Auxiliary heating structure and kiln

Abstract

The utility model discloses an auxiliary heating structure and a kiln, which belong to the technical field of kiln heating, the auxiliary heating structure comprises a furnace body and a furnace chamber arranged in the furnace body, the side wall of the furnace body is provided with an auxiliary heating device, the auxiliary heating device comprises a support member, a heating element and a diffusion chamber, the diffusion chamber is arranged on the support member, and the heating element is arranged in the furnace chamber. The diffusion cavity faces the furnace cavity, the heating element penetrates through the supporting piece to be adjustably connected into the diffusion cavity, heat sources on the two sides of the furnace body are supplemented, surrounding heating is formed in the furnace cavity, the heating uniformity is higher, and the quality of sintered battery materials is better.

Description

Technical Field

[0001] This utility model relates to the field of kiln heating technology, specifically to an auxiliary heating structure and a kiln. Background Technology

[0002] With the accelerated industrialization of lithium battery technology and the surge in demand for power batteries for new energy vehicles, lithium battery material production is showing a trend towards large-scale development. Roller kilns, as core lithium battery material sintering equipment, need to be upgraded. To increase production within limited factory space, it is necessary to widen the kiln body and increase the number of loading layers to facilitate the simultaneous sintering of battery materials, thereby achieving high-capacity production while reducing unit energy consumption.

[0003] Currently, mainstream multi-row sagger roller kilns generally suffer from uneven thermal distribution, with a negative correlation between kiln width and temperature uniformity. Typically, the temperature in the central area of ​​the kiln is higher (temperature difference can reach ±15℃), while the temperature gradient on both sides decreases significantly. This thermal distortion directly leads to unstable sintering quality of lithium battery materials, damages the consistency of the crystal phase structure of positive and negative electrode materials, and severely affects battery energy density and cycle life. For example, the vertical gradient heating scheme proposed in patent CN116678206A, although achieving temperature compensation in the height direction through heating rods of different lengths on both sides, has structural defects in its heat source layout. In this scheme, the heating elements are concentrated at the bottom and sides of the sagger, lacking effective thermal compensation in the upper area, resulting in a longitudinal stratification effect in the heat flow field. Furthermore, the direct-insertion heating rod installation method is not only difficult to maintain but also more prone to creating a "cold bridge" effect in wide-body kilns, limiting the upper limit of kiln width expansion. Another improved scheme, CN222460216U, attempts to improve the edge temperature through a flue-embedded heating structure within the kiln wall, employing a flue connection design combined with auxiliary heating element technology. While this structure can enhance the lateral flow of high-temperature gas, it has several drawbacks. First, the flue connectivity contradicts the requirements for zoned temperature control, making it difficult for multiple heating elements to achieve independent power adjustment, leading to the risk of localized overheating. Second, the concave flue structure within the kiln wall significantly weakens the mechanical strength of the kiln body. Under long-term high-temperature conditions above 1000℃, areas of structural stress concentration are prone to creep deformation, posing a safety hazard of furnace body cracking and shortening the service life of the equipment. To address these issues, an auxiliary heating structure is needed to supplement the heat inside the kiln and improve the uniformity of heating. Utility Model Content

[0004] One of the objectives of this invention is to provide an auxiliary heating structure that solves the problems of low heating efficiency and poor heating uniformity of existing heating structures for the sides of the crucible.

[0005] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0006] An auxiliary heating structure includes a furnace body and a furnace cavity provided in the furnace body. An auxiliary heating device is provided on the side wall of the furnace body. The auxiliary heating device includes a support member, a heating element, and a diffusion cavity. The diffusion cavity is provided on the support member and faces the furnace cavity. The heating element passes through the support member and is adjustably connected in the diffusion cavity, supplementing the heat sources on both sides of the furnace body, so that surrounding heating is formed in the furnace cavity, and the heating uniformity is higher, and the quality of the sintered battery material is better.

[0007] Further, the diffusion cavity is arranged in a horn shape, directing and reflecting the heat of the heating element into the furnace cavity, improving the utilization rate of heat.

[0008] Furthermore, the heating element is inserted into the support member, which is convenient for replacement and adjustment of the insertion depth during maintenance.

[0009] Preferably, the angle between the heating element and the vertical direction after insertion is A, where 0° < A < 90°, reducing the occupation of the space in the furnace cavity by the heating element and increasing the depth inserted into the furnace cavity, enhancing the input heat.

[0010] More preferably, the heating element is one of an electric heating wire or an electric heating rod, and the electric heating structure is simple and easy to maintain.

[0011] Preferably, the extension length of the lower wall of the diffusion cavity is greater than that of the upper wall, enhancing the reflected heat.

[0012] More preferably, a heat reflection layer is provided on the inner wall of the diffusion cavity, enhancing the heat reflectivity and thus improving the heating efficiency.

[0013] One of the purposes of the present utility model is to provide a kiln, which solves the problems of uneven heating and low heating efficiency after the width of the existing kiln is increased.

[0014] To achieve the above-mentioned utility model purpose, the technical solution adopted by the present utility model is as follows:

[0015] A kiln includes the above-mentioned auxiliary heating structure, an upper heating element, a lower heating element, and conveying roller rods. The auxiliary heating structure is provided on the side walls of the furnace body. The conveying roller rods are arranged at intervals along the length direction of the furnace body. The upper heating element and the lower heating element are respectively provided above and below the conveying roller rods, forming surrounding heating for the battery material in the sagger, ensuring the heating uniformity, and thus improving the sintering quality of the battery material.

[0016] Preferably, a temperature control element is further included, and the temperature control element is respectively arranged close to the upper heating element and the lower heating element to achieve accurate temperature control.

[0017] Preferably, the auxiliary heating structure is positioned above the conveying roller to shorten the heating distance and improve heating efficiency.

[0018] The beneficial effects of this utility model are as follows:

[0019] (1) The auxiliary heating structure is equipped with a detachable heating element with adjustable connection. The heating element is inserted into the support and the support is fused to the furnace wall. This can maintain the structural strength of the kiln under high temperature conditions and also realize the rapid replacement of the heating element. By adjusting the depth of the heating element inserted into the kiln, the kiln can meet the sintering use of different loading capacities, save energy, increase the single heating amount, and heat the battery material from the side to ensure the uniformity of the temperature inside the furnace.

[0020] (2) The auxiliary heating structure forms a directional diffusion heat field by combining the trumpet-shaped diffusion cavity and the inclined heating element. The heat generated by the heating element is reflected by the inclined surface of the diffusion cavity and then conducted to the center area of ​​the furnace cavity at a certain angle. This effectively compensates for the excessive temperature difference caused by heat loss on both sides of the traditional kiln. In addition, the upper and lower heating elements surround the battery material, making the temperature of the multi-layer sintering and wide-body sintering areas uniform, thus improving the quality and yield of sintered battery materials. Attached Figure Description

[0021] Figure 1 A longitudinal sectional view of the kiln provided by this utility model;

[0022] Figure 2 A cross-sectional view of the kiln provided by this utility model;

[0023] Figure 3 This is a partially enlarged view of the auxiliary heating structure provided by this utility model.

[0024] Figure label:

[0025] 1. Furnace body; 2. Furnace cavity; 3. Sagger; 4. Upper heating element; 5. Conveying roller; 6. Lower heating element; 7. Auxiliary heating device; 701. Support component; 702. Heating element; 703. Diffusion cavity; 8. Temperature control element. Detailed Implementation

[0026] 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.

[0027] Example 1

[0028] As shown Figures 1-3 in the figure, this embodiment discloses an auxiliary heating structure, which includes a furnace body 1 and a furnace cavity 2 arranged inside the furnace body 1. An auxiliary heating device 7 is provided on the side wall of the furnace body 1. The auxiliary heating device 7 includes a support member 701, a heating element 702, and a diffusion cavity 703. The diffusion cavity 703 is arranged on the support member 701 and faces the furnace cavity 2. The heating element 702 passes through the support member 701 and is adjustably connected to the diffusion cavity 703. The heating element 702 can adjust the insertion depth according to the number of crucibles 3 containing battery materials in the furnace cavity 2, so that the kiln can meet the sintering process requirements of different loading amounts, and can realize the surrounding heating of the battery materials in the crucible 3, making the crucible 3 evenly heated and the production quality of the battery materials stable.

[0029] Among them, the support member 701 is embedded in the side wall of the furnace body 1 and is made of the same refractory material as the furnace body 1, which can ensure the structural strength of the overall furnace body 1 and does not affect its service life at high temperatures.

[0030] Furthermore, the diffusion cavity 703 is arranged in a trumpet shape, and the inner wall of the diffusion cavity 703 is arranged as four connected side walls that are inclined towards the inside of the furnace cavity 2. The heat generated by the heating element 702 is reflected onto the crucible 3 through the side walls, improving the utilization rate of heat.

[0031] Furthermore, the heating element 702 is inserted onto the support member 701, which is convenient for maintenance and replacement in case of damage and easy to adjust the depth.

[0032] Even further, after the heating element 702 is inserted, the angle with the vertical direction is A, where 0° < A < 90°, that is, the heating element 702 is inclined towards the bottom of the furnace cavity 2. By inserting obliquely, the area of the heating element 702 entering the furnace cavity 2 is increased, reducing the space occupation in the width direction of the furnace cavity 2 and improving the space utilization rate of the furnace cavity 2.

[0033] Preferably, the heating element 702 is one of an electric heating wire or an electric heating rod. The electric heating method has a simple structure and is easy to install.

[0034] Furthermore, the extending length of the lower wall of the diffusion cavity 703 is greater than that of the upper wall. The heating element 702 faces the bottom of the furnace cavity 2, making the heating element 702 closer to the lower wall of the diffusion cavity 703. By extending the extending length of the lower wall, the length of the heating element 702 extending into the furnace cavity 2 is increased, and more heat is reflected towards the direction of the crucible 3. Specifically, the length of the lower wall is 1.2 times that of the upper wall.

[0035] Even further, a heat reflection layer is provided on the inner wall of the diffusion cavity 703, and the heat reflection layer is formed by attaching heat reflection paint to the inner wall of the diffusion cavity 703 to enhance the heat reflection effect and improve the utilization rate of heat.

[0036] Preferably, the outward-facing end of the heating element 702 is located within a sealed box structure, facilitating quick replacement and adjustment.

[0037] Example 2

[0038] This embodiment also discloses a kiln, including an auxiliary heating structure, an upper heating element 4, a lower heating element 6, and a conveying roller 5. The auxiliary heating structure is disposed on both side walls of the kiln body 1. The conveying roller 5 is arranged at intervals along the length of the kiln body 1. The upper heating element 4 and the lower heating element 6 are respectively disposed above and below the conveying roller 5 to form a circumferential heating of the sagger 3, ensuring the uniformity of heating of the sagger 3.

[0039] Preferably, it also includes a temperature control element 8 and a heat control board. The temperature control element 8 is respectively located close to the upper heating element 4 and the lower heating element 6. The temperature control element 8, the upper heating element 4 and the lower heating element 6 are all electrically connected to the heat control board to stabilize the temperature inside the furnace cavity 2.

[0040] Furthermore, the auxiliary heating structure is positioned above the conveying roller 5, shortening the distance to the crucible 3 and improving heating efficiency.

[0041] The working process of this kiln is as follows:

[0042] Battery materials are loaded into a sagger 3, which is then placed on a conveyor roller 5. The sagger 3 is stacked in multiple layers and columns according to the length of the furnace cavity 2 and the height above the conveyor roller 5. After stacking, the materials are conveyed to the interior by the conveyor roller 5 for heating. The upper heating element 4, the lower heating element 6, and the heating element 702 generate heat to surround and heat the sagger 3. The heating element 702 generates heat from both sides of the furnace cavity 2. The heat is transferred to the sagger 3 through thermal convection and thermal radiation. The diffuser cavity 703 concentrates the heat and reflects it onto the sagger 3, thereby increasing the heating rate of the sagger 3 and achieving uniform heating of the whole.

[0043] 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. An auxiliary heating structure, comprising a furnace body (1) and a furnace cavity (2) disposed within the furnace body (1), characterized in that: An auxiliary heating device (7) is provided on the side wall of the furnace body (1). The auxiliary heating device (7) includes a support (701), a heating element (702), and a diffusion cavity (703). The diffusion cavity (703) is disposed on the support (701) and faces the furnace cavity (2). The heating element (702) passes through the support (701) and is adjustablely connected to the diffusion cavity (703).

2. The auxiliary heating structure according to claim 1, characterized in that: The diffusion cavity (703) is configured in a trumpet shape.

3. The auxiliary heating structure according to claim 1, characterized in that: The heating element (702) is inserted into the support (701).

4. The auxiliary heating structure according to claim 3, characterized in that: The heating element (702), after being inserted, has an angle A with the vertical direction of 0°. <A<90°。 5. The auxiliary heating structure according to claim 1, characterized in that: The heating element (702) is either a heating wire or a heating rod.

6. The auxiliary heating structure according to claim 1, characterized in that: The length of the lower wall of the diffusion cavity (703) is greater than the length of the upper wall.

7. The auxiliary heating structure according to any one of claims 1-6, characterized in that: The inner wall of the diffusion cavity (703) is provided with a heat-reflective layer.

8. A kiln, characterized in that: The furnace includes an auxiliary heating structure, an upper heating element (4), a lower heating element (6), and a conveying roller (5). The auxiliary heating structure is disposed on both side walls of the furnace body (1). The conveying roller (5) is arranged at intervals along the length of the furnace body (1). The upper heating element (4) and the lower heating element (6) are respectively disposed above and below the conveying roller (5). The auxiliary heating structure is the auxiliary heating structure described in any one of claims 1-7.

9. The kiln according to claim 8, characterized in that: It also includes a temperature control element (8), which is disposed close to the upper heating element (4) and the lower heating element (6).

10. The kiln according to claim 8, characterized in that: The auxiliary heating structure is located above the conveying roller (5).

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