Fluidized bed reactor for coating silicon-carbon negative electrode material

Abstract

The utility model relates to fluidized bed reactor for silicon carbon negative material coating, including filter structure, set up in the reaction kettle, its air inlet end communicates with the reaction kettle, and the air outlet end communicates with the air inlet end of exhaust pipe, filter plate, rotationally set up in the air inlet end of filter structure, is used for intercepting carbon silicon particles in tail gas, guide pipe, one end of guide pipe towards filter plate is connected with scraper, and the other end extends to the bottom of reaction kettle, and the scraper is in the surface of filter plate. In the utility model, when the filter structure is set up, the filter plate can make carbon source gas flow, and the silicon carbon particles are blocked, so that the silicon carbon particles escape is prevented, the silicon carbon particles are avoided waste, and the adverse effect of subsequent pipeline is caused.

Description

Technical Field

[0001] This utility model relates to the field of fluidized bed reactor technology, and in particular to a fluidized bed reactor for coating silicon-carbon anode materials. Background Technology

[0002] A fluidized bed reactor for coating silicon-carbon anode materials is a device used to uniformly coat the surface of silicon-carbon anode materials with a carbon layer. In the fluidized bed reactor, silicon-carbon particles are suspended under the action of an airflow, forming a dynamic mixing system. A carbon source gas is introduced and decomposed at high temperature, causing carbon atoms to be uniformly deposited on the surface of the silicon-carbon particles, forming a core-shell structure or a porous carbon coating layer. However, fluidized bed reactors used in existing technologies generally suffer from the following problems: During the reaction, unreacted carbon source gas and pyrolysis byproducts need to be continuously discharged from the reactor. Because silicon-carbon anode particles are small in size and light in weight, they are easily carried by the high-speed exhaust gas flow and discharged from the reactor along with the tail gas. This not only causes direct waste of silicon-carbon particulate raw materials, but also easily leads to blockage of subsequent tail gas pipelines and filtration equipment.

[0003] In summary, when using fluidized bed reactors in existing technologies, the small particle size and light weight of silicon-carbon anode particles make them easily carried away by the high-speed exhaust gas flow and discharged from the reactor along with the tail gas. This not only results in direct waste of silicon-carbon particulate raw materials but also easily leads to blockage of subsequent tail gas pipelines and filtration equipment. Based on this, we propose a fluidized bed reactor for coating silicon-carbon anode materials. Utility Model Content

[0004] (a) Technical problems to be solved In view of the above-mentioned shortcomings and deficiencies of the prior art, this utility model provides a fluidized bed reactor for coating silicon-carbon anode materials, which solves the technical problem that in existing fluidized bed reactors, due to the small particle size and light weight of silicon-carbon anode particles, they are easily carried by the high-speed flow of exhaust gas and discharged from the reactor along with the exhaust gas, resulting in resource waste.

[0005] (II) Technical Solution To achieve the above objectives, the main technical solutions adopted by this utility model include: This utility model provides a fluidized bed reactor for coating silicon-carbon anode materials.

[0006] The fluidized bed reactor for coating silicon-carbon anode material proposed in this embodiment includes a reaction vessel, with an exhaust pipe fixedly connected to the center of the upper end of the reaction vessel. Its distinguishing feature is that it further includes: The filter structure is installed inside the reactor, with its inlet end connected to the reactor and its outlet end connected to the inlet end of the exhaust pipe. The filter plate is rotatably mounted at the air inlet of the filter structure to intercept carbon and silicon particles in the exhaust gas. The guide tube has a scraper connected to one end facing the filter plate, and the other end extends to the bottom of the reactor, with the scraper pressing against the surface of the filter plate.

[0007] Optionally, the filter structure includes: The connecting pipe is installed horizontally inside the reactor. Both ends of the connecting pipe are open and connected to the filter plate. The middle part of the connecting pipe is connected to the air inlet of the exhaust pipe.

[0008] Optionally, a rotating rod is concentrically arranged inside the connecting pipe, and the rotating rod is fixedly connected to the two filter plates; A motor is fixed on the outer wall of the reactor, and the output end of the motor is coaxially and fixedly connected to the rotating rod.

[0009] Optionally, a sliding tube is slidably connected to the inside of the guide tube facing the filter plate along its axial direction, and a notch is formed on the outer circumferential surface of the sliding tube along its axial direction. A scraper is disposed at the notch on the outer circumferential surface of the sliding tube.

[0010] Optionally, the slide tubes are inclined inside the reactor, with an angle between them and the horizontal plane ranging from - degrees.

[0011] Optionally, a fixing plate is fixed to the outer circumferential surface of the guide tube; A sleeve is fixedly connected to one end of the slide tube facing the guide tube, and the sleeve is slidably sleeved on the outside of the fixed plate. A round rod is connected to one end of the sleeve facing the slide tube. Several triangular blocks are evenly distributed in a ring on the circumference of the filter plate. During the rotation of the filter plate, the triangular blocks intermittently squeeze the round rod. A spring is fitted around the outside of the slide tube, with the two ends of the spring connected to the sleeve and the fixed plate, respectively.

[0012] Optionally, both the fixing plate and the sleeve have a regular hexagonal cross-section.

[0013] Optionally, a stop is fixed to the inner wall of the sleeve, and a fixing plate is located between the stop and the spring.

[0014] Optionally, the inner wall of the reactor is equipped with a heating structure; The heating structure includes a heat exchange tube fixedly connected to the reactor, and several heat-conducting rings are distributed on the outer wall of the heat exchange tube; Temperature sensors are installed on the inner wall of the reactor.

[0015] Optionally, a number of connecting rods are fixedly mounted on the circumference of the rotating rod, and an arc-shaped plate is fixedly mounted on one end of each connecting rod.

[0016] (III) Beneficial Effects The beneficial effects of this invention are as follows: When coating silicon-carbon anode materials, the filter plate allows the carbon source gas to flow while blocking silicon-carbon particles, thus preventing the escape of silicon-carbon particles, avoiding waste of silicon-carbon particles, and preventing adverse effects on subsequent pipelines. When the silicon-carbon particles attached to the filter plate surface come into contact with the scraper, the scraper can scrape off the silicon-carbon particles, which will fall into the sliding tube due to gravity, and finally slide down from the inner circumference of the reactor through the guide tube, facilitating subsequent processing of the silicon-carbon particles. By setting up a heating structure and connecting the heat exchange tube to an external heat source, the heat exchange tube and the heat conduction ring can heat the inside of the reactor, and the temperature inside the reactor can be monitored in real time by a temperature sensor, improving the stability of the reaction. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the fluidized bed reactor for coating the entire silicon-carbon anode material according to this utility model; Figure 2 This is a schematic cross-sectional view of the reactor of this utility model; Figure 3 This is a schematic diagram of the structure of the connecting pipe of this utility model; Figure 4 This is a partial cross-sectional structural diagram of the guide tube of this utility model.

[0018] [Explanation of Labels in the Attached Image] 1. Reactor; 2. Inlet pipe; 3. Distribution plate; 4. Exhaust pipe; 5-Filter structure; 501-Connecting pipe, 502-Filter plate, 503-Rotating rod, 504-Guide pipe, 505-Sliding pipe, 506-Scraper, 507-Triangular block, 508-Fixing plate, 509-Sleeve, 510-Round rod, 511-Spring, 512-Stop block, 513-Motor; 6- Heating structure; 61-Heat exchange tube, 62-Heat conduction ring, 63-Connecting rod, 64-Arc plate, 65-Temperature sensor; 7-Infeed pipe, 8-Discharge pipe. Detailed Implementation

[0019] To better explain and facilitate understanding of this utility model, a detailed description of its specific embodiments is provided below with reference to the accompanying drawings. In this document, directional terms such as "upper," "lower," etc., are used interchangeably with other directional terms. Figure 1 The orientation is used as a reference.

[0020] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0021] like Figures 1 to 4 As shown, this embodiment proposes a fluidized bed reactor for coating silicon-carbon anode materials, including a reactor 1. The reactor 1 serves as the core container for the reaction and is made of stainless steel, titanium alloy, or quartz glass, possessing high temperature resistance, corrosion resistance, and structural strength. An inlet pipe 2 is connected to the bottom of the reactor 1, which is used to introduce carbon source gas (such as methane, acetylene, etc.) into the reactor 1. A distribution plate 3 is fixedly assembled inside the reactor 1 and directly opposite the outlet of the inlet pipe 2, with uniformly distributed guide holes on its surface. After the carbon source gas enters through the inlet pipe 2, it is dispersed into multiple fine airflows through the guide holes of the distribution plate 3, avoiding local particle aggregation caused by the impact of a single airflow and ensuring that the silicon-carbon particles are uniformly suspended under the action of the airflow.

[0022] An exhaust pipe 4 is fixedly connected to the center of the upper end of the reactor 1 to promptly discharge the exhaust gases (such as hydrogen, unreacted carbon source gases, etc.) generated after the reaction, preventing the exhaust gases from accumulating in the reactor 1 and affecting the reaction efficiency. The outlet end of the exhaust pipe 4 can be further connected to an exhaust gas treatment system (such as a combustion device or adsorption tower) to achieve environmentally friendly emissions.

[0023] The upper side wall of reactor 1 is connected to a feed pipe 7, the upper end of which can be connected to a hopper or screw feeder to achieve quantitative and continuous feeding of silicon carbide particles. A gate valve or butterfly valve is installed on the feed pipe 7 to control the feeding rate and adapt to different reaction scales. The lower side wall of reactor 1 is connected to a discharge pipe 8, which is also equipped with a control valve (such as a star-shaped discharge valve) to prevent outside air from entering reactor 1 during discharge, and to ensure the stable discharge of the coated silicon carbide material, facilitating subsequent collection and processing.

[0024] The filter structure 5 is located at the connection between the exhaust pipe 4 and the reactor 1. It is used to intercept silicon-carbon particles in the exhaust gas to prevent particles from escaping and being wasted, as well as to prevent pipe blockage. At the same time, the intercepted particles are returned to the reactor 1 to continue the reaction. The specific structure is as follows: The connecting pipe 501 is installed horizontally inside the reactor 1. Both ends of the connecting pipe 501 are open and connected to the filter plate 502. The middle part of the connecting pipe 501 is connected to the air inlet of the exhaust pipe 4. The connecting pipe 501 forms a transition channel between the exhaust pipe 4 and the reactor 1. Its inner diameter is the same as that of the exhaust pipe 4 to ensure smooth flow of exhaust gas.

[0025] Two filter plates 502 are provided, which are rotatably connected to the two ends of the connecting pipe 501 via bearings, allowing exhaust gas to pass through but intercepting silicon carbon particles.

[0026] The rotating rod 503 is a horizontally set metal rod. One end is rotatably connected to the inner wall of the reactor 1 through a bearing, and the other end is coaxially fixed to the filter plate 502 (the two filter plates 502 rotate synchronously through the rotating rod 503). A motor 513 is fixed on the outer wall of the reactor 1. The output end of the motor 513 is coaxially fixedly connected to the rotating rod 503. The motor 513 drives the rotating rod 503 to drive the filter plate 502 to rotate slowly, so as to avoid the local accumulation of particles on the surface of the filter plate 502.

[0027] The guide tube 504 is an inclined metal tube (at an angle of 30-60 degrees to the horizontal plane). One end is fixedly mounted to the inner wall of the reactor 1, and the other end extends downwards towards the center of the reactor 1 to guide the scraped particles back to the reaction area. A scraper 506 is connected to the end of the guide tube 504 facing the filter plate 502, and the free end of the scraper 506 is in close contact with the surface of the filter plate 502. When the filter plate 502 rotates, the scraper 506 continuously scrapes off the silicon-carbon particles attached to the surface of the filter plate 502. The particles fall into the guide tube 504 under the action of gravity, and then slide back to the bottom of the reactor 1 through the guide tube 504 to re-participate in the suspension and coating reaction.

[0028] Of course, in a preferred embodiment, a slide tube 505 is slidably connected to the inside of the guide tube 504 facing the filter plate 502 along its axial direction. A notch is formed on the outer circumferential surface of the slide tube 505 along its axial direction. The scraper 506 is disposed at the notch on the outer circumferential surface of the slide tube 505. The purpose of setting the slide tube 505 is to prevent silicon carbon particles from forming a blockage inside the slide tube 505 and being unable to be discharged smoothly.

[0029] To achieve the above objectives, in this embodiment, a fixing plate 508 is fixed to the outer circumferential surface of the guide tube 504; a sleeve 509 is fixedly sleeved at one end of the slide tube 505 facing the guide tube 504, and the sleeve 509 is slidably sleeved on the outside of the fixing plate 508; a round rod 510 is connected to one end of the sleeve 509 facing the slide tube 505; 4-6 triangular blocks 507 are evenly distributed in a ring on the circumferential surface of the filter plate 502; during the rotation of the filter plate 502, the triangular blocks 507 intermittently squeeze the round rod 510; a spring 511 is sleeved on the outside of the slide tube 505, and the two ends of the spring 511 are connected to the sleeve 509 and the fixing plate 508 respectively.

[0030] When the filter plate 502 drives the triangular block 507 to rotate, the inclined surface of the triangular block 507 presses against the round rod 510, pushing the sleeve 509 to slide along the fixed plate 508 and compressing the spring 511; when the triangular block 507 disengages from the round rod 510, the spring 511 resets and pushes the sleeve 509 to slide in the opposite direction, thereby driving the slide tube 505 to vibrate back and forth, causing the particles to slide down quickly and avoiding blockage.

[0031] Furthermore, both the fixed plate 508 and the sleeve 509 have a regular hexagonal cross-section. The regular hexagonal structure can restrict the rotation of the sleeve 509, ensuring that the scraper 506 always adheres to the filter plate 502.

[0032] To prevent the slide tube 505 from excessively impacting the rotating rod 503 due to the spring 511 returning to its original position, a stop block 512 is fixed to the inner wall of the sleeve 509, and a fixing plate 508 is located between the stop block 512 and the spring 511. When the spring 511 extends and causes the sleeve 509 to slide until the stop block 512 abuts against the fixing plate 508, the sleeve 509 stops sliding, effectively protecting the slide tube 505 and the rotating rod 503.

[0033] Optionally, the inner wall of the reactor 1 is provided with a heating structure 6 for precise temperature control within the reactor 1, ensuring stable pyrolysis of the carbon source gas at high temperatures and deposition on the surface of silicon-carbon particles. The specific structure is as follows: The heating structure 6 includes a heat exchange tube 61 fixedly connected to the reactor 1. The heat exchange tube 61 is a metal coil, fixedly attached to the inner wall of the reactor 1, with both ends extending out of the reactor 1 and connected to an external heat exchange medium supply system (such as a high-temperature steam boiler, thermal oil heater, or molten salt storage tank). Heat transfer is achieved through the circulation of the heat exchange medium. The heat-conducting ring 62 is a circular ring made of copper, aluminum, or a copper-aluminum alloy, uniformly fixedly assembled on the outer circumference of the heat exchange tube 61, which can expand the heat transfer area of ​​the heat exchange tube 61 and make the temperature distribution inside the reactor 1 more uniform.

[0034] The inner wall of the reactor 1 is also fixedly equipped with a temperature sensor 65 (such as a thermocouple or platinum resistance sensor). Its detection end extends into the reaction area inside the reactor 1, and its signal output end is connected to the external control system to monitor the temperature inside the reactor 1 in real time and feed it back to the heat exchange medium supply system to realize automatic temperature regulation (such as increasing the flow rate of the heat exchange medium when the temperature is lower than the set value, and reducing the flow rate when the temperature is higher than the set value).

[0035] In addition, to further improve temperature uniformity, several connecting rods 63 are uniformly fixedly mounted on the circumference of the rotating rod 503, and an arc-shaped plate 64 is fixedly mounted on the end of the connecting rod 63 away from the rotating rod 503. When the rotating rod 503 drives the filter plate 502 to rotate, the connecting rod 63 synchronously drives the arc-shaped plate 64 to rotate, fanning the airflow in the reactor 1 to form a circulating flow, avoiding local temperature differences, and ensuring that the silicon-carbon particles and carbon source gas react in a uniform temperature environment.

[0036] Working principle: The heat exchange medium is introduced through the heat exchange tube 61, and the temperature sensor 65 and control system are activated to preheat the temperature inside the reactor 1 to the set reaction temperature. At the same time, the motor 513 is turned on, driving the rotor 503 to rotate the filter plate 502 at a set speed, and the scraper 506 rotates in contact with the filter plate 502. The control valve of the feed pipe 7 is opened, and silicon carbide particles are quantitatively fed into the reactor 1 through the hopper or screw feeder. At the same time, the gas valve of the air inlet pipe 2 is opened, and carbon source gas is introduced into the reactor 1. After being dispersed by the distribution plate 3, the gas forms a uniform airflow. The silicon carbide particles are suspended in the reactor 1 under the action of the airflow, forming a dynamic mixing system.

[0037] The carbon source gas is decomposed into carbon atoms at high temperature and uniformly deposited on the surface of silicon-carbon particles to form a carbon coating layer. The exhaust gas generated by the reaction enters the exhaust pipe 4 through the connecting pipe 501. During the process, the filter plate 502 intercepts the silicon-carbon particles carried in the exhaust gas, and the scraper 506 scrapes the particles off to the slide pipe 505 and returns them to the reactor 1 through the guide pipe 504 to continue the reaction. After the exhaust gas is discharged from the exhaust pipe 4, it enters the subsequent exhaust gas treatment system to meet the emission standards.

[0038] After the reaction continues for the set time, the control valve of the discharge pipe 8 is opened to stably discharge the coated silicon-carbon anode material. After collection, it is subjected to subsequent screening, drying and other treatments to complete the entire coating process.

[0039] In the description of this utility model, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0040] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0041] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0042] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0043] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A fluidized bed reactor for coating silicon-carbon anode material, comprising a reactor (1), wherein an exhaust pipe (4) is fixedly connected to the center of the upper end of the reactor (1), characterized in that, Also includes: The filter structure (5) is installed inside the reactor (1), with its inlet end connected to the reactor (1) and its outlet end connected to the inlet end of the exhaust pipe (4). The filter plate (502) is rotatably installed at the air inlet of the filter structure (5) to intercept carbon and silicon particles in the exhaust gas. The guide tube (504) is connected to a scraper (506) at one end facing the filter plate (502), and the other end extends to the bottom of the reactor (1). The scraper (506) rests against the surface of the filter plate (502).

2. The fluidized bed reactor for silicon-carbon anode material coating as described in claim 1, characterized in that, The filter structure (5) includes: The connecting pipe (501) is set horizontally inside the reactor (1). Both ends of the connecting pipe (501) are open and connected to the filter plate (502). The middle part of the connecting pipe (501) is connected to the air inlet of the exhaust pipe (4).

3. The fluidized bed reactor for silicon-carbon anode material coating as described in claim 2, characterized in that, A rotating rod (503) is concentrically arranged inside the connecting pipe (501), and the rotating rod (503) is fixedly connected to the two filter plates (502); A motor (513) is fixed on the outer wall of the reactor (1), and the output end of the motor (513) is coaxially and fixedly connected to the rotating rod (503).

4. The fluidized bed reactor for silicon-carbon anode material coating as described in claim 3, characterized in that, A slide tube (505) is slidably connected to the inside of the guide tube (504) facing the filter plate (502) along its axial direction. A notch is formed on the outer circumferential surface of the slide tube (505) along its axial direction. A scraper (506) is set at the notch on the outer circumferential surface of the slide tube (505).

5. The fluidized bed reactor for silicon-carbon anode material coating as described in claim 4, characterized in that, The slide tube (505) is inclined inside the reactor (1), and the angle between it and the horizontal plane is 30-60 degrees.

6. The fluidized bed reactor for silicon-carbon anode material coating as described in claim 5, characterized in that, A fixing plate (508) is fixed on the outer circumferential surface of the guide tube (504); A sleeve (509) is fixedly sleeved at one end of the slide tube (505) facing the guide tube (504), and the sleeve (509) is slidably sleeved on the outside of the fixed plate (508); A round rod (510) is connected to one end of the sleeve (509) facing the slide tube (505). Several triangular blocks (507) are evenly distributed in a ring on the circumference of the filter plate (502). During the rotation of the filter plate (502), the triangular blocks (507) intermittently squeeze the round rod (510). A spring (511) is sleeved on the outside of the slide tube (505), and the two ends of the spring (511) are connected to the sleeve (509) and the fixing plate (508) respectively.

7. The fluidized bed reactor for silicon-carbon anode material coating as described in claim 6, characterized in that, Both the fixed plate (508) and the sleeve (509) have a regular hexagonal cross section.

8. The fluidized bed reactor for silicon-carbon anode material coating as described in claim 7, characterized in that, A stop (512) is fixed to the inner wall of the sleeve (509), and a fixing plate (508) is located between the stop (512) and the spring (511).

9. The fluidized bed reactor for silicon-carbon anode material coating as described in any one of claims 1-8, characterized in that, The inner wall of the reactor (1) is provided with a heating structure (6); The heating structure (6) includes a heat exchange tube (61) fixedly connected to the reactor (1), and several heat-conducting rings (62) are distributed on the outer wall of the heat exchange tube (61). A temperature sensor (65) is installed on the inner wall of the reactor (1).

10. The fluidized bed reactor for silicon-carbon anode material coating as described in any one of claims 3-8, characterized in that, Several connecting rods (63) are fixedly mounted on the circumference of the rotating rod (503), and an arc plate (64) is fixedly mounted on one end of the connecting rod (63).

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