipe 42 connected to the first cooler 41. The first cooler 41 is connected to the waste heat exchanger 31. Specifically, the first cooler 41 can be a microchannel cooler. The first cooling pipe 42 transports the cooling medium to the first cooler 41 for circulation. Specifically, the cooling medium can be water. After the exhaust gas enters the microchannel cooler, it undergoes secondary cooling to further reduce the temperature. After passing through the first cooling assembly 4, the exhaust gas enters the second cooling assembly 5.

[0028] Reference Figure 2 , Figure 3 as well as Figure 4 The second cooling assembly 5 includes a second cooler 51, a second cooling pipe 52 connected to the second cooler 51, and a liquid receiving tray 53. The second cooler 51 may specifically be an aluminum pipe surface cooler. The second cooler 51 is connected to the first cooler 41. The second cooling pipe 52 transports the cooling medium to the second cooler 51 for circulation. The cooling medium may specifically be water or an aqueous solution of ethylene glycol. The liquid receiving tray 53 is mounted on the frame 1 and is inclined. The liquid receiving tray 53 is located below the second cooler 51 and is connected to a liquid receiving drain pipe 531, which is connected to the lower side of the liquid receiving tray 53. The liquid receiving tray 53 is equipped with a level gauge 54.

[0029] By configuring a liquid receiving tray 53, a liquid receiving drain pipe 531, and a level gauge 54, the exhaust gas undergoes three stages of cooling after entering the second cooler 51, reducing its temperature to the corresponding process condensation temperature. NMP condenses from the exhaust gas and falls into the liquid receiving tray 53. Due to the inclined design of the liquid receiving tray 53, NMP droplets continuously collect on the lower side of the tray under gravity and are eventually discharged from the liquid receiving drain pipe 531. Simultaneously, the level gauge 54 monitors the liquid volume in the liquid receiving tray 53 in real time, allowing operators to easily observe and determine the collection volume and rate.

[0030] The separation assembly 6 includes a wire mesh demister 61 connected to the second cooler 51 and a separation drain pipe 62 connected to the wire mesh demister 61. The wire mesh demister 61 is connected to a communication port. One side of the wire mesh demister 61 is connected to the second cooler 51 via a pipe, and the other side of the wire mesh demister 61 is connected to the communication port of the waste heat exchanger 31 via a pipe. The wire mesh demister 61 is used to separate the condensed waste gas into gas and liquid. After the waste gas passes through the wire mesh demister 61, the liquid in the waste gas will be separated by the wire mesh demister 61 and finally discharged through the separation drain pipe 62. The separation drain pipe 62 is set to discharge the liquid from the wire mesh demister 61, which can be distinguished from the liquid receiving drain pipe 531, so that the two liquids with different concentrations can be collected separately for subsequent recycling and treatment processes.

[0031] In addition, the recycling machine also includes a detection component 7, which includes several temperature sensors 71 located above the first cooler 41 and the second cooler 51. In this embodiment, there are three temperature sensors 71, which are evenly distributed and extend along the length of the first cooler 41 and the second cooler 51. By setting the temperature sensors 71, the operating temperature of the first cooler 41, the second cooler 51, and the inside of the recycling machine can be effectively monitored, thereby allowing the recycling machine to take corresponding actions based on the temperature.

[0032] The working principle of this refrigerated NMP recovery integrated machine is as follows: High-temperature waste gas at 120 degrees Celsius is discharged from the oven and enters the recovery integrated machine. The high-temperature waste gas enters the filter assembly 2, which filters the organic particulate matter in the high-temperature waste gas. Subsequently, the high-temperature waste gas undergoes gas-to-gas heat exchange with the previously condensed waste gas in the waste heat exchanger 31 to achieve primary cooling, reducing the temperature to 40 degrees Celsius. Then, the waste gas enters the first cooler 41 for secondary cooling, reducing the waste gas temperature to 15 degrees Celsius. The waste gas continues to enter the second cooler 51 for tertiary cooling. Depending on the process and the heat exchange medium, the temperature of the waste gas will be reduced to 0 degrees Celsius or -35 degrees Celsius. During this process, the NMP in the waste gas will condense and fall onto the liquid receiving tray 53 and be discharged through the liquid receiving drain pipe 531. After passing through the second cooler 51, the waste gas enters the wire mesh demister 61 for gas-liquid separation. The liquid in the waste gas will be separated and discharged through the separation drain pipe 62. Finally, the exhaust gas enters the waste heat recovery component 3 to exchange heat with the high-temperature exhaust gas, and the exhaust gas temperature rises back to about 110 degrees Celsius. Some of the exhaust gas is then returned to the coating machine after further heating.

[0033] Exemplary embodiments of this disclosure have been specifically shown and described above. It should be understood that this disclosure is not limited to the detailed structures, arrangements, or implementations described herein; rather, this disclosure is intended to cover various modifications and equivalent arrangements contained within the spirit and scope of the appended claims.

Claims

1. A refrigerated NMP recovery integrated machine, comprising a frame (1), characterized in that, It also includes a filter assembly (2), a waste heat recovery assembly (3), a first cooling assembly (4), a second cooling assembly (5), and a separation assembly (6) arranged on the frame (1) and connected in sequence. The separation assembly (6) is connected to the waste heat recovery assembly (3). The first cooling assembly (4) includes a first cooler (41) and a first cooling pipe (42) connected to the first cooler (41). The second cooling assembly (5) includes a second cooler (51), a second cooling pipe (52) connected to the second cooler (51), and a liquid receiving base (53). The liquid receiving base (53) is arranged on the frame (1) and tilted. The liquid receiving base (53) is connected to a liquid receiving drain pipe (531).

2. The integrated refrigerated NMP recovery machine according to claim 1, characterized in that, The liquid receiving base (53) is located below the second cooler (51), and the liquid receiving drain pipe (531) is connected to the lower side of the liquid receiving base (53); the liquid receiving base (53) is equipped with a liquid level gauge (54).

3. The integrated refrigerated NMP recovery machine according to claim 1, characterized in that, The filter assembly (2) includes a fan (21) and a plate filter (22), one side of the plate filter (22) facing the fan (21) and the other side of the plate filter (22) connected to the waste heat recovery assembly (3).

4. The integrated refrigerated NMP recovery machine according to claim 3, characterized in that, The waste heat recovery component (3) includes a waste heat exchanger (31), which has four ports: one port is connected to the plate filter (22), one port is connected to the first cooler (41), one port is connected to the separation component (6), and one port is used as an outlet for exhaust.

5. A refrigerated NMP recovery integrated machine according to claim 4, characterized in that, The separation assembly (6) includes a wire mesh demister (61) connected to the second cooler (51) and a separation drain pipe (62) connected to the wire mesh demister (61), the wire mesh demister (61) being connected to a communication port.

6. A refrigerated NMP recovery integrated machine according to any one of claims 1-5, characterized in that, It also includes a detection component (7), which includes a plurality of temperature sensors (71) located above the first cooler (41) and the second cooler (51).

7. A refrigerated NMP recovery integrated machine according to any one of claims 1-5, characterized in that, The frame (1) includes a base (11), a support frame (12) disposed on the base (11), and a shell (13) covering the support frame (12); the shell (13) is provided with a viewing mirror (131) and an inspection door (132).

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