阅读说明：本技术 涂布机溶剂回收水综合利用系统及其方法 (Comprehensive utilization system and method for solvent recovery water of coating machine ) 是由 陈浩 黄相博 仇健荣 于 2021-05-26 设计创作，主要内容包括：一种涂布机溶剂回收水综合利用系统,包括涂布机、散热冷凝装置、水冷循环供水罐、水储罐、供水单元、第二吸收塔及冷却塔；涂布机与散热冷凝装置的一侧连接,散热冷凝装置的另一侧与涂布机连接；散热冷凝装置中设置有冷凝管,冷凝管的一端与水冷循环供水罐的出水口连接,另一端与水冷循环供水罐的回收口连接；散热冷凝装置的底部与水储罐的顶部连接；水储罐的底部分别与第二吸收塔及冷却塔连接,水储罐的顶部与供水单元连接。本发明还提供一种涂布机溶剂回收水综合利用方法。如此对涂布机排放出的气体及冷凝后的水进行回收利用、减少资源浪费且生产环境稳定、提高生产效率及产品品质。(A comprehensive utilization system for solvent recovery water of a coating machine comprises the coating machine, a heat dissipation and condensation device, a water-cooling circulating water supply tank, a water storage tank, a water supply unit, a second absorption tower and a cooling tower; the coating machine is connected with one side of the heat dissipation condensing device, and the other side of the heat dissipation condensing device is connected with the coating machine; a condensing pipe is arranged in the heat dissipation condensing device, one end of the condensing pipe is connected with a water outlet of the water cooling circulation water supply tank, and the other end of the condensing pipe is connected with a recovery port of the water cooling circulation water supply tank; the bottom of the heat dissipation condensing device is connected with the top of the water storage tank; the bottom of the water storage tank is respectively connected with the second absorption tower and the cooling tower, and the top of the water storage tank is connected with the water supply unit. The invention also provides a comprehensive utilization method of the solvent recovered water of the coating machine. Therefore, the gas discharged by the coating machine and the condensed water are recycled, the resource waste is reduced, the production environment is stable, and the production efficiency and the product quality are improved.)

1. The utility model provides a coating machine solvent recovery water comprehensive utilization system which characterized in that: the device comprises a coating machine, a heat dissipation condensing device, a water-cooling circulating water supply tank, a water storage tank, a water supply unit, a second absorption tower and a cooling tower; the coating machine is connected with one side of the heat dissipation and condensation device through a first air pipe and a blower arranged on the first air pipe, and the other side of the heat dissipation and condensation device is connected with the coating machine through a second air pipe; a condenser pipe is arranged in the heat dissipation condensing device, one end of the condenser pipe is connected with a water outlet of the water-cooling circulation water supply tank through a water pipe, and the other end of the condenser pipe is connected with a recovery port of the water-cooling circulation water supply tank through a water pipe; a first water pump is arranged on a water pipe between the heat dissipation condensing device and the water-cooling circulating water supply tank; the bottom of the heat dissipation condensing device is connected with the top of the water storage tank through a water pipe, and a second water pump is arranged on the water pipe between the heat dissipation condensing device and the water storage tank; the bottom of the water storage tank is connected with the second absorption tower and the cooling tower through two water pipes respectively, the top of the water storage tank is further connected with the water supply unit through a water pipe, and a fifth water pump is arranged on the water pipe between the water storage tank and the water supply unit.

2. The system of claim 1, wherein the system comprises: and a third water pump is arranged on the water pipe between the water storage tank and the second absorption tower.

3. The system of claim 1, wherein the system comprises: and a fourth water pump is arranged on the water pipe between the water storage tank and the cooling tower.

4. The system of claim 1, wherein the system comprises: the first absorption tower is connected with the bottom of the heat dissipation and condensation device through a water pipe and is connected with the top of the water storage tank through a water pipe; and a sixth water pump is arranged on a water pipe between the first absorption tower and the heat dissipation condensing device, and a seventh water pump is arranged on a water pipe between the first absorption tower and the water storage tank.

5. The system of claim 4, wherein the system comprises: a first liquid level sensor is arranged in the water storage tank, and a controller is connected with the first liquid level sensor, the seventh water pump, the fifth water pump, the second water pump and the sixth water pump.

6. The system of claim 5, wherein the system comprises: when the first liquid level sensor senses that the liquid level in the water storage tank is lower than a first height value, the controller controls the seventh water pump to work so as to supply water in the first absorption tower to the water storage tank; when the first liquid level sensor senses that the liquid level in the water storage tank is lower than the second height value, the second height value is smaller than the first height value, and the controller controls the fifth water pump to work so as to supply liquid water of an external water source to the water storage tank.

7. The system of claim 6, wherein the system comprises: when the first liquid level sensor senses that the liquid level in the water storage tank reaches a third height value, the third height value is larger than the first height value, and the controller controls the sixth water pump to work, so that the first absorption tower receives liquid water of the heat dissipation and condensation device.

8. The system of claim 5, wherein the system comprises: the first absorption tower is also connected with a water-cooling circulating water supply tank through a water pipe, and an eighth water pump is arranged on the water pipe between the first absorption tower and the water-cooling circulating water supply tank; a second liquid level sensor is arranged in the water-cooling circulating water supply tank, and the controller is further connected with the second liquid level sensor and the eighth water pump.

9. The system of claim 8, wherein the system comprises: when the second liquid level sensor senses that the liquid level in the water-cooling circulating water supply tank is lower than a fourth height value, the controller controls the eighth water pump to work, so that the liquid in the first absorption tower is supplemented to the water-cooling circulating water supply tank; when the second liquid level sensor senses that the liquid level in the water-cooling circulating water supply tank reaches a fifth height value, the fifth height value is larger than the fourth height value, and the eighth water pump is controlled by the controller to stop working.

10. A comprehensive utilization method of solvent-recovered water of a coating machine, which utilizes the comprehensive utilization system of solvent-recovered water of a coating machine as claimed in any one of claims 1 to 9 to recover gas and water, characterized in that: the method comprises the following steps:

step S1: cooling the gas discharged from the coating machine by a heat dissipation and condensation device, condensing the water vapor in the gas discharged from the coating machine into liquid water, and simultaneously cooling the solvent in the gas discharged from the coating machine into liquid and dissolving the liquid water;

step S2: recycling the cooled gas to the coating machine;

step S3: temporarily storing liquid water dissolved with a solvent by a water storage tank;

step S4: further absorbing the solvent by a second absorption tower; further cooling the liquid water by a cooling tower;

step S5: receiving liquid water through a first absorption tower when a liquid level in the water storage tank approaches a capacity of the water storage tank;

step S6: when the liquid level in the water storage tank is lower than the first height value, supplying the liquid water in the first absorption tower to the water storage tank;

step S7: and when the liquid level in the water storage tank is lower than the second height value, the second height value is smaller than the first height value, and the liquid water of the external water source is supplied to the water storage tank.

Technical Field

The invention relates to the technical field of lithium battery manufacturing, in particular to a system and a method for comprehensively utilizing solvent recovered water of a coating machine.

Background

The coating machine is a device for uniformly coating the lithium battery slurry containing the solvent on the current collector, uniformly coats the slurry with good stability, viscosity and fluidity on the positive and negative current collectors, and dries the organic solvent in the slurry. The coating of the slurry has important significance on the capacity, consistency, safety and the like of the lithium battery, and statistics shows that the percentage of battery failure caused by the slurry coating process of the pole piece accounts for more than 10% of all causes of the lithium battery failure.

N-methyl pyrrolidone, NMP for short, is widely used in the production of lithium ion batteries due to good chemical stability, high flash point and excellent dilution performance, is a main component in waste gas discharged by a coating machine in the production of lithium ion batteries, and can cause a large amount of consumption of NMP solvent and volatile organic pollution if not recovered. The existing solvent recovery system of the coating machine directly discharges the gas containing the solvent discharged by the coating machine after being cooled and condensed by a heat exchanger, and the gas is not recovered and utilized, so that the resource waste is caused; the coating machine directly gets new trend from external environment, and temperature, humidity are unstable, cause the production environment control of coating machine unstable, influence production efficiency and product quality. In addition, the solvent recovery system of the coating machine needs a large amount of water, and the water is completely supplied by an external water source, so that the water resource consumption is high.

Disclosure of Invention

In view of the above, the present invention provides a system and a method for comprehensively utilizing solvent-recovered water of a coating machine, which can recycle gas discharged from the coating machine and condensed water, reduce resource waste, stabilize production environment, and improve production efficiency and product quality, so as to solve the above problems.

A comprehensive utilization system for solvent recovery water of a coating machine comprises the coating machine, a heat dissipation and condensation device, a water-cooling circulating water supply tank, a water storage tank, a water supply unit, a second absorption tower and a cooling tower; the coating machine is connected with one side of the heat dissipation and condensation device through a first air pipe and a blower arranged on the first air pipe, and the other side of the heat dissipation and condensation device is connected with the coating machine through a second air pipe; a condenser pipe is arranged in the heat dissipation condensing device, one end of the condenser pipe is connected with a water outlet of the water-cooling circulation water supply tank through a water pipe, and the other end of the condenser pipe is connected with a recovery port of the water-cooling circulation water supply tank through a water pipe; a first water pump is arranged on a water pipe between the heat dissipation condensing device and the water-cooling circulating water supply tank; the bottom of the heat dissipation condensing device is connected with the top of the water storage tank through a water pipe, and a second water pump is arranged on the water pipe between the heat dissipation condensing device and the water storage tank; the bottom of the water storage tank is connected with the second absorption tower and the cooling tower through two water pipes respectively, the top of the water storage tank is further connected with the water supply unit through a water pipe, and a fifth water pump is arranged on the water pipe between the water storage tank and the water supply unit.

Further, a third water pump is arranged on a water pipe between the water storage tank and the second absorption tower.

Furthermore, a fourth water pump is arranged on a water pipe between the water storage tank and the cooling tower.

The first absorption tower is connected with the bottom of the heat dissipation and condensation device through a water pipe and is connected with the top of the water storage tank through a water pipe; and a sixth water pump is arranged on a water pipe between the first absorption tower and the heat dissipation condensing device, and a seventh water pump is arranged on a water pipe between the first absorption tower and the water storage tank.

Furthermore, a first liquid level sensor is arranged in the water storage tank, and a controller is connected with the first liquid level sensor, the seventh water pump, the fifth water pump, the second water pump and the sixth water pump.

Further, when the first liquid level sensor senses that the liquid level in the water storage tank is lower than the first height value, the controller controls the seventh water pump to work so as to supply water in the first absorption tower to the water storage tank; when the first liquid level sensor senses that the liquid level in the water storage tank is lower than the second height value, the second height value is smaller than the first height value, and the controller controls the fifth water pump to work so as to supply liquid water of an external water source to the water storage tank.

Further, when the first liquid level sensor senses that the liquid level in the water storage tank reaches a third height value, the third height value is larger than the first height value, and the controller controls the sixth water pump to work, so that the first absorption tower receives liquid water of the heat dissipation and condensation device.

Furthermore, the first absorption tower is also connected with a water-cooling circulating water supply tank through a water pipe, and an eighth water pump is arranged on the water pipe between the first absorption tower and the water-cooling circulating water supply tank; a second liquid level sensor is arranged in the water-cooling circulating water supply tank, and the controller is further connected with the second liquid level sensor and the eighth water pump.

Further, when the second liquid level sensor senses that the liquid level in the water-cooling circulating water supply tank is lower than a fourth height value, the controller controls the eighth water pump to work, so that the liquid in the first absorption tower is supplemented to the water-cooling circulating water supply tank; when the second liquid level sensor senses that the liquid level in the water-cooling circulating water supply tank reaches a fifth height value, the fifth height value is larger than the fourth height value, and the eighth water pump is controlled by the controller to stop working.

The comprehensive utilization method of the solvent recovery water of the coating machine utilizes the comprehensive utilization system of the solvent recovery water of the coating machine to recover gas and water, and comprises the following steps: step S1: cooling the gas discharged from the coating machine by a heat dissipation and condensation device, condensing the water vapor in the gas discharged from the coating machine into liquid water, and simultaneously cooling the solvent in the gas discharged from the coating machine into liquid and dissolving the liquid water; step S2: recycling the cooled gas to the coating machine; step S3: temporarily storing liquid water dissolved with a solvent by a water storage tank; step S4: further absorbing the solvent by a second absorption tower; further cooling the liquid water by a cooling tower; step S5: receiving liquid water through a first absorption tower when a liquid level in the water storage tank approaches a capacity of the water storage tank; step S6: when the liquid level in the water storage tank is lower than the first height value, supplying the liquid water in the first absorption tower to the water storage tank; step S7: and when the liquid level in the water storage tank is lower than the second height value, the second height value is smaller than the first height value, and the liquid water of the external water source is supplied to the water storage tank.

Compared with the prior art, the comprehensive utilization system for the solvent recovery water of the coating machine comprises the coating machine, a heat dissipation and condensation device, a water-cooling circulating water supply tank, a water storage tank, a water supply unit, a second absorption tower and a cooling tower; the coating machine is connected with one side of the heat dissipation and condensation device through a first air pipe and a blower arranged on the first air pipe, and the other side of the heat dissipation and condensation device is connected with the coating machine through a second air pipe; a condenser pipe is arranged in the heat dissipation condensing device, one end of the condenser pipe is connected with a water outlet of the water-cooling circulation water supply tank through a water pipe, and the other end of the condenser pipe is connected with a recovery port of the water-cooling circulation water supply tank through a water pipe; a first water pump is arranged on a water pipe between the heat dissipation condensing device and the water-cooling circulating water supply tank; the bottom of the heat dissipation condensing device is connected with the top of the water storage tank through a water pipe, and a second water pump is arranged on the water pipe between the heat dissipation condensing device and the water storage tank; the bottom of the water storage tank is connected with the second absorption tower and the cooling tower through two water pipes respectively, the top of the water storage tank is further connected with the water supply unit through a water pipe, and a fifth water pump is arranged on the water pipe between the water storage tank and the water supply unit. The invention also provides a comprehensive utilization method of the solvent recovered water of the coating machine. Therefore, the gas discharged by the coating machine and the condensed water are recycled, the resource waste is reduced, the production environment is stable, and the production efficiency and the product quality are improved.

Drawings

Embodiments of the invention are described below with reference to the accompanying drawings, in which:

fig. 1 is a schematic diagram of a comprehensive utilization system for recovering water from a solvent of a coating machine provided by the invention.

Detailed Description

Specific embodiments of the present invention will be described in further detail below based on the drawings. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.

Referring to fig. 1, the system for comprehensively utilizing solvent-recovered water of a coating machine according to the present invention includes a coating machine 10, a heat-dissipating and condensing device 20, a water-cooling circulating water supply tank 30, a water storage tank 40, a first absorption tower 50, a water supply unit 60, a second absorption tower 110, a cooling tower 120, and a plurality of water pumps.

The coating machine 10 is connected to one side of the heat-dissipating and condensing device 20 through a first air duct 11 and a blower disposed on the first air duct 11, and the other side of the heat-dissipating and condensing device 20 is connected to the coating machine 10 through a second air duct 12.

The heat-dissipating condensing unit 20 is provided therein with a condenser pipe, one end of which is connected to a water outlet of the water-cooling circulation water supply tank 30 through a water pipe, and the other end of which is connected to a recovery port of the water-cooling circulation water supply tank 30 through a water pipe.

A first water pump M1 is provided on a water pipe between the heat radiating condensation device 20 and the water-cooled circulation water supply tank 30.

The heat dissipation condensing device 20 is used for cooling the gas discharged from the coating machine 10, and the water vapor in the gas discharged from the coating machine 10 is condensed into liquid water; the solvent, such as N-methylpyrrolidone, in the gas discharged from the coater 10 is cooled to liquid and dissolved in liquid water.

The bottom of the heat-dissipating condensation device 20 is connected with the top of the water storage tank 40 through a water pipe, and a second water pump M2 is arranged on the water pipe between the heat-dissipating condensation device 20 and the water storage tank 40. The condensed liquid water containing the solvent is stored in the water storage tank 40.

The bottom of the water storage tank 40 is connected to the second absorption tower 110 and the cooling tower 120 through two water pipes, respectively.

A third water pump M3 is provided on the water pipe between the water storage tank 40 and the second absorption tower 110. The second absorption tower 110 serves to further sufficiently absorb the solvent.

A fourth water pump M4 is provided on the water pipe between the water storage tank 40 and the cooling tower 120. The cooling tower 120 is used to further cool the condensed liquid water.

The top of the water storage tank 40 is also connected to the water supply unit 60 through a water pipe, and a fifth water pump M5 is provided on the water pipe between the water storage tank 40 and the water supply unit 60. The water supply unit 60 is used to supply liquid water of an external water source.

The first absorption tower 50 is connected to the bottom of the heat-radiating condensation device 20 through a water pipe, and is connected to the top of the water storage tank 40 through a water pipe. A sixth water pump M6 is provided on the water pipe between the first absorption tower 50 and the heat-dissipating condensation device 20, and a seventh water pump M7 is provided on the water pipe between the first absorption tower 50 and the water storage tank 40. The first absorption tower 50 serves to store liquid water.

A first liquid level sensor 71 is arranged in the water storage tank 40, and a controller is connected with the first liquid level sensor 71, the seventh water pump M7, the fifth water pump M5, the second water pump M2 and the sixth water pump M6.

When the first liquid level sensor 71 senses that the liquid level in the water storage tank 40 is lower than the first height value a, the controller controls the seventh water pump M7 to operate to supply the liquid water in the first absorption tower 50 to the water storage tank 40; when the first liquid level sensor 71 senses that the liquid level in the water storage tank 40 is lower than the second height value B, which is smaller than the first height value a, the controller controls the fifth water pump M5 to operate to supply liquid water of the external water source to the water storage tank 40.

When the liquid level in the water storage tank 40 reaches the second height value B, the controller controls the fifth water pump M5 to stop working; when the liquid level in the water storage tank 40 reaches the first height value a, the controller controls the seventh water pump M7 to stop working.

When the first liquid level sensor 71 senses that the liquid level in the water storage tank 40 reaches the third height value C, which is greater than the first height value a and is close to the top of the water storage tank 40 (indicating that the liquid level is close to the capacity of the water storage tank 40), the controller controls the second water pump M2 to stop working and controls the sixth water pump M6 to work, so that the first absorption tower 50 receives the liquid water of the heat-dissipating condensation device 20.

Further, the first absorption tower 50 is connected to the water-cooled circulating water supply tank 30 through a water pipe, and an eighth water pump M8 is provided on the water pipe between the first absorption tower 50 and the water-cooled circulating water supply tank 30.

A second liquid level sensor 72 is arranged in the water-cooling circulating water supply tank 30, and the controller is also connected with the second liquid level sensor 72 and the eighth water pump M8.

There may be a loss or the like of the liquid water in the water-cooled circulation water supply tank 30. When the second liquid level sensor 72 senses that the liquid level in the water cooling circulation water supply tank 30 is lower than the fourth height value D, the controller controls the eighth water pump M8 to be operated, thereby replenishing the liquid state in the first absorption tower 50 to the water cooling circulation water supply tank 30. When the second liquid level sensor 72 senses that the liquid level in the water-cooled circulating water supply tank 30 reaches the fifth height value E, the fifth height value E is greater than the fourth height value D, and the controller controls the eighth water pump M8 to stop working.

Thus, the gas discharged from the coater 10 is effectively recycled, the water vapor and the solvent in the gas are recycled, the waste of resources is reduced, and the continuous and sufficient supply of liquid water is ensured when the solvent is recycled.

The invention also provides a comprehensive utilization method of the solvent recovered water of the coating machine, which comprises the following steps:

step S1: the gas discharged from the coater 10 is cooled by the heat-dissipating condensing device 20, so that the water vapor in the gas discharged from the coater 10 is condensed into liquid water, and the solvent, such as N-methylpyrrolidone, in the gas discharged from the coater 10 is cooled into liquid and dissolved in the liquid water.

Step S2: the cooled gas is recovered to the coater 10.

Step S3: the liquid water in which the solvent is dissolved is temporarily stored by the water storage tank 40.

Step S4: further absorbing the solvent by the second absorption tower 110; the liquid water is further cooled by the cooling tower 120.

Step S5: liquid water is received by the first absorption tower 50 when the liquid level in the water storage tank 40 approaches the capacity of the water storage tank 40.

Step S6: when the liquid level in the water storage tank 40 is lower than the first height value a, the liquid water in the first absorption tower 50 is supplied to the water storage tank 40.

Step S7: when the liquid level in the water storage tank 40 is lower than the second height value B, which is smaller than the first height value a, liquid water of the external water source is supplied to the water storage tank 40.

The single double-layer coating machine with the width of 700mm and the speed of 60m/min needs about 20 tons of liquid water in the slurry every day, and the liquid water can be recovered every day according to the solvent recovery efficiency of 90 percent: 20 ton × 90% ═ 18 ton; 5400 tons of liquid water can be saved by 300 days in one year.

Compared with the prior art, the comprehensive utilization system for solvent recovery water of the coating machine comprises the coating machine 10, a heat dissipation condensing device 20, a water-cooling circulating water supply tank 30, a water storage tank 40, a water supply unit 60, a second absorption tower 110 and a cooling tower 120; the coating machine 10 is connected with one side of the heat dissipation and condensation device 20 through a first air duct 11 and a blower arranged on the first air duct 11, and the other side of the heat dissipation and condensation device 20 is connected with the coating machine 10 through a second air duct 12; a condenser pipe is arranged in the heat dissipation condensing device 20, one end of the condenser pipe is connected with a water outlet of the water-cooling circulation water supply tank 30 through a water pipe, and the other end of the condenser pipe is connected with a recovery port of the water-cooling circulation water supply tank 30 through a water pipe; a first water pump M1 is arranged on a water pipe between the heat-radiating condensing device 20 and the water-cooling circulating water supply tank 30; the bottom of the heat-dissipation condensing device 20 is connected with the top of the water storage tank 40 through a water pipe, and a second water pump M2 is arranged on the water pipe between the heat-dissipation condensing device 20 and the water storage tank 40; the bottom of the water storage tank 40 is connected to the second absorption tower 110 and the cooling tower 120 through two water pipes, the top of the water storage tank 40 is further connected to the water supply unit 60 through one water pipe, and a fifth water pump M5 is disposed on the water pipe between the water storage tank 40 and the water supply unit 60. The invention also provides a comprehensive utilization method of the solvent recovered water of the coating machine. Therefore, the gas discharged by the coating machine and the condensed water are recycled, the resource waste is reduced, the production environment is stable, and the production efficiency and the product quality are improved.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, and any modifications, equivalents or improvements that are within the spirit of the present invention are intended to be covered by the following claims.