Multi-section tandem type rotary kiln sintering system

Abstract

The invention relates to the technical field of battery material sintering, in particular to a multi-section tandem type rotary kiln sintering system. The multi-section tandem rotary kiln sintering system comprises a kiln body unit and a material mixing mechanism. The multiple kiln body units are sequentially arranged in series in the material conveying direction, and the multiple kiln body units are arranged in a stepped mode in the gravity direction. And each kiln body unit corresponds to different process sections of material sintering. The material mixing mechanism comprises a plurality of sets of air inlet assemblies arranged on the wall faces of the kiln body units, the air inlet assemblies communicate with the inner spaces of the kiln body units, and the air inlet assemblies are configured to introduce airflow into the kiln body units so as to blow up materials. According to the multi-section tandem rotary kiln sintering system, the distribution uniformity of materials in the kiln body units can be improved, the phenomenon of overburning or insufficient sintering time of the materials is reduced or avoided, and the comprehensive production cost is reduced while the product quality is improved.

Description

Technical Field

[0001] This invention relates to the field of battery material sintering technology, and in particular to a multi-stage series rotary kiln sintering system. Background Technology

[0002] Against the backdrop of the rapid development of the new energy vehicle industry, the high cost per kilowatt-hour of power batteries, as a core component of the industry, has become a key bottleneck restricting further development. Battery costs mainly stem from the positive and negative electrode materials, and the sintering process has a significant impact on cost control and performance optimization of these materials. Therefore, developing efficient and low-cost sintering processes has become a common goal for the industry. Rotary kiln sintering technology, with its advantages of high capacity due to continuous production, lower equipment purchase and maintenance costs, and economical energy consumption, is more competitive than traditional roller kilns and is gradually becoming a key focus of research and development for battery material sintering systems.

[0003] In existing rotary kilns, material agitation primarily relies on the kiln's rotation. This method leads to uneven material movement within the kiln, with some material accumulating while others flow rapidly through the high-temperature zone. This results in an imbalanced heat field and uneven material distribution within the kiln, causing over- or under-sintering issues that severely impact product consistency and electrochemical performance. Furthermore, materials may adhere to the kiln's inner wall, causing over-burning and affecting product consistency; in severe cases, the kiln may even burn through, increasing safety hazards.

[0004] Therefore, it is urgent to design a multi-stage series rotary kiln sintering system to solve the above technical problems. Summary of the Invention

[0005] The purpose of this invention is to propose a multi-segment series rotary kiln sintering system, which can improve the uniformity of material distribution within the kiln unit, reduce or avoid over-firing or insufficient sintering time, and improve product quality.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] This invention provides a multi-stage series rotary kiln sintering system, comprising:

[0008] The kiln body unit is configured as multiple units, which are connected in series along the material conveying direction and arranged in a stepped manner according to gravity; each kiln body unit corresponds to a different process section of material sintering.

[0009] The material mixing mechanism includes multiple sets of air inlet components disposed on the wall of each kiln unit. The air inlet components are connected to the internal space of the kiln unit and are configured to introduce airflow into the kiln unit to blow up the material.

[0010] As an optional technical solution for a multi-stage series rotary kiln sintering system, the material mixing mechanism further includes a spiral conveying and stirring component located inside the kiln unit and extending along the axial direction of the kiln unit. The spiral conveying and stirring component is fixedly connected to the inner wall of the kiln unit so as to move synchronously with the rotation of the kiln unit. The spiral blade structure of the spiral conveying and stirring component is adapted to the inner diameter of the kiln unit. The spiral conveying and stirring component is configured to stir the material and push the material to be directionally conveyed along the axial direction of the kiln unit.

[0011] As an optional technical solution for a multi-stage series rotary kiln sintering system, the material mixing mechanism further includes a vibrating wall cleaning component assembled on the outer wall of each kiln unit. The vibrating wall cleaning component is fitted to the outer wall of the kiln unit, and the action sequence of the vibrating wall cleaning component is adapted to the air supply sequence of the air intake component.

[0012] When the air intake assembly introduces airflow into the kiln unit and blows up the material, the vibrating wall cleaning component can apply vibration to the outer wall of the kiln unit to shake off the material particles adhering to the inner wall of the kiln unit.

[0013] As an optional technical solution for a multi-stage series rotary kiln sintering system, multiple sets of the air inlet components are distributed in double rows along the circumferential wall of the kiln unit, and the double rows of air inlet components are staggered along the axial direction of the kiln unit.

[0014] As an optional technical solution for a multi-stage series rotary kiln sintering system, the kiln unit includes at least a heating section kiln body, a heat preservation section kiln body, and a cooling section kiln body. Along the material conveying direction from feeding to discharging, the height of the heating section kiln body, the heat preservation section kiln body, and the cooling section kiln body decreases sequentially to form a stepped difference suitable for the gravity conveying of materials.

[0015] As an optional technical solution for a multi-stage series rotary kiln sintering system, a guide channel is provided between the feed end of the heating section kiln, between the discharge end of the heating section kiln and the feed end of the heat preservation section kiln, and between the discharge end of the heat preservation section kiln and the feed end of the cooling section kiln. The guide channel is adapted to the step difference between two adjacent kiln units, and the guide channel is used to guide the material smoothly from the previous kiln unit into the next kiln unit.

[0016] As an optional technical solution for a multi-stage series rotary kiln sintering system, the guide channel is provided with a recovery air inlet and a recovery air outlet. The multi-stage series rotary kiln sintering system also includes a recovery device, which is connected to both the recovery air inlet and the recovery air outlet. The recovery device is used to recover the material carried out with the exhaust gas.

[0017] As an optional technical solution for a multi-stage series rotary kiln sintering system, the recovery device includes a cyclone dust collector, a bag filter dust collector, and at least one cooling tower. The cyclone dust collector, the cooling tower, and the bag filter dust collector are connected in sequence. The air inlet of the cyclone dust collector is connected to the recovery air inlet, and the air outlet of the bag filter dust collector is connected to the recovery air outlet.

[0018] As an optional technical solution for a multi-stage series rotary kiln sintering system, the cooling section kiln body further includes a heat exchange layer, a cooling water inlet, and a cooling water outlet; the heat exchange layer is wrapped around the outside of the cooling section kiln body, and the cooling water inlet and cooling water outlet are respectively connected to the two ends of the heat exchange layer to form a cooling water circulation path.

[0019] As an optional technical solution for a multi-stage series rotary kiln sintering system, the multi-stage series rotary kiln sintering system also includes a material supply unit, a weighing unit, and a finished product storage unit.

[0020] The material supply unit is used to store the battery materials to be sintered;

[0021] The weighing unit is connected to the material supply unit and is used to quantitatively weigh the material; the discharge end of the weighing unit is connected to the feed end of the first kiln body unit.

[0022] The finished product storage unit is connected to the discharge end of the last kiln unit and is used to store the sintered battery materials.

[0023] The beneficial effects of the present invention include at least the following:

[0024] This invention provides a multi-stage series rotary kiln sintering system, which includes kiln units and a material mixing mechanism. Multiple kiln units are connected in series along the material conveying direction, arranged in a stepped configuration according to gravity. Each kiln unit corresponds to a different process stage in the material sintering process. The material mixing mechanism includes multiple sets of air inlet components disposed on the wall of each kiln unit. The air inlet components are connected to the internal space of the kiln unit and are configured to introduce airflow into the kiln unit to agitate the material.

[0025] The above design utilizes a multi-stage, gravity-oriented stepped kiln unit structure to divide the sintering process into different stages, including heating, holding, and cooling. Each kiln unit is independently controlled, minimizing interference between stages and reducing the risk of over-burning. The gravity-oriented stepped arrangement of the kiln units facilitates adjustment of their tilt angles, utilizing the material's gravitational potential energy to achieve smooth flow and reduce energy consumption. The air intake component in the material mixing mechanism introduces airflow into the kiln unit and agitates the material, ensuring uniform distribution and facilitating full contact between the material and the heat source. This enhances the uniformity of the thermal field, prevents localized accumulation or rapid flow of material, improves sintering consistency, and ultimately enhances the uniformity and electrochemical performance of the sintered battery materials. Simultaneously, it minimizes over-burning caused by material adhering to the inner wall of the kiln unit, reducing the risk of burn-through and improving safety. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of the present invention and these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of the multi-segment series rotary kiln sintering system provided in the embodiment of the present invention;

[0028] Figure 2 This is a schematic diagram of the structure of the heating section kiln and the recovery device provided in the embodiment of the present invention.

[0029] Figure Labels

[0030] 10. Kiln body unit; 11. Heating section kiln body; 111. Thermocouple; 12. Insulation section kiln body; 13. Cooling section kiln body; 131. Heat exchange layer; 132. Cooling water inlet; 133. Cooling water outlet;

[0031] 20. Material mixing mechanism; 21. Air intake assembly; 22. Screw conveyor agitator; 23. Vibrating wall cleaning component;

[0032] 30. Airflow guide channel; 31. Recovered air inlet; 32. Recovered air outlet;

[0033] 40. Recycling device; 41. Cyclone dust collector; 42. Baghouse dust collector; 43. Cooling tower;

[0034] 50. Material supply unit; 60. Weighing unit; 70. Finished product storage unit. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0037] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0038] In the description of this invention, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this invention is in use. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0039] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0040] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0042] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0043] This embodiment provides a multi-segment series rotary kiln sintering system, which can improve the uniformity of material distribution within the kiln unit, reduce or avoid over-firing or insufficient sintering time, and improve product quality.

[0044] like Figures 1-2 As shown, the multi-stage series rotary kiln sintering system mainly includes kiln body units 10 and material mixing mechanism 20. Multiple kiln body units 10 are configured and connected in series along the material conveying direction, forming a stepped arrangement in the direction of gravity. Each kiln body unit 10 corresponds to a different process stage in the material sintering process. The material mixing mechanism 20 includes multiple sets of air inlet components 21 disposed on the wall of each kiln body unit 10. The air inlet components 21 communicate with the internal space of the kiln body unit 10 and are configured to introduce airflow into the kiln body unit 10 to blow up the material.

[0045] Based on the above design, in this embodiment, the sintering process is divided into different stages such as heating, holding, and cooling by using multiple stepped kiln units 10 arranged in the direction of gravity. Each kiln unit 10 is independently controlled, reducing mutual interference between different stages and lowering the risk of over-burning. Furthermore, the stepped arrangement of the kiln units 10 in the direction of gravity facilitates adjustment of the tilt angle of each unit, utilizing the gravitational potential energy of the material to achieve stable flow and reduce energy consumption. The air intake component 21 in the material mixing mechanism 20 introduces airflow into the kiln unit 10 and can blow up the material, ensuring uniform material distribution. This facilitates full contact between the material and the heat source, enhances the uniformity of the thermal field, avoids localized material accumulation or rapid flow, improves the consistency of material sintering, and thus improves the uniformity and electrochemical performance of the sintered battery material. Simultaneously, it minimizes the phenomenon of over-burning caused by material adhering to the inner wall of the kiln unit 10, reducing the risk of the kiln unit 10 being burned through and improving safety.

[0046] like Figures 1-2 As shown, in this embodiment, the material mixing mechanism 20 further includes a spiral conveying agitator 22 disposed inside the kiln unit 10 and extending along the axial direction of the kiln unit 10. The spiral conveying agitator 22 is fixedly connected to the inner wall of the kiln unit 10 so as to move synchronously with the rotation of the kiln unit 10. The spiral blade structure of the spiral conveying agitator 22 is adapted to the inner diameter of the kiln unit 10. The spiral conveying agitator 22 is configured to agitate the material and push the material to be conveyed axially along the kiln unit 10.

[0047] When the spiral blade structure rotates with the kiln unit 10, it can generate dual axial and radial agitation of the material. Combined with the airflow from the air intake component 21, it forms a composite mixing mode of airflow suspension and mechanical agitation, thereby improving the uniformity of the material and avoiding dead zones where the material is not stirred. When the spiral conveyor agitator 22 rotates with the kiln unit 10, it agitates the material and pushes the material along its axial direction, further improving the uniformity of material mixing and ensuring consistent sintering results.

[0048] like Figures 1-2 As shown, in this embodiment, the material mixing mechanism 20 further includes a vibrating wall cleaning component 23 assembled on the outer wall of each kiln unit 10. The vibrating wall cleaning component 23 is fitted to the outer wall of the kiln unit 10, and the operating sequence of the vibrating wall cleaning component 23 is adapted to the air supply sequence of the air intake component 21. When the air intake component 21 introduces airflow into the kiln unit 10 to blow up the material, the vibrating wall cleaning component 23 can apply vibration to the outer wall of the kiln unit 10 to shake off the material particles adhering to the inner wall of the kiln unit 10.

[0049] Specifically, when the air intake component 21 blows up the material, some fine particles will collide with and adhere to the kiln wall. The vibrating wall cleaning component 23 transmits vibration from the outer wall to the inner wall, causing the adhered material to detach from the wall surface due to vibration and fall back to the bottom of the kiln unit 10, where it is carried away by the spiral conveyor agitator 22, thus preventing over-burning. In addition, the vibrating wall cleaning component 23 acts on the outer wall and does not need to extend into the kiln unit 10, avoiding damage caused by direct contact with high-temperature materials. At the same time, the vibration sequence is linked with the air intake component 21, which can prevent the airflow from blowing the material towards the wall surface during vibration, thus avoiding aggravating wall adhesion and improving wall cleaning efficiency.

[0050] For example, the vibrating wall cleaning component 23 can be a pneumatic vibrating hammer, with 2-3 of them arranged along the axial direction in each kiln unit 10; the pneumatic vibrating hammer is fixed on the support seat of the kiln unit 10 by a bracket, and a high-temperature resistant buffer pad, such as a ceramic fiber pad, is provided between the hammer body of the pneumatic vibrating hammer and the outer wall of the kiln unit 10 to avoid vibration damage to the kiln unit 10.

[0051] For example, by linking the control circuit of the solenoid valve and the air intake component 21, the timing logic of starting the vibration cleaning component 23 is set by delaying the air intake component 21 from the end of air supply by 1s to 3s, so as to ensure that the cleaning effect does not conflict with the mixing of materials.

[0052] In some optional embodiments, multiple sets of air intake components 21 are arranged in a double row along the circumferential wall of the kiln unit 10, and the double rows of air intake components 21 are staggered along the axial direction of the kiln unit 10.

[0053] The dual-row air intake components 21 are arranged at intervals along the circumference of the kiln unit 10, for example, one row of air intake components 21 at the top and one at the bottom. They can blow air into the kiln unit 10 from different heights to ensure that the material at the top, middle and bottom of the kiln unit 10 can be blown up by the airflow, avoiding the problem of material accumulation at the bottom when using a single-row air intake, and improving the uniformity of material mixing.

[0054] like Figure 1 As shown, in this embodiment, the kiln body unit 10 includes at least a heating section kiln body 11, a heat preservation section kiln body 12, and a cooling section kiln body 13. Along the material conveying direction from feeding to discharging, the setting height of the heating section kiln body 11, the heat preservation section kiln body 12, and the cooling section kiln body 13 decreases sequentially to form a stepped difference suitable for the gravity conveying of materials.

[0055] The heights of the heating section kiln body 11, the heat preservation section kiln body 12, and the cooling section kiln body 13 decrease sequentially, forming a natural stepped difference. Driven by the screw conveyor agitator 22, the material flows smoothly under the combined effect of gravity, eliminating the need for additional high-power conveying equipment and reducing energy consumption. Simultaneously, the stepped difference prevents backflow of material at the junctions of the kiln body units 10, ensuring a single conveying direction. The central axes of adjacent kiln body units 10 are inclined downwards at an angle of 5°-30° along the material conveying direction, and the discharge end of the preceding kiln body unit 10 is connected to the feed end of the following kiln body unit 10 by an arc-shaped transition section, ensuring smooth material flow by gravity.

[0056] like Figure 1 As shown, in this embodiment, multiple thermocouples 111 for heating the kiln body are provided on the peripheral sidewall of the heating section kiln body 11. The multiple thermocouples 111 are evenly distributed on the peripheral sidewall of the kiln body unit 10.

[0057] Specifically, guide channels 30 are provided at the feed end of the heating section kiln 11, between the discharge end of the heating section kiln 11 and the feed end of the heat preservation section kiln 12, and between the discharge end of the heat preservation section kiln 12 and the feed end of the cooling section kiln 13. The guide channels 30 are adapted to the step difference between two adjacent kiln units 10 and are used to guide the material smoothly from the previous kiln unit 10 into the next kiln unit 10.

[0058] It should be noted that the kiln body 11 in the heating section and the kiln body 12 in the heat preservation section have the same structure in this embodiment, the difference being that the heating power of the thermocouple 111 is different.

[0059] The guide channel 30 seals the connection between adjacent kiln units 10, allowing material to flow within it and preventing the diffusion of fine particles. The inner wall of the guide channel 30 is smooth and inclined, allowing material to slide smoothly down its inner wall without accumulating in gaps. The inclination angle of the guide channel 30 is adapted to the step difference, for example, a downward inclination angle of 5°-30°.

[0060] Optionally, in some alternative embodiments, a vibration cleaning component 23 may also be provided on the flow channel 30 to clean the material in the flow channel 30 and reduce or avoid the accumulation of material in the flow channel 30.

[0061] like Figures 1-2 As shown, the flow channel 30 is provided with a recovery air inlet 31 and a recovery air outlet 32. The multi-stage series rotary kiln sintering system also includes a recovery device 40, which is connected to both the recovery air inlet 31 and the recovery air outlet 32. The recovery device 40 is used to recover the material carried out with the exhaust gas.

[0062] The recovery inlet 31 captures fine material particles flowing with the airflow in the guide channel 30. The recovery device 40 separates and collects the particles, and then sends them back to the kiln unit 10 (such as the feeding end of the heating section) through the return pipe, thus avoiding material waste and reducing production costs.

[0063] Furthermore, when the air intake component 21 introduces airflow into the kiln unit 10, the recovery air intake port 31 is opened. The airflow can carry fine material particles from the recovery air intake port 31 into the recovery device 40. This ensures that the pressure of the kiln unit 10 is constant and avoids excessive pressure in the kiln unit 10 due to the airflow introduced by the air intake component 21, thereby improving the safety of the multi-stage series rotary kiln sintering system.

[0064] like Figures 1-2 As shown, in this embodiment, the recycling device 40 includes a cyclone dust collector 41, a bag dust collector 42, and at least one cooling tower 43. The cyclone dust collector 41, the cooling tower 43, and the bag dust collector 42 are connected in sequence. The air inlet of the cyclone dust collector 41 is connected to the recycling air inlet 31, and the air outlet of the bag dust collector 42 is connected to the recycling air outlet 32.

[0065] Cyclone dust collector 41 first separates large particles in the airflow to prevent them from clogging the subsequent bag dust collector 42; cooling tower 43 cools the airflow to prevent high temperature damage to bag dust collector 42; bag dust collector 42 then separates fine particles, thereby improving the recovery efficiency of fine particles.

[0066] Optionally, the cooling tower 43 in this embodiment can be configured as one or more.

[0067] like Figure 1 As shown, the cooling section kiln body 13 also includes a heat exchange layer 131, a cooling water inlet 132, and a cooling water outlet 133. The heat exchange layer 131 is wrapped around the outside of the cooling section kiln body 13. The cooling water inlet 132 and the cooling water outlet 133 are respectively connected to both ends of the heat exchange layer 131, forming a cooling water circulation path. The cooling water circulates within the heat exchange layer 131, quickly carrying away the heat of the cooling section kiln body 13 through heat conduction, reducing cooling time and significantly improving production efficiency. The heat exchange layer 131 wraps around the entire cooling section kiln body 13, and the cooling water flows evenly along the heat exchange layer 131, ensuring that the temperature of all parts of the cooling section kiln body 13 decreases synchronously, and the material is cooled uniformly.

[0068] For example, in this embodiment, the heat exchange layer 131 is a jacketed heat exchange layer, which is sleeved on the outside of the cooling section kiln body 13 and forms a closed chamber with the wall of the cooling section kiln body 13. A spiral guide plate is provided in the closed chamber to guide the cooling water to flow along the axial direction of the cooling section kiln body 13, so as to avoid uneven cooling caused by local stagnant water.

[0069] like Figures 1-2As shown, the multi-stage series rotary kiln sintering system in this embodiment also includes a material supply unit 50, a weighing unit 60, and a finished product storage unit 70. The material supply unit 50 stores the battery materials to be sintered. The weighing unit 60 is connected to the material supply unit 50 and is used for quantitative weighing of the materials; the discharge end of the weighing unit 60 is connected to the feed end of the first kiln unit 10. The finished product storage unit 70 is connected to the discharge end of the last kiln unit 10 and is used to store the sintered battery materials.

[0070] The material supply unit 50 ensures a continuous and sufficient supply of raw materials, while the weighing unit 60 performs quantitative weighing to stabilize the material load within the kiln unit 10. The finished product storage unit 70 is specifically designed to store sintered materials and can be equipped with inert gas protection, such as a nitrogen atmosphere, as needed to prevent oxidation and moisture absorption of the finished products.

[0071] In some optional embodiments, the material supply unit 50 employs a material storage silo with a stirring function. An internal agitator is installed inside the silo to prevent raw materials from clumping. A screw feeder is installed at the bottom of the silo to control the conveying speed of the material to the weighing unit 60. A dust removal port is provided at the top of the silo to prevent dust from being generated during feeding, and a lower limit sensor is installed at the bottom to indicate when to replenish material.

[0072] In some optional embodiments, the weighing unit 60 adopts a loss-in-weight quantitative weighing machine, and the discharge port of the loss-in-weight quantitative weighing machine is connected to the feed end of the heating section kiln body 11 through a sealed feed chute.

[0073] In some optional embodiments, the finished product storage unit 70 may be a finished product storage silo sealed with nitrogen. The finished product storage silo is equipped with temperature and humidity sensors inside, and a discharge valve is provided at the bottom of the finished product storage silo. The side of the finished product storage silo is equipped with an observation window and a sampling port to facilitate the detection of finished product quality. The top of the finished product storage silo is equipped with a pressure safety valve to prevent excessive nitrogen pressure.

[0074] Obviously, the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

[0075] Note that in the description of this specification, the references to terms such as "some embodiments," "other embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A multi-stage series rotary kiln sintering system, characterized in that, include: Kiln body unit (10), wherein multiple kiln body units (10) are configured, and multiple kiln body units (10) are connected in series along the material conveying direction, and multiple kiln body units (10) are arranged in a stepped manner in the direction of gravity; each kiln body unit (10) corresponds to a different process section of material sintering. The material mixing mechanism (20) includes multiple sets of air intake components (21) disposed on the wall of each kiln unit (10), the air intake components (21) communicating with the internal space of the kiln unit (10), and the air intake components (21) being configured to introduce airflow into the kiln unit (10) to blow up the material.

2. The multi-stage series rotary kiln sintering system according to claim 1, characterized in that, The material mixing mechanism (20) further includes a spiral conveying agitator (22) disposed inside the kiln unit (10) and extending along the axial direction of the kiln unit (10). The spiral conveying agitator (22) is fixedly connected to the inner wall of the kiln unit (10) so as to move synchronously with the rotation of the kiln unit (10). The spiral blade structure of the spiral conveying agitator (22) is adapted to the inner diameter of the kiln unit (10). The spiral conveying agitator (22) is configured to agitate materials and push the materials to be directionally conveyed along the axial direction of the kiln unit (10).

3. The multi-stage series rotary kiln sintering system according to claim 2, characterized in that, The material mixing mechanism (20) further includes a vibrating wall cleaning component (23) assembled on the outer wall of each kiln unit (10). The vibrating wall cleaning component (23) is fitted to the outer wall of the kiln unit (10), and the action sequence of the vibrating wall cleaning component (23) is adapted to the ventilation sequence of the air intake component (21). When the air intake assembly (21) introduces airflow into the kiln unit (10) to blow up the material, the vibrating wall cleaning component (23) can apply vibration to the outer wall of the kiln unit (10) to shake off the material particles adhering to the inner wall of the kiln unit (10).

4. The multi-stage series rotary kiln sintering system according to claim 1, characterized in that, Multiple sets of the air intake components (21) are arranged in a double row along the circumferential wall of the kiln body unit (10), and the double rows of air intake components (21) are staggered along the axial direction of the kiln body unit (10).

5. The multi-stage series rotary kiln sintering system according to claim 1, characterized in that, The kiln unit (10) includes at least a heating section kiln (11), a heat preservation section kiln (12), and a cooling section kiln (13). Along the material conveying direction from feeding to discharging, the height of the heating section kiln (11), the heat preservation section kiln (12), and the cooling section kiln (13) decreases sequentially to form a step difference suitable for the gravity conveying of materials.

6. The multi-stage series rotary kiln sintering system according to claim 5, characterized in that, A flow guide channel (30) is provided between the feed end of the heating section kiln body (11), between the discharge end of the heating section kiln body (11) and the feed end of the heat preservation section kiln body (12), and between the discharge end of the heat preservation section kiln body (12) and the feed end of the cooling section kiln body (13). The flow guide channel (30) is adapted to the step difference between two adjacent kiln body units (10). The flow guide channel (30) is used to guide the material to smoothly enter the next kiln body unit (10) from the previous kiln body unit (10).

7. The multi-stage series rotary kiln sintering system according to claim 6, characterized in that, The flow channel (30) is provided with a recovery air inlet (31) and a recovery air outlet (32). The multi-stage series rotary kiln sintering system also includes a recovery device (40). The recovery device (40) is connected to both the recovery air inlet (31) and the recovery air outlet (32). The recovery device (40) is used to recover the material carried out with the exhaust gas.

8. The multi-stage series rotary kiln sintering system according to claim 7, characterized in that, The recycling device (40) includes a cyclone dust collector (41), a bag dust collector (42), and at least one cooling tower (43). The cyclone dust collector (41), the cooling tower (43), and the bag dust collector (42) are connected in sequence. The air inlet of the cyclone dust collector (41) is connected to the recycling air inlet (31), and the air outlet of the bag dust collector (42) is connected to the recycling air outlet (32).

9. The multi-stage series rotary kiln sintering system according to claim 5, characterized in that, The cooling section kiln body (13) also includes a heat exchange layer (131), a cooling water inlet (132), and a cooling water outlet (133); the heat exchange layer (131) is wrapped around the outside of the cooling section kiln body (13), and the cooling water inlet (132) and the cooling water outlet (133) are respectively connected to the two ends of the heat exchange layer (131) to form a cooling water circulation path.

10. The multi-stage series rotary kiln sintering system according to any one of claims 1-9, characterized in that, The multi-stage series rotary kiln sintering system also includes a material supply unit (50), a weighing unit (60), and a finished product storage unit (70). The material supply unit (50) is used to store the battery materials to be sintered; The weighing unit (60) is connected to the material supply unit (50) and is used to weigh the material quantitatively; the discharge end of the weighing unit (60) is connected to the feed end of the first kiln body unit (10); The finished product storage unit (70) is connected to the discharge end of the last kiln unit (10) and is used to store the sintered battery materials.

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