A rotary kiln for preparing silicon-carbon negative electrode material

Abstract

The application discloses a rotary kiln for preparing silicon-carbon negative electrode material, which comprises a hearth, an air inlet section, a material inlet section and a material inlet pipe. The hearth is provided with a plurality of stirring screws; the air inlet section is rotatably connected to the first end of the hearth and is provided with an air inlet and a material outlet; the material inlet section is rotatably connected to the second end of the hearth and is provided with an air outlet; the material inlet pipe comprises a material inlet main pipe and a plurality of material inlet branch pipes, the material inlet main pipe is partially arranged in the hearth, the plurality of material inlet branch pipes are connected to the part of the material inlet main pipe arranged in the hearth, and the front ends of the plurality of material inlet branch pipes are inclined downward. The rotary kiln for preparing silicon-carbon negative electrode material reduces the waiting time for stirring and the uniform heat transfer time, so that the rotary kiln for preparing silicon-carbon negative electrode material can quickly and effectively produce, and the efficiency of preparing silicon-carbon negative electrode material is improved.

Description

Technical Field

[0001] This application relates to the field of rotary kiln technology, and in particular to a rotary kiln for preparing silicon-carbon anode materials. Background Technology

[0002] Rotary kilns are widely used in the preparation of silicon-carbon anode materials. They can be used to coat porous carbon, silicon-carbon, and other powder materials on their surface through the high-temperature pyrolysis of gases such as silane and acetylene. Existing rotary kilns use a feed screw to transport the powder material to the front of the furnace. The rotating kiln chamber, with its built-in feed screw, slowly stirs and transports the material. Once the powder in the furnace is evenly stirred and churned, process gases such as silane or acetylene, along with carrier gases such as nitrogen, are introduced to carry out the coating and deposition reaction.

[0003] In existing rotary kilns, there is a long waiting time between feeding and uniform mixing during screw feeding. Furthermore, during the material conveying process by the screw, the material remains in an uneven, accumulated state for an extended period. The heat transfer of the accumulated powder is slow, further requiring time for heat preservation and waiting for the powder to reach uniform heat transfer. Therefore, existing rotary kilns experience significant waiting times during feeding, which hinder effective production. Utility Model Content

[0004] This application provides a rotary kiln for preparing silicon-carbon anode materials, which solves the technical problem of long waiting time in the feeding process of existing rotary kilns.

[0005] The rotary kiln for preparing silicon-carbon anode materials provided in this application includes: a furnace chamber having multiple stirring spirals; an air inlet section rotatably connected to a first end of the furnace chamber, the air inlet section having an air inlet and a discharge outlet; a feeding section rotatably connected to a second end of the furnace chamber, the feeding section having an air outlet; and a feeding pipe including a main feeding pipe and multiple feeding branch pipes, the main feeding pipe being located inside the furnace chamber, and the multiple feeding branch pipes being connected to the portion of the main feeding pipe located inside the furnace chamber, the front nozzles of the multiple feeding branch pipes being inclined downwards.

[0006] In one possible implementation, the plurality of stirring spirals form a plurality of receiving intervals, and the plurality of feed branches are respectively located within the plurality of receiving intervals.

[0007] In one possible implementation, the air inlet section includes a first cylinder, an air inlet flange, an air inlet pipe, and a discharge pipe; one end of the first cylinder is rotatably connected to the first end of the furnace, and the other end of the first cylinder is detachably fitted with the air inlet flange; one end of the air inlet pipe is connected to the air inlet flange and communicates with the first cylinder, and the other end of the air inlet pipe has the air inlet port; one end of the discharge pipe is communicated with the first cylinder, and the other end of the discharge pipe has a discharge port.

[0008] In one possible implementation, the feeding section includes a second cylinder, an exhaust pipe, and a feeding flange; one end of the second cylinder is rotatably connected to the second end of the furnace, and the other end of the second cylinder is detachably fitted with the feeding flange; one end of the exhaust pipe is connected to the second cylinder, and the other end of the exhaust pipe has the exhaust port; wherein the main feeding pipe is connected to the feeding flange.

[0009] In one possible implementation, the rotary kiln for preparing silicon-carbon anode materials further includes a support tube, one end of which is connected to the air inlet section, and the other end of which is connected to the end of the feed main pipe located in the furnace.

[0010] In one possible implementation, the support tube is connected to the feed main tube via a sleeve.

[0011] In one possible implementation, the rotary kiln for preparing silicon-carbon anode materials further includes two sealing elements, which are respectively installed at the connection between the furnace and the air inlet section, and at the connection between the furnace and the feed section.

[0012] This application provides a rotary kiln for preparing silicon-carbon anode materials. The kiln includes a furnace chamber, an inlet section, a feed section, and a feed pipe. The furnace chamber has multiple stirring spirals, which agitate the material within the furnace chamber as it rotates. The inlet in the inlet section is used to introduce process gases such as silane or acetylene into the furnace chamber, and the outlet in the inlet section is used to output the prepared silicon-carbon anode material. The outlet in the feed section is used to discharge exhaust gases from the production process. The feed pipe is used to simultaneously transport materials and fluidizing gas into the furnace. When transporting materials and fluidizing gas, the materials and fluidizing gas enter multiple feed branch pipes through the main feed pipe and then enter the furnace from the multiple feed branch pipes. This makes the material distribution in the furnace more uniform, avoids accumulation, and reduces the waiting time for stirring and the heat transfer uniformity time. In addition, the fluidizing gas is sprayed out from multiple feed branch pipes and blows the materials, further shortening the heat transfer uniformity time. This enables the rotary kiln for preparing silicon-carbon anode materials to carry out rapid and effective production, improving the efficiency of silicon-carbon anode material preparation. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the rotary kiln for preparing silicon-carbon anode materials provided in the embodiments of this application; Figure 2 This is a cross-sectional view of the rotary kiln for preparing silicon-carbon anode materials, provided in an embodiment of this application.

[0015] Reference numerals: 100-furnace chamber; 110-stirring spiral; 120-accommodation interval; 130-first end; 140-second end; 200-air inlet section; 210-first cylinder; 220-air inlet flange; 230-air inlet pipe; 231-air inlet; 240-discharge pipe; 241-discharge outlet; 300-feeding section; 310-second cylinder; 320-air outlet pipe; 321-air outlet; 330-feeding flange; 400-feeding pipe; 410-main feed pipe; 420-branch feed pipe; 500-support pipe; 600-sealing element. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0017] In the description of the embodiments of this application, it should be noted that the terms "upper," "lower," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and 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 this application. The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, the terms "installed," "connected," and "linked" 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0018] This application provides a rotary kiln for preparing silicon-carbon anode materials, such as... Figure 1 and Figure 2 As shown, the rotary kiln for preparing silicon-carbon anode materials includes a furnace chamber 100, an air inlet section 200, a feeding section 300, and a feeding pipe 400.

[0019] The furnace chamber 100 has multiple stirring spirals 110. When the furnace chamber 100 rotates, the multiple stirring spirals 110 can stir the material inside the furnace chamber 100, so that the material inside the furnace chamber 100 is evenly distributed.

[0020] The inlet section 200 is rotatably connected to the first end 130 of the furnace 100. The inlet section 200 is provided with an inlet 231 and a discharge port 241. The inlet 231 is used to introduce process gases such as silane or acetylene into the furnace 100, and the discharge port 241 is used to output the prepared silicon-carbon anode material.

[0021] The feeding section 300 is rotatably connected to the second end 140 of the furnace 100, and the feeding section 300 is provided with an exhaust port 321. The exhaust port 321 is used to discharge the exhaust gas in the production process.

[0022] The feed pipe 400 is used to simultaneously convey materials and fluidizing gas into the furnace 100. The feed pipe 400 includes a main feed pipe 410 and multiple feed branch pipes 420. The main feed pipe 410 is partially located inside the furnace 100, and the multiple feed branch pipes 420 are connected to the portion of the main feed pipe 410 located inside the furnace 100. The nozzles at the front ends of the multiple feed branch pipes 420 are inclined downwards. When conveying materials and fluidizing gas, the feed pipe 400 allows the materials and fluidizing gas to enter the multiple feed branch pipes 420 through the main feed pipe 410 and then enter the furnace 100 from the multiple feed branch pipes 420. This results in a more uniform distribution of materials entering the furnace 100, preventing accumulation and reducing the waiting time for stirring and the time for heat homogenization. Furthermore, the fluidizing gas is ejected from the multiple feed branch pipes 420 and blows the materials, further shortening the separate heat homogenization time. This enables the rotary kiln for preparing silicon-carbon anode materials to operate quickly and efficiently, improving the efficiency of silicon-carbon anode material preparation.

[0023] Furthermore, in the rotary kiln for preparing silicon-carbon anode materials, after the front nozzles of multiple branch pipes are buried inside the powder material accumulation, each feed branch pipe 420 introduces fluidizing gas into the accumulated powder material, realizing the two production actions of spiral tumbling and fluidization in the furnace 100, optimizing the powder fluidization and reaction efficiency in the rotary kiln furnace 100, and improving the quality and yield of deposition coating.

[0024] Continue to refer to Figure 2In this embodiment, multiple stirring spirals 110 form multiple receiving intervals 120, and multiple feed branches are respectively located within the multiple receiving intervals 120. The distribution of the multiple feed branches ensures that the material entering the furnace 100 from the multiple feed branches 420 enters the corresponding receiving interval 120, resulting in a more uniform material distribution and further saving the waiting time for uniform stirring and heat transfer.

[0025] Specifically, such as Figure 1 and Figure 2 As shown in this embodiment, the air inlet section 200 includes a first cylinder 210, an air inlet flange 220, an air inlet pipe 230, and a discharge pipe 240. One end of the first cylinder 210 is rotatably connected to the first end 130 of the furnace 100, and the other end of the first cylinder 210 is detachably fitted with the air inlet flange 220. One end of the air inlet pipe 230 is connected to the air inlet flange 220 and communicates with the first cylinder 210, and the other end of the air inlet pipe 230 has an air inlet 231. One end of the discharge pipe 240 is connected to the first cylinder 210, and the other end of the discharge pipe 240 has a discharge outlet 241.

[0026] The inlet flange 220 is used to connect the inlet pipe 230 to the first cylinder 210 and communicate with the furnace 100, and to seal the end of the first cylinder 210.

[0027] The end of the inlet pipe 230 away from the inlet flange 220 is used to connect with the gas source of the process gas. During the silicon deposition process in the rotary kiln for preparing silicon-carbon anode materials, the silicon source gas enters the furnace 100 through the inlet pipe 230 and the first cylinder 210. During the carbon coating process in the rotary kiln for preparing silicon-carbon anode materials, the carbon source gas enters the furnace 100 through the inlet pipe 230 and the first cylinder 210.

[0028] After the silicon-carbon anode material is formed in the furnace 100, the discharge pipe 240 is opened, and the silicon-carbon anode material is output from the discharge pipe 240.

[0029] Specifically, such as Figure 1 and Figure 2 As shown, the feeding section 300 includes a second cylinder 310, an exhaust pipe 320, and a feeding flange 330. One end of the second cylinder 310 is rotatably connected to the second end 140 of the furnace 100, and the other end of the second cylinder 310 is detachably fitted with the feeding flange 330. One end of the exhaust pipe 320 is connected to the second cylinder 310, and the other end of the exhaust pipe 320 has an exhaust port 321; wherein, the main feed pipe 410 is connected to the feeding flange 330.

[0030] The end of the exhaust pipe 320 furthest from the second cylinder 310 is used to connect to the exhaust gas treatment device. During the preparation of silicon-carbon anode materials, the exhaust gas enters the second cylinder 310 from the furnace 100 and enters the exhaust gas treatment device through the exhaust pipe 320.

[0031] By adjusting the installation angle of the feed flange 330, the operator can adjust the direction of the front nozzle of the feed branch pipe 420 to adapt to different process temperatures, flow rates, times, furnace rotation speeds, and feed amounts, thereby ensuring the quality of deposition and coating. For example, the front nozzle of the feed branch pipe 420 can be adjusted within a 120° range.

[0032] Furthermore, such as Figure 1 and Figure 2 As shown, the rotary kiln for preparing silicon-carbon anode materials provided in this application embodiment also includes a support pipe 500. One end of the support pipe 500 is connected to the air inlet section 200, and the other end of the support pipe 500 is connected to the end of the feed main pipe 410 located in the furnace 100.

[0033] The support tube 500 is used to support the end of the feed pipe 410 located in the furnace 100, so as to prevent the feed pipe 410 from bending excessively and interfering with the rotating furnace 100.

[0034] For example, the support tube 500 is connected to the feed tube 410 via a sleeve.

[0035] Furthermore, such as Figure 1 and Figure 2 As shown, the rotary kiln for preparing silicon-carbon anode materials also includes two sealing elements 600, which are respectively installed at the connection between the furnace 100 and the air inlet section 200, and at the connection between the furnace 100 and the feed section 300.

[0036] The two seals 600 prevent gas and powder materials from leaking out of the furnace 100, ensuring production safety and avoiding environmental pollution.

[0037] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0038] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A rotary kiln for preparing silicon-carbon anode materials, characterized in that, include: The furnace chamber has multiple stirring spirals; An air intake section is rotatably connected to the first end of the furnace chamber, and the air intake section is provided with an air inlet and a material outlet; The feeding section is rotatably connected to the second end of the furnace and is provided with an air outlet; The feed pipe includes a main feed pipe and multiple feed branch pipes. The main feed pipe is located inside the furnace, and the multiple feed branch pipes are connected to the portion of the main feed pipe located inside the furnace. The nozzles at the front ends of the multiple feed branch pipes are inclined downwards.

2. The rotary kiln for preparing silicon-carbon anode materials according to claim 1, characterized in that, The plurality of stirring spirals form a plurality of receiving intervals, and the plurality of feed branch pipes are respectively located within the plurality of receiving intervals.

3. The rotary kiln for preparing silicon-carbon anode materials according to claim 1, characterized in that, The air inlet section includes a first cylinder, an air inlet flange, an air inlet pipe, and a discharge pipe; One end of the first cylinder is rotatably connected to the first end of the furnace, and the other end of the first cylinder is detachably fitted with the air inlet flange. One end of the air intake pipe is connected to the air intake flange and communicates with the first cylinder body, and the other end of the air intake pipe has the air inlet; One end of the discharge pipe is connected to the first cylinder, and the other end of the discharge pipe has a discharge port.

4. The rotary kiln for preparing silicon-carbon anode materials according to claim 1, characterized in that, The feeding section includes a second cylinder, an air outlet pipe, and a feeding flange; One end of the second cylinder is rotatably connected to the second end of the furnace, and the other end of the second cylinder is detachably fitted with the feed flange; One end of the air outlet pipe is connected to the second cylinder, and the other end of the air outlet pipe has the air outlet. The feed pipe is connected to the feed flange.

5. The rotary kiln for preparing silicon-carbon anode materials according to claim 1, characterized in that, Also includes: A support pipe, one end of which is connected to the air inlet section, and the other end of which is connected to the end of the feed main pipe located in the furnace.

6. The rotary kiln for preparing silicon-carbon anode materials according to claim 5, characterized in that, The support tube is connected to the feed main tube via a sleeve.

7. The rotary kiln for preparing silicon-carbon anode materials according to claim 1, characterized in that, Also includes: Two seals are respectively installed at the connection between the furnace and the air inlet section, and at the connection between the furnace and the feed section.

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