A cooling device for an electrically heated tunnel kiln for lithium battery materials

Abstract

This utility model discloses a cooling device for an electrically heated lithium battery material tunnel kiln, belonging to the field of tunnel kiln cooling technology. It includes a frame, an insulation layer, a track, multiple saggers, and a kiln car. The insulation layer is disposed on the inner wall of the frame. The track is disposed at the bottom of the frame along the length of the tunnel kiln. The kiln car is rotatably connected to the track. The multiple saggers are spaced apart on the kiln car. It also includes cooling pipes, a liquid supply pipe, a liquid discharge pipe, a liquid cooling station, and a circulation tower. The end of the cooling pipe is connected to the top of the frame and extends into the gap between the multiple saggers. Both ends of the liquid supply pipe are connected to one end of the cooling pipe and the liquid cooling station, respectively. Both ends of the liquid discharge pipe are connected to the other end of the cooling pipe and the circulation tower, respectively. The cooling pipes can be evenly distributed on both sides of the saggers, ensuring uniform material cooling and high consistency in material forming.

Description

Technical Field

[0001] This utility model relates to the field of tunnel kiln cooling technology, specifically to a cooling device for an electrically heated lithium battery material tunnel kiln. Background Technology

[0002] In the production process of lithium battery materials in tunnel kilns, after sintering, the materials need to be cooled and shaped to improve production efficiency. The cooling process has a significant impact on product quality and process stability. Currently, there are two main cooling methods: one is to arrange cold air blowers on both sides of the kiln and directly blow cold air into the saggers to cool them; the other is to install water-cooled pipes on both sides of the kiln and use circulating cooling water to remove heat. However, both of these cooling methods have significant shortcomings. When using the direct cold air blowing method, a large amount of nitrogen needs to be continuously introduced as a protective atmosphere to maintain the internal sealing of the kiln and control the oxygen content, which not only increases production costs but may also lead to uneven temperature distribution within the kiln. On the other hand, when using water-cooled pipes on both sides, the heat exchange distance between the cooling medium and the saggers in the middle area is relatively long, resulting in a significantly weaker cooling effect in the middle saggers compared to the sides. The large number of saggers in the kiln leads to uneven cooling, ultimately causing the temperature of the material in the middle to be significantly higher when exiting the kiln, affecting the consistency of product shaping. This uneven cooling phenomenon not only prolongs the production cycle but may also lead to localized overheating of the material, affecting material properties. Furthermore, existing cooling methods generally have low heat exchange efficiency, making it difficult to meet the precise temperature control requirements of high-energy-density lithium battery materials. Therefore, a tunnel kiln cooling device capable of achieving uniform and efficient cooling is needed to improve product quality and production efficiency. Utility Model Content

[0003] The purpose of this invention is to provide a cooling device for an electrically heated tunnel kiln for lithium battery materials, which solves the problems of uneven cooling of high-temperature materials and low heat dissipation efficiency in existing tunnel kilns.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A cooling device for an electrically heated lithium battery material tunnel kiln includes a frame, an insulation layer, a track, multiple saggers, and kiln cars. The insulation layer is disposed on the inner wall of the frame. The track is disposed at the bottom of the frame along the length of the tunnel kiln. The kiln cars are rotatably connected to the track. The multiple saggers are spaced apart on the kiln cars. The device also includes cooling pipes, liquid supply pipes, liquid discharge pipes, a liquid cooling station, and a circulation tower. The end of the cooling pipe is connected to the top of the frame and extends into the gap between the multiple saggers. The two ends of the liquid supply pipe are respectively connected to one end of the cooling pipe and the liquid cooling station. The two ends of the liquid discharge pipe are respectively connected to the other end of the cooling pipe and the circulation tower. The cooling pipes can be evenly distributed on both sides of the saggers, so that the material is cooled evenly and the material forming consistency is high.

[0006] Furthermore, it also includes sealing flanges, both ends of which are connected to the top of the frame for mounting the cooling pipes and facilitating the circulation of the cooling medium within the water-cooled pipes.

[0007] Furthermore, the outer wall of the cooling pipe is provided with heat exchange fins, which extend outward from the outer peripheral wall of the cooling pipe to increase the heat exchange area and thus improve the heat dissipation efficiency.

[0008] Preferably, the heat exchange fins are spirally arranged around the axis of the cooling pipe to fully expand the heat exchange area.

[0009] Preferably, the cooling pipe is configured as a U-shaped pipe, which has a simple structure and is easy to arrange.

[0010] Furthermore, it also includes a liquid supply valve and a circulation valve. The liquid supply valve is located between one end of the cooling pipe and the liquid cooling station, and the circulation valve is located between the other end of the cooling pipe and the circulation tower. These valves are used to control the flow rate of the cooling medium, thereby controlling the temperature drop.

[0011] Furthermore, the two side walls of the kiln car protrude outward to form a sealing part, and the two side walls of the frame are provided with sealing grooves. The sealing part and the sealing groove are fitted together with a gap to prevent heat from spreading to the bottom of the kiln car and to play a role in heat insulation.

[0012] Preferably, a sealing groove is also included, wherein the two side walls of the kiln car extend downward to form a sealing sheet, the sealing groove is disposed below the kiln car, the sealing groove is filled with a sealing medium, and the sealing sheet is inserted into the sealing groove to prevent external gas from entering.

[0013] Preferably, the system also includes a tray, which is placed on the kiln car and the bottom surface of the tray is spaced from the end face of the kiln car. The sagger is placed on the tray and can exchange heat from all sides.

[0014] More preferably, the downward-facing end of the cooling pipe extends beyond the bottom surface of the tray, making full use of the space inside the kiln and expanding the heat absorption capacity of the cooling pipe.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) The cooling device for the tunnel kiln of electrically heated lithium battery material sets the cooling pipes between multiple rows of saggers on the kiln car, so that the heat on both sides of each row of saggers can be effectively absorbed, so that the material in each sagger is cooled evenly, ensuring the consistency of material forming. The cooling pipes are arranged in rows along the moving direction of the kiln car, making full use of the internal space of the kiln and improving the heat absorption efficiency. Compared with the traditional method of direct cold air blowing or water cooling pipes on both sides, the cooling pipes are directly inserted into the gaps between the materials, which greatly shortens the heat exchange distance, making the saggers in each area of ​​the kiln cool more evenly, avoiding the problem of insufficient cooling in the middle area caused by uneven heat transfer in the traditional method, significantly improving the temperature consistency of lithium battery material and ensuring stable product performance.

[0017] (2) The cooling device for the electric heating lithium battery material tunnel kiln installs the cooling pipe from the top of the kiln through a sealing flange into the kiln. It uses liquid cooling medium for cooling. The cooling medium enters the cooling pipe through the liquid supply pipe, absorbs heat, and then flows back to the circulation tower through the liquid discharge pipe for heat exchange, forming a highly efficient closed-loop cooling. Spiral heat exchange fins are provided on the outer wall of the cooling pipe to increase the heat exchange area, thereby improving the efficiency of heat exchange. Attached Figure Description

[0018] Figure 1 A front view of the cooling device for an electrically heated lithium battery material tunnel kiln provided by this utility model;

[0019] Figure 2 A cross-sectional structural diagram of the cooling device for an electrically heated lithium battery material tunnel kiln provided by this utility model.

[0020] Figure label:

[0021] 1. Cooling pipe; 11. Heat exchange fins; 12. Sealing flange; 2. Kiln car; 21. Tray; 22. Wheel; 23. Track; 3. Liquid supply pipe; 31. Liquid supply valve; 4. Liquid cooling station; 5. Drainage pipe; 51. Circulation valve; 6. Circulation tower; 7. Frame; 71. Insulation layer; 72. Sealing groove; 73. Sealing plate; 74. Sealing part; 75. Sealing groove; 8. Sagger. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0023] Example 1

[0024] like Figures 1-2 As shown, this embodiment discloses a cooling device for an electrically heated lithium battery material tunnel kiln, including a frame 7, an insulation layer 71, a track 23, multiple saggers 8, and a kiln car 2. The insulation layer 71 is disposed on the inner wall of the frame 7. The track 23 is disposed at the bottom of the frame 7 along the length of the tunnel kiln. The kiln car 2 is rotatably connected to the track 23. Multiple saggers 8 are spaced apart on the kiln car 2. Specifically, the multiple saggers 8 are arranged in a matrix at intervals on the kiln car 2, with a spacing of 50-150mm between adjacent saggers 8. The cooling device also includes a cooling pipe 1 and a liquid supply pipe 3. The cooling pipe 1 is connected to the top of the frame 7 at the end of the drain pipe 5, and extends into the gap between multiple saggers 8. The two ends of the supply pipe 3 are connected to one end of the cooling pipe 1 and the liquid cooling station 4, respectively. The two ends of the drain pipe 5 are connected to the other end of the cooling pipe 1 and the circulation tower 6, respectively. After the cooling medium enters the cooling pipe 1 through the supply pipe 3 to absorb the heat in the kiln, it flows back to the circulation tower 6 through the drain pipe 5 for heat exchange, and discharges the heat to the outside, forming a highly efficient closed-loop circulating cooling system. The cooling medium is reused and the circulation efficiency is high.

[0025] In the heating section of the kiln, the heating device is set in the gap between multiple saggers 8, and the cooling pipe 1 and the heating device are installed in the same relative position, which reduces the difficulty of kiln layout.

[0026] Preferably, multiple and / or rows of cooling pipes 1 are arranged along the traveling direction of the kiln car 2, thereby increasing the heat absorption efficiency by increasing the density of cooling pipes 1 in the kiln.

[0027] Preferably, the insulation layer 71 is made of refractory bricks or ceramic fibers, which have the advantages of high temperature resistance, wear resistance and easy construction.

[0028] Furthermore, it also includes a sealing flange 12. Both ends of the cooling pipe 1 are connected to the top of the frame 7 by the sealing flange 12. The sealing flange 12 fixes the cooling pipe 1 to the top of the frame 7. The cooling pipe 1 is a hollow pipe, and both ends of it extend from through the insulation layer 71 to the outside of the kiln for the input and output of the cooling medium.

[0029] Furthermore, heat exchange fins 11 are provided on the outer wall of the cooling pipe 1. The heat exchange fins 11 extend outward from the outer peripheral wall of the cooling pipe 1 and are in direct contact with the air inside the kiln. By increasing the contact area, the efficiency of heat transfer is increased, thereby improving the heat absorption.

[0030] Preferably, the heat exchange fins 11 are spirally arranged around the axis of the cooling pipe 1 to make full use of the space on the outer wall of the cooling pipe 1 and improve the heat absorption efficiency.

[0031] Preferably, the cooling pipe 1 is configured as a U-shaped pipe, with both ends of the cooling pipe 1 extending from the top of the frame 7, which facilitates installation and cooling medium circulation. The thin U-shaped pipe can make full use of the gap between the crucibles 8.

[0032] Furthermore, it also includes a liquid supply valve 31 and a circulation valve 51. The liquid supply valve 31 is located between one end of the cooling pipe 1 and the liquid cooling station 4, and the circulation valve 51 is located between the other end of the cooling pipe 1 and the circulation tower 6. Both the liquid supply valve 31 and the circulation valve 51 are solenoid valves, which can control the circulation flow rate of the cooling medium in the cooling pipe 1 and play a role in accurately reducing the temperature.

[0033] Furthermore, the two side walls of the kiln car 2 protrude outward to form a sealing part 74, and the two side walls of the frame 7 are provided with sealing grooves 72. The sealing part 74 and the sealing grooves 72 are fitted together to form a curved seal, which is used to prevent heat from spreading to the bottom of the kiln car and to play a role in heat insulation.

[0034] Furthermore, it also includes a sealing groove 75. The two side walls of the kiln car 2 extend downward to form sealing plates 73. The sealing groove 75 is located below the kiln car 2 and is filled with a sealing medium. Specifically, the sealing groove 75 is located at the lower open end of the curved seal. The sealing medium is high-temperature resistant silicone oil or sand. The sealing plate 73 is inserted into the sealing groove 75. The sealing plate 73 and the flowable sealing medium form a dynamic seal to prevent external gas from seeping in, ensuring the stability of the atmosphere inside the kiln and ensuring the quality of material forming.

[0035] Preferably, the system also includes a tray 21, which is placed on the kiln car 2 and has a gap between the bottom surface of the tray 21 and the end face of the kiln car 2. The sagger 8 is placed on the tray 21 and the tray 21 is used to support the sagger 8, so that the bottom surface of the sagger 8 is in full contact with the kiln atmosphere, thereby improving the heat exchange efficiency.

[0036] More preferably, the lower end of the cooling pipe 1 extends beyond the bottom surface of the tray 21, specifically, the lower end of the cooling pipe 1 extends beyond the bottom surface of the tray 21 by 10mm-30mm, making full use of the kiln space to extend the length of the cooling pipe 1, thereby increasing the heat absorption and thus improving the heat absorption efficiency.

[0037] More preferably, wheels 22 are provided at the bottom of the kiln car 2, and the wheels 22 are rotatably connected to the track 23 for stably transporting the sagger 8 containing materials between different processes in the kiln.

[0038] The cooling device operates as follows:

[0039] The saggers 8 carried on the kiln car 2 pass through the preheating section and heating section of the kiln in sequence. After the material in the saggers 8 is sintered at high temperature, it moves to the cooling section and is cooled by the cooling device. The liquid supply valve 31 and the circulation valve 51 at both ends of the cooling pipe 1 are opened. The cooling medium enters the cooling pipe 1 from the liquid cooling station 4 through the liquid supply pipe 3. After absorbing heat in the kiln atmosphere in the cooling pipe 1, it flows to the circulation tower 6 through the liquid discharge pipe 5 to release heat. The heat in the saggers 8 is carried away by the circulation flow. The cooling medium flow rate is controlled by controlling the opening of the valve to accurately control the cooling range and rate, so that the material can be stably formed.

[0040] Example 2

[0041] This embodiment also discloses a cooling device for an electrically heated lithium battery material tunnel kiln. The cooling pipes 1 are arranged in multiple rows in the kiln, and two or more layers can be arranged between two adjacent sets of saggers 8. The heat absorption capacity is improved by increasing the density of the cooling pipes 1.

[0042] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and any modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A cooling device for an electrically heated lithium battery material tunnel kiln, comprising a frame (7), an insulation layer (71), a track (23), multiple saggers (8), and a kiln car (2), wherein the insulation layer (71) is disposed on the inner wall of the frame (7), the track (23) is disposed at the bottom of the frame (7) along the length direction of the tunnel kiln, the kiln car (2) is rotatably connected to the track (23), and the multiple saggers (8) are spaced apart on the kiln car (2), characterized in that: It also includes a cooling pipe (1), a liquid supply pipe (3), a liquid drain pipe (5), a liquid cooling station (4), and a circulation tower (6). The end of the cooling pipe (1) is connected to the top of the frame (7). The cooling pipe (1) extends into the gap between the plurality of saggers (8). The two ends of the liquid supply pipe (3) are respectively connected to one end of the cooling pipe (1) and the liquid cooling station (4). The two ends of the liquid drain pipe (5) are respectively connected to the other end of the cooling pipe (1) and the circulation tower (6).

2. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 1, characterized in that: It also includes a sealing flange (12), both ends of the cooling pipe (1) are connected to the top of the frame (7) by the sealing flange (12).

3. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 2, characterized in that: The outer wall of the cooling pipe (1) is provided with heat exchange fins (11), which extend outward from the outer peripheral wall of the cooling pipe (1).

4. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 3, characterized in that: The heat exchange fins (11) are spirally arranged around the axis of the cooling pipe (1).

5. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 1, characterized in that: The cooling pipe (1) is configured as a U-shaped pipe.

6. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 1, characterized in that: It also includes a liquid supply valve (31) and a circulation valve (51). The liquid supply valve (31) is located between one end of the cooling pipe (1) and the liquid cooling station (4), and the circulation valve (51) is located between the other end of the cooling pipe (1) and the circulation tower (6).

7. The cooling device for an electrically heated lithium battery material tunnel kiln according to any one of claims 1-6, characterized in that: The two side walls of the kiln car (2) protrude outward to form a sealing part (74), and the two side walls of the frame (7) are provided with sealing grooves (72), and the sealing part (74) and the sealing grooves (72) are fitted together with a clearance.

8. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 7, characterized in that: It also includes a sealing groove (75), and the two side walls of the kiln car (2) extend downward to form a sealing plate (73). The sealing groove (75) is located below the kiln car (2). The sealing groove (75) is filled with a sealing medium, and the sealing plate (73) is inserted into the sealing groove (75).

9. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 1, characterized in that: It also includes a tray (21), which is placed on the kiln car (2), and the bottom surface of the tray (21) is spaced from the end face of the kiln car (2), and the sagger (8) is placed on the tray (21).

10. The cooling device for an electrically heated lithium battery material tunnel kiln according to claim 9, characterized in that: The lower end of the cooling pipe (1) extends beyond the bottom surface of the tray (21).

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