A zero-vapor system for the lithium battery manufacturing industry

Abstract

The utility model discloses a lithium battery manufacturing industry zero steam system, including first waste heat recovery module, second waste heat recovery module, third waste heat recovery module, first -class central energy station, first waste heat recovery module, first -class central energy station all are connected with 75 DEG C heat preservation water tank water inlet end, and 75 DEG C heat preservation water tank water outlet end is connected with first hot -water heat exchanger, second hot -water heat exchanger respectively, and first hot -water heat exchanger, second hot -water heat exchanger all are connected with 65 DEG C heat preservation water tank water inlet end, and 65 DEG C heat preservation water tank water outlet end is connected with plate heat exchanger, second waste heat recovery module, third waste heat recovery module respectively through a plurality of water outlet branch pipes, and plate heat exchanger hot -side water outlet is connected first waste heat recovery module, and second waste heat recovery module, third waste heat recovery module all are connected with plate heat exchanger cold -side water inlet, and plate heat exchanger cold -side water outlet is connected with 55 DEG C heat preservation water tank, and 55 DEG C heat preservation water tank water outlet is connected first -class central energy station. The utility model discloses can reduce carbon emission.

Description

Technical Field

[0001] This utility model relates to the field of low-grade waste heat recovery technology, specifically a zero-steam system for the lithium battery manufacturing industry. Background Technology

[0002] The manufacturing process of lithium batteries requires specific temperature and humidity control, and high-temperature air conditioners and dehumidifiers are two commonly used devices. Currently, both high-temperature air conditioners and dehumidifiers on the market use steam and electric heating methods to achieve the purpose of heating or dehumidification. Regardless of the method used, the energy cost is very high.

[0003] Meanwhile, the manufacturing process of lithium batteries requires the use of equipment such as steam boilers, thermal oil boilers, air compressors, and refrigeration units. The exhaust gas temperature of the thermal oil boiler, even after passing through a primary energy-saving device, is still around 130℃. The cooling water for the air compressors and refrigeration units needs to be cooled by cooling towers to achieve circulating cooling of these units. This not only wastes a significant amount of waste heat, but also requires the cooling towers to consume a large amount of electricity and water. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this invention provides a zero-steam system for the lithium battery manufacturing industry. This system extracts waste heat from the high-temperature flue gas of the thermal oil boiler in the lithium battery plant, as well as from the waste heat of the air compressor and refrigeration unit's cooling circulating water. After improving the heat grade, the waste heat is supplied to the dehumidifier's downstream heating section, the dehumidifier's regeneration section, and the high-temperature air conditioning unit, thereby achieving low-grade waste heat recovery and zero-steam energy supply for the entire plant.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A zero-steam system for the lithium battery manufacturing industry includes: a first waste heat recovery module for recovering waste heat from a primary air compressor, a second waste heat recovery module for recovering waste heat from a secondary air compressor, a third waste heat recovery module for recovering waste heat from the flue gas of a thermal oil boiler, a primary central energy station for improving the heat quality of hot water, a first hot water heat exchanger installed in the downstream section of a dehumidifier, a second hot water heat exchanger installed in a high-temperature air conditioner, a 75°C insulated water tank, a 55°C insulated water tank, a 65°C insulated water tank, and a plate heat exchanger. The outlets of the first waste heat recovery module and the primary central energy station are both connected to the inlet of the 75℃ insulated water tank. The outlet of the 75℃ insulated water tank is connected to the inlet of the first hot water heat exchanger and the second hot water heat exchanger, respectively. The outlets of the first hot water heat exchanger and the second hot water heat exchanger are both connected to the inlet of the 65℃ insulated water tank. The outlet of the 65℃ insulated water tank is connected to the hot-side inlet of the plate heat exchanger, the return water end of the second waste heat recovery module, and the return water end of the third waste heat recovery module through multiple outlet branch pipes. The hot-side outlet of the plate heat exchanger is connected to the return water end of the first waste heat recovery module. The outlets of the second and third waste heat recovery modules are both connected to the cold-side inlet of the plate heat exchanger. The cold-side outlet of the plate heat exchanger is connected to the inlet of the 55℃ insulated water tank. The outlet of the 55℃ insulated water tank is connected to the inlet of the primary central energy station.

[0006] Furthermore, it also includes a cooling water circulation pipeline, with the outlet pipe of the cooling water circulation pipeline connected to the primary central energy station and the return pipe of the cooling water circulation pipeline connected to the outlet of the 65°C insulated water tank.

[0007] Furthermore, it also includes a fourth waste heat recovery module for recovering waste heat from the film production workshop. The outlet of the fourth waste heat recovery module is connected to the primary central energy station, and the return water of the fourth waste heat recovery module is connected to the outlet of the 65°C insulated water tank.

[0008] Furthermore, it also includes a dormitory heating module, with the inlet end of the dormitory heating module connected to a 75℃ insulated water tank and the outlet end of the dormitory heating module connected to a 65℃ insulated water tank.

[0009] Furthermore, it also includes a workshop heating module, with the inlet end of the workshop heating module connected to a 75℃ insulated water tank and the outlet end of the workshop heating module connected to a 65℃ insulated water tank.

[0010] Furthermore, it also includes a secondary central energy station for improving the heat quality of hot water, a 120℃ insulated water tank, and a third hot water heat exchanger installed in the regeneration section of the dehumidifier. The inlet of the secondary central energy station is connected to a 75℃ insulated water tank, the outlet of the secondary central energy station is connected to a 120℃ insulated water tank, the inlet of the third hot water heat exchanger is connected to a 120℃ insulated water tank, and the outlet of the third hot water heat exchanger is connected to a 65℃ insulated water tank.

[0011] Furthermore, it also includes a backup heat source plate heat exchanger, a hot water boiler circulation pipeline, a 75°C insulated water tank connected to the cold side outlet of the backup heat source plate heat exchanger, a 65°C insulated water tank connected to the cold side inlet of the backup heat source plate heat exchanger, and a hot side inlet and outlet connected to the outlet and return pipes of the hot water boiler circulation pipeline, respectively.

[0012] Furthermore, each outlet branch pipe of the 65℃ insulated water tank is equipped with a circulation pump set. The circulation pump set consists of two separate pump sets connected in parallel to form a one-in-one-standby structure. Each pump set includes two first butterfly valves, a water pump, a filter, and two reducers. The two reducers are located at both ends of the water pump and between the two first butterfly valves. The filter is located between the first butterfly valve and the reducer before the water pump.

[0013] Furthermore, electric valve assemblies are installed at the inlet ends of the first, second, and third hot water heat exchangers, and static balancing valves are installed at the outlet ends of the first, second, and third hot water heat exchangers.

[0014] Furthermore, the electric valve assembly includes three second butterfly valves, an electric valve, a main pipe, and a bypass pipe. The two ends of the bypass pipe are connected to the main pipe. The electric valve and two of the second butterfly valves are installed on the main pipe, and one second butterfly valve is installed on the bypass pipe.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows: This utility model can recover low-grade waste heat from lithium battery plants through waste heat recovery technology, and can also supply energy to energy-consuming equipment, achieving zero steam consumption throughout the plant, reducing the use of natural gas, and reducing carbon emissions. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a zero-steam system for the lithium battery manufacturing industry according to this utility model; Figure 2 This is a schematic diagram of the circulating pump unit in this utility model; Figure 3 This is a schematic diagram of the electric valve assembly in this utility model; In the diagram: 1-First waste heat recovery module, 2-Second waste heat recovery module, 3-Third waste heat recovery module, 4-55℃ insulated water tank, 5-Plate heat exchanger, 6-First-level central energy station, 7-Cooling circulating water pipeline, 8-Fourth waste heat recovery module, 9-Circulating pump set, 10-75℃ insulated water tank, 11-65℃ insulated water tank, 12-Second-level central energy station, 13-120℃ insulated water tank, 14-Electric valve assembly, 15-Static balancing valve, 18-Dormitory heating module, 19-Workshop heating module, 16-Dehumidifier afterheating section, 17-First hot water heat exchanger, 20-High temperature air conditioner, 21-Second hot water heat exchanger, 22-Dehumidifier regeneration section, 23-Regeneration hot water heat exchanger, 24-Hot water boiler circulation pipeline, 25-Backup heat source plate heat exchanger, 26-First butterfly valve, 27-Filter, 28-Reducing pipe, 29-Bypass pipe. Detailed Implementation

[0017] To more clearly illustrate the technical solution and effects of this utility model, the present utility model will be clearly and completely described below with reference to the accompanying drawings and embodiments. It should be understood that the embodiments described herein are merely some embodiments of this utility model, not all embodiments, and the technical features involved in the various embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0018] It should be noted that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature marked "first" or "second" may explicitly or implicitly include one or more of that feature. Unless otherwise expressly specified and limited, the terms "installed," "connected," "linked," and "set up" should be interpreted broadly. For example, they may refer to a fixed connection or setting, a detachable connection or setting, or an integral connection or setting; they may refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components.

[0019] Please see Figure 1 This embodiment provides a zero-steam system for the lithium battery manufacturing industry, including: a first waste heat recovery module 1 for recovering waste heat from a primary air compressor, a second waste heat recovery module 2 for recovering waste heat from a secondary air compressor, a third waste heat recovery module 3 for recovering waste heat from the flue gas of a thermal oil boiler, a primary central energy station 6 for improving the heat quality of hot water, a first hot water heat exchanger 17 installed in the post-dehumidifier heat exchange section 16, a second hot water heat exchanger 21 installed in a high-temperature air conditioner 20, a 75℃ insulated water tank 10, a 55℃ insulated water tank 4, a 65℃ insulated water tank 11, and a plate heat exchanger 5; the outlets of the first waste heat recovery module 1 and the primary central energy station 6 are both connected to the inlet of the 75℃ insulated water tank 10, and the outlet of the 75℃ insulated water tank 10 is respectively connected to... The inlet ends of the first hot water heat exchanger 17 and the second hot water heat exchanger 21 are connected. The outlet ends of the first hot water heat exchanger 17 and the second hot water heat exchanger 21 are both connected to the inlet end of the 65℃ insulated water tank 11. The outlet end of the 65℃ insulated water tank 11 is connected to the hot side inlet of the plate heat exchanger 5, the return end of the second waste heat recovery module 2, and the return end of the third waste heat recovery module 3 through multiple outlet branch pipes. The hot side outlet of the plate heat exchanger 5 is connected to the return end of the first waste heat recovery module 1. The outlet ends of the second waste heat recovery module 2 and the third waste heat recovery module 3 are both connected to the cold side inlet of the plate heat exchanger 5. The cold side outlet of the plate heat exchanger 5 is connected to the inlet of the 55℃ insulated water tank 4. The outlet of the 55℃ insulated water tank 4 is connected to the inlet end of the primary central energy station 6.

[0020] In this embodiment, the waste heat from the flue gas of the primary air compressor, secondary air compressor, and thermal oil boiler in the lithium battery plant is recovered through the first waste heat recovery module 1, the second waste heat recovery module 2, and the third waste heat recovery module 3, respectively. The primary central energy station 6 includes a heat pump, which can be any one of the following: compression heat pump, absorption heat pump, ejector heat pump, or mechanical supercharging MVR.

[0021] Optionally, it also includes a cooling water circulation pipeline 7, the outlet of which is connected to the primary central energy station 6, and the return pipe of which is connected to the outlet of the 65°C insulated water tank 11. By connecting the cooling water circulation pipeline 7 to the primary central energy station 6, waste heat in the cooling water circulation pipeline 7 within the lithium battery plant can be recovered and its heat quality improved.

[0022] Optionally, it also includes a fourth waste heat recovery module 8 for recovering waste heat in the wafer fabrication workshop. The outlet of the fourth waste heat recovery module 8 is connected to the primary central energy station 6, and the return water of the fourth waste heat recovery module 8 is connected to the outlet of the 65°C insulated water tank 11. Waste heat in the lithium battery plant workshop is recovered through the fourth waste heat recovery module 8.

[0023] Optionally, the system also includes a dormitory heating module 18, with its inlet connected to a 75°C insulated water tank 10 and its outlet connected to a 65°C insulated water tank 11. The dormitory is heated via the dormitory heating module 18.

[0024] Optionally, the system also includes a workshop heating module 19, with its inlet connected to a 75°C insulated water tank 10 and its outlet connected to a 65°C insulated water tank 11. The workshop is heated through the workshop heating module 19.

[0025] Optionally, it also includes a secondary central energy station 12 for improving the hot water quality, a 120°C insulated water tank 13, and a third hot water heat exchanger installed in the dehumidifier regeneration section 22. The inlet of the secondary central energy station 12 is connected to the 75°C insulated water tank 10, the outlet of the secondary central energy station 12 is connected to the 120°C insulated water tank 13, the inlet of the third hot water heat exchanger is connected to the 120°C insulated water tank 13, and the outlet of the third hot water heat exchanger is connected to the 65°C insulated water tank 11.

[0026] Optionally, the system also includes a backup heat source plate heat exchanger 255 and a hot water boiler circulation pipeline 24. The cold-side outlet of the backup heat source plate heat exchanger 255 is connected to a 75°C insulated water tank 10, and the cold-side inlet of the backup heat source plate heat exchanger 255 is connected to a 65°C insulated water tank 11. The hot-side inlet and outlet of the backup heat source plate heat exchanger 255 are respectively connected to the outlet and return water pipes of the hot water boiler circulation pipeline 24. Using a hot water boiler as a backup heat source, when the factory restarts, the hot water boiler provides heat to supply 75°C hot water for system startup. When the system is under maintenance, the hot water boiler can also be used as a backup heat source to ensure continuous system operation.

[0027] Optionally, each outlet branch pipe of the 65℃ insulated water tank 11 is equipped with a circulation pump group 9. The circulation pump group 9 consists of two separate pump groups connected in parallel to form a one-in-one-outstand structure. Each pump group includes two first butterfly valves 26, a water pump, a filter 27, and two reducers 28. The two reducers 28 are located at both ends of the water pump and are located between the two first butterfly valves 26. The filter 27 is located between the first butterfly valve 26 and the reducer 28 before the water pump.

[0028] Optionally, an electric valve assembly 14 is installed at the inlet end of the first hot water heat exchanger 17, the second hot water heat exchanger 21, and the third hot water heat exchanger, and a static balancing valve 15 is installed at the outlet end of the first hot water heat exchanger 17, the second hot water heat exchanger 21, and the third hot water heat exchanger.

[0029] Specifically, the electric valve assembly 14 includes three second butterfly valves, an electric valve, a main pipe, and a bypass pipe 29. The two ends of the bypass pipe 29 are connected to the main pipe. The electric valve and two of the second butterfly valves are installed on the main pipe, and one second butterfly valve is installed on the bypass pipe 29.

[0030] In this embodiment, the first waste heat recovery module 1, the second waste heat recovery module 2, the third waste heat recovery module 3, and the fourth waste heat recovery module 8 can be heat exchangers, such as tubular heat exchangers or shell-and-tube heat exchangers.

[0031] The working principle of this utility model is as follows: The first waste heat recovery module 1 and the second waste heat recovery module 2 exchange heat with the high-temperature compressed air from the series-connected primary and secondary air compressors, respectively, with outlet water temperatures of 75℃ and 50℃. The third waste heat recovery module 3 exchanges heat with the high-temperature flue gas from the thermal oil boiler, with an outlet water temperature of 50℃. The 75℃ hot water in the 75℃ insulated water tank 10 can supply the dehumidifier's downstream heating section 16 and the high-temperature air conditioner 20. Its return water temperature is 65℃ and it is stored in the 65℃ insulated water tank 11. The 65℃ return water from the first waste heat recovery module 1 exchanges heat with the 50℃ supply water from the second waste heat recovery module 2 and the third waste heat recovery module 3 through a plate heat exchanger 5. After the heat exchange, the return water temperature of the first waste heat recovery module 1 decreases to 62℃, while the supply water temperature of the second waste heat recovery module 2 and the third waste heat recovery module 3 increases to 55℃. The purpose of heat exchange between the two modules is to lower the return water temperature of the first waste heat recovery module 1 and recover more heat. The water supplied by the second waste heat recovery module 2 and the third waste heat recovery module 3 is upgraded to 75°C by the primary central energy station 6 and then sent to the 75°C insulated water tank 10. The high-temperature air in the interlayer of the film production workshop is recovered by the fourth waste heat recovery module 8 and then upgraded to 75°C insulated water tank 10 by the primary central energy station 6. The cooling water supply temperature in the cooling circulating water pipeline 7 is 37°C, and it is upgraded by the primary central energy station 6 before being sent to the 75°C insulated water tank 10. The 75°C hot water is supplied by the circulating pump group 9 to the dehumidifier's heat exchange section 16, the high-temperature air conditioner 20, and for heating the dormitories and workshops in winter. In addition, 75℃ hot water serves as the waste heat source for the secondary central energy station 12. After being upgraded by the secondary central energy station 12, it supplies 120℃ hot water to the 120℃ insulated water tank 13. The 120℃ hot water is used for preheating in the regeneration section 22 of the dehumidifier, and its return water temperature is 105℃. Electric valve groups 14 are installed on the inlet branch pipes of the dehumidifier's post-heating section 16, the regeneration section, and the high-temperature air conditioner 20 to adjust the flow rate as needed according to the actual load requirements. Based on the on-site distribution of dehumidifiers, they are grouped according to proximity, and a static balancing valve 15 is installed on the return water pipe of each group of dehumidifiers to regulate the flow rate and pressure in the supply and return water pipes.

[0032] The backup heat source for the entire system is a hot water boiler. When the factory restarts, the hot water boiler provides heat and supplies 75°C hot water for system startup. During system maintenance, the hot water boiler can also be used as a backup heat source to ensure continuous system operation.

[0033] The above description is a preferred embodiment of the present utility model, used to explain the technical solution of the present utility model, and is not intended to limit the present utility model. Those skilled in the art can make conventional modifications, equivalent substitutions and improvements within the spirit and principles of the present utility model, all of which are still included within the protection scope of the present utility model.

Claims

1. A zero-steam system for the lithium battery manufacturing industry, characterized in that, include: A first waste heat recovery module for recovering waste heat from a primary air compressor, a second waste heat recovery module for recovering waste heat from a secondary air compressor, a third waste heat recovery module for recovering waste heat from the flue gas of a thermal oil boiler, a primary central energy station for improving the heat quality of hot water, a first hot water heat exchanger installed in the downstream section of a dehumidifier, a second hot water heat exchanger installed in a high-temperature air conditioner, a 75℃ insulated water tank, a 55℃ insulated water tank, a 65℃ insulated water tank, and a plate heat exchanger. The outlets of the first waste heat recovery module and the primary central energy station are both connected to the inlet of the 75℃ insulated water tank. The outlet of the 75℃ insulated water tank is connected to the inlet of the first hot water heat exchanger and the second hot water heat exchanger, respectively. The outlets of the first hot water heat exchanger and the second hot water heat exchanger are both connected to the inlet of the 65℃ insulated water tank. The outlet of the 65℃ insulated water tank is connected to the hot-side inlet of the plate heat exchanger, the return water end of the second waste heat recovery module, and the return water end of the third waste heat recovery module through multiple outlet branch pipes. The hot-side outlet of the plate heat exchanger is connected to the return water end of the first waste heat recovery module. The outlets of the second and third waste heat recovery modules are both connected to the cold-side inlet of the plate heat exchanger. The cold-side outlet of the plate heat exchanger is connected to the inlet of the 55℃ insulated water tank. The outlet of the 55℃ insulated water tank is connected to the inlet of the primary central energy station.

2. The zero-steam system for the lithium battery manufacturing industry according to claim 1, characterized in that: It also includes a cooling water circulation pipeline, the outlet of which is connected to the primary central energy station, and the return pipe of which is connected to the outlet of the 65°C insulated water tank.

3. The zero-steam system for the lithium battery manufacturing industry according to claim 1, characterized in that: It also includes a fourth waste heat recovery module for recovering waste heat from the film production workshop. The outlet of the fourth waste heat recovery module is connected to the primary central energy station, and the return water of the fourth waste heat recovery module is connected to the outlet of the 65℃ insulated water tank.

4. A zero-steam system for the lithium battery manufacturing industry according to claim 1, characterized in that: It also includes a dormitory heating module, with the inlet end of the dormitory heating module connected to a 75℃ insulated water tank and the outlet end of the dormitory heating module connected to a 65℃ insulated water tank.

5. A zero-steam system for the lithium battery manufacturing industry according to claim 1, characterized in that: It also includes a workshop heating module, with the inlet end of the workshop heating module connected to a 75℃ insulated water tank and the outlet end of the workshop heating module connected to a 65℃ insulated water tank.

6. A zero-steam system for the lithium battery manufacturing industry according to claim 1, characterized in that: It also includes a secondary central energy station for improving the heat quality of hot water, a 120℃ insulated water tank, and a third hot water heat exchanger installed in the regeneration section of the dehumidifier. The inlet of the secondary central energy station is connected to the 75℃ insulated water tank, the outlet of the secondary central energy station is connected to the 120℃ insulated water tank, the inlet of the third hot water heat exchanger is connected to the 120℃ insulated water tank, and the outlet of the third hot water heat exchanger is connected to the 65℃ insulated water tank.

7. A zero-steam system for the lithium battery manufacturing industry according to claim 1, characterized in that: It also includes a backup heat source plate heat exchanger and a hot water boiler circulation pipeline. The cold side outlet of the backup heat source plate heat exchanger is connected to a 75°C insulated water tank, the cold side inlet of the backup heat source plate heat exchanger is connected to a 65°C insulated water tank, and the hot side inlet and outlet of the backup heat source plate heat exchanger are respectively connected to the outlet pipe and return pipe of the hot water boiler circulation pipeline.

8. A zero-steam system for the lithium battery manufacturing industry according to claim 1, characterized in that: Each outlet branch pipe of the 65℃ insulated water tank is equipped with a circulation pump set. The circulation pump set consists of two separate pump sets connected in parallel to form a one-in-one-standby structure. Each pump set includes two first butterfly valves, a water pump, a filter, and two reducers. The two reducers are located at both ends of the water pump and between the two first butterfly valves. The filter is located between the first butterfly valve and the reducer before the water pump.

9. A zero-steam system for the lithium battery manufacturing industry according to claim 6, characterized in that: Electric valve assemblies are installed at the inlet ends of the first, second, and third hot water heat exchangers, and static balancing valves are installed at the outlet ends of the first, second, and third hot water heat exchangers.

10. A zero-steam system for the lithium battery manufacturing industry according to claim 9, characterized in that: The electric valve assembly includes three second butterfly valves, an electric valve, a main pipe, and a bypass pipe. The two ends of the bypass pipe are connected to the main pipe. The electric valve and two of the second butterfly valves are installed on the main pipe, and one second butterfly valve is installed on the bypass pipe.

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