Rotary kiln for granulating carbon-based material

Abstract

The utility model relates to a rotary kiln for carbon-based material granulation. The rotary kiln comprises a kiln body and a power mechanism, a gear ring is arranged on the periphery of the kiln body and connected with a power gear of the power mechanism in a meshed mode, the two ends of the kiln body are rotationally connected with a feeding cover and a discharging cover respectively, a rolling device is arranged in the kiln body along the axis, and the rolling device comprises a rolling shaft. The two ends, close to the kiln body, of the rolling shaft are fixedly connected with cross-shaped supporting rods respectively, four pressing rollers are connected between the ends of the two supporting rods, the two ends of each pressing roller are rotationally connected with the supporting rods on the two sides respectively, the two ends of the rolling shaft are rotationally connected with the feeding cover and the discharging cover through bearings respectively, and one end of the rolling shaft penetrates out of the kiln body and is connected with a power mechanism. The rotary kiln for granulation can be used for carrying out rolling granulation on a carbon-based powder material containing a binder, so that the granulation strength is greatly improved.

Description

Technical Field

[0001] This utility model relates to the field of continuous granulation production technology, specifically to a rotary kiln for granulating carbon-based materials. Background Technology

[0002] Granulation is a crucial step in the production of carbon-based materials, significantly impacting their performance and quality. Traditional granulation methods primarily include reactor granulation and rotary kiln granulation.

[0003] While reaction vessel granulation equipment can achieve material mixing and granulation, its structural characteristics result in high energy consumption and low production efficiency. Reaction vessels typically operate at high temperatures and pressures, and the inability to feed or discharge materials during mixing and granulation makes large-scale continuous production difficult.

[0004] While rotary kiln granulation units solve the problem of continuous feeding and discharging and improve production efficiency, their shearing effect on materials remains insufficient. These units typically achieve material mixing and granulation through the rotation of the kiln body, but due to the lack of effective shearing and extrusion devices, the produced granules are loose and have low compaction density. Furthermore, rotary kiln granulation units are prone to material sticking to the walls during operation, leading to unstable granulation results and increased equipment maintenance costs.

[0005] In order to overcome the shortcomings of existing granulation equipment, improve the granulation quality and production efficiency of carbon-based materials, and reduce energy consumption and equipment maintenance costs, this utility model patent designs a new type of rotary kiln for carbon-based material granulation. Summary of the Invention

[0006] To address the problems in the existing technology, this utility model patent designs a rotary kiln for carbon-based material granulation, which solves the problems of high energy consumption and low production efficiency of existing reaction kettle granulation devices, and poor shearing effect of rotary kiln granulation devices on materials, resulting in loose particles and low compaction density.

[0007] The technical solution adopted by this utility model is as follows: the rotary kiln includes a kiln body and a power mechanism. A gear ring is provided on the outer periphery of the kiln body and meshes with the power gear of the power mechanism. A feed hood and a discharge hood are rotatably connected to both ends of the kiln body, respectively. A rolling device is provided along the axis inside the kiln body. The rolling device includes a roller. Both ends of the roller are rotatably connected to the feed hood and the discharge hood through bearings, respectively. One end of the roller passes through the kiln body and is connected to the power mechanism.

[0008] Furthermore, the roller is fixedly connected to cross-shaped support rods near both ends, and four pressure rollers are connected between the ends of the two support rods. The two ends of the pressure rollers are rotatably connected to the support rods on both sides.

[0009] Furthermore, the pressure roller includes a main shaft, on which four fins are welded in a cross shape along the length direction. Each fin has a pressure plate vertically welded to its top. The two ends of the main shaft are rotatably connected to a support rod.

[0010] Furthermore, the pressure plate is an arc-shaped pressure plate, with its concave side welded to the fin plate.

[0011] Furthermore, during the rotation of the rolling device, the arc-shaped pressure plates of its four pressure rollers all have a gap of 2-5cm between them and the inner wall of the kiln.

[0012] Furthermore, a front gear ring and a rear gear ring are respectively provided near both ends of the outer periphery of the kiln body. The rear gear ring is meshed with the power gear of the power mechanism, and the front gear ring is meshed with a first transmission gear. The shaft of the first transmission gear is connected to a second transmission gear through a transmission shaft. The front end of the roller passes through the kiln body from one end of the feed hood, and the end of the roller is fixedly connected to a third transmission gear. The second transmission gear is connected to the third transmission gear through a chain, which drives the rolling device to rotate.

[0013] Furthermore, the diameters of the first transmission gear, the second transmission gear, and the third transmission gear decrease sequentially.

[0014] Furthermore, the rotary kiln body is provided with three heating zones along the axial direction, and the heating temperature of the three heating zones increases sequentially.

[0015] Furthermore, the rotary kiln has an air inlet connected to an air source on the upper part of the feed hood end face, a feed inlet at the top, an air outlet at the top of the discharge hood, and a discharge outlet at the bottom.

[0016] Compared with existing technologies, the advancements of this utility model patent in the design of a rotary kiln and process for granulating carbon-based materials are as follows:

[0017] The rotary kiln adopts a design with a kiln body and a rolling device. The rolling device is driven by the kiln body through a front gear ring and multi-stage transmission gears. The rotation direction of the rolling device is opposite to that of the kiln body. At the same time, the diameter of the multi-stage transmission gears decreases in sequence, which greatly increases the rotational speed of the rolling device relative to the kiln body, and improves the mixing effect and shearing force of the rolling device on the material.

[0018] The four pressure rollers of the rolling device are equipped with cross-shaped fins and arc-shaped pressure plates. During rotation, they lift and compress the granulating material, performing both shearing and rolling granulation, which greatly improves the granulation strength. At the same time, the fins perform localized material lifting and mixing during rotation, avoiding the material being thrown high into the air like in traditional rotary kilns. This significantly reduces dust generation within the kiln, decreases the dust content in the exhaust gas, and lowers the cost of exhaust gas treatment.

[0019] The rolling device inside the rotary kiln can clean the inner wall of the kiln during its rotation relative to the kiln body, effectively preventing material from sticking to the wall during the granulation process. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of a rotary kiln used for granulation of carbon-based materials.

[0021] Figure 2 This is a schematic diagram of the connection structure between the rotary kiln body and the rolling device.

[0022] Figure 3 This is a schematic diagram of the rolling device.

[0023] Figure 4 This is a schematic diagram of the pressure roller structure.

[0024] In the figure, 1 is a rotary kiln, 2 is a rolling device, 101 is a kiln body, 102 is a feed hood, 103 is a discharge hood, 104 is a rear gear ring, 105 is a front gear ring, 106 is a rolling ring, 107 is a power mechanism, 109 is a first transmission gear, 110 is a second transmission gear ring wheel, 111 is a third transmission gear, 112 is a chain, 21 is a roller, 22 is a support rod, 23 is a pressure roller, 231 is a main shaft, 232 is a fin plate, and 233 is a pressure plate. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The technical solutions in the embodiments of the present invention will be clearly and completely described. The described embodiments are merely some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] like Figure 1 , 2 As shown in Figures 3 and 4, this utility model patent designs an embodiment of a rotary kiln for carbon-based material granulation. In this embodiment, the rotary kiln 1 includes a kiln body 101 and a power mechanism 107. The kiln body 101 has three heating zones arranged sequentially along the axial direction, with the heating temperature of the three heating zones increasing sequentially. A front gear ring 105 and a rear gear ring 104 are respectively arranged near both ends of the outer periphery, wherein the rear gear ring 104 is meshed with the power gear of the power mechanism 107. At the same time, rolling rings 106 are also arranged near both ends of the outer periphery of the kiln body 101 for support rollers to assist the rotation of the kiln body.

[0027] A feed hood 102 and a discharge hood 103 are rotatably connected to both ends of the kiln body 101, respectively. A rolling device 2 is arranged along the axis inside the kiln body 101. The rolling device 2 includes a roller 21. Both ends of the roller 21 are rotatably connected to the feed hood 102 and the discharge hood 103 through bearings, respectively. The front end of the roller 21 extends outward from the feed hood 102, and a third transmission gear 111 is fixedly connected to the end that extends outward. The part of the roller 21 located inside the kiln body 101 is fixedly connected to cross-shaped support rods 22 near both ends. Four pressure rollers 23 are connected between the four ends of the two support rods 22. The two ends of the pressure rollers 23 are rotatably connected to the support rods 22 on both sides, respectively.

[0028] A first transmission gear 109 is meshed with the front gear ring 105 of the kiln body 101 of the rotary kiln 1. A second transmission gear 110 is connected to the shaft of the first transmission gear 109 via a forward-extending horizontal transmission shaft. The second transmission gear 110 and the third transmission gear 111 are located on the same radial direction. The second transmission gear 110 is connected to the third transmission gear 111 via a chain 112, driving the rolling device 2 to rotate. At the same time, the diameters of the first transmission gear 109, the second transmission gear 110, and the third transmission gear 111 decrease sequentially, and the three sets of gear transmissions achieve a speed regulation effect.

[0029] The pressure roller 23 includes a main shaft 231, on which four fins 232 are welded in a cross shape along the length direction. Each fin 232 has an arc-shaped pressure plate 233 vertically welded to its top. The two ends of the main shaft 231 are rotatably connected to the support rods 22 on both sides. During the rotation of the rolling device 2, the arc-shaped pressure plates 233 of the four pressure rollers 23 maintain a gap of 2-5 cm with the inner wall of the kiln body 101.

[0030] Taking porous carbon, biomass carbon, activated carbon, and other carbon-based materials as examples, the specific process of the rotary kiln for granulation of the aforementioned carbon-based materials disclosed in this utility model patent is as follows:

[0031] (1) Roller granulation: The preheated carbon-based material granules and asphalt binder mixture are fed into the rotary kiln 1 through the feed port at the top of the feed hood 102. The power mechanism 107 is started to drive the kiln body 101 of the rotary kiln 1 to rotate. This drives the roller 21 of the rolling device 2 to rotate in the opposite direction to the kiln body 101 through the front gear ring 105, the first transmission gear 109, the second transmission gear 110 and the third transmission gear 111. At the same time, the roller 21 drives the support rod 22 to rotate, and the four pressure rollers 23 also rotate. During the rotation of the four pressure rollers 23, the four fins 23 of each pressure roller rotate. The 2nd stage provides lifting action for the mixture, while the 4th stage pressure plate 233 compresses the mixture. The mixture is heated to above the melting point of the asphalt binder in the first and second stage heating zones of the rotary kiln 1. Under the stirring action of the finned plate 232, the binder and carbon-based material particles are thoroughly and uniformly mixed, and then compacted by the pressure plate 233 to complete the secondary granulation. The optimal secondary granulation temperature for the mixture is around 400-450℃, and the furnace temperature is controlled at 500-550℃. The residence time of the material in the granulation stage is generally 1-4 hours, with an optimal granulation time of 2 hours. The rotation speed of the rolling device 2 is 10-40 r / min, with an optimal speed of 30 r / min.

[0032] (2) Particle roasting: The material that has completed secondary granulation continues to move forward in the rotary kiln 1 and is roasted at high temperature in the third heating zone. The furnace temperature in this zone is controlled at 650-700℃, so that the volatiles in the material are further volatilized. The material is finally discharged from the discharge port of the discharge hood 103.

[0033] (3) Protective gas: During the operation of rotary kiln 1, protective gas is input into the kiln body through the air inlet of feed hood 102. The resulting exhaust gas is discharged from the air outlet at the top of discharge hood 103 of kiln body 101 and enters the exhaust gas treatment system for purification.

[0034] The above description is merely a preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention. Any simple equivalent changes and modifications made in accordance with the claims and description of the present invention shall still fall within the scope of the present invention.

Claims

1. A rotary kiln for granulating carbon-based materials, characterized in that, The rotary kiln includes a kiln body and a power mechanism. A gear ring is installed on the outer periphery of the kiln body, meshing with the power gear of the power mechanism. A feed hood and a discharge hood are rotatably connected to both ends of the kiln body, respectively. A rolling device is installed along the axis inside the kiln body. The rolling device includes a roller, with both ends rotatably connected to the feed hood and discharge hood via bearings. One end of the roller extends out of the kiln body and is connected to the power mechanism. The roller is fixedly connected to cross-shaped support rods near both ends. Four pressure rollers are connected between the ends of the two support rods, and the two ends of the pressure rollers are rotatably connected to the support rods on both sides. The pressure roller includes a main shaft with four fins welded in a cross shape along its length. Each fin has a pressure plate vertically welded to its top. The two ends of the main shaft are rotatably connected to support rods. The pressure plate is an arc-shaped pressure plate, with its concave side welded to the fin plate.

2. The rotary kiln for granulation of carbon-based materials according to claim 1, characterized in that, During the rotation of the rolling device, a gap of 2-5cm is left between the arc-shaped pressure plates of its four pressure rollers and the inner wall of the kiln.

3. The rotary kiln for granulation of carbon-based materials according to claim 2, characterized in that, The outer periphery of the kiln body is provided with a front gear ring and a rear gear ring near both ends. The rear gear ring is meshed with the power gear of the power mechanism. The front gear ring is meshed with a first transmission gear. The shaft of the first transmission gear is connected to a second transmission gear through a transmission shaft. The front end of the roller passes through the kiln body from one end of the feed hood, and the end of the roller is fixedly connected to a third transmission gear. The second transmission gear is connected to the third transmission gear through a chain, which drives the rolling device to rotate.

4. The rotary kiln for granulation of carbon-based materials according to claim 3, characterized in that, The diameters of the first transmission gear, the second transmission gear, and the third transmission gear decrease sequentially.

5. The rotary kiln for granulation of carbon-based materials according to claim 4, characterized in that, The rotary kiln has three heating zones arranged sequentially along the axial direction, with the heating temperature of the three heating zones increasing sequentially.

6. The rotary kiln for granulation of carbon-based materials according to claim 5, characterized in that, The rotary kiln has an air inlet connected to an air source on the upper part of the feed hood end face, a feed inlet at the top, an air outlet at the top of the discharge hood, and a discharge port at the bottom.

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