Rotary furnace system

Abstract

The utility model discloses a rotary furnace system which comprises a feeding device, a heating device and a cooling device, and the feeding device is used for conveying materials to the heating device; the heating device comprises a heating furnace body, the heating furnace body sequentially comprises a heating section, a constant temperature section and a cooling section in the material conveying direction, the length of the constant temperature section is larger than that of the heating section, and the length of the heating section is larger than that of the cooling section; and the cooling device is connected to the heating device and is used for cooling the materials. By controlling the lengths of the heating section, the constant temperature section and the cooling section in the heating furnace body, materials can be fully sintered in the heating furnace body, and the quality and the performance of products are ensured.

Description

Technical Field

[0001] This utility model belongs to the field of rotary kiln technology, specifically relating to a rotary kiln system. Background Technology

[0002] Due to the rapid growth of the global new energy vehicle market, the demand for various lithium battery energy storage materials has surged. Ternary materials, due to their high energy density and cycle stability, have become the mainstream choice for new energy power batteries. Especially in high-end models, ternary material batteries account for as much as 44.7%.

[0003] During the production of high-nickel ternary materials, due to their susceptibility to oxidation and agglomeration, multiple long-term segmented sintering processes are required. At the same time, continuous tumbling is necessary during the sintering process to ensure that agglomeration does not occur and that the atmosphere is uniform. This is difficult to achieve with traditional channel kilns. However, rotary kilns, through the rotation of the furnace tubes and the action of scrapers on the inner wall of the furnace tubes, enable the materials to be tumbled and mixed within the furnace tubes. Using rotary kilns can effectively solve the above problems.

[0004] Rotary furnaces achieve sintering by heating materials. In the preparation of high-nickel ternary materials, the calcination temperature affects the quality of the final product. However, current rotary furnaces still have the disadvantage of not being able to adapt well to the calcination step in the preparation process of high-nickel ternary materials, and need to be further improved.

[0005] The information disclosed in this background section is intended only to enhance the understanding of the overall background of this utility model and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a rotary kiln system whose structure can be adapted to the preparation process of high-nickel ternary materials, which helps to obtain products of excellent quality.

[0007] To achieve the above objectives, the technical solution provided by a specific embodiment of this utility model is as follows:

[0008] A rotary kiln system includes a feeding device, a heating device, and a cooling device. The feeding device is used to convey materials to the heating device. The heating device includes a heating furnace body, which includes a heating section, a constant temperature section, and a cooling section in sequence along its own material conveying direction. The length of the constant temperature section is greater than the length of the heating section, and the length of the heating section is greater than the length of the cooling section. The cooling device is connected to the heating device and is used to cool the materials.

[0009] In one or more embodiments of this utility model, the length of the constant temperature section is 3 to 5 times that of the heating section.

[0010] In one or more embodiments of this utility model, the length of the heating section is 1.5 to 2 times that of the cooling section.

[0011] In one or more embodiments of this utility model, the heating furnace body is inclined and the cooling furnace body is horizontal, and in the vertical direction, the position of the heating furnace body is higher than that of the cooling furnace body.

[0012] In one or more embodiments of this utility model, the tilt angle of the heating furnace body is 0.1° to 3°.

[0013] In one or more embodiments of the present invention, the heating furnace body includes a heating furnace shell and a heating furnace tube located in the heating furnace shell. The inner wall of the heating furnace shell is provided with an aluminum silicate fiber board and a thermocouple, and the aluminum silicate fiber board is located between the heating furnace shell and the thermocouple.

[0014] In one or more embodiments of this utility model, the heating furnace body is provided with an exhaust port, and the heating furnace body is connected to a bag filter that communicates with the exhaust port.

[0015] In one or more embodiments of this utility model, the feeding device includes a feeding bin, the feeding bin outlet is connected to a screw conveyor, the screw conveyor is connected to a vibrating conveyor, and the vibrating conveyor is connected to the heating furnace body.

[0016] In one or more embodiments of the present invention, the cooling device includes a cooling furnace body connected to the heating furnace body, the cooling furnace body including a cooling furnace shell and a cooling furnace tube, and the inner wall of the cooling furnace shell is provided with a water-cooling jacket.

[0017] In one or more embodiments of this utility model, a butterfly valve is connected to the discharge end of the heating furnace body, and the butterfly valve is connected to the feed end of the cooling furnace tube.

[0018] Compared with the prior art, this utility model controls the length of the heating section, constant temperature section and cooling section in the heating furnace body, so that the material can be fully sintered in the heating furnace body, thus ensuring the quality and performance of the product. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a front view of a rotary kiln system in one embodiment of the present invention;

[0021] Figure 2 This is a top view of a rotary kiln system in one embodiment of the present invention;

[0022] Figure 3 This is a schematic diagram of the feeding device in one embodiment of the present invention;

[0023] Figure 4 This is a schematic diagram of the heating device in one embodiment of the present invention;

[0024] Figure 5 This is a schematic diagram of the cooling device in one embodiment of the present invention.

[0025] Explanation of key figure labels:

[0026] 1. Frame; 11. First motor; 12. First sprocket; 13. Second motor; 14. Second sprocket; 2. Feeding device; 21. Feed hopper; 22. Screw conveyor; 23. Vibrating conveyor; 3. Heating device; 31. Heating furnace shell; 311. Butterfly valve; 32. Heating furnace tube; 33. Aluminum silicate fiberboard; 34. SiC thermocouple; 35. Heating section; 36. Constant temperature section; 37. Cooling section; 38. Exhaust port; 39. Bag filter; 391. Fan; 4. Cooling device; 41. Cooling furnace shell; 42. Cooling furnace tube; 43. Water-cooled jacket. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this utility model.

[0028] like Figure 1 and Figure 2 As shown, in one embodiment of the present invention, the rotary kiln system includes a frame 1, on which a feeding device 2, a heating device 3 and a cooling device 4 are sequentially arranged. The material is conveyed to the heating device 3 through the feeding device 2, where it is sintered. After sintering, it is conveyed to the cooling device 4 for cooling.

[0029] Reference Figure 3The feeding device 2 includes a feeding bin 21. A screw conveyor 22 is connected to the discharge port at the lower end of the feeding bin 21. A vibrating conveyor 23 is connected to the discharge port of the screw conveyor 22. The discharge port of the vibrating conveyor 23 is connected to the heating device 3. Using the screw conveyor 22 to transport materials reduces the probability of material blockage. Combined with the vibrating conveyor 23, it further prevents material agglomeration and caking, ensuring that the material is smoothly transported to the heating device 3.

[0030] Reference Figure 4 The heating device 3 includes a heating furnace body, which comprises a heating furnace shell 31 and a heating furnace tube 32 disposed within the heating furnace shell 31. The feed end of the heating furnace tube 32 is connected to the vibrating conveyor 23. The heating furnace body is inclined at an angle of 2°. Of course, the inclination angle can also be set to 0.1°, 1°, or 3°. The inclined setting facilitates the smooth movement of materials from the feed end to the discharge end within the heating furnace tube 32, thus completing the sintering process.

[0031] The inner wall of the heating furnace shell 31 is provided with an aluminum silicate fiber board 33 and a SiC thermocouple 34. The SiC thermocouple 34 is located inside the aluminum silicate fiber board 33 to heat the heating furnace tube 32. The aluminum silicate fiber board 33 plays a role in heat insulation and heat preservation, so that the temperature of the heating furnace tube 32 can reach the set temperature to ensure the sintering effect.

[0032] The heating furnace tube 32 is divided into a heating section 35, a constant temperature section 36, and a cooling section 37 along the material conveying direction. The length of the heating section 35 is greater than that of the cooling section 37, and the length of the constant temperature section 36 is greater than that of the heating section 35. Specifically, the length of the constant temperature section 36 is three times that of the heating section 35, and the length of the heating section 35 is twice that of the cooling section 37. The heating section 35 preheats the material to the required temperature, reducing the negative impact on material properties caused by large temperature fluctuations. The constant temperature section 36 ensures uniform heating of the material to obtain the desired product. This stage is the main stage for physical and chemical changes in the material; therefore, the maximum length of the constant temperature section 36 ensures that the material is fully processed during this stage to improve product quality. The cooling section 37 moderately cools the formed product, preventing the product from being directly conveyed to the cooling device 4 and causing changes in product shape due to a sudden temperature drop.

[0033] The frame 1 is also equipped with a first motor 11 and a first sprocket 12, which are driven by a chain. The first sprocket 12 supports the heating furnace tube 32 and drives the heating furnace tube 32 to rotate when it rotates. The heating furnace tube 32 is also equipped with spiral blades inside, which drive the material in the heating furnace tube 32 to move from the feed end to the discharge end.

[0034] Combination Figure 2 and Figure 4When the heating device 3 is in operation, it will discharge exhaust gas. Therefore, the heating furnace shell 31 is provided with an exhaust port 38. A bag filter 39 is provided on one side of the heating device 3. The bag filter 39 is connected to a fan 391 and is connected to the exhaust port 38. The exhaust gas enters the bag filter 39 through the exhaust port 38. The bag filter 39 can effectively intercept and collect dust in the exhaust gas, thereby reducing material loss and air pollution.

[0035] Reference Figure 4 and Figure 5 The cooling device 4 includes a cooling furnace body, which comprises a cooling furnace shell 41 and cooling furnace tubes 42 located inside the shell. A butterfly valve 311 is installed at the discharge end of the heating furnace tube 32, connecting the heating furnace tube 32 and the cooling furnace tube 42. A water-cooling jacket 43 is installed on the inner wall of the cooling furnace shell 41, through which cold water is sprayed onto the cooling furnace tubes 42 to achieve cooling. Furthermore, the discharged cooling water can be connected to a cooling tower or a waste heat recovery device for recycling waste heat, meeting the environmental protection requirements of energy conservation and emission reduction.

[0036] The cooling furnace body is set horizontally, and in the vertical direction, the heating furnace body is positioned higher than the cooling furnace body, so that the products sintered in the heating furnace tube 32 can be better transported to the cooling furnace tube 42. At the same time, the inclined setting of the heating furnace body further promotes the transport of products to the cooling furnace tube 42.

[0037] Combination Figure 2 and Figure 4 The frame 1 is also equipped with a second motor 13 and a second sprocket 14. The second motor 13 and the second sprocket 14 are driven by a chain. The second sprocket 14 supports the cooling furnace tube 42 and drives the cooling furnace tube 42 to rotate when it rotates. The cooling furnace tube 42 is also equipped with spiral blades inside, which drive the product in the cooling furnace tube 42 to move from the feed end to the discharge end.

[0038] In practical applications, the material in the feed hopper 21 is conveyed to the heating furnace tube 32 by the screw conveyor 22 and the vibrating conveyor 23. The heating furnace tube 32 heats and sinters the material, causing the material to change and form the desired product. The product then enters the cooling furnace tube 42 through the butterfly valve 311 for cooling. After cooling, the final product is discharged.

[0039] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0040] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A rotary kiln system, characterized in that, The device includes a feeding device, a heating device, and a cooling device. The feeding device is used to convey materials to the heating device. The heating device includes a heating furnace body, which includes a heating section, a constant temperature section, and a cooling section in sequence along the material conveying direction. The length of the constant temperature section is greater than the length of the heating section, and the length of the heating section is greater than the length of the cooling section. The cooling device is connected to the heating device and is used to cool the materials.

2. The rotary kiln system according to claim 1, characterized in that, The length of the constant temperature section is 3 to 5 times that of the heating section.

3. The rotary kiln system according to claim 1, characterized in that, The length of the heating section is 1.5 to 2 times that of the cooling section.

4. The rotary kiln system according to claim 1, characterized in that, The heating furnace body is inclined, and the cooling device is horizontally arranged. In the vertical direction, the heating furnace body is positioned higher than the cooling device.

5. The rotary kiln system according to claim 4, characterized in that, The tilt angle of the heating furnace body is 0.1°~3°.

6. The rotary kiln system according to claim 1, characterized in that, The heating furnace body includes a heating furnace shell and a heating furnace tube located in the heating furnace shell. The inner wall of the heating furnace shell is provided with an aluminum silicate fiber board and a thermocouple, and the aluminum silicate fiber board is located between the heating furnace shell and the thermocouple.

7. The rotary kiln system according to claim 1, characterized in that, The heating furnace body is provided with an exhaust port, and the heating furnace body is connected to a bag filter that communicates with the exhaust port.

8. The rotary kiln system according to claim 1, characterized in that, The feeding device includes a feeding hopper, the outlet of which is connected to a screw conveyor, the screw conveyor is connected to a vibrating conveyor, and the vibrating conveyor is connected to the heating furnace body.

9. The rotary kiln system according to claim 1, characterized in that, The cooling device includes a cooling furnace body connected to the heating furnace body. The cooling furnace body includes a cooling furnace shell and a cooling furnace tube. The inner wall of the cooling furnace shell is provided with a water-cooled jacket.

10. The rotary kiln system according to claim 9, characterized in that, The discharge end of the heating furnace body is connected to a butterfly valve, which is connected to the feed end of the cooling furnace tube.

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