Lithium battery material roller bed furnace heat energy recovery and cooling system and method

Abstract

The invention discloses a lithium battery material roller bed furnace heat energy recovery and cooling system and method, in-furnace tail gas heat is transferred to soft water in a cavity between a superconducting pipe and an outer sleeve through the superconducting pipe, under the action of an external circulating pump set, the soft water absorbing the heat is sent out, the temperature of the tail gas in the roller bed furnace is reduced, and a positive electrode material product is cooled. According to the invention, an energy-saving system with a superconducting pipe and jacketed pipe structure is adopted, an intermediate working medium is adopted for phase change heat transfer in the superconducting pipe, heat in the furnace is extracted, and the temperature of the material is reduced to 50 DEG C from the original 150 DEG C, so that the cooling capacity of cooling air is saved, and the energy-saving effect is achieved. And meanwhile, hot water of 90 DEG C is obtained for refrigeration or heat users, heat in the furnace is utilized to the maximum extent, and energy conservation and consumption reduction are achieved. And meanwhile, the cooling capacity and the refrigerating and heating heat are saved, the comprehensive operation cost is saved, and the operation of related enterprises has higher market competitiveness.

Description

Technical Field

[0001] The present invention relates to the technical field of heat energy recovery and utilization, and in particular to a heat energy recovery and cooling system and method for a roller furnace for lithium battery materials. Background Art

[0002] In the current lithium battery material production process, the positive electrode material (hereinafter referred to as the material) is transported through an electrically heated roller furnace conveyor belt, and undergoes processes such as feeding, preheating, sintering, cooling, and discharging. As a continuous production equipment, the roller furnace consumes a lot of electricity during the material preheating and sintering process, and the energy consumption is very high. At the tail of the kiln, the material needs to be cooled to a reasonable temperature to facilitate the subsequent process production needs. The hot air in the furnace is discharged out of the furnace through the circulating fan, and the cooling at the tail of the furnace also requires cold air cooling. The total heat loss is about 30%.

[0003] The industry currently uses flue gas heat exchangers, which use the heat from the hot air discharged by the fan to heat the fresh air for the spray drying section. This is an external waste heat device outside the furnace. In order to prevent dust accumulation from affecting the heat exchange effect of the flue gas heat exchanger, it is necessary to be equipped with a single-stage or multi-stage cyclone dust removal device or a bag dust removal device in series. The exhaust temperature is relatively low. The advantage is that there is no need to worry about leakage problems that will pollute materials and affect production safety and stability. The disadvantage is that only a part of the convection heat is recovered, and a large amount of radiant heat in the furnace is not recovered. It also increases equipment investment and system complexity, which increases the cost of system operation. In addition, this method can only produce hot air for drying, and cannot be used for refrigeration. For the summer refrigeration needs in southern my country, its flexibility is slightly insufficient.

[0004] Another energy-saving method in the industry is to use the heat energy of the exhaust gas in the furnace to generate steam, which is provided to other processes in the production workshop. The steam pressure is generally 0.5MPaG and 0.8MPaG. It is a built-in waste heat equipment. The heat exchange tube bundle needs to be arranged in the furnace to utilize the high-temperature radiant heat in the furnace and maximize the recovery of heat and steam output. The advantage of this method is that it utilizes more heat in the furnace, including radiant heat. The disadvantage is also obvious. Once leaked, it will cause immeasurable losses to production; and due to the existence of steam pipes and steam drums, the user's operation and maintenance burden is also increased.

[0005] Patent application number CN201320306212.3 discloses a roller furnace heat energy recovery and utilization system, which recovers heat energy to a certain extent by transporting the heat source in the cooling zone to the heating zone through the waste heat recovery pipe and the waste heat output pipe. However, it still fails to effectively recover the large amount of radiant heat in the furnace.

[0006] In view of the above, it is necessary to propose a heat recovery and cooling system and method for a lithium battery material roller furnace to solve the above problems. Summary of the invention

[0007] The purpose of the present invention is to overcome the defects in the prior art and provide a heat recovery and cooling system and method for a roller furnace for lithium battery materials.

[0008] To achieve the above-mentioned purpose, the technical scheme of the present invention is as follows: a heat recovery and cooling system for a lithium battery material roller furnace, comprising a superconducting tube waste heat utilization loop, which includes superconducting tube rows arranged in various sections in the roller furnace, the superconducting tube rows including a plurality of superconducting tube structures, one end of the superconducting tube structure is inserted into the roller furnace to contact with the hot atmosphere, and the other end is placed outside the furnace, and a jacket pipe is provided at one end outside the furnace, a working medium phase change cavity is formed in the superconducting tube, a medium flow cavity is formed between the outer wall of the superconducting tube and the inner wall of the jacket pipe, and the working medium phase change cavity and the medium flow cavity are isolated from each other; an intermediate working medium is filled in the superconducting tube, and in actual use, the intermediate working medium can be selected from water, organic matter, Freon refrigerant, ammonia (NH3), alkane and a mixture thereof, etc. For the application of the lithium battery material roller furnace, considering the working environment and temperature conditions, those working mediums that can stably exist at a higher temperature, such as organic compounds or water, may be preferentially selected; the intermediate working medium is closed and circulated in the superconducting tube, and it is separated from the jacket pipe, so there is no need to worry about the problem of large-scale leakage.

[0009] The superconducting waste heat utilization loop also includes a water supply main, a return water main, a waste heat circulation pump, and a user end, such as Figure 1 As shown; the two ends of the medium flow cavity formed by several jacketed pipes are respectively connected to the water supply main pipe and the return water main pipe, and the superconductor is used to absorb the heat source in the furnace and transfer the heat to the medium circulating in the medium flow cavity; the other ends of the water supply main pipe and the return water main pipe are connected to the user end, and the waste heat circulation pump is arranged on the pipeline to form a circulation loop. The lower part of the superconductor is inserted into the furnace, and one end absorbs heat in the furnace, and transfers the heat to the soft water in the medium flow cavity at the upper part of the superconductor. The heated soft water is pumped to the user end, which can be a refrigeration device for refrigeration, or a hot user end, and the soft water returns to the circulation loop after cooling.

[0010] Furthermore, the superconducting tube structure is inserted into the roller hearth furnace in an inclined arrangement, and the superconducting tube structure is arranged at an angle of 15-35° to the horizontal furnace top of the roller hearth furnace. Preferably, the superconducting tube and its casing are arranged at an inclined angle of 25° to the horizontal furnace top of the roller hearth furnace, and the manifold is arranged horizontally; the inclined arrangement of the superconducting tube can enhance the absorption effect of thermal radiation. According to the thermal radiation heat transfer theory, distance and temperature difference are key factors in radiation heat transfer. Therefore, according to the simulation results, Figure 2-4 As shown, the superconducting tube is arranged and tilted at a certain angle to increase the radiation heating surface; the superconducting tube is safe and reliable, and its two ends are welded and closed. Due to its small diameter and good pressure bearing capacity, the working fluid undergoes phase change inside it, and the amount added is small.

[0011] Furthermore, the part of the superconductor inserted into the furnace adopts low-fin tubes and is coated with nano heat-absorbing radiation coating. The use of low-fin tubes instead of high-fin tubes or other types of fin tubes is found through simulation, such as Figure 3 , 4 As shown, the heat in the furnace is mainly radiant heat, supplemented by convection heat. The height of the fins affects the heat transfer, and the attenuation increases proportionally with the distance. The use of low-fin tubes and heat-absorbing radiation coatings is mainly to absorb heat radiation, taking into account convection heat transfer, and maximizing the absorption of heat in the furnace.

[0012] Furthermore, the superconducting tube row also includes a collection tube, which is used in pairs, and a plurality of superconducting tube structures are arranged in parallel between each pair of collection tubes to form a tube row unit. The collection tubes are arranged horizontally, and a plurality of tube row units are arranged in sequence in different sections of the roller furnace, and the tube row units are arranged in series or in parallel. Considering the temperature control of the outlet water of each tube row unit, since the temperature in the heating section, the cooling section, and the cooling section is different, if each tube row unit is arranged in parallel, then the outlet temperature in the high temperature section must be high, while the outlet temperature in the low temperature section is relatively low. Considering the balanced temperature, the tube row units can be arranged in parallel in the high temperature section, and multiple tube row units can be connected in series in the low temperature section, so that the soft water is heated in multiple stages in the low temperature section, thereby increasing the temperature of the series tube row units that finally enter the return water main pipe, so that the temperature difference between them and the high temperature section tube row units entering the return water main pipe is small.

[0013] Furthermore, the user end is a waste heat utilization refrigerator, which is also provided with a cooling circulation loop, and a cooling circulation pump and a cooling tower are provided on the cooling circulation loop. In actual use, a waste heat utilization refrigerator of a lithium bromide absorption heat pump can be used, and the heat in the soft water is used as the heat source of the generator in the heat pump, and the cooling circulation loop is used as the cold source of the heat pump.

[0014] Furthermore, the water supply main pipe includes a superconducting water supply branch pipe and a tail gas water supply branch pipe arranged in parallel, and the return water main pipe includes a superconducting water return branch pipe and a tail gas water return branch pipe arranged in parallel.

[0015] Furthermore, an intermediate water tank is provided on the return water main pipe, a waste heat circulation pump is connected to the lower part of the intermediate water tank, and a user end is provided downstream of the waste heat circulation pump.

[0016] Furthermore, it also includes a tail gas waste heat utilization circuit, which includes an induced draft fan and an tail gas heat exchanger. The tail gas heat exchanger is used for heat exchange between high-temperature flue gas and circulating water. The water inlet on the water path of the tail gas heat exchanger is connected to the water supply main pipe, and the water outlet is connected to the water outlet main pipe. The air inlet end of the induced draft fan is connected to the tail gas pipe of the roller furnace, and the air outlet end is connected to the gas inlet of the tail gas heat exchanger, so that the superconducting tube waste heat utilization circuit and the tail gas waste heat utilization circuit are arranged in parallel.

[0017] An induced draft fan is added outside the furnace to carry out the remaining exhaust gas heat with the exhaust air. Two exhaust gas heat exchangers are placed outside the furnace to heat soft water and transfer heat through complete convection. A waste heat utilization loop is added in parallel with the soft water heated by the superconducting tube to further utilize the exhaust gas heat and improve the overall utilization rate of waste heat.

[0018] A method for heat recovery and cooling system of a lithium battery material roller furnace comprises the following steps: Step 1, configuration of the superconducting tube waste heat utilization loop, inserting the superconducting tube into the roller furnace at an angle of 15-35 degrees, so that one end of the superconducting tube structure contacts the hot atmosphere in the furnace, and the other end is placed outside the furnace through a jacket pipe; A collection pipe is arranged in the superconducting tube row, and a plurality of superconducting tube structures are connected in parallel between each pair of collection pipes to form a tube row unit, and the tube row units are arranged in different sections of the roller furnace; Step 2: Establish the flow path of the circulating medium. Connect the two ends of the medium flow cavity formed by each jacketed pipe through the water supply main pipe and the return water main pipe to form a complete circulation loop. Set an intermediate water tank on the return water main pipe, connect the waste heat circulation pump at the bottom, and connect the user end at the downstream to ensure water flow balance and stable supply. Step 3, using the exhaust gas waste heat utilization loop, using an induced draft fan to introduce high-temperature flue gas from the exhaust pipe of the roller hearth furnace into the exhaust gas heat exchanger for heat exchange; the water inlet on the water path of the exhaust gas heat exchanger is connected to the upper water main pipe, and the water outlet is connected to the outlet water main pipe to form a complete exhaust gas waste heat utilization loop; Step 4, user-side heat demand matching, according to the user's needs, adjust the water temperature and water volume entering the user to match the heat demand; for the user equipped with a cooling circulation loop, monitor the working status of the cooling tower and the flow of the cooling circulation pump to ensure that the cooling water temperature is suitable for the refrigerator demand.

[0019] Furthermore, in step 1, the atmosphere temperature in the roller furnace in the heating section is 170-200°C, and the material is cooled to 100°C in the heating section; The atmosphere temperature in the roller furnace cooling section is 80-120°C, and the material is cooled to 50°C in the cooling section; The atmosphere temperature in the roller furnace cooling section is 300-350℃, and the material is cooled to 100℃ in the cooling section.

[0020] The advantages and beneficial effects of the present invention are as follows: the present invention adopts an energy-saving system of a superconducting tube and a jacketed casing structure, and uses an intermediate working fluid to transfer heat by phase change in the superconducting tube to extract heat in the furnace, thereby reducing the material temperature from the original 150 degrees to 50 degrees, thereby saving the cooling air and obtaining 90 degrees Celsius hot water for cooling or heating users, maximizing the use of heat in the furnace and saving energy and reducing consumption.

[0021] The present invention solves the problem of deep utilization of waste heat in the production of lithium battery material roller furnaces. On the basis of slightly increasing the power consumption of the circulating water pump group, the heat of the system is extracted and utilized to the maximum extent, thereby saving cooling air cooling capacity and generating cold or hot water heat, thereby achieving two-way benefits. Specifically, the superconducting fluid reduces the furnace atmosphere from the original 80-350 degrees to 50 degrees. The heat of this temperature difference is the saved cooling air cooling capacity. At the same time, this part of the extracted energy is absorbed by soft water, which is equivalent to the heat of reheating soft water with a temperature difference of 20 degrees from 70 degrees to 90 degrees. Therefore, the energy-saving benefit is huge. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic flow diagram of a heat recovery and cooling system of a roller furnace for lithium battery materials of the present invention; Figure 2 It is a connection diagram of the superconducting tube row in the present invention; Figure 3 The temperature cloud diagram of the super catheter in the present invention is displayed; Figure 4 It is the material temperature cloud diagram display in the present invention; In the figure: 1. superconducting tube waste heat utilization loop; 2. superconducting tube row; 3. superconducting tube structure; 4. jacketed tube; 5. medium flow cavity; 6. water supply main pipe; 7. return water main pipe; 8. waste heat circulation pump; 9. user end; 10. tail gas waste heat utilization loop; 11. tail gas heat exchanger; 12. water supply port; 13. water outlet; 14. gas inlet; 15. low-fin tube; 16. manifold; 17. tube row unit; 18. superconducting water supply branch pipe; 19. tail gas water supply branch pipe; 20. superconducting return water branch pipe; 21. tail gas return water branch pipe; 22. intermediate water tank; 23. cooling circulation loop; 24. cooling circulation pump; 25. cooling tower. DETAILED DESCRIPTION

[0023] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention.

[0024] A heat recovery and cooling system for a roller furnace of lithium battery materials. The superconducting tube row 2 inserted into the furnace is arranged obliquely on the top of each section of the roller furnace according to a certain arrangement mode. The lower part of each superconducting tube structure 3 contacts the hot atmosphere in the furnace to absorb the convection heat and radiation heat in the furnace. The upper part of each superconducting tube extends out of the furnace, and a jacket tube 4 is welded on the outside, so that a medium flow cavity 5 is formed between the superconducting tube and the jacket tube 4. Soft water is pumped into the cavity by a waste heat circulation pump 8. The intermediate working medium inside the superconducting tube absorbs heat in the furnace and transfers the heat to the soft water in the medium flow cavity 5 channel at the upper part of the superconducting tube. The heated soft water is pumped to the refrigeration equipment for refrigeration, or to the end of the heat user, and returns after cooling to form a circulation loop for the next cycle. The intermediate working medium in the superconducting tube changes phase through evaporation and condensation, which plays a role in heat transfer. In the closed interior of the superconducting tube, a closed cycle is formed.

[0025] Two sets of induced draft fans are set up outside to lead out the exhaust gas in the furnace, and an exhaust gas heat exchanger 11 is configured to heat soft water. In this way, the superconducting tube and the exhaust gas heat exchanger 11 form a recycling of two kinds of waste heat in the roller furnace. After heating the soft water respectively, they are summarized into a main pipe and pumped out to the refrigeration equipment or the heat terminal. In order to realize the above principles, 1. The superconducting tube adopts low-fin tubes and is coated with a heat-absorbing radiation coating. The use of low-fin tubes instead of high-fin tubes or other types of finned tubes is based on the simulation. It is found that the heat in the furnace is mainly radiant heat, supplemented by convection heat. The height of the fin affects the heat transfer, and the attenuation increases proportionally with the increase of distance. The use of low-fin tubes and heat-absorbing radiation coatings is mainly to absorb heat radiation, taking into account convection heat transfer, and maximizing the absorption of heat in the furnace; 2. The superconducting tube is arranged at an angle. Through a certain arrangement method, the absorption effect of thermal radiation can be enhanced. According to the thermal radiation heat transfer theory, distance and temperature difference are the key factors of radiation heat transfer. Therefore, according to the simulation results, the layout A superconduct is placed and tilted at a certain angle to increase the radiation heating surface. The superconduct is arranged at an angle of 25° with the horizontal furnace top of the roller furnace, and the manifold 16 is arranged horizontally; the superconduct is safe and reliable, and its two ends are welded and closed. Due to the small diameter and good pressure bearing capacity, the working fluid undergoes phase change inside it, and the amount added is small; the soft water in the jacket pipe 4 outside the furnace and the annular space of the superconduct will not leak into the furnace because the superconduct is used as isolation; 3. The induced draft fan outside the furnace takes the remaining exhaust gas heat out with the exhaust air, and two exhaust gas heat exchangers 11 are placed outside the furnace to heat the soft water, completely convectively transfer heat, and form a parallel connection with the soft water heated by the superconduct to further utilize the exhaust gas heat. By setting up a waste heat circulation pump 8, the flow and pressure of the intermediate medium entering the system can be adjusted, and the valve instrument set can automatically detect and adjust the operation of the system.

[0026] The roller furnace is divided into three sections according to the material feeding direction and process requirements, namely, the heating section, the cooling section and the cooling section. Correspondingly, superconducting tubes and their jacketed tubes 4 are respectively arranged in each section, wherein the heating section superconducting tubes and their jacketed tubes 4 are arranged on the furnace top of the heating section in the furnace, and the furnace atmosphere is electrically heated hot air; the cooling section superconducting tubes and their jacketed tubes 4 are arranged on the furnace top of the cooling section in the furnace, and the furnace atmosphere is cooling air; the cooling section superconducting tubes and their jacketed tubes 4 are arranged on the furnace top of the cooling section in the furnace, and the furnace atmosphere is cooling air. As the roller furnace is produced, the temperature of the materials in each section of the furnace reaches a balance between input and output heat after the heat is transmitted by the above three sections of superconducting tubes, and the output heat is timely and effectively utilized, achieving the dual effects of material cooling and thermal energy utilization; Combined with Figure 1 It can be seen that the core idea of ​​the present invention lies in the use of the superconducting tube and its jacketed tube 4, which absorbs the waste heat in the roller furnace and is used to heat soft water. The heated soft water in the tail gas heat collector is then collected and stored in a water tank for buffering. The water is then used as a heat source through a pipeline system to be sent to a refrigerator or user's heat-using equipment for cooling or heating, and is assisted by supporting equipment such as pumps, valves, instruments, and pipelines to absorb and release heat in a cycle.

[0027] Combined with Figure 1 It can be seen that the specific process of the present invention is: a complete set of devices consisting of a superconducting tube and its jacketed tube 4, a manifold 16, an exhaust gas heat exchanger 11 and its affiliated pipeline instrument valve pump group constitutes an exhaust gas waste heat utilization loop 10. The main heat transfer element is a superconducting low-fin tube, which is coated with a nano heat-absorbing radiation coating on the outside, and is welded and connected to the furnace top cover in the middle. The lower part of the superconducting tube is inserted into the furnace at a certain depth, and the upper part of the superconducting tube is welded to the jacketed tube 4 to form a jacket type. Multiple sets of casings are welded and connected to the manifold 16 in parallel, and heat is transferred through the wall of the superconducting tube. The manifold 16 is connected to the water pipeline and is connected to the intermediate water tank 22 through a water pipe. A circulating pump group is provided to provide power for soft water circulation; two sets of waste heat circulation pumps 8 are arranged in parallel, one for use and one for standby. The soft water in the intermediate water tank 22 is sent to the heat or refrigeration equipment through the waste heat circulation pump 8. The soft water continuously absorbs heat in the roller furnace as the production proceeds, and releases the heat energy in the heat or refrigeration equipment. Specifically, the superconducting tube is arranged in sections along the feeding direction of the roller hearth furnace. The superconducting tube and its jacketed tube 4 are first collected through a collecting pipe 16 and then connected in parallel with the soft water outlet pipeline of the tail gas heat exchanger 11. After absorbing the radiation heat and convection heat of the roller hearth furnace, the soft water is heated from 70 degrees Celsius to 90 degrees Celsius and sent to the refrigerator or the user end 9 that uses heat.

[0028] Combined with Figure 2 It can be seen that the superconducting tube of the present invention adopts a low-fin tube 15, which is welded with a jacket tube 4 on the outside and is collected together in a collecting tube 16. The superconducting tube and the jacket tube 4 are arranged together at a certain angle on the furnace top, soft water flows in the annular channel between the two, and the superconducting tube working medium flows in the superconducting tube to continuously exchange heat.

[0029] Combined with Figure 3 It can be seen that the temperature cloud diagram of the superconducting tube of the present invention shows that the temperature distribution is uniform and the heat transfer effect exceeds that of ordinary heat exchange tubes.

[0030] Combined with Figure 4 It can be seen that the material temperature cloud diagram of the present invention shows that the material temperature is reduced to 50 degrees Celsius, and the cooling effect is good.

[0031] Specifically, the atmosphere temperature in the roller hearth furnace heating section is 170-200 degrees Celsius, which is cooled to 100 degrees Celsius; the atmosphere temperature in the roller hearth furnace cooling section is 80-120 degrees Celsius, which is cooled to 50 degrees Celsius; the atmosphere temperature in the roller hearth furnace cooling section is 300-350 degrees Celsius, which is cooled to 100 degrees Celsius; soft water circulates, and the circulation temperature is 70-90 degrees Celsius.

[0032] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A heat recovery and cooling system for a lithium battery material roller furnace, characterized in that: It comprises a superconducting tube waste heat utilization loop, which comprises superconducting tube rows arranged in various sections in the roller hearth furnace, the superconducting tube rows comprising a plurality of superconducting tube structures, one end of the superconducting tube structure is inserted into the roller hearth furnace to contact with the hot atmosphere, and the other end is placed outside the furnace, a jacketed tube is provided at one end outside the furnace, a working medium phase change cavity is formed in the superconducting tube, a medium flow cavity is formed between the outer wall of the superconducting tube and the inner wall of the jacketed tube, and the working medium phase change cavity and the medium flow cavity are isolated from each other; The superconducting tube waste heat utilization loop also includes a water supply main pipe, a return water main pipe, a waste heat circulation pump, and a user end; the two ends of the medium flow cavity formed by a plurality of jacketed pipes are respectively connected to the water supply main pipe and the return water main pipe, and the superconducting tube absorbs the heat source in the furnace and transfers the heat to the medium circulating in the medium flow cavity; the other ends of the water supply main pipe and the return water main pipe are connected to the user end, and the waste heat circulation pump is arranged on the pipeline to form a circulation loop.

2. A lithium battery material roller furnace heat recovery and cooling system according to claim 1, characterized in that: It also includes a tail gas waste heat utilization circuit, which includes an induced draft fan and a tail gas heat exchanger. The tail gas heat exchanger is used for heat exchange between high-temperature flue gas and circulating water. The water inlet on the water path of the tail gas heat exchanger is connected to the upper water main pipe, and the water outlet is connected to the outlet water main pipe. The air inlet end of the induced draft fan is connected to the tail gas pipe of the roller furnace, and the air outlet end is connected to the gas inlet of the tail gas heat exchanger, so that the superconducting tube waste heat utilization circuit and the tail gas waste heat utilization circuit are arranged in parallel.

3. A lithium battery material roller furnace heat energy recovery and cooling system according to claim 1, characterized in that: The superconducting tube structure is inserted into the roller hearth furnace in an inclined arrangement, and the superconducting tube structure is arranged at an angle of 15-35 degrees to the horizontal furnace top of the roller hearth furnace.

4. A lithium battery material roller furnace heat recovery and cooling system according to claim 3, characterized in that: The part of the superconductor inserted into the furnace adopts low-fin tubes and is coated with nano heat-absorbing radiation coating.

5. The heat recovery and cooling system for a lithium battery material roller furnace according to claim 1, characterized in that: The superconducting tube row also includes collecting tubes, which are used in pairs. Several superconducting tube structures are arranged in parallel between each pair of collecting tubes to form a tube row unit. The collecting tubes are arranged horizontally. Several tube row units are arranged in sequence in different sections of the roller furnace. The tube row units are arranged in series or in parallel.

6. A lithium battery material roller furnace heat recovery and cooling system according to claim 2, characterized in that: The water supply main pipe includes a superconducting water supply branch pipe and a tail gas water supply branch pipe arranged in parallel, and the water return main pipe includes a superconducting water return branch pipe and a tail gas water return branch pipe arranged in parallel.

7. A lithium battery material roller furnace heat energy recovery and cooling system according to claim 6, characterized in that: An intermediate water tank is arranged on the return water main pipe, a waste heat circulation pump is connected to the lower part of the intermediate water tank, and a user end is arranged downstream of the waste heat circulation pump.

8. A lithium battery material roller furnace heat recovery and cooling system according to claim 7, characterized in that: The user end is a waste heat utilization refrigerator, which is also provided with a cooling circulation loop, and a cooling circulation pump and a cooling tower are provided on the cooling circulation loop.

9. A method for heat recovery and cooling system of a lithium battery material roller furnace according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1, configuration of the superconducting tube waste heat utilization loop, inserting the superconducting tube into the roller furnace at an angle of 15-35 degrees, so that one end of the superconducting tube structure contacts the hot atmosphere in the furnace, and the other end is placed outside the furnace through a jacket pipe; A collection pipe is arranged in the superconducting tube row, and a plurality of superconducting tube structures are connected in parallel between each pair of collection pipes to form a tube row unit, and the tube row units are arranged in different sections of the roller furnace; Step 2: Establish the flow path of the circulating medium. Connect the two ends of the medium flow cavity formed by each jacketed pipe through the water supply main pipe and the return water main pipe to form a complete circulation loop. Set an intermediate water tank on the return water main pipe, connect the waste heat circulation pump at the bottom, and connect the user end at the downstream to ensure water flow balance and stable supply. Step 3, using the exhaust gas waste heat utilization loop, using an induced draft fan to introduce high-temperature flue gas from the exhaust pipe of the roller hearth furnace into the exhaust gas heat exchanger for heat exchange; the water inlet on the water path of the exhaust gas heat exchanger is connected to the upper water main pipe, and the water outlet is connected to the outlet water main pipe to form a complete exhaust gas waste heat utilization loop; Step 4, user-side heat demand matching, according to the user's needs, adjust the water temperature and water volume entering the user to match the heat demand; for the user equipped with a cooling circulation loop, monitor the working status of the cooling tower and the flow of the cooling circulation pump to ensure that the cooling water temperature is suitable for the refrigerator demand.

10. The method for heat recovery and cooling system of a lithium battery material roller furnace according to claim 9, characterized in that: In the step 1, the atmosphere temperature in the roller furnace heating section is 170-200°C, and the material is cooled to 100°C in the heating section; The atmosphere temperature in the roller furnace cooling section is 80-120°C, and the material is cooled to 50°C in the cooling section; The atmosphere temperature in the roller furnace cooling section is 300-350℃, and the material is cooled to 100℃ in the cooling section.

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