Split jacket type heating rotary kiln

Abstract

The utility model discloses a split jacket type heating rotary kiln, and belongs to the field of rotary kiln equipment. The rotary kiln comprises a barrel body, a kiln head driving gear and a rotary kiln driving device for driving the kiln head driving gear to act are arranged on one side of a kiln head of the barrel body, a feeding device for feeding materials into the barrel body is further arranged on one side of the kiln head, a heating jacket with a cavity is arranged on the surface of the barrel body in a sleeved mode, and the heating jacket comprises a left jacket body and a right jacket body. And a jacket driving device for driving the left jacket and the right jacket to move along the horizontal direction is arranged below the barrel. According to the utility model, the structure of the heating shell is improved, so that the shell is easy to disassemble, the barrel body cannot be moved, and the maintenance convenience is improved.

Description

Technical Field

[0001] This utility model belongs to the field of rotary kiln equipment, and more specifically, relates to a split-jacket type heated rotary kiln. Background Technology

[0002] The negative electrode material of lithium-ion batteries is one of the main factors affecting the energy density of lithium-ion batteries, typically accounting for 10% to 15% of the battery cost. An ideal lithium-ion battery should possess properties such as low potential, structural stability, small potential variation, good reversibility of lithium-ion insertion / extraction, good conductivity, good interface stability, and low interfacial AC impedance to achieve higher energy density and charge / discharge capabilities. The most crucial step in manufacturing lithium-ion battery negative electrode materials is the pre-carbonization process.

[0003] Traditional precarbonization equipment uses tunnel kilns for precarbonization. Since tunnel kilns are heated by natural gas and require graphite crucibles for loading, the crucibles dissipate a lot of heat during the heating process, resulting in energy waste.

[0004] Conventional pre-carbonization rotary kilns use external heating, which involves heating the cylinder by installing a heating shell on top of the cylinder. However, the traditional shell is divided into upper and lower shells. When maintenance is required, the upper and lower shells are lifted for maintenance, which requires moving the central cylinder as well. This makes maintenance time-consuming and too difficult.

[0005] Chinese patent application number CN202010148225.7, published on September 7, 2021, discloses an energy-saving and waste-reducing flue gas recirculation jacketed rotary kiln and its application. The rotary kiln includes a kiln head, a kiln body, a combustion chamber, and a dust settling chamber. The kiln body includes an outer kiln and an inner kiln located within the outer kiln. The combustion chamber is located at the connection between the kiln head and the outer kiln. The dust settling chamber includes a first dust settling chamber and a second dust settling chamber, which are separated from each other. The first dust settling chamber is connected to the inner kiln and is used to collect and treat the flue gas from the inner kiln. The second dust settling chamber is connected to the outer kiln and is used to collect and treat the flue gas from the outer kiln. The flue gas outlet of the first dust settling chamber is connected to the combustion chamber, which performs combustion treatment on the flue gas flowing out of the first dust settling chamber.

[0006] Chinese patent application number CN202211737284.3, published on July 2, 2024, discloses a rotary kiln, including a kiln body with a feed inlet for conveying raw materials and a waste gas outlet for discharging high-temperature waste gas; a hopper connected to the feed inlet, used to provide raw materials for production within the kiln; and a heating jacket, the peripheral walls of which together with the peripheral walls of the hopper form a heating cavity. The heating jacket also has an air inlet and an exhaust outlet connected to the heating cavity, with the air inlet connected to the waste gas outlet. The heating cavity contains a baffle plate for changing the transmission path of the high-temperature waste gas within the heating cavity, and the inner wall of the heating cavity and the baffle plate together form an airflow channel.

[0007] Both of the above solutions involve installing a heating shell outside the rotary kiln cylinder. However, the heating shell is difficult to disassemble, or, as mentioned earlier, the cylinder will be moved during disassembly, making maintenance time-consuming and difficult. Summary of the Invention

[0008] 1. The problem to be solved

[0009] To address the problems of existing rotary kiln heating shells being difficult to disassemble and causing time-consuming and laborious disassembly due to the movement of the cylinder, this utility model provides a split-jacketed rotary kiln. By improving the structure of the heating shell, the shell becomes easier to disassemble without moving the cylinder, thus improving the convenience of maintenance.

[0010] 2. Technical Solution

[0011] To solve the above problems, the present invention adopts the following technical solution.

[0012] A split-jacketed rotary kiln includes a cylinder. A kiln head drive gear and a rotary kiln drive device for driving the kiln head drive gear are installed on one side of the kiln head. A feeding device for feeding material into the cylinder is also installed on one side of the kiln head. A heating jacket with a cavity is fitted on the surface of the cylinder. The heating jacket includes a left jacket and a right jacket. A jacket drive device for driving the left jacket and the right jacket to move horizontally is installed below the cylinder.

[0013] As a further improvement to the technical solution, a base is provided below the cylinder, and a kiln head support roller is provided on the base on the kiln head side of the cylinder, and a kiln tail support roller is provided on the base on the kiln tail side of the cylinder.

[0014] As a further improvement to the technical solution, the base has a horizontally extending guide rail, and the left and right clips are slidably mounted on the guide rail.

[0015] As a further improvement to the technical solution, the jacket drive device adopts a hydraulic drive device, which includes a hydraulic station and a hydraulic cylinder. The left jacket and the right jacket are moved by a hydraulic cylinder respectively.

[0016] As a further improvement to the technical solution, the jacket drive device includes a motor and a lead screw and nut mechanism connected to the electrode drive, and the left and right jackets are fixedly connected to the nut of the lead screw and nut mechanism.

[0017] As a further improvement to the technical solution, the front and rear sections of the lead screw of the lead screw nut mechanism are respectively provided with threads in different directions, and a nut is threadedly connected to the front thread and the rear thread respectively. The left sleeve and the right sleeve are respectively fixedly connected to a nut.

[0018] As a further improvement to the technical solution, a kiln tail hood is installed on the kiln tail side of the cylinder.

[0019] As a further improvement to the technical solution, after the left and right jackets move and close, they are fastened together by bolts or snap-fit.

[0020] As a further improvement to the technical solution, the heating jacket has an air inlet and an exhaust outlet, and the air inlet is connected to the flue gas outlet of the heating furnace.

[0021] As a further improvement to the technical solution, the feeding device adopts a screw feeder.

[0022] 3. Beneficial effects

[0023] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0024] (1) This utility model is a split-jacket type heating rotary kiln. By setting the heating shell into a form where the left jacket and the right jacket are spliced ​​on the cylinder to form a complete heating jacket, when the jacket needs to be repaired, the left and right jackets can be moved to the sides without lifting the jacket and the cylinder together, making the repair convenient and quick. Furthermore, by setting the guide rail and the jacket driving device that drives the left and right jackets to move along the guide rail, the convenience of jacket disassembly and splicing is further improved.

[0025] (2) This utility model provides a split-jacket type heating rotary kiln. The selection of the jacket drive device is diverse and can be selected according to the site conditions. When a single screw is used to move the left and right jackets by setting two sections of threads with opposite directions, the synchronous reverse movement of the left and right jackets can be controlled by a single motor driving the single screw to rotate, which effectively saves installation space and equipment costs.

[0026] (3) This utility model provides a split-jacket type heating rotary kiln. By setting a kiln tail cover, the heated material can be sent to the subsequent process section after it comes out of the cylinder. At the same time, the combustible substances volatilized and released during the heating process can also be sent to the heating furnace for combustion through the top of the kiln tail cover. The flue gas from the combustion is then sent to the air inlet of the heating jacket, so as to make full use of the residual heat in the combustion process of the material. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the rotary kiln structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the heating jacket and its driving device of the present invention.

[0029] In the diagram: 1. Kiln tail hood; 2. Cylinder body; 3. Kiln tail support roller; 4. Heating jacket; 4-1. Air inlet; 4-2. Exhaust outlet; 4-3. Left jacket; 4-4. Right jacket; 4-5. Base; 4-6. Jacket drive device; 5. Kiln head support roller; 6. Kiln head drive gear; 7. Feeding device. Detailed Implementation

[0030] Exemplary embodiments of the present invention are described in detail below. While these exemplary embodiments have been described in sufficient detail to enable those skilled in the art to practice the present invention, it should be understood that other embodiments may be implemented and various changes may be made to the present invention without departing from its spirit and scope. The more detailed description of embodiments of the present invention below is not intended to limit the scope of the claimed invention, but is merely illustrative and does not limit the description of the features and characteristics of the invention, in order to provide the best mode for carrying out the invention and sufficient to enable those skilled in the art to practice it. Therefore, the scope of the present invention is defined only by the appended claims.

[0031] Example 1

[0032] A split-jacketed rotary kiln with heating features a hollow heating jacket on the outside of the kiln shell, which can heat the material inside the shell, facilitating combustion of the material in subsequent processes. Its specific structure and technical effects are described in detail below.

[0033] like Figure 1 and Figure 2As shown, the rotary kiln includes a cylinder. A kiln head drive gear and a rotary kiln drive device for driving the kiln head drive gear are mounted on one side of the cylinder. A feeding device for feeding material into the cylinder is also mounted on the kiln head side; in this embodiment, the feeding device 7 is a bolt feeder. A base is provided below the cylinder. A kiln head support roller supporting the cylinder is located on the kiln head side of the base, and a kiln tail support roller supporting the cylinder is located on the kiln tail side of the base. The kiln head drive gear 6 and the rotary kiln drive device can use existing rotary kiln drive mechanisms, which are prior art known to those skilled in the art and will not be described in detail here.

[0034] The surface of the cylinder is fitted with a heating jacket with a cavity, which includes a left jacket and a right jacket. A jacket driving device is installed below the cylinder to drive the left and right jackets to move horizontally. Specifically, the base has a horizontally extending guide rail, and the left and right jackets are slidably mounted on the guide rail.

[0035] The choice of jacket drive device is diverse and can be selected according to site conditions. One option is a hydraulic drive device, which includes a hydraulic station and cylinders. The left and right jackets are each controlled by a separate cylinder for movement. Another option is a motor and a lead screw and nut mechanism connected to the electrode drive. The lead screw in this mechanism has threads in opposite directions at its front and rear ends, each threaded with a nut. The left and right jackets are each fixedly connected to a nut. When a single lead screw moves the left and right jackets through its two opposing threaded sections, the synchronous counter-directional movement of the left and right jackets can be controlled simultaneously by a single motor driving the single lead screw, effectively saving installation space and equipment costs.

[0036] In this embodiment, the heating housing is configured such that the left jacket 4-3 and the right jacket 4-4 are spliced ​​together on the cylinder 2 to form a complete heating jacket 4. This allows for easy and quick maintenance by simply moving the left and right jackets apart when maintenance is required, without having to lift the jackets along with the cylinder. Furthermore, the ease of disassembling and assembling the jackets is further enhanced by the inclusion of guide rails and a jacket drive device 4-6 that drives the left and right jackets to move along the guide rails.

[0037] After the left and right jackets move and close, they are fastened together by bolts or clamps. During normal operation of the rotary kiln, the left and right jackets are in a pre-tightened state, with the left jacket 4-3 and right jacket 4-4 forming a single annular gap, thus creating a flue to heat the internal cylinder. When the rotary kiln requires maintenance, the left jacket 4-3 and right jacket 4-4 need to be separated for inspection. This can be done by completely disassembling or opening the clamps, and then manipulating the jacket drive device 4-6 to open and close the heated jackets, thereby achieving the purpose of maintaining the jacket space.

[0038] In this embodiment, the base 4-5 is also equipped with a pressure detection device, such as a pressure sensor, responsible for detecting the pre-tightening state of the left clamp 4-3 and the right clamp 4-4. This device is connected to the clamp drive device 4-6. When the left and right clamps are detected to be in a pre-tightening state, the clamp drive device 4-6 is interlocked and cannot be pulled apart to both sides, thereby avoiding damage to the equipment caused by the clamp drive device 4-6 forcibly pulling apart the clamps.

[0039] In addition, a kiln tail hood is installed on one side of the kiln tail of the cylinder, and the heating jacket has an air inlet and an exhaust outlet. The air inlet is connected to the flue gas outlet of the heating furnace. By setting the kiln tail hood 1, the heated material can be sent to the subsequent process section after exiting the cylinder through the kiln tail hood. At the same time, the combustible substances volatilized and released during the heating process can also be sent to the heating furnace for combustion through the top of the kiln tail hood 1.

[0040] When the rotary kiln is in operation, petroleum coke powder is fed into the inner cylinder 2 of the rotary kiln via a screw feeder. Under the action of the rotary kiln drive device 8, the material rotates inside the cylinder 2. As the rotary kiln rotates, the material gradually moves forward and eventually reaches the kiln tail hood 1, and is then sent to subsequent processing sections for use.

[0041] Meanwhile, during the heating process of the material, combustible substances are volatilized and released. The combustible substances are sent to the hot air furnace through the top of the kiln tail cover 1 for combustion and then sent to the air inlet 4-1 of the heating jacket 4. They enter the cavity inside the heating jacket 4 to heat the material, thereby achieving the purpose of heating itself with the heat generated by the combustion of the material itself. This process does not require additional fuel and can save fuel costs to the maximum extent.

[0042] In summary, the split-jacketed rotary kiln of this embodiment improves the structure of the heating shell, making the shell easy to disassemble and preventing the cylinder from moving, thus enhancing the convenience of maintenance.

Claims

1. A split jacketed heating rotary kiln comprising a cylinder (2), a kiln head drive gear (6) and a rotary kiln drive device (8) driving the kiln head drive gear (6) are arranged on the kiln head side of the cylinder (2), and a feeding device (7) feeding materials into the cylinder (2) is arranged on the kiln head side, characterized in that: The surface of the cylinder (2) is sleeved with a heating jacket (4) with a cavity, the heating jacket (4) comprises a left jacket (4-3) and a right jacket (4-4), and a jacket driving device (4-6) is arranged below the cylinder (2) to drive the left jacket (4-3) and the right jacket (4-4) to move in the horizontal direction.

2. A split jacketed heating rotary kiln as claimed in claim 1, wherein: A base (4-5) is arranged below the cylinder (2), a kiln head supporting roller (5) is arranged on the base (4-5) on the side of the kiln head of the cylinder (2), and a kiln tail supporting roller (3) is arranged on the base (4-5) on the side of the kiln tail of the cylinder (2).

3. A split jacketed heating rotary kiln as claimed in claim 2, wherein: The base (4-5) is provided with a guide rail extending in the horizontal direction, and the left jacket (4-3) and the right jacket (4-4) are slidingly installed on the guide rail.

4. A split jacketed heating rotary kiln as claimed in claim 3, wherein: The jacket driving device (4-6) is a hydraulic driving device, which comprises a hydraulic station and an oil cylinder, and the left jacket (4-3) and the right jacket (4-4) are respectively controlled to move by one oil cylinder.

5. A split jacketed heating rotary kiln as claimed in claim 3 wherein: The jacket driving device (4-6) comprises a motor and a lead screw nut mechanism in transmission connection with the electrode, and the left jacket (4-3) and the right jacket (4-4) are fixedly connected with the nut of the lead screw nut mechanism.

6. A split jacketed heating rotary kiln as claimed in claim 4, wherein: The front section and the rear section of the lead screw of the lead screw nut mechanism are respectively provided with threads in different directions, one nut is respectively screwed on the front section thread and the rear section thread, and the left jacket (4-3) and the right jacket (4-4) are respectively fixedly connected with one nut.

7. The split jacketed heating rotary kiln of claim 1, wherein: The kiln tail cover (1) is arranged on the side of the kiln tail of the cylinder (2).

8. The split shell heated rotary kiln of any one of claims 1-7, wherein: After the left jacket (4-3) and the right jacket (4-4) are moved to be closed, they are fastened by bolt connection or clamping.

9. The split shell heated rotary kiln of any one of claims 1-7, wherein: The heating jacket (4) is provided with an air inlet (4-1) and an air outlet (4-2), and the air inlet (4-1) is connected with the flue gas outlet of the heating furnace.

10. The split shell heated rotary kiln of any one of claims 1-7, wherein: The feeding device (7) is a screw feeder.

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