Lithium battery plant waste heat gas circulation heat recovery device

Abstract

The utility model relates to the technical field of waste gas heat circulation, in particular to a lithium battery plant waste heat gas circulation heat recovery device which comprises a circulation pipeline, a preheating device and a temperature adjusting device. A first-stage heat source cavity is formed in the preheating device, and a first-stage heat source air inlet channel and a first-stage heat source exhaust channel which communicate with the first-stage heat source cavity are formed in the two sides of the preheating device correspondingly. The temperature adjusting device comprises a second-stage heat source cavity and a temperature adjusting cavity wrapping the second-stage heat source cavity in an airtight isolation mode. Primary waste heat gas is secondarily guided into a secondary heat source cavity through a primary heat source gas guide pipe, and the temperature of the secondary heat source cavity is maintained at a constant temperature in cooperation with cold and heat compensation of a temperature adjusting cavity, so that gradient utilization of high-temperature preheating and low-temperature temperature adjusting of the waste heat gas is realized, and the heating energy consumption of cleaning liquid is reduced; and through linkage control of the temperature adjusting cavity, the external cold air pipe and the external air pipe and in combination with real-time feedback of the temperature sensor, temperature fluctuation of the cleaning liquid is accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of waste gas heat circulation technology, specifically to a waste heat gas circulation heat recovery device for lithium battery factories. Background Technology

[0002] In the lithium-ion battery production process, the high-temperature waste heat gas emitted from the process equipment at 120-180℃ contains considerable thermal energy resources. Especially in critical processes such as electrode coating and drying, the direct emission of large amounts of waste heat gas not only wastes energy but also creates a significant energy mismatch with the constant-temperature heating requirements of the cleaning section. While existing heat recovery technologies attempt to utilize waste heat gas to preheat the cleaning fluid, a mismatch in thermodynamic properties remains. The temperature fluctuation range of the cleaning fluid (typically a 60-80℃ organic solvent system) needs to be controlled within ±1.5℃; excessive temperature fluctuations will affect lithium battery performance. However, the waste heat gas is affected by fluctuations in the production process, exhibiting periodic temperature fluctuations of 20-40℃. Direct heat exchange can easily lead to overshooting in the cleaning fluid, affecting the efficiency of removing residues from the electrode surface and the uniformity of separator wetting. Utility Model Content

[0003] I. Technical problems to be solved

[0004] The purpose of this invention is to provide a waste heat recovery device for lithium battery factory, which can recover and utilize high-temperature waste heat and precisely control the temperature of cleaning fluid.

[0005] II. Technical Solution

[0006] This utility model is achieved through the following technical solution:

[0007] This utility model proposes a waste heat recovery device for lithium battery factory, including a circulation pipeline, a preheating device, and a temperature regulating device. The preheating device is a closed cylindrical structure, with a primary heat source cavity inside and primary heat source air inlet and exhaust channels on both sides respectively. The temperature regulating device includes a secondary heat source cavity and a temperature regulating cavity that is airtightly wrapped around the secondary heat source cavity. The circulation pipeline passes through the primary heat source cavity and the secondary heat source cavity in sequence, and the temperature regulating cavity is connected to normal temperature air or an external cold source.

[0008] Furthermore, the temperature regulating device includes an outer wall and an inner wall fixed inside the outer wall, a secondary heat source cavity is formed inside the inner wall, and a temperature regulating cavity is formed between the outer wall and the inner wall.

[0009] Furthermore, the outer wall is provided with an external cold air pipe, an external air pipe, and a temperature-controlled exhaust pipe that are connected to the temperature-controlled cavity.

[0010] Furthermore, the outer wall is provided with a secondary heat source inlet pipe and a secondary heat source exhaust pipe that pass through the temperature regulating cavity and connect to the secondary heat source cavity.

[0011] Furthermore, a primary heat source air guide pipe is bypassed to the primary heat source exhaust channel, and the primary heat source air guide pipe is connected to the secondary heat source air inlet pipe.

[0012] Furthermore, a temperature sensor is fixed on the inner wall.

[0013] Furthermore, the circulation pipes are provided in a number of densely and equally spaced arrangement.

[0014] Furthermore, the length of the temperature regulating device is at least twice that of the preheating device.

[0015] Furthermore, the volume of the temperature-regulating cavity is at least three times the volume of the secondary heat source cavity.

[0016] Furthermore, a partition is connected between the outer wall and the inner wall, and the partition is located between the external air pipe and the temperature-controlled exhaust pipe, so that the gas forms a unidirectional gas flow channel around the inner wall in the temperature-controlled cavity.

[0017] III. Beneficial Effects

[0018] Compared with the prior art, this utility model has the following advantages:

[0019] This invention features a two-stage heat exchange structure for the circulation pipeline, consisting of a primary heat source chamber and a secondary heat source chamber. The primary heat source gas is then introduced into the secondary heat source chamber via a primary heat source gas pipe. Combined with temperature compensation from the temperature control chamber, the secondary heat source chamber is maintained at a constant temperature. This achieves tiered utilization of the waste heat gas through high-temperature preheating and low-temperature temperature control, reducing the energy consumption for heating the cleaning fluid. Furthermore, the linkage control between the temperature control chamber and the external cold air pipe and external air pipe, along with real-time feedback from a temperature sensor, precisely controls the temperature fluctuations of the cleaning fluid. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural schematic diagram of the present invention;

[0021] Figure 2 This is a three-dimensional structural diagram of a partially cut-out temperature control device;

[0022] Figure 3 This is a three-dimensional structural diagram of a partially cut-out preheating device;

[0023] 1. Circulation pipe; 2. Preheating device; 21. Primary heat source chamber; 22. Primary heat source air inlet channel; 23. Primary heat source exhaust channel; 24. Primary heat source air guide pipe; 3. Temperature control device; 3a. Outer wall; 3b. Inner wall; 3c. Baffle; 31. Secondary heat source chamber; 32. Temperature control chamber; 33. External cold air pipe; 34. External air pipe; 35. Temperature control exhaust pipe; 36. Secondary heat source air inlet pipe; 37. Secondary heat source exhaust pipe; 4. Temperature sensor. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] Please refer to the following: A waste heat gas circulation and heat recovery device for lithium battery factories. Figure 1-3 It includes a circulation pipe 1, a preheating device 2, and a temperature regulating device 3. The circulation pipe 1 forms the main circulation channel of the cleaning fluid. The preheating device 2 uses waste heat to preheat the cleaning fluid to a certain temperature. The temperature regulating device 3 regulates the temperature of the cleaning fluid in the preheated circulation pipe 1. The length of the temperature regulating device 3 is at least twice that of the preheating device 2, effectively controlling the preheating time and the temperature regulating time.

[0026] The preheating device 2 is a closed cylindrical structure. Inside the preheating device 2, there is a primary heat source cavity 21, and primary heat source air inlet channel 22 and primary heat source exhaust channel 23 connected to the primary heat source cavity 21 are respectively provided on both sides. The primary heat source air inlet channel 22 and primary heat source exhaust channel 23 are respectively connected to pipes to control the flow of high temperature waste heat gas into and out of the primary heat source cavity 21.

[0027] The temperature control device 3 includes a secondary heat source cavity 31 and a temperature control cavity 32 that is airtightly enclosed outside the secondary heat source cavity 31. The temperature control cavity 32 is connected to ambient temperature air or an external cold source. Specifically, the temperature control device 3 includes an outer wall 3a and an inner wall 3b fixed inside the outer wall. The secondary heat source cavity 31 is formed within the inner wall 3b, and the temperature control cavity 32 is formed between the outer wall 3a and the inner wall 3b. The volume of the temperature control cavity 32 is at least three times the volume of the secondary heat source cavity 31, ensuring that the temperature control cavity 32 can quickly regulate the temperature inside the secondary heat source cavity 31. An external cold air pipe 33, an external air pipe 34, and a temperature control exhaust pipe 35 are provided on the outer wall 3a, which are connected to the temperature control cavity 32. A secondary heat source inlet pipe 36 and a secondary heat source exhaust pipe 37 are provided on the outer wall 3a, which pass through the temperature control cavity 32 and are connected to the secondary heat source cavity 31.

[0028] The circulation pipe 1 passes sequentially through the primary heat source chamber 21 and the secondary heat source chamber 31. Several circulation pipes 1 are arranged densely and at equal intervals. In the primary heat source chamber 21, the cleaning fluid in the circulation pipe 1 is heated to a certain temperature by high-temperature waste heat gas. In the temperature control device 3, the temperature control chamber 32 controls the connection or closure with the ambient temperature air pipe or external cold source, thereby raising or lowering the temperature of the gas in the secondary heat source chamber 31, thus controlling the secondary heat source chamber 31 to remain constant within a certain temperature threshold range. The circulation pipe 1 passes through the secondary heat source chamber 31, thus keeping the cleaning fluid in the circulation pipe 1 constant at the operating temperature.

[0029] In this embodiment, a temperature sensor 4 is fixed on the inner wall 3b. The computer receives the signal transmitted by the temperature sensor 4 and controls the opening of the solenoid valves connected to the external cold air pipe 33, the external air pipe 34, and the temperature-regulating exhaust pipe 35, thereby controlling the internal temperature of the temperature-regulating chamber 32. Specifically, if the temperature inside the secondary heat source chamber 31 is too high, the external air pipe 34 is opened to introduce pressurized air into the temperature-regulating chamber; if the cooling rate is too slow, the valve of the external cold air pipe 33 is opened to quickly reduce the temperature inside the temperature-regulating chamber 32, thereby cooling the secondary heat source chamber 31; if the temperature inside the secondary heat source chamber 31 is too low, the valves connected to the external cold air pipe 33, the external air pipe 34, and the temperature-regulating exhaust pipe 35 are closed or their openings are reduced, and the valve opening of the secondary heat source inlet pipe 36 is increased to raise the temperature inside the secondary heat source chamber 31.

[0030] As one embodiment of this utility model, a primary heat source air guide pipe 24 is bypassed to the primary heat source exhaust channel 23. The primary heat source air guide pipe 24 is connected to the secondary heat source air inlet pipe 36, which introduces part of the high-temperature waste heat gas in the primary heat source chamber 21 into the secondary heat source chamber 31. The temperature of the secondary heat source chamber 31 is controlled by the temperature regulating chamber 32 to ensure that the secondary heat source chamber 31 is in a constant low-temperature state of 60-80℃, thereby realizing the secondary gradient utilization of high-temperature waste heat gas to regulate the temperature of the cleaning fluid.

[0031] In addition, a partition 3c is connected between the outer wall 3a and the inner wall 3b. The partition 3c is located between the external air pipe 34 and the temperature-controlled exhaust pipe 35, so that the gas forms a unidirectional gas flow channel around the inner wall 3b in the temperature-controlled cavity 32, thereby increasing the contact time between the gas and the inner wall 3b.

[0032] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Various modifications and improvements made to the technical solutions of the present invention by those skilled in the art without departing from the design concept of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the claims.

Claims

1. A lithium battery plant waste heat gas circulation heat recovery device, comprising a circulation pipeline, a preheating device and a temperature regulating device, characterized in that, The preheating device is a closed cylinder structure, and the preheating device has a primary heat source cavity inside, and a primary heat source air inlet channel and a primary heat source air outlet channel are arranged on the two sides of the primary heat source cavity respectively and communicate with the primary heat source cavity; The temperature adjusting device comprises a secondary heat source cavity and a temperature adjusting cavity which is wrapped outside the secondary heat source cavity in airtight and insulated manner, the circulating pipeline passes through the primary heat source cavity and the secondary heat source cavity in sequence, and the temperature adjusting cavity is connected with normal temperature air or an external cold source interface.

2. The lithium battery plant waste heat gas circulation heat recovery device according to claim 1, characterized in that, The temperature adjusting device comprises an outer wall and an inner wall fixed inside the outer wall, the secondary heat source cavity is formed in the inner wall, and the temperature adjusting cavity is formed between the outer wall and the inner wall.

3. The lithium battery plant waste heat gas circulation heat recovery device according to claim 2, characterized in that, The outer wall is provided with an external cold air pipe, an external air pipe and a temperature adjusting air outlet pipe which are connected to the temperature adjusting cavity.

4. The lithium battery plant waste heat gas circulation heat recovery device according to claim 3, characterized in that, The outer wall is provided with a secondary heat source air inlet pipe and a secondary heat source air outlet pipe which pass through the temperature adjusting cavity and are connected to the secondary heat source cavity.

5. The lithium battery plant waste heat gas circulation heat recovery device according to claim 4, characterized in that, The primary heat source air outlet channel is bypass connected with a primary heat source air guide pipe, and the primary heat source air guide pipe communicates with the secondary heat source air inlet pipe.

6. The lithium battery plant waste heat gas circulation heat recovery device according to claim 2, characterized in that, The inner wall is fixed with a temperature sensor.

7. The lithium battery plant waste heat gas circulation heat recovery device according to claim 1, characterized in that, The circulating pipeline is provided with a plurality of pipelines which are arranged in dense and equal intervals.

8. The lithium battery plant waste heat gas circulation heat recovery device according to claim 1, characterized in that, The length of the temperature adjusting device is at least 2 times of the length of the preheating device.

9. The lithium battery plant waste heat gas circulation heat recovery device according to claim 1, characterized in that, The volume of the temperature adjusting cavity is at least 3 times of the volume of the secondary heat source cavity.

10. The lithium battery plant waste heat gas circulation heat recovery device according to claim 3, characterized in that, A partition plate is connected between the outer wall and the inner wall, and the partition plate is located between the external air pipe and the temperature adjusting air outlet pipe, so that the gas forms a one-way gas flow channel which surrounds the inner wall in the temperature adjusting cavity.

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