Air compressor waste heat utilization system in lithium battery production

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By setting up a heat exchanger in the production of lithium batteries, the waste heat of the air compressor is exchanged with the inlet water of the ultra-pure water system, the problem of difficulty in recycling and utilization of the waste heat of the air compressor in the production of lithium batteries is solved, and the effect of energy saving and consumption reduction and heating efficiency is achieved.

CN222773839UActive Publication Date: 2025-04-18HEFEI GUOXUAN HIGH TECH POWER ENERGY

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Patent Information

Application Number: CN202421531659.5
Authority / Receiving Office: CN · China
Patent Type: Utility models(China)
Current Assignee / Owner
Filing Date: 2024-06-28
Publication Date: 2025-04-18
Estimated Expiration: 2034-06-28

AI Technical Summary

Technical Problem

The low-quality waste heat generated by air compressors in the production of lithium batteries is difficult to recycle, resulting in waste of energy; at the same time, ultra-pure water systems in winter require electrical heating, which is high in cost and uneven heating.

Method used

A waste heat utilization system for air compressors in lithium battery production is designed. By setting up a heat exchanger, the waste heat of the air compressor is heat exchanged with the inlet water of the ultra-pure water system, so as to achieve effective utilization of waste heat and preheating of inlet water.

Benefits of technology

It effectively solves the problems of difficulty in recovering waste heat from air compressors and waste of energy, improves the water production efficiency of ultra-pure water systems, achieves the purpose of energy saving and consumption reduction, and improves the problem of uneven heating.

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Abstract

The utility model relates to an air compressor waste heat utilization system in lithium battery production, which comprises an air compressor, an ultrapure water raw water tank and a heat exchanger, the heat exchanger is provided with a channel I and a channel II which exchange heat with each other, and an inlet of the channel I is communicated with a cooling water outlet of the air compressor. An inlet of the channel II is communicated with a municipal water supply pipeline, and an outlet is communicated with the ultrapure water raw water tank. According to the air compressor waste heat utilization system in lithium battery production, the heat exchanger is arranged, heat generated when the air compressor works is utilized, an original water inlet electric heating mode of an ultrapure water system is replaced, the water inlet temperature of the ultrapure water system is stabilized, and the working efficiency of the system is improved.

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Description

Technical Field

[0001] The utility model relates to the technical field of new energy, and in particular to a system for utilizing waste heat of an air compressor in lithium battery production. Background Art

[0002] Air compressors are important power equipment in the industrial field. In the production process of lithium batteries, air compressors are mainly used to provide continuous and stable high-pressure gas. They play an important role in the processes of diaphragm stacking, surface spraying and cleaning. They are the main energy-consuming equipment in lithium battery manufacturing plants. In addition to improving efficiency, their energy-saving and emission-reduction measures can also consider recycling the waste heat generated by operation. The compression process of air compressors is close to adiabatic compression, and the heat generated cannot be quickly transferred to the environment. About 20% to 50% of the electrical energy is converted into heat, but due to the low quality of the waste heat of air compressors (about 80 to 120°C), it is difficult to recycle. Therefore, most of these low-quality heat energy is currently discharged into the atmosphere in the form of air cooling or water cooling, resulting in huge energy waste.

[0003] At the same time, ultrapure water is needed to supply negative electrode slurry and battery cleaning sections in the production of lithium batteries. The preparation of ultrapure water uses reverse osmosis membrane technology. Generally speaking, the inlet water temperature of the reverse osmosis membrane under working conditions is most suitable at 25°C. For every 1°C decrease in temperature, the viscosity of the water increases, causing the water production rate of the reverse osmosis membrane to decrease by about 2-3%, reducing system efficiency and causing energy waste. Especially in winter, since the inlet water comes from the municipal water supply network and the water temperature is very low, auxiliary electric heating is often required to ensure the normal water production of the ultrapure water system. The cost of electric heating is high and there is uneven heating, so the effect is not good. Utility Model Content

[0004] Based on the current situation that it is difficult to recover and utilize the waste heat of air compressors in lithium battery production, the energy waste is serious, and the ultrapure water system in winter needs to be equipped with auxiliary electric heating, which is costly and has uneven heating, the utility model proposes a waste heat utilization system for air compressors in lithium battery production.

[0005] The utility model proposes a system for utilizing waste heat of air compressors in lithium battery production, which comprises an air compressor, an ultrapure water raw water tank and a heat exchanger. The heat exchanger comprises a channel 1 and a channel 2 for exchanging heat with each other. The inlet of the channel 1 is connected to the cooling water outlet of the air compressor, the inlet of the channel 2 is connected to the municipal water supply pipeline and its outlet is connected to the ultrapure water raw water tank.

[0006] The utility model discloses a system for utilizing waste heat from air compressors in lithium battery production, which solves the problem that low-quality heat generated by traditional air compressor units is difficult to recover and is directly discharged into the atmosphere, causing energy waste, by providing a heat exchanger. On the other hand, it realizes preheating of the inlet water of the ultrapure water system, which changes the situation that the traditional electric heating method takes a long time and has uneven heating, thereby improving the system's ultrapure water production efficiency and achieving the goal of energy saving and consumption reduction.

[0007] As a further improvement of the above solution of the utility model, the air compressor waste heat utilization system in lithium battery production also includes a cooling tower, and the outlet of channel 1 is connected to the inlet of the cooling tower through a pipeline.

[0008] As a further improvement of the above-mentioned scheme of the utility model, the air compressor waste heat utilization system in the lithium battery production also includes a softening water tank, the outlet of the cooling tower is connected to the inlet of the softening water tank through a pipeline, the outlet of the softening water tank is connected to the cooling water inlet of the air compressor through a pipeline, and a cooling water pump is arranged on the connecting pipeline between the softening water tank and the air compressor.

[0009] As a further improvement of the above solution of the utility model, the cooling water pump adopts a horizontal centrifugal pump.

[0010] As a further improvement of the above solution of the utility model, the heat exchanger adopts a plate heat exchanger.

[0011] As a further improvement of the above scheme of the utility model, the air compressor waste heat utilization system in lithium battery production also includes a condensate pipe, one end of which is connected to the condensate outlet of the heat exchanger and the other end of which is connected to the ultrapure water raw water tank.

[0012] As a further improvement of the above-mentioned scheme of the utility model, the air compressor waste heat utilization system in the lithium battery production also includes a tap water inlet pipe 1, one end of the tap water inlet pipe 1 is connected to the inlet of the channel 2 and the other end is connected to the municipal water supply pipeline, and a regulating valve is arranged on the tap water inlet pipe 1.

[0013] As a further improvement of the above scheme of the utility model, the air compressor waste heat utilization system in the lithium battery production also includes a tap water inlet pipe 2, one end of the tap water inlet pipe 2 is connected to the regulating valve and the other end is connected to the ultrapure water raw water tank.

[0014] As a further improvement of the above scheme of the utility model, the air compressor waste heat utilization system in lithium battery production also includes an ultrapure water supply pipe, one end of which is connected to the ultrapure water raw water tank, and a water inlet pump is provided on the ultrapure water supply pipe.

[0015] As a further improvement of the above solution of the utility model, a temperature sensor located upstream of the water inlet pump is arranged on the ultrapure water supply pipe, and the temperature sensor and the regulating valve are both connected to a temperature controller.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] 1. The waste heat utilization system of air compressors in lithium battery production of the utility model, by setting up a heat exchanger, utilizes the excess heat generated by the air compressor during operation, replaces the original electric heating method of the ultrapure water system, stabilizes the water inlet temperature, and improves the working efficiency of the system. It solves the problem that the low-quality heat generated by the traditional air compressor unit is difficult to recover and is directly discharged into the atmosphere, causing energy waste; on the other hand, it realizes the preheating of the water inlet of the ultrapure water system, changes the situation that the traditional electric heating method takes a long time and the heating is uneven, and can improve the system's ultrapure water production efficiency and achieve the purpose of energy saving and consumption reduction.

[0018] 2. The air compressor waste heat utilization system in lithium battery production of the utility model can control the opening and closing degree of the regulating valve by setting a temperature sensor and a regulating valve, stabilize the water inlet temperature of the ultrapure water system, avoid the water temperature in the water supply pipe being affected by changes in external conditions, and keep the working capacity of the ultrapure water system in a high efficiency range.

[0019] 3. The air compressor waste heat utilization system provided by the utility model has a simple structure and is easy to maintain and use on a daily basis. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a structural schematic diagram of a system for utilizing waste heat from air compressors in lithium battery production, as proposed in an embodiment of the utility model.

[0021] Figure numerals: 1. air compressor; 2. ultrapure water raw water tank; 3. heat exchanger; 4. cooling tower; 5. softening water tank; 6. cooling water pump; 7. tap water inlet pipe 1; 8. regulating valve; 9. tap water inlet pipe 2; 10. condensate water pipe; 11. ultrapure water supply pipe; 12. water inlet pump; 13. temperature sensor. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] In view of the current situation that it is difficult to recycle the waste heat of air compressors in lithium battery production, the energy waste is serious, and the ultrapure water system in winter needs to be equipped with an auxiliary electric heating water source, which is costly and has uneven heating, this embodiment provides a system for utilizing the waste heat of air compressors in lithium battery production.

[0024] Reference Figure 1 The air compressor waste heat utilization system in the lithium battery production of this embodiment includes an air compressor 1, an ultrapure water raw water tank 2 and a heat exchanger 3, and may also include a cooling tower 4, a softening water tank 5, a tap water inlet pipe 1 7, a tap water inlet pipe 2 9, a condensing water pipe 10 and an ultrapure water supply pipe 11.

[0025] Air compressor 1 is mainly used to provide continuous and stable high-pressure gas in the production process of lithium batteries. It plays an important role in processes such as diaphragm stacking, surface spraying and cleaning, and is the main energy-consuming equipment in lithium battery manufacturing plants.

[0026] The ultrapure water raw water tank 2 is used for storing water and serves as a water source for the ultrapure water system.

[0027] The heat exchanger 3 is used for heat exchange, and has a channel 1 and a channel 2 for heat exchange with each other, and also has a condensed water outlet. The inlet of channel 1 is connected to the cooling water outlet of the air compressor 1 through a pipeline, and the hot water at the cooling water outlet of the air compressor 1 is introduced into channel 1. The outlet of channel 1 is connected to the water inlet of the cooling tower 4 through a pipeline, and the outlet of the cooling tower 4 is connected to the water inlet of the softening water tank 5 through a pipeline. The outlet of the softening water tank 5 is connected to the cooling water inlet of the air compressor 1 through a pipeline, and a cooling water pump 6 is provided on the connecting pipeline between the softening water tank 5 and the air compressor 1. The outlet of channel 2 is connected to the ultrapure water raw water tank 2 through a pipeline.

[0028] In this embodiment, the heat exchanger 3 adopts a plate heat exchanger 3, which uses a high-efficiency aluminum heat exchange material, and the outer shell is a stainless steel shell. Multiple plate heat exchangers 3 can be set up to form a whole. The cooling tower 4 is a closed cooling tower 4, made of stainless steel, frequency conversion control, and the specifications and dimensions must match the amount of water exchanged. Multiple units can be set up to form a whole. The cooling water pump 6 uses a horizontal centrifugal pump, frequency conversion control, and the material is stainless steel for the flow parts. A spare pump group should be set, and the water flow rate in the pipeline should be set at about 1.2m / s.

[0029] One end of the tap water inlet pipe 7 is connected to the water inlet of channel 2 and the other end is connected to the municipal water supply pipeline. A regulating valve 8 is provided on the tap water inlet pipe 7.

[0030] One end of the tap water inlet pipe 9 is connected to the regulating valve 8 and the other end thereof is connected to the ultrapure water raw water tank 2.

[0031] One end of the condensate pipe 10 is connected to the condensate outlet of the heat exchanger 3 and the other end is connected to the ultrapure water raw water tank 2. The condensate pipe 10 may be provided with corresponding gate valves, vent valves, etc. After the condensate in the heat exchanger 3 is collected by the ultrapure water raw water tank 2, it can continue to enter the ultrapure water system for processing and utilization, thereby reducing the amount of tap water used and reducing costs.

[0032] The water outlet of the ultrapure water raw water tank 2 is connected to the ultrapure water supply pipe 11, and the ultrapure water supply pipe 11 is provided with a water inlet pump 12 and a temperature sensor 13. When the water inlet pump 12 is started, the water in the ultrapure water raw water tank 2 can be delivered to the ultrapure water system, and the inlet water temperature supplied to the ultrapure water system is detected in real time by the temperature sensor 13. The temperature sensor 13 and the regulating valve 8 are both connected to a temperature controller.

[0033] Through the above structural arrangement, when the room temperature is high (such as in summer), the regulating valve 8 is adjusted, and the municipal water supply directly enters the ultrapure water raw water tank 2 through the tap water inlet pipe 2 9, and the water inlet pump 12 is started to supply water to the ultrapure water system; when the room temperature is low (such as in winter), the municipal water supply enters the channel 2 through the tap water inlet pipe 1 7 and enters the ultrapure water raw water tank 2 through the tap water inlet pipe 2 9, and the cooling water heated by the air compressor 1 enters the channel 1 and performs heat exchange with the tap water in the channel 2, so that the temperature of the water entering the ultrapure water raw water tank 2 is increased, and the temperature of the temperature sensor 13 is set to 25°C. The temperature controller adjusts the opening and closing degree of the regulating valve 8 according to the temperature of the water in the ultrapure water supply pipe 11 detected by the temperature sensor 13, and adjusts the water flow allocated to the tap water inlet pipe 1 7 and the tap water inlet pipe 2 9 to ensure that the water temperature before entering the inlet pump 12 is around 25°C, and there is no need to perform additional electrical heating on the raw water. At the same time, the cooling water cooled by the heat exchanger 3 enters the cooling tower 4 and the softened water tank 5 in turn, which can reduce the power consumption of the cooling fan of the cooling tower 4, save energy and extend the service life. Finally, the softened water with a lower temperature enters the air compressor 1 to absorb the heat generated when the air compressor 1 is working.

[0034] In the air compressor waste heat utilization system in the lithium battery production of this embodiment, the heat exchange efficiency of the heat exchanger 3 is above 60%, the temperature of the cooling water after heating in the air compressor 1 is above 50°C, and the tap water can fully exchange heat with the high-temperature cooling water in the plate heat exchanger 3 before entering the ultrapure water raw water tank 2. The water temperature of the pipeline before the water inlet pump 12 is controlled at about 25°C, and there is no need for additional electrical heating of the raw water.

[0035] It should be noted that, in this embodiment, pressure gauges, pressure transmitters, flow meters, butterfly valves, etc. can be installed on each pipeline according to actual conditions for easy use. The temperature controller adjusts the opening and closing degree of the regulating valve 8 according to the temperature of the water in the ultrapure water supply pipe 11 detected by the temperature sensor 13, which is a known technology and will not be described in detail here.

[0036] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0037] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A system for utilizing waste heat from an air compressor in lithium battery production, comprising an air compressor (1), characterized in that: It also includes an ultrapure water raw water tank (2) and a heat exchanger (3), the heat exchanger (3) having a channel 1 and a channel 2 for exchanging heat with each other, the inlet of the channel 1 being connected to the cooling water outlet of the air compressor (1), the inlet of the channel 2 being connected to the municipal water supply pipeline and the outlet thereof being connected to the ultrapure water raw water tank (2).

2. The air compressor waste heat utilization system in lithium battery production according to claim 1 is characterized in that: The air compressor waste heat utilization system in lithium battery production also includes a cooling tower (4), and the outlet of channel 1 is connected to the inlet of the cooling tower (4) through a pipeline.

3. The air compressor waste heat utilization system in lithium battery production according to claim 2 is characterized in that: The air compressor waste heat utilization system in lithium battery production also includes a softened water tank (5), the outlet of the cooling tower (4) is connected to the inlet of the softened water tank (5) through a pipeline, the outlet of the softened water tank (5) is connected to the cooling water inlet of the air compressor (1) through a pipeline, and a cooling water pump (6) is provided on the connecting pipeline between the softened water tank (5) and the air compressor (1).

4. The system for utilizing waste heat from air compressors in lithium battery production according to claim 3, characterized in that: The cooling water pump (6) is a horizontal centrifugal pump.

5. The air compressor waste heat utilization system in lithium battery production according to claim 1 is characterized in that: The heat exchanger (3) is a plate-type heat exchanger (3).

6. The air compressor waste heat utilization system in lithium battery production according to claim 1 is characterized in that: The air compressor waste heat utilization system in lithium battery production also includes a condensation water pipe (10), one end of which is connected to the condensation water outlet of the heat exchanger (3) and the other end of which is connected to the ultrapure water raw water tank (2).

7. The system for utilizing waste heat from air compressors in lithium battery production according to claim 1, characterized in that: The air compressor waste heat utilization system in the lithium battery production also includes a tap water inlet pipe (7), one end of which is connected to the inlet of the channel 2 and the other end of which is connected to the municipal water supply pipeline. A regulating valve (8) is arranged on the tap water inlet pipe (7).

8. The system for utilizing waste heat from air compressors in lithium battery production according to claim 7, characterized in that: The air compressor waste heat utilization system in lithium battery production also includes a second tap water inlet pipe (9), one end of which is connected to the regulating valve (8) and the other end of which is connected to the ultrapure water raw water tank (2).

9. The system for utilizing waste heat from air compressors in lithium battery production according to claim 8, characterized in that: The air compressor waste heat utilization system in lithium battery production also includes an ultrapure water supply pipe (11), one end of which is connected to the ultrapure water raw water tank (2), and a water inlet pump (12) is arranged on the ultrapure water supply pipe (11).

10. The system for utilizing waste heat from air compressors in lithium battery production according to claim 9, characterized in that: The ultrapure water supply pipe (11) is provided with a temperature sensor (13) located upstream of the water inlet pump (12), and the temperature sensor (13) and the regulating valve (8) are both connected to a temperature controller.