Rotary efficient powder sintering equipment

Abstract

The invention relates to rotary efficient powder sintering equipment which comprises a furnace body outer wall. The rotary sintering part is arranged in the furnace body outer wall; the whole rotary sintering part is made of a heat conduction material and comprises a plurality of distributed furnace tubes which are arranged in parallel; openings are respectively formed in the front end and the rear end of the distributed furnace tube and are used as a distributed furnace tube feeding hole and a distributed furnace tube discharging hole; the rotary sintering part rotates in the material processing process; the heating part is arranged between the rotary sintering part and the outer wall of the furnace body; the feeding part comprises a feeding bin, and an air inlet and a feeding port are formed in the feeding bin; the feeding hole is used for loading materials to be processed and feeding the materials into the plurality of distributed furnace tubes; the gas inlet is used for introducing reaction gas and carrier gas into the feeding bin, and the reaction gas and the carrier gas enter the plurality of distributed furnace tubes; the discharging part comprises a discharging bin, and a tail gas outlet and a discharging opening are formed in the discharging bin.

Description

Technical Field

[0001] The present invention relates to the technical field of material processing, and particularly to a rotary high-efficiency powder sintering device. Background Art

[0002] Lithium-ion batteries are one of the most widely used rechargeable batteries today, and are used in fields such as mobile devices, electric vehicles, and energy storage systems. The negative electrode material of the battery has always been the focus of research. While traditional graphite negative electrodes meet the requirements, they face limitations in improving energy density. To overcome this limitation, researchers have turned to silicon-carbon negative electrode materials, which have a higher specific capacity and can store more lithium ions, thereby increasing the energy density of the battery. However, silicon-carbon negative electrodes also face a series of challenges, such as volume expansion, cycle stability, and preparation cost.

[0003] To overcome the technical challenges faced by silicon-carbon negative electrodes, researchers have been working on developing advanced preparation technologies and improving battery structures. In the production of silicon-carbon negative electrodes, rotary furnace technology is widely used. A rotary furnace is a high-temperature reaction device that can be used to synthesize silicon-carbon composite materials. Its structure usually includes a furnace body, a rotating system, a feeding system, and a discharging system. However, the rotary furnace may face some technical challenges in the process of preparing silicon-carbon negative electrodes, such as unstable temperature control, poor reaction uniformity, and high energy consumption. Therefore, improving the structure and control technology of the rotary furnace is an important direction of current research.

[0004] In addition, to solve the expansion problem of silicon materials in lithium-ion batteries and improve their cycle stability, the silicon-carbon negative electrode material is usually coated. Since the preparation conditions of the silicon-carbon negative electrode material are relatively harsh, it usually needs to be carried out under high temperature and inert atmosphere. However, there are some challenges in the current rotary furnace production method. During the preparation, since the overall material has relatively little contact with the coating gas during the flipping process in the furnace cavity, the coating effect is not ideal. This means that the device cannot effectively increase the contact between the material and the reaction gas, resulting in a decrease in the utilization rate of the coating gas. The inefficient coating process limits the increase in production volume and also causes waste of gas raw materials. Therefore, improving the structure and operation mode of the rotary furnace to improve the utilization rate of the coating gas, thereby improving production efficiency and coating quality, has become an issue that needs attention and solution currently. Summary of the Invention

[0005] The purpose of the present invention is to address the defects existing in the prior art and provide a rotary high-efficiency powder sintering device. By effectively increasing the contact area between gas and powder materials through the distributed furnace tubes arranged in parallel in the rotary sintering section, and using the laminar flow effect to optimize the mixing of gas flow and powder, the reaction efficiency is improved, the utilization rate of reaction gas is increased, and the energy consumption is reduced.

[0006] To achieve the above object, the present invention provides a rotary high-efficiency powder sintering device, comprising:

[0007] The outer wall of the furnace;

[0008] A rotary sintering part, disposed within the outer wall of the furnace; the entire rotary sintering part is made of a heat-conducting material and includes a plurality of distributed furnace tubes arranged in parallel; openings are respectively provided at the front and rear ends of the distributed furnace tubes as a distributed furnace tube feed port and a distributed furnace tube discharge port; the rotary sintering part rotates during the material processing;

[0009] A heating part, disposed between the rotary sintering part and the outer wall of the furnace;

[0010] A feeding part, including a feeding bin, on which an air inlet and a feeding port are provided; the feeding port is used for loading the material to be processed and feeding it into a plurality of distributed furnace tubes; the air inlet is used for introducing reaction gas and carrier gas into the feeding bin and then into the plurality of distributed furnace tubes;

[0011] A discharging part, including a discharging bin, on which a tail gas outlet and a discharging port are provided.

[0012] Preferably, during the material processing, the heating part rotates synchronously or asynchronously with the rotary sintering part, or the rotary sintering part does not rotate.

[0013] Preferably, the feeding part further includes a feeding scraper; the material to be processed is loaded into the plurality of distributed furnace tubes by the relative rotation of the feeding scraper and the rotary sintering part.

[0014] Preferably, each of the distributed furnace tubes includes a feed inlet end part, a material accommodating part, and a leak-proof end part; the lengths of the inlet end part and the leak-proof end part respectively do not exceed 10% of the total length of the distributed furnace tube;

[0015] The feed inlet end part is located on the side close to the feeding part, and a first spiral structure is provided on the inner wall of the feed inlet end part, and the spiral direction of the first spiral structure is opposite to the rotation direction of the rotary sintering part, so as to, after loading the material to be processed into the distributed furnace tube, through the rotation of the rotary sintering part, guide the material to be processed into the material accommodating part by the first spiral structure;

[0016] The material accommodating part is located in the middle section of the distributed furnace tube;

[0017] The leak-proof end part is located on the side close to the discharging part, and a second spiral structure is provided on the inner wall of the leak-proof end part, and the spiral direction of the second spiral structure is the same as the rotation direction of the rotary sintering part, so as to prevent the material in the material accommodating part from falling out from the end of the distributed furnace tube during the processing.

[0018] Further preferably, the rotational direction of the rotary sintering part during discharging is opposite to that during the material processing, so as to be opposite to the spiral direction of the second spiral structure, thereby promoting the processed material in the material accommodating part to fall out from the end of the distributed furnace tubes.

[0019] Preferably, the rotary sintering part further includes one or more heating tubes;

[0020] The heating tubes are arranged between multiple distributed furnace tubes to heat the distributed furnace tubes, so that during the material processing, under the combined action of the heating part and the heating tubes, the temperature in each distributed furnace tube is within the set process temperature range and remains consistent.

[0021] Preferably, the discharging part further includes a furnace tail baffle, which is arranged before the tail gas outlet; the furnace tail baffle is used to prevent the material blown out with the reaction gas and / or carrier gas during the material processing from being discharged with the tail gas;

[0022] The discharging part further includes a discharging scraper.

[0023] Preferably, one or more temperature measuring devices are further arranged in the heat conducting material of the rotary sintering part and / or the distributed furnace tubes to monitor the temperature during the material processing and realize temperature signal feedback.

[0024] Preferably, the rotary high-efficiency powder sintering equipment is horizontally arranged or arranged at a certain inclination angle;

[0025] The specific arrangement at a certain inclination angle is: the included angle between the distributed furnace tubes and the horizontal direction is 1° - 8°, and the end of the distributed furnace tubes close to the feeding part is higher than the end close to the discharging part.

[0026] Preferably, the radius r of the distributed furnace tubes and the radius R of the rotary sintering part satisfy 0.1R ≤ r ≤ 0.5.

[0027] The rotary high-efficiency powder sintering equipment provided by the embodiments of the present invention solves the problems existing in the existing conventional rotary furnace equipment, such as small contact area between materials and gases, uneven coating, low utilization rate of coating gases, and low temperature control accuracy. The distributed furnace tubes arranged in parallel in the rotary sintering part can effectively increase the contact area between gases and powder materials. By utilizing the laminar flow effect created by the distributed furnace tubes, the gases and materials are fully mixed, improving the "gas-solid" reaction efficiency, increasing the utilization rate of reaction gases, and reducing energy consumption. Through the design of the heat-conducting material, heating tubes, and temperature measuring device in the rotary sintering part, the temperature control is more precise, and local control with fine temperature adjustment can be achieved, resulting in better temperature consistency among the distributed furnace tubes and between the furnace tubes, which helps improve the uniformity and stability of the products. In summary, the rotary high-efficiency powder sintering equipment of the present invention has high efficiency, high temperature control accuracy, and low energy consumption, and the products prepared by it have good consistency and high stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a schematic structural diagram of the rotary high-efficiency powder sintering equipment provided by the embodiments of the present invention;

[0029] Figure 2 is a side sectional view of the rotary sintering part provided by the embodiments of the present invention;

[0030] Figure 3 is a front sectional view of the distributed furnace tube provided by the embodiments of the present invention;

[0031] Figure 4 is a side structural diagram of the feed scraper provided by the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0032] In order to make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0033] The technical solutions of the present invention will be further described in detail below through the accompanying drawings and embodiments.

[0034] The rotary high-efficiency powder sintering equipment provided by the embodiments of the present invention has the main structure as Figure 1 shown below. The technical solutions of the present invention will be described by specific embodiments in combination with Figure 1 .

[0035] The rotary high-efficiency powder sintering equipment includes: the furnace outer wall 13, the heating part 4, the rotary sintering part 9, the feeding part 3, and the discharging part 2.

[0036] The heating part 4 is arranged between the rotary sintering part 9 and the outer wall 13 of the furnace; wherein, the heating part 4 rotates synchronously or asynchronously with the rotary sintering part 9, or the rotary sintering part 9 does not rotate. In a preferred embodiment, the heating part 4 rotates synchronously with the rotary sintering part 9.

[0037] The rotary sintering part 9 is arranged within the outer wall 13 of the furnace; as Figure 2 As shown in the side sectional view of the provided rotary sintering part, the rotary sintering part 9 is entirely composed of a heat-conducting material 10 and includes a plurality of distributed furnace tubes 11 arranged in parallel; openings are respectively provided at the front and rear ends of the distributed furnace tubes 11 as a distributed furnace tube feed port and a distributed furnace tube discharge port; the rotary sintering part 9 rotates during the material processing.

[0038] In a specific solution, the radius r of the distributed furnace tube 11 and the radius R of the rotary sintering part 9 satisfy 0.1R ≤ r ≤ 0.5R. Thus, in the rotary sintering part 9, the number of the distributed furnace tubes 11 can be set to 3 - 99. Of course, in the actual equipment design, the number, diameter, spacing, etc. of the distributed furnace tubes 11 can be specifically designed according to the actual size of the sintering equipment.

[0039] Combined Figure 3 As shown, each distributed furnace tube 11 includes a feed inlet end part 111, a material accommodating part 112, and a leak-proof end part 113; the lengths of the inlet end part 111 and the leak-proof end part 113 respectively do not exceed 10% of the total length of the distributed furnace tube 11; the feed inlet end part 111 is located on the side close to the feed part 3, and a first spiral structure 114 is provided on the inner wall of the feed inlet end part 111, and the spiral direction of the first spiral structure 114 is opposite to the rotation direction of the rotary sintering part 9 (as shown by the arrow in the figure), so as to, after the material to be processed is loaded into the distributed furnace tube 11, through the rotation of the rotary sintering part 9, the material to be processed is introduced into the material accommodating part 112 by the first spiral structure 114; the material accommodating part 112 is located in the middle section of the distributed furnace tube 11; the leak-proof end part 113 is located on the side close to the discharge part 2, and a second spiral structure 115 is provided on the inner wall of the leak-proof end part 113, and the spiral direction of the second spiral structure 115 is the same as the rotation direction of the rotary sintering part 9, so as to prevent the material in the material accommodating part 112 from falling out of the end of the distributed furnace tube 11 during the processing.

[0040] The rotation direction of the rotary sintering part 9 during discharging is opposite to the rotation direction during the material processing, so as to be opposite to the spiral direction of the second spiral structure 115, thereby promoting the processed material in the material accommodating part 112 to fall out of the end of the distributed furnace tube 11.

[0041] Preferably, the rotary sintering section 9 further includes one or more heating tubes 12; the heating tubes 12 are arranged between a plurality of distributed furnace tubes 11 to heat the distributed furnace tubes 11, so that during the material processing, under the combined action of the heating section 4 and the heating tubes 12, the temperatures in each of the distributed furnace tubes 11 are within the set process temperature range and are kept consistent. At the same time, such a structural design can significantly shorten the heat diffusion path in the sintering equipment, which is beneficial to reducing heat loss.

[0042] One or more temperature measuring devices (not shown in the figure) are also arranged in the heat conducting material 10 and / or the distributed furnace tubes 11 of the rotary sintering section 9 to monitor the temperatures of various parts in the powder sintering equipment during the material processing and the heating and cooling processes. Further, the temperature signals collected by the temperature measuring devices are sent into the controller (not shown in the figure) of the rotary high-efficiency powder sintering equipment of the present invention. The data is processed by the controller to generate a feedback control signal, which can independently control the heating section 4 and the heating tubes 12 distributed at different positions, so that the temperatures in each of the distributed furnace tubes 11 and the temperatures of the heat conducting material 10 at different positions are more uniform.

[0043] An air inlet 31 and a feed inlet 32 are provided on the feed bin of the feed section 3; the feed inlet 32 is used to load the material to be processed and send it into a plurality of distributed furnace tubes 11; the air inlet 31 is used to introduce the reaction gas and the carrier gas into the feed bin and then into a plurality of distributed furnace tubes 11; the feed section 3 further includes a feed scraper 1, and the feed scraper 1 can be in a straight shape (as Figure 4 shown) or an S shape or other shapes, and the material to be processed is loaded into a plurality of distributed furnace tubes 11 by the relative rotation of the feed scraper 1 and the rotary sintering section 9.

[0044] A tail gas outlet 6 and a discharge outlet 8 are provided on the discharge bin of the discharge section 2. The discharge section 2 further includes a furnace tail baffle 7, which is arranged before the tail gas outlet 6; the furnace tail baffle 7 is used to prevent the material blown out with the reaction gas and / or the carrier gas during the material processing from being discharged along with the tail gas; the discharge section 2 further includes a discharge scraper (not shown in the figure).

[0045] The rotary high-efficiency powder sintering equipment can be horizontally arranged or arranged at a certain inclination angle; in a preferred solution, in order to facilitate the material to enter the middle section of the distributed furnace tubes 11, it can be selected that the equipment is arranged at a certain inclination angle. For example, specifically: the included angle between the distributed furnace tubes 11 and the horizontal direction is 1°-8°, and the end close to the feed section 3 is higher than the end close to the discharge section 2.

[0046] In the rotary high-efficiency powder sintering equipment of the present invention, the rotation of the heating section 4 and the rotary sintering section 9 is driven by a corresponding driving mechanism controlled by the controller, and the feed scraper 1 of the feed section 3, the furnace tail baffle 7 and the discharge scraper of the discharge section 2 are also driven by a corresponding driving mechanism controlled by the controller.

[0047] The working process of the rotary high-efficiency powder sintering equipment of the present invention will be described below with a complete process.

[0048] First, the feed inlet 32 of the rotary high-efficiency powder sintering equipment with an inclination angle of 3° to the horizontal direction is controlled to open, and the silicon-carbon composite material to be coated is filled through the feed inlet 32. During the filling process, the rotary sintering part 9 rotates clockwise, and the feed scraper 1 rotates counterclockwise, so that the silicon-carbon composite material is lifted with the rotation of the feed scraper 1 and enters the 14 distributed furnace tubes 11 in the equipment of this embodiment.

[0049] In each distributed furnace tube 11, the spiral direction of the first spiral structure 114 at the feed inlet end 111 is counterclockwise. Therefore, the silicon-carbon composite material entering the distributed furnace tube 11 is quickly introduced into the material accommodating part 112 along the first spiral structure 114 under the equipment inclination angle and the rotation of the rotary sintering part 9.

[0050] After the feeding is completed, the feed scraper 1 stops rotating, the sintering program is started, the rotary sintering part 9 and the heating part 4 rotate clockwise together, argon is introduced through the air inlet 31 and the temperature is raised. The temperature is raised to 800°C at the set heating rate.

[0051] During this process, the temperature measuring devices arranged in each distributed furnace tube 11 monitor the real-time temperature in each furnace tube, send it to the controller, and generate a feedback control signal through the controller to independently control the power of the heating tubes 12 arranged between the distributed furnace tubes 11 and the heating part 4 arranged outside the rotary sintering part 9 to ensure the temperature consistency in each distributed furnace tube 11.

[0052] When the temperature reaches the set temperature of 800°C, the controller controls the gas source, and argon and acetylene with a volume ratio of 1:1.5 are introduced through the air inlet 31, and the total gas flow rate is 5 L / min, and gas-phase deposition coating starts. The coating time is 4 hours. During this process, the temperature measuring devices monitor the real-time temperature in each furnace tube and send it to the controller, and the controller controls the power of the heating tubes 12 and the heating part 4, so as to ensure the stability and consistency of the temperature in each distributed furnace tube 11 during the process, and finally obtain the carbon-coated silicon-carbon composite material.

[0053] During the process, the airflow entering the device through the air inlet 31 forms multiple airflows with orderly directions, in layers and with uniform velocity distribution under the guidance of multiple distributed furnace tubes 11. Since the silicon-carbon composite material is dispersed into multiple distributed furnace tubes 11, the gas can more easily pass through the material layer and come into full contact with the silicon-carbon composite material in each distributed furnace tube 11, thereby improving the coating efficiency. This greatly improves the problem that in a traditional rotary sintering furnace, the material accumulates thickly and tightly, resulting in the reaction gas passing through being unable to fully and effectively contact the material.

[0054] In addition, during the process, the silicon-carbon composite material will gradually move from the feeding part 3 side to the discharging part 2 side under the action of the equipment inclination angle along with the airflow and the rotation of the rotary sintering part 9. The spiral direction of the second spiral structure 115 on the inner wall of the leakage-proof end part 113 at the tail of the distributed furnace tube 11 is the same as the rotation direction of the rotary sintering part 9, which can effectively prevent the material in the material accommodating part 112 from falling out of the end of the distributed furnace tube 11 during the processing.

[0055] After the process is completed and the temperature is lowered, control the rotary high-efficiency powder sintering equipment to a larger inclination angle and open the discharge port 8 to dump the processed material. At the same time, control the rotary sintering part 9 to rotate counterclockwise, so that the material remaining in the material accommodating part 112 can be quickly discharged along the second spiral structure 115 to minimize the material residue.

[0056] The rotary high-efficiency powder sintering equipment provided by the embodiments of the present invention solves the problems existing in the existing conventional rotary furnace equipment, such as small contact area between the material and the gas, uneven coating, low utilization rate of the coating gas, and low temperature control accuracy. The distributed furnace tubes 11 arranged in parallel in the rotary sintering part 9 can effectively increase the contact area between the gas and the powder material. By using the laminar flow effect created by the distributed furnace tubes 11, full contact between the airflow and the powder can be achieved, improving the "gas-solid" reaction efficiency, increasing the utilization rate of the reaction gas, and reducing energy consumption. Through the design of the heat-conducting material 10, heating tube 12 and temperature measuring device in the rotary sintering part 9, the temperature control is more precise, and local control with fine temperature adjustment can be realized, making the temperature consistency better among the distributed furnace tubes 11 and between the furnace tubes, which helps to improve the uniformity and stability of the product. In summary, the rotary high-efficiency powder sintering equipment of the present invention has high efficiency, high temperature control accuracy, and low energy consumption, and the products prepared by using it have good consistency and high stability.

[0057] Those skilled in the art should also be further aware that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of the two. To clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described according to functions in the above description. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present invention.

[0058] The steps of the methods or algorithms described in combination with the embodiments disclosed herein can be implemented by hardware, software modules executed by a processor, or a combination of the two. The software modules can be placed in a random access memory (RAM), internal memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium well-known in the technical field.

[0059] The specific embodiments described above have further elaborated on the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A rotary high-efficiency powder sintering device, characterized in that, The device includes: The outer wall of the furnace body; A rotary sintering part, which is arranged inside the outer wall of the furnace body; the whole rotary sintering part is made of heat-conducting materials and includes a plurality of distributed furnace tubes arranged in parallel; the front and rear ends of the distributed furnace tubes are respectively provided with openings as the distributed furnace tube feed inlet and the distributed furnace tube discharge outlet; the rotary sintering part rotates during the material processing; A heating part, which is arranged between the rotary sintering part and the outer wall of the furnace body; A feeding part, which includes a feeding bin, and an air inlet and a feeding port are arranged on the feeding bin; the feeding port is used for loading the material to be processed and feeding it into a plurality of distributed furnace tubes; the air inlet is used for introducing reaction gas and carrier gas into the feeding bin and entering the plurality of distributed furnace tubes; A discharging part, which includes a discharging bin, and a tail gas outlet and a discharging port are arranged on the discharging bin.

2. The device according to claim 1, wherein, During the material processing, the heating part rotates synchronously or asynchronously with the rotary sintering part, or the rotary sintering part does not rotate.

3. The device according to claim 1, characterized in that, The feeding part further includes a feeding scraper; the material to be processed is loaded into the plurality of distributed furnace tubes by the relative rotation of the feeding scraper and the rotary sintering part.

4. The device according to claim 1, characterized in that Each of them includes a feeding inlet end part, a material accommodating part and a leakage prevention end part; the lengths of the inlet end part and the leakage prevention end part do not exceed 10% of the total length of the distributed furnace tube respectively; The feeding inlet end part is located on the side close to the feeding part, and a first spiral structure is arranged on the inner wall of the feeding inlet end part, and the spiral direction of the first spiral structure is opposite to the rotation direction of the rotary sintering part, so as to, after loading the material to be processed into the distributed furnace tube, through the rotation of the rotary sintering part, introduce the material to be processed into the material accommodating part by the first spiral structure; The material accommodating part is located in the middle section of the distributed furnace tube; The leakage prevention end part is located on the side close to the discharging part, and a second spiral structure is arranged on the inner wall of the leakage prevention end part, and the spiral direction of the second spiral structure is the same as the rotation direction of the rotary sintering part, so as to prevent the material in the material accommodating part from falling out from the end of the distributed furnace tube during the processing.

5. The device according to claim 4, characterized in that, The rotation direction of the rotary sintering part during discharging is opposite to the rotation direction during the material processing, so as to be opposite to the spiral direction of the second spiral structure, thereby promoting the processed material in the material accommodating part to fall out from the end of the distributed furnace tube.

6. The device according to claim 1, characterized in that, The rotary sintering part further includes one or more heating tubes; The heating tubes are arranged between a plurality of distributed furnace tubes, and are used for heating the distributed furnace tubes, so that during the material processing, under the combined action of the heating part and the heating tubes, the temperatures in each distributed furnace tube are all within the set process temperature range and are kept consistent.

7. The device according to claim 1, wherein The discharging part further includes a furnace tail baffle, which is arranged before the tail gas outlet; the furnace tail baffle is used for preventing the material blown out with the reaction gas and / or carrier gas during the material processing from being discharged together with the tail gas; The discharging part further includes a discharging scraper.

8. The device according to claim 1, characterized in that, One or more temperature measuring devices are further arranged in the heat-conducting material of the rotary sintering part and / or the distributed furnace tubes, and are used for monitoring the temperature during the material processing and realizing temperature signal feedback.

9. The device according to claim 1, characterized in that, The rotary high-efficiency powder sintering equipment is horizontally arranged or arranged at a certain inclination angle; The specific arrangement at a certain inclination angle is as follows: the included angle between the distributed furnace tubes and the horizontal direction is 1°-8°, and the end of the distributed furnace tube close to the feeding part is higher than the end close to the discharging part.

10. The device according to claim 1, characterized in that, The radius r of the distributed furnace tube and the radius R of the rotary sintering part satisfy 0.1R≤r≤0.5R.

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