Waste heat recycling system in electrolytic bath production process
By designing a waste heat recovery system for electrolytic cells, the problem of heat loss from electrolytic cells and flue gas was solved, enabling heat recovery and utilization, improving the operating environment and saving energy.
Patent Information
- Application Number
- CN202423041758.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-10
- Publication Date
- 2025-10-28
- Estimated Expiration
- 2034-12-10
AI Technical Summary
During the production of electrolytic lithium ingots, heat loss from the electrolytic cell and flue gas leads to energy waste and environmental heat radiation, affecting the comfort of operators.
Design a waste heat recovery system, including an electrolytic cell shell, an inner tank, and a flue gas heat exchange device, which are connected to a circulating water pool, a plate heat exchanger, and a water storage tank through pipelines to recover and utilize the heat from the electrolytic cell shell, inner tank, and flue gas for heating, domestic water supply, and workshop equipment heating.
It effectively recovers and utilizes the heat from the electrolytic cell and flue gas, reduces energy waste, improves the operating environment, saves energy, and provides heat for heating and domestic water supply.
Smart Images
Figure CN223484925U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of chemical production technology, and in particular relates to a waste heat recovery system in the electrolytic cell production process. Background Art
[0002] The workshop produces electrolytic lithium ingots, using graphite electrodes as anodes. When energized, the electrolyte within the electrolytic cell moves in a specific direction under the influence of the cathode and anode, generating a significant amount of heat. This results in substantial heat radiation emanating from the outer shell of the electrolytic cell. During electrolysis, 30% of the energy is lost to the surrounding environment as heat, causing significant energy waste and environmental heat radiation. Furthermore, the exhaust gas from the workshop's external ducts also contains a large amount of heat. All this heat radiation within the workshop causes an overall increase in ambient temperature, leading to discomfort for the operators on site. Utility Model Content
[0003] The purpose of this invention is to provide a waste heat recovery system for the electrolytic cell production process, so as to solve the technical problems mentioned in the background art.
[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0005] A waste heat recovery system for electrolytic cell production includes: an electrolytic cell shell heat exchange device, an electrolytic cell inner tank heat exchange device, a plate heat exchanger, a circulating water pool, a flue gas heat exchange device, and a water storage tank.
[0006] The inlet of the electrolytic cell shell heat exchange device is connected to the circulating water tank via a pipeline, and the outlet is connected to the inlet of the plate heat exchanger via a pipeline. The outlet of the plate heat exchanger is connected to the circulating water tank, and the inlet and outlet of the plate heat exchanger are connected to the heating inlet pipe and the heating return pipe, respectively. A branch pipe is provided on the pipeline, which is used to supply heat to the workshop equipment.
[0007] The first pipeline is provided with a second branch pipe and a third branch pipe. The second branch pipe is connected to the inlet of the heat exchange device of the inner tank of the electrolytic cell, and the outlet of the heat exchange device of the inner tank of the electrolytic cell is connected to the second pipeline through the third pipeline.
[0008] The third branch pipe is connected to the second inlet of the flue gas heat exchanger, and the second outlet of the flue gas heat exchanger is connected to the water storage tank through the fourth pipe. The water storage tank is connected to the workshop pipeline and is used to supply heat to the workshop equipment.
[0009] As a further improvement of this utility model, a power pump is provided on the first pipeline and a power pump is provided on the third branch pipe;
[0010] The pipeline 2 is connected to the branch pipe 1 by valve 1 and valve 2 respectively. The branch pipe 1 is equipped with valve 3, the branch pipe 3 is equipped with valve 4, and the pipeline 3 is equipped with valve 5.
[0011] As a further improvement of this utility model, the upper and lower parts of the outer shell of the electrolytic cell shell heat exchange device are provided with hanging ears.
[0012] As a further improvement of this utility model, the flue gas heat exchange device is provided with a flue gas inlet, a flue gas outlet and an observation window.
[0013] As a further improvement of this utility model, the heat exchange device for the inner liner of the electrolytic cell includes a heat transfer oil tank, an air jacket, and a rolled plate heat exchanger.
[0014] The second branch pipe is connected to the first liquid inlet of the plate heat exchanger, the first liquid outlet of the plate heat exchanger is connected to the third pipe, the third inlet of the plate heat exchanger is connected to the fourth outlet of the air jacket, the third outlet of the air jacket is connected to the inlet of the thermal oil tank, and the outlet of the thermal oil tank is connected to the fourth inlet of the air jacket.
[0015] As a further improvement of this utility model, a power pump is provided on the pipeline between the heat transfer oil tank and the air jacket.
[0016] The beneficial effects of adopting the above technical solution are as follows:
[0017] This invention recovers and utilizes heat from the electrolytic cell shell, inner liner, and flue gas duct, reducing or even eliminating the impact of heat released from the electrolytic cell and flue gas on operators and the surrounding environment. The recovered heat is used in heating systems, domestic water systems, or workshop equipment to provide thermal energy, saving energy and contributing to energy conservation and emission reduction. Attached Figure Description
[0018] Figure 1 This is a flowchart of the present invention;
[0019] Figure 2 This is a schematic diagram of the structure of the heat exchange device for the shell of the electrolytic cell according to this utility model;
[0020] Figure 3 This is a schematic diagram of the flue gas heat exchange device of this utility model;
[0021] Figure 4 This is a schematic diagram of the structure of the heat exchange device for the inner liner of the electrolytic cell according to this utility model;
[0022] Explanation of markings in the diagram: 1. Electrolytic cell shell heat exchange device, 1-1 Inlet 1, 1-2 Outlet 1, 1-3 Outer shell, 1-4 Hanging lug; 2. Electrolytic cell inner tank heat exchange device, 2-1 Thermal oil tank, 2-2 Air jacket, 2-3 Plate heat exchanger, 2-4 Power pump 3, 3 Plate heat exchanger, 4 Circulating water tank, 5. Flue gas heat exchange device, 5-1 Inlet 2, 5-2 Outlet 2, 5-3 Flue gas... 5-4 Flue gas outlet, 5-5 Observation window, 6 Water storage tank, 7 Pipeline 1, 8 Pipeline 2, 9 Heating inlet pipe, 10 Heating return pipe, 11 Branch pipe 1, 12 Workshop equipment, 13 Branch pipe 2, 14 Branch pipe 3, 15 Pipeline 3, 16 Pipeline 4, 17 Power pump 1, 18 Power pump 2, 19 Valve 1, 20 Valve 2, 21 Valve 3, 22 Valve 4, 23 Valve 5, 24 Heating pump. DETAILED DESCRIPTION
[0023] To better understand the purpose, structure, and function of this utility model, a clear and complete description of this utility model will be provided below in conjunction with the accompanying drawings.
[0024] like Figures 1-4 The system shown is a waste heat recovery system in the production process of an electrolytic cell, which includes: an electrolytic cell shell heat exchange device 1, an electrolytic cell inner tank heat exchange device 2, a plate heat exchanger 3, a circulating water tank 4, a flue gas heat exchange device 5, and a water storage tank 6.
[0025] Waste heat utilization of the electrolytic cell shell: including a circulating water tank 4, an electrolytic cell shell heat exchange device 1, and a plate heat exchanger 3; wherein, the electrolytic cell shell heat exchange device 1 is as follows: Figure 2 As shown, the device includes an outer shell 1-3, an inlet 1-1, and an outlet 1-2. The upper and lower parts of the outer shell 1-3 are each provided with a hanging lug 1-4. In this embodiment, the outer shell 1-3 and the electrolytic cell shell are the same component; that is, the inlet 1-1 and outlet 1-2 are provided on the electrolytic cell shell. The inlet 1-1 is connected to the circulating water tank 4 via pipe 7, and the outlet 1-2 is connected to the inlet of the plate heat exchanger 3 via pipe 8. Cold water in the circulating water tank 4 enters the electrolytic cell shell heat exchange device 1 through the inlet 1-1, exchanges heat with the electrolytic cell shell, and heats the cold water into hot water. The hot water then flows out from the outlet 1-2 and through pipe 8 into the plate heat exchanger 3. The outlet of the plate heat exchanger 3 is connected to the circulating water tank 4, and the inlet and outlet of the plate heat exchanger 3 are connected to the heating water inlet pipe 9 and the heating water return pipe 10, respectively. Hot water exchanges heat with cold water in the heating water inlet pipe 9 in the plate heat exchanger 3, and the heated water enters the heating water return pipe 10. The cold water formed after the hot water heats up flows from the outlet into the circulating water tank 4 for reuse.
[0026] Considering that heating is not required in summer, a branch pipe 11 is provided on the second pipeline 8. The branch pipe 11 is used to supply heat to the workshop equipment 12, thereby utilizing the heat. The hot water after heat exchange cools down and enters the circulating water tank 4 for reuse. To facilitate the control of the hot water flow, valves 19 and 20 are respectively provided before and after the connection between the second pipeline 8 and the branch pipe 11. A valve 21 is provided on the branch pipe 11. In addition, a power pump 17 is provided on the first pipeline 7, and a heating pump 24 is provided on the heating inlet pipe 9 to provide power for the water flow.
[0027] Waste heat utilization in the inner tank of the electrolytic cell: A branch pipe 13 is provided on the first pipeline 7. The branch pipe 13 is connected to the inlet of the heat exchange device 2 in the inner tank of the electrolytic cell. The outlet of the heat exchange device 2 in the inner tank of the electrolytic cell is connected to the second pipeline 8 through the third pipeline 15. That is, the cold water in the circulating water tank 4 enters the heat exchange device 2 in the inner tank of the electrolytic cell for heat exchange. The resulting hot water flows through the third pipeline 15 to the second pipeline 8 and merges with the hot water generated in the waste heat utilization of the electrolytic cell shell. Then, it exchanges heat with the plate heat exchanger 3 or supplies heat to the workshop equipment 12.
[0028] like Figure 4 As shown, the heat exchange device 2 of the inner tank of the electrolytic cell includes a heat transfer oil tank 2-1, an air jacket 2-2, and a plate heat exchanger 2-3; the branch pipe 2-13 is connected to the liquid inlet 1 of the plate heat exchanger 2-3, the liquid outlet 1 of the plate heat exchanger 2-3 is connected to the pipeline 3-15, the inlet 3 of the plate heat exchanger 2-3 is connected to the outlet 4 of the air jacket 2-2, the outlet 3 of the air jacket 2-2 is connected to the oil inlet of the heat transfer oil tank 2-1, and the oil outlet of the heat transfer oil tank 2-1 is connected to the inlet 4 of the air jacket 2-2; and a power pump 3-2-4 is provided on the pipeline between the heat transfer oil tank 2-1 and the air jacket 2-2. The heat transfer oil in the heat transfer oil tank 2-1 passes through the power pump 3 2-4, then through the air jacket 2-2, and then through the plate heat exchanger 2-3 to carry out the heat between the inner tank and the shell and exchange heat with the water in the circulating water pool 4, thereby reducing the temperature of the inner tank.
[0029] Waste heat utilization of flue gas: A branch pipe 14 is provided on the first pipeline 7. The branch pipe 14 is connected to the inlet 5-1 of the flue gas heat exchanger 5. The outlet 5-2 of the flue gas heat exchanger 5 is connected to the water storage tank 6 via a fourth pipeline 16. The flue gas heat exchanger 5... Figure 3As shown, it is equipped with a flue gas inlet 5-3, a flue gas outlet 5-4, and an observation window 5-5. The cold water in the circulating water tank 4 exchanges heat with the flue gas in the flue gas heat exchange device 5. After the cold water becomes hot, it enters the water storage tank 6 for use as domestic bathing water. The water storage tank 6 is connected to the workshop pipeline to supply heat to the workshop equipment 12. When domestic water is not needed, the hot water in the water storage tank 6 enters the workshop to heat the workshop equipment 12. Furthermore, a power pump 2 18 is installed on the branch pipe 3 14 to provide power to the water in the branch pipe 3 14; and a valve 4 22 is installed on the branch pipe 3 14, and a valve 5 23 is installed on the pipeline 3 15 to control the water flow.
[0030] In addition, in this embodiment, thermometers and pressure gauges are installed on the pipelines and branch pipes. By monitoring the data online in real time, timely adjustments can be made to ensure that waste heat is fully utilized.
[0031] It is understood that this utility model has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of this utility model. Furthermore, under the teachings of this utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of this utility model. Therefore, this utility model is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of this utility model.
Claims
1. A waste heat recovery system for electrolytic cell production, characterized in that: It includes: Electrolytic cell shell heat exchange device (1), electrolytic cell inner tank heat exchange device (2), plate heat exchanger (3), circulating water pool (4), flue gas heat exchange device (5) and water storage tank (6); The inlet (1-1) of the electrolytic cell shell heat exchange device (1) is connected to the circulating water tank (4) through pipe (7), and the outlet (1-2) is connected to the inlet (1) of the plate heat exchanger (3) through pipe (8); the outlet (1) of the plate heat exchanger (3) is connected to the circulating water tank (4), and the inlet (2) and outlet (2) of the plate heat exchanger (3) are connected to the heating water inlet pipe (9) and the heating water return pipe (10) respectively; and a branch pipe (11) is provided on the pipe (8), which is used to supply heat to the workshop equipment (12); The first pipeline (7) is provided with a second branch pipe (13) and a third branch pipe (14). The second branch pipe (13) is connected to the inlet of the heat exchange device (2) of the inner tank of the electrolytic cell. The outlet of the heat exchange device (2) of the inner tank of the electrolytic cell is connected to the second pipeline (8) through the third pipeline (15). The third branch pipe (14) is connected to the second inlet (5-1) of the flue gas heat exchange device (5), the second outlet (5-2) of the flue gas heat exchange device (5) is connected to the water storage tank (6) through the fourth pipe (16), and the water storage tank (6) is connected to the workshop pipeline for supplying heat to the workshop equipment (12).
2. The waste heat recovery system in the electrolytic cell production process according to claim 1, characterized in that: The first pipeline (7) is equipped with a power pump (17), and the third branch pipeline (14) is equipped with a power pump (18). The second pipeline (8) is connected to the first branch pipe (11) by valves 1 (19) and 2 (20) respectively. The first branch pipe (11) is equipped with valve 3 (21), the third branch pipe (14) is equipped with valve 4 (22), and the third pipeline (15) is equipped with valve 5 (23).
3. The waste heat recovery system in the electrolytic cell production process according to claim 1, characterized in that: The upper and lower parts of the outer shell (1-3) of the electrolytic cell shell heat exchange device (1) are provided with hanging ears (1-4).
4. The waste heat recovery system in the electrolytic cell production process according to claim 1, characterized in that: The flue gas heat exchange device (5) is provided with a flue gas inlet (5-3), a flue gas outlet (5-4), and an observation window (5-5).
5. A waste heat recovery system for electrolytic cell production process according to claim 1, characterized in that: The heat exchange device (2) inside the electrolytic cell includes a heat transfer oil tank (2-1), an air jacket (2-2), and a plate heat exchanger (2-3). The second branch pipe (13) is connected to the liquid inlet of the plate heat exchanger (2-3), the liquid outlet of the plate heat exchanger (2-3) is connected to the third pipe (15), the inlet of the plate heat exchanger (2-3) is connected to the outlet of the air jacket (2-2), the outlet of the air jacket (2-2) is connected to the inlet of the heat transfer oil tank (2-1), and the outlet of the heat transfer oil tank (2-1) is connected to the inlet of the air jacket (2-2).
6. A waste heat recovery system for electrolytic cell production process according to claim 5, characterized in that: A power pump 3 (2-4) is installed on the pipeline between the heat transfer oil tank (2-1) and the air sleeve (2-2).