Fluidized bed device for circulating multi-stage reaction

Abstract

The invention relates to the technical field of fluidized beds, and discloses a circulating multistage reaction fluidized bed device which comprises a fluidized bed, a plurality of fluidized bed reactors and a plurality of heating plates are mounted in the fluidized bed in a stacked manner, and the plurality of fluidized bed reactors are communicated with one another. A feed port and an air inlet are formed in one side of the fluidized bed reactor at the top end of the inner cavity of the fluidized bed, a discharge port and an air outlet are formed in one side of the fluidized bed reactor at the bottom end of the inner cavity of the fluidized bed, a circulating device is arranged between the air outlet and the air inlet, and a stirring device is arranged in the fluidized bed reactor. According to the invention, the fluidized bed device is internally provided with a plurality of fluidized bed reactors which are overlapped with one another, and the plurality of fluidized bed reactors are communicated with one another, so that silane gas and carbon source gas after a first-stage reaction enter the next fluidized bed reactor, and a multi-stage reaction is formed; the problem that gas-solid separation is difficult due to the fact that a traditional fluidized bed device is large in size and high in gas speed is effectively solved.

Description

Technical Field

[0001] This invention relates to the field of fluidized bed technology, specifically to a fluidized bed apparatus for a multi-stage circulating reaction. Background Technology

[0002] A fluidized bed, or simply fluidized bed, is a reactor that uses gas or liquid to pass through a layer of granular solid particles, causing the solid particles to be in a suspended state and carrying out gas-solid or liquid-solid phase reaction processes. Traditional fluidized beds require a large space to boil the solids, and with the addition of an extension section, compared to fixed beds, fluidized bed reactors occupy more space for the same production capacity. Due to the large size of fluidized bed devices, problems such as uneven heating and difficulties in gas-solid separation caused by high gas velocities are prone to occur. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0004] A fluidized bed device for a multi-stage circulating reaction includes a fluidized bed, in which multiple fluidized bed reactors and multiple heating plates are stacked and installed. The multiple fluidized bed reactors are interconnected. A feed inlet and an air inlet are provided on one side of the fluidized bed reactor located at the top of the fluidized bed cavity, and a discharge outlet and an air outlet are provided on one side of the fluidized bed reactor located at the bottom of the fluidized bed cavity. A circulation device is provided between the air outlet and the air inlet, and an agitation device is provided inside the fluidized bed reactor.

[0005] The agitation device includes a driving component and a stirring component, so that when the fluidized bed reactor is running, the driving component drives the stirring component to circulate and agitate within the fluidized bed reactor.

[0006] Multiple air inlet pipes are provided on one side of the fluidized bed, and the air inlet pipes are connected to the fluidized bed reactor.

[0007] Preferably, the fluidized bed reactor includes an annular bottom chamber and an annular top cover, the annular bottom chamber and the annular top cover are fixedly connected by screws, and the heating plates are located at the bottom of the annular bottom chamber and the top of the annular top cover, respectively.

[0008] Preferably, the driving component includes a first motor, an annular lower rail groove is provided at the bottom of the annular bottom cavity, a cylindrical tube is provided at the bottom of the annular bottom cavity, a first gear is rotatably connected to the bottom of the cylindrical tube through a bearing, the first gear is located in the annular lower rail groove, a lower annular rack is fixedly connected to the inner wall of the annular lower rail groove, the first gear meshes with the lower annular rack, and the output end of the first motor is fixedly connected to the first gear.

[0009] Preferably, the stirring component includes multiple stirring blades, a vertical cylinder is fixedly connected to the top axis of the cylindrical tube, a sleeve is fitted around the outer periphery of the vertical cylinder, a second gear is fixedly connected to the top of the sleeve, an annular upper rail groove is opened at the bottom of the annular top cover, the second gear is located in the annular upper rail groove, an upper annular rack is fixedly connected to the inner wall of the annular upper rail groove, the second gear meshes with the upper annular rack, and multiple stirring blades are fixedly installed on the outer periphery of the sleeve.

[0010] Preferably, the driving component further includes an arc-shaped limiting block, an extension rod is fixedly connected to the top of the vertical cylinder, the extension rod passes through the sleeve and the second gear and extends into the annular upper rail groove, an annular limiting groove is provided at the bottom of the annular upper rail groove, and the arc-shaped limiting block is slidably disposed in the annular limiting groove.

[0011] Preferably, a connecting pipe is fixedly connected between two of the fluidized bed reactors to allow for mutual flow between the multiple fluidized bed reactors, and a first one-way valve is fixedly connected between the connecting pipes.

[0012] Preferably, the inlet pipe includes a silane gas inlet pipe and a carbon source gas inlet pipe, which are respectively located on one side of two fluidized bed reactors in the middle of the fluidized bed. The silane gas inlet pipe and the carbon source gas inlet pipe extend into the fluidized bed reactor and communicate with the fluidized bed reactor. A second one-way valve is fixedly connected to both the silane gas inlet pipe and the carbon source gas inlet pipe.

[0013] Preferably, the circulation device includes an outlet channel and an inlet channel, both of which are connected to a fluidized bed reactor. A first filter screen is fixedly connected at the connection point between the outlet channel and the fluidized bed reactor. A vent pipe is fixedly connected between the outlet channel and the inlet channel. The vent pipe includes a rectangular vent pipe and a circular vent pipe. One end of the rectangular vent pipe is fixedly connected to the outlet channel, and the circular vent pipe is fixedly installed between the inlet channel and the rectangular vent pipe. An air pump is fixedly connected to the circular vent pipe.

[0014] Preferably, a discharge channel is provided at the bottom of the air outlet channel, and a connecting channel is fixedly connected between the discharge channel and the air outlet channel to enable communication between them. A second filter screen is fixedly connected in the connecting channel. The discharge channel is connected to the fluidized bed reactor. An air inlet pipe is provided on the air inlet channel and is connected to the fluidized bed reactor. A third one-way valve is fixedly connected to both the air inlet pipe and the discharge channel.

[0015] Preferably, both the discharge channel and the rectangular air pipe are equipped with a conveying component. The conveying component includes a rotating rod. The two ends of the two rotating rods are rotatably connected to the discharge channel and the rectangular air pipe respectively through bearings. Multiple rotating plates are fixedly connected to the outer periphery of the rotating rods. The top of the rotating plates is in contact with the inner wall of the discharge channel and the rectangular air pipe. A second motor is fixedly connected to one side of the discharge channel. The output end of the second motor is fixedly connected to one of the rotating rods. A third gear is fixedly connected to one end of each of the two rotating rods. A toothed belt that meshes with the third gear is sleeved on the outer periphery of each of the two third gears. The inner cavity of the rectangular air pipe is provided with multiple vertical shafts. Baffles are fixedly connected to the top and bottom of each vertical shaft. The baffle located at the top of the vertical shaft is fixedly connected to the rectangular air pipe. A filter plate is sleeved on the outer periphery of the vertical shaft. Springs are provided on both sides of the top of the filter plate. The springs are sleeved on the outer periphery of the vertical shaft. During the rotation of the rotating plate, the filter plate is driven to move upward.

[0016] Compared with the prior art, the present invention provides a fluidized bed device for cyclic multi-stage reaction, which has the following beneficial effects:

[0017] 1. A fluidized bed device for multi-stage cyclic reactions, comprising multiple superimposed fluidized bed reactors interconnected within the fluidized bed device. This allows for a physical reaction between silane gas and carbon source gas in the top fluidized bed reactor. The interconnected reactors then allow the silane and carbon source gas from the first stage reaction to enter the next reactor, thus forming a multi-stage reaction. Inlet pipes are installed on multiple fluidized bed reactors in the middle of the fluidized bed to introduce carbon source gas, enabling secondary carbon coating of the material to form a silicon-carbon composite material. Simultaneously, silane gas is introduced to replenish silicon atoms, increasing the silicon loading and improving the electrochemical performance of the silicon-carbon composite material. This effectively solves the problems of large volume and high gas velocity in traditional fluidized bed devices, which lead to difficult gas-solid separation. Furthermore, this invention allows for continuous production and adjustable throughput, enabling flexible control according to demand.

[0018] 2. A fluidized bed device for a multi-stage circulating reaction, which solves the problems of large volume and uneven heating in traditional fluidized bed devices by stacking the fluidized bed reactor and heating plates on each other, so that the two heating plates heat the top and bottom sides of the fluidized bed reactor and the fluidized bed reactor is heated evenly.

[0019] 3. A fluidized bed device for a multi-stage circulating reaction, wherein a carrier gas is introduced through the inlet through a circulation device, and the material enters the fluidized bed reactor along with the carrier gas for fluidization, and is finally discharged from the outlet. During the exhaust process, the silicon-carbon composite material in the carrier gas is intercepted once by a first filter screen, and the silicon-carbon composite material in the carrier gas is intercepted a second time by a filter plate. The silicon-carbon composite material is then carried to the discharge channel by a transport component, thereby forming a recycling of the carrier gas.

[0020] 4. A fluidized bed device for a multi-stage circulating reaction, wherein a drive unit drives a stirring element to move in a circular trajectory within an annular chamber, and during the movement, the stirring element rotates. The rotation of the stirring blades agitates the fluidization reaction within the fluidized bed reactor, thereby improving the efficiency of carbon source gas in carbon coating materials to form silicon-carbon composite materials. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 This is one of the schematic diagrams of the fluidized bed reactor and heating plate structure of the present invention;

[0023] Figure 3 This is one of the schematic diagrams of the fluidized bed reactor and heating plate structure of the present invention;

[0024] Figure 4 This is a schematic diagram of the stirring device structure of the present invention;

[0025] Figure 5 For the present invention Figure 4 Schematic diagram of the structure of section A;

[0026] Figure 6 This is one of the schematic diagrams of the circulation device structure of the present invention;

[0027] Figure 7 For the present invention Figure 6 Schematic diagram of section B in the middle;

[0028] Figure 8 For the present invention Figure 6 Schematic diagram of the C-section structure;

[0029] Figure 9 This is a second schematic diagram of the circulation device structure of the present invention;

[0030] Figure 10 For the present invention Figure 9 Schematic diagram of the structure of section D.

[0031] In the diagram: 1. Fluidized bed; 2. Fluidized bed reactor; 3. Heating plate; 4. Feed inlet; 5. Air inlet; 6. Discharge outlet; 7. Air outlet; 8. Circulation device; 9. Agitator; 91. Drive component; 92. Stirring component; 10. Air inlet pipe; 201. Annular bottom silo; 202. Annular top cover; 911. First motor; 912. Annular lower rail groove; 913. Cylindrical cylinder; 914. First gear; 915. Lower annular rack; 916. Arc-shaped limiting block; 917. Extension rod; 918. Annular limiting groove; 921. Stirring blade; 922. Vertical cylinder; 923. Sleeve; 924. Second gear; 925. Annular upper rail groove; 926. 11. Upper ring rack; 12. Connecting pipe; 13. First check valve; 14. Silane gas input pipe; 15. Carbon source gas input pipe; 16. Second check valve; 17. Outlet channel; 18. Inlet channel; 19. First filter screen; 20. Vent pipe; 21. Rectangular gas pipe; 22. Circular gas pipe; 23. Air pump; 24. Discharge channel; 25. Connecting channel; 26. Second filter screen; 27. Inlet circular pipe; 28. Third check valve; 29. ​​Handling component; 20. Rotating rod; 20. Rotating plate; 21. Second motor; 22. Third gear; 33. Toothed belt; 44. Baffle; 55. Filter plate; 66. Spring. Detailed Implementation

[0032] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] As described in the background section, there are shortcomings in the existing technology. In order to solve the above-mentioned technical problems, this application proposes a fluidized bed device for a cyclic multi-stage reaction.

[0034] Example 1:

[0035] Please see Figures 1-5 A circulating multi-stage reaction fluidized bed device includes a fluidized bed 1, multiple fluidized bed reactors 2 and multiple heating plates 3 stacked inside the fluidized bed 1, the multiple fluidized bed reactors 2 being interconnected, a feed inlet 4 and an air inlet 5 being provided on one side of the fluidized bed reactor 2 located at the top of the inner cavity of the fluidized bed 1, a discharge outlet 6 and an air outlet 7 being provided on one side of the fluidized bed reactor 2 located at the bottom of the inner cavity of the fluidized bed 1, a circulation device 8 being provided between the air outlet 7 and the air inlet 5, and an agitation device 9 being provided inside the fluidized bed reactor 2;

[0036] The stirring device 9 includes a driving element 91 and a stirring element 92, so that when the fluidized bed reactor 2 is running, the driving element 91 drives the stirring element 92 to circulate and stir within the fluidized bed reactor 2.

[0037] Multiple air inlet pipes 10 are provided on one side of the fluidized bed 1, and the air inlet pipes 10 are connected to the fluidized bed reactor 2.

[0038] Specifically, the top cross-section of the fluidized bed reactor 2 is annular, and multiple fluidized bed reactors 2 are connected in a multi-stage series. External heating is used. A heating plate 3 heats the upper and lower fluidized bed reactors 2 from the middle of the multi-stage fluidized bed reactor 2, ensuring good heating uniformity. The fluidized bed 1 has a feed inlet 4, a discharge outlet 6, an air inlet 5, and an air outlet 7. The reaction temperature is 400-600℃, and the residence time is 24-48h. The material enters the device with the carrier gas and is fluidized. The silane gas entering through the air inlet 5 undergoes a thermal decomposition reaction at this temperature to generate silicon particles, which are loaded onto porous carbon during the fluidization process. After the gas exits from the outlet 7, it returns to the fluidized bed reactor 2 through the circulation device 8, achieving the effect of recycling. In the multi-stage fluidized bed reactor 2, carbon source gas can be introduced into the subsequent fluidized bed reactor 2 as needed to perform secondary carbon coating on the material to form silicon-carbon composite material. Alternatively, silane gas can be introduced to supplement silicon atoms and increase the silicon loading, thereby improving the electrochemical performance of silicon-carbon composite material. During the operation of the fluidized bed reactor 2, the drive component 91 drives the stirring component 92 to circulate and stir within the fluidized bed reactor 2. The rotation of the stirring blades 921 stirs the fluidization reaction inside the fluidized bed reactor 2.

[0039] Multiple superimposed fluidized bed reactors 2 are arranged within the fluidized bed 1 device, and these reactors 2 are interconnected. This allows for a physical reaction between silane gas and carbon source gas within the top fluidized bed reactor 2 of the fluidized bed 1. The interconnected arrangement of the reactors 2 allows the silane gas and carbon source gas from the first-stage reaction to enter the next fluidized bed reactor 2, thus forming a multi-stage reaction. Inlet pipes 10 are installed on the multiple fluidized bed reactors 2 in the middle of the fluidized bed 1, through which carbon source gas is introduced to perform secondary carbon coating on the material, forming a silicon-carbon composite material. Simultaneously, silane gas is introduced to replenish silicon atoms, increasing the silicon loading and thus improving the electrochemical performance of the silicon-carbon composite material. This invention effectively solves the problems of large volume and high gas velocity in traditional fluidized bed devices, which lead to difficult gas-solid separation. Furthermore, this invention allows for continuous production, with adjustable throughput and flexible control according to demand.

[0040] Example 2:

[0041] The difference from Embodiment 1 described above is that, see reference... Figures 4-7For the agitation device 9 mentioned above, the fluidized bed reactor 2 includes an annular bottom chamber 201 and an annular top cover 202. The annular bottom chamber 201 and the annular top cover 202 are fixedly connected by screws. The heating plates 3 are located at the bottom of the annular bottom chamber 201 and the top of the annular top cover 202, respectively.

[0042] The driving component 91 includes a first motor 911. An annular lower rail groove 912 is opened at the bottom of the inner cavity of the annular bottom chamber 201. A cylindrical tube 913 is provided at the bottom of the inner cavity of the annular bottom chamber 201. A first gear 914 is rotatably connected to the bottom of the cylindrical tube 913 through a bearing. The first gear 914 is located in the annular lower rail groove 912. A lower annular rack 915 is fixedly connected to the inner wall of the annular lower rail groove 912. The first gear 914 and the lower annular rack 915 are meshed and connected. The output end of the first motor 911 is fixedly connected to the first gear 914.

[0043] The stirring component 92 includes multiple stirring blades 921. A vertical cylinder 922 is fixedly connected to the top axis of the cylindrical cylinder 913. A sleeve 923 is fitted around the outer periphery of the vertical cylinder 922. A second gear 924 is fixedly connected to the top of the sleeve 923. An annular upper rail groove 925 is opened at the bottom of the annular top cover 202. The second gear 924 is located in the annular upper rail groove 925. An upper annular rack 926 is fixedly connected to the inner wall of the annular upper rail groove 925. The second gear 924 meshes with the upper annular rack 926. Multiple stirring blades 921 are fixedly installed on the outer periphery of the sleeve 923.

[0044] The drive unit 91 also includes an arc-shaped limiting block 916. An extension rod 917 is fixedly connected to the top of the vertical cylinder 922. The extension rod 917 passes through the sleeve 923 and the second gear 924 and extends into the annular upper rail groove 925. An annular limiting groove 918 is opened at the bottom of the annular upper rail groove 925. The arc-shaped limiting block 916 is slidably disposed in the annular limiting groove 918.

[0045] Specifically, during the operation of the fluidized bed reactor 2, the first motor 911 operates. Through the fixed connection between the output end of the first motor 911 and the first gear 914, the first gear 914 rotates. Since the cylindrical cylinder 913, the vertical cylinder 922, and the extension rod 917 are all fixedly connected, and the arc-shaped limiting block 916 matches the annular limiting groove 918, the cylindrical cylinder 913 does not rotate when the first motor 911 drives the first gear 914. Through the meshing connection between the first gear 914 and the lower annular rack 915 on the inner wall of the annular lower rail groove 912, the rotation of the first gear 914 drives the cylindrical cylinder 913, the vertical cylinder 922, and the sleeve 923 on the outer periphery of the vertical cylinder 922, in a circular motion. The lower track groove 912 moves along its track path, thereby driving the second gear 924 at the top of the sleeve 923 to move along the track path of the lower track groove 912. At this time, through the meshing connection between the second gear 924 and the upper annular rack 926 on the inner wall of the upper annular track groove 925, the second gear 924 is driven to rotate. Through the sleeve 923 and the vertical cylinder 922, the sleeve 923 and the stirring blade 921 on the outer periphery of the sleeve 923 are driven to rotate. Thus, the stirring blade 921 rotates while moving along the track path of the lower track groove 912. Through the rotation of the stirring blade 921, the fluidization reaction in the inner cavity of the fluidized bed reactor 2 is stirred, improving the efficiency of carbon source gas to carbon-coat the material to form silicon-carbon composite materials.

[0046] Example 3:

[0047] The difference from Embodiment 2 described above is that, see reference... Figures 1-10 For the fluidized bed reactor 2 mentioned above, a connecting pipe 11 is fixedly connected between two fluidized bed reactors 2 to allow mutual flow between multiple fluidized bed reactors 2, and a first one-way valve 12 is fixedly connected between the connecting pipes 11.

[0048] The inlet pipe 10 includes a silane gas inlet pipe 101 and a carbon source gas inlet pipe 102. The silane gas inlet pipe 101 and the carbon source gas inlet pipe 102 are respectively located on one side of the two fluidized bed reactors 2 in the middle of the fluidized bed 1. The silane gas inlet pipe 101 and the carbon source gas inlet pipe 102 extend into the fluidized bed reactor 2 and are connected to the fluidized bed reactor 2. A second one-way valve 103 is fixedly connected to both the silane gas inlet pipe 101 and the carbon source gas inlet pipe 102.

[0049] Specifically, multiple superimposed fluidized bed reactors 2 are arranged within the fluidized bed 1 device, and these reactors 2 are interconnected. This allows for a physical reaction between silane gas and carbon source gas within the top fluidized bed reactor 2 of the fluidized bed 1. The interconnected arrangement of the reactors allows the silane gas and carbon source gas from the first-stage reaction to enter the next fluidized bed reactor 2, thus forming a multi-stage reaction. Inlet pipes 10 are installed on the multiple fluidized bed reactors 2 in the middle of the fluidized bed 1, through which carbon source gas is introduced to perform secondary carbon coating on the material, forming a silicon-carbon composite material. Simultaneously, silane gas is introduced to replenish silicon atoms, increasing the silicon loading and thus improving the electrochemical performance of the silicon-carbon composite material. Furthermore, this invention allows for continuous production, with adjustable processing capacity and flexible control according to demand.

[0050] Example 4:

[0051] The difference from Embodiment 3 above is that, see reference... Figures 1-10 For the above-mentioned circulation device 8, the circulation device 8 includes an air outlet channel 81 and an air inlet channel 82. Both the air outlet channel 81 and the air inlet channel 82 are connected to the fluidized bed reactor 2. A first filter screen 83 is fixedly connected at the connection between the air outlet channel 81 and the fluidized bed reactor 2. An air vent pipe 84 is fixedly connected between the air outlet channel 81 and the air inlet channel 82. The air vent pipe 84 includes a rectangular air pipe 841 and a circular air pipe 842. One end of the rectangular air pipe 841 is fixedly connected to the air outlet channel 81. The circular air pipe 842 is fixedly installed between the air inlet channel 82 and the rectangular air pipe 841. An air pump 843 is fixedly connected to the circular air pipe 842.

[0052] A discharge channel 13 is provided at the bottom of the air outlet channel 81. A connecting channel 14 is fixedly connected between the discharge channel 13 and the air outlet channel 81 so that the discharge channel 13 and the air outlet channel 81 can communicate with each other. A second filter screen 15 is fixedly connected in the connecting channel 14. The discharge channel 13 is connected to the fluidized bed reactor 2. An air inlet pipe 16 is provided on the air inlet channel 82. The air inlet pipe 16 is connected to the fluidized bed reactor 2. A third one-way valve 17 is fixedly connected to both the air inlet pipe 16 and the discharge channel 13.

[0053] Both the discharge channel 13 and the rectangular air pipe 841 are equipped with conveying components 80. Each conveying component 80 includes a rotating rod 801. The two ends of the two rotating rods 801 are rotatably connected to the discharge channel 13 and the rectangular air pipe 841 respectively via bearings. Multiple rotating plates 802 are fixedly connected to the outer periphery of the rotating rods 801. The top ends of the rotating plates 802 are in contact with the inner walls of the discharge channel 13 and the rectangular air pipe 841. A second motor 803 is fixedly connected to one side of the discharge channel 13. The output end of the second motor 803 is fixedly connected to one of the rotating rods 801. The two rotating rods 801... 01 One end is fixedly connected to a third gear 804. The outer periphery of the two third gears 804 is fitted with a toothed belt 805 that meshes with the third gear 804. The inner cavity of the rectangular air tube 841 is provided with multiple vertical shafts. The top and bottom of the vertical shafts are fixedly connected to baffles 806. The baffle 806 at the top of the vertical shaft is fixedly connected to the rectangular air tube 841. The outer periphery of the vertical shaft is fitted with a filter plate 807. The top two sides of the filter plate 807 are provided with springs 808. The springs 808 are fitted on the outer periphery of the vertical shaft. During the rotation of the rotating plate 802, the filter plate 807 is driven to move upward.

[0054] Specifically, carrier gas is introduced through inlet 5, and the material enters the fluidized bed reactor 2 along with the carrier gas for fluidization, and finally exits from outlet 7. During the exhaust process, the silicon-carbon composite material in the carrier gas is intercepted once by the first filter screen 83. The carrier gas passes through the first filter screen 83 and enters the outlet channel 81. At the same time, the carrier gas and the silicon-carbon composite material enter the discharge channel 13. The outlet channel 81 is connected to the discharge channel 13, and a third one-way valve 17 is provided on one side of the discharge channel 13. The carrier gas will blow part of the silicon-carbon composite material through the connecting channel 14 to the space between the rectangular air pipe 841 and the outlet channel 81. When the silicon-carbon composite material is located in the discharge channel 13 and between the rectangular air pipe 841 and the outlet channel 81, the second motor 803 runs, driving the rotating rod 801 to rotate, thereby driving the rotating plate 802 to rotate. The rotation of 02 moves the silicon-carbon composite material remaining in the discharge channel 13 outward. At the same time, when the rotating plate 802 located between the rectangular air pipe 841 and the air outlet channel 81 rotates, when the rotating plate 802 contacts the filter plate 807, the rotating plate 802 drives the filter plate 807 to move upward, and the spring 808 is in a compressed state. When the rotating plate 802 is not in contact with the filter plate 807, the spring 808 restores its elasticity and drives the filter plate 807 to move downward. Thus, during the rotation of the rotating plate 802, the filter plate 807 moves up and down, and at the same time scrapes the surface of the filter plate 807, thereby preventing the silicon-carbon composite material from adhering to the filter plate 807. The filter plate 807 performs secondary interception of the silicon-carbon composite material in the carrier gas, and the silicon-carbon composite material is carried by the conveying component 80 to flow into the discharge channel 13, thereby forming the recycling of the carrier gas.

[0055] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fluidized bed apparatus for a multi-stage circulating reaction, comprising a fluidized bed, characterized in that: Multiple fluidized bed reactors and multiple heating plates are stacked and installed inside the fluidized bed. The multiple fluidized bed reactors are interconnected. A feed inlet and an air inlet are provided on one side of the fluidized bed reactor located at the top of the fluidized bed cavity, and a discharge outlet and an air outlet are provided on one side of the fluidized bed reactor located at the bottom of the fluidized bed cavity. A circulation device is provided between the air outlet and the air inlet. An agitation device is provided inside the fluidized bed reactor. The agitation device includes a driving component and a stirring component, so that when the fluidized bed reactor is running, the driving component drives the stirring component to circulate and agitate within the fluidized bed reactor. Multiple air inlet pipes are provided on one side of the fluidized bed, and the air inlet pipes are connected to the fluidized bed reactor.

2. The fluidized bed device for a circulating multi-stage reaction according to claim 1, characterized in that: The fluidized bed reactor includes an annular bottom chamber and an annular top cover, which are fixedly connected by screws. The heating plates are located at the bottom of the annular bottom chamber and the top of the annular top cover, respectively.

3. The fluidized bed device for a circulating multi-stage reaction according to claim 2, characterized in that: The driving component includes a first motor. An annular lower rail groove is provided at the bottom of the annular bottom cavity. A cylindrical tube is provided at the bottom of the annular bottom cavity. A first gear is rotatably connected to the bottom of the cylindrical tube through a bearing. The first gear is located in the annular lower rail groove. A lower annular rack is fixedly connected to the inner wall of the annular lower rail groove. The first gear meshes with the lower annular rack. The output end of the first motor is fixedly connected to the first gear.

4. A fluidized bed device for a circulating multi-stage reaction according to claim 3, characterized in that: The stirring component includes multiple stirring blades. A vertical cylinder is fixedly connected to the top axis of the cylindrical tube. A sleeve is fitted around the outer periphery of the vertical cylinder. A second gear is fixedly connected to the top of the sleeve. An annular upper rail groove is opened at the bottom of the annular top cover. The second gear is located in the annular upper rail groove. An upper annular rack is fixedly connected to the inner wall of the annular upper rail groove. The second gear meshes with the upper annular rack. Multiple stirring blades are fixedly installed on the outer periphery of the sleeve.

5. A fluidized bed device for a circulating multi-stage reaction according to claim 4, characterized in that: The driving component also includes an arc-shaped limiting block. An extension rod is fixedly connected to the top of the vertical cylinder. The extension rod passes through the sleeve and the second gear and extends into the annular upper rail groove. An annular limiting groove is opened at the bottom of the annular upper rail groove. The arc-shaped limiting block is slidably disposed in the annular limiting groove.

6. A fluidized bed apparatus for a multi-stage circulating reaction according to claim 5, characterized in that: A connecting pipe is fixedly connected between the two fluidized bed reactors to allow flow between the multiple fluidized bed reactors, and a first one-way valve is fixedly connected between the connecting pipes.

7. A fluidized bed apparatus for a circulating multi-stage reaction according to claim 6, characterized in that: The inlet pipe includes a silane gas inlet pipe and a carbon source gas inlet pipe. The silane gas inlet pipe and the carbon source gas inlet pipe are respectively located on one side of the two fluidized bed reactors in the middle of the fluidized bed. The silane gas inlet pipe and the carbon source gas inlet pipe extend into the fluidized bed reactor and communicate with the fluidized bed reactor. A second one-way valve is fixedly connected to both the silane gas inlet pipe and the carbon source gas inlet pipe.

8. A fluidized bed apparatus for a circulating multi-stage reaction according to claim 7, characterized in that: The circulation device includes an outlet channel and an inlet channel, both of which are connected to a fluidized bed reactor. A first filter screen is fixedly connected at the connection point between the outlet channel and the fluidized bed reactor. A vent pipe is fixedly connected between the outlet channel and the inlet channel. The vent pipe includes a rectangular vent pipe and a circular vent pipe. One end of the rectangular vent pipe is fixedly connected to the outlet channel, and the circular vent pipe is fixedly installed between the inlet channel and the rectangular vent pipe. An air pump is fixedly connected to the circular vent pipe.

9. A fluidized bed apparatus for a circulating multi-stage reaction according to claim 8, characterized in that: A discharge channel is provided at the bottom of the air outlet channel. A connecting channel is fixedly connected between the discharge channel and the air outlet channel to enable communication between them. A second filter screen is fixedly connected inside the connecting channel. The discharge channel is connected to the fluidized bed reactor. An air inlet pipe is provided on the air inlet channel and is connected to the fluidized bed reactor. A third one-way valve is fixedly connected to both the air inlet pipe and the discharge channel.

10. A fluidized bed apparatus for a multi-stage cyclic reaction according to claim 9, characterized in that: Both the discharge channel and the rectangular air pipe are equipped with conveying components. Each conveying component includes a rotating rod. The two ends of the two rotating rods are rotatably connected to the discharge channel and the rectangular air pipe respectively via bearings. Multiple rotating plates are fixedly connected to the outer periphery of the rotating rods. The top of the rotating plates is in contact with the inner wall of the discharge channel and the rectangular air pipe. A second motor is fixedly connected to one side of the discharge channel. The output end of the second motor is fixedly connected to one of the rotating rods. A third gear is fixedly connected to one end of each of the two rotating rods. A toothed belt that meshes with the third gear is sleeved on the outer periphery of each of the two third gears. The inner cavity of the rectangular air pipe is equipped with multiple vertical shafts. Baffles are fixedly connected to the top and bottom of each vertical shaft. The baffle at the top of the vertical shaft is fixedly connected to the rectangular air pipe. A filter plate is sleeved on the outer periphery of the vertical shaft. Springs are provided on both sides of the top of the filter plate. The springs are sleeved on the outer periphery of the vertical shaft. During the rotation of the rotating plate, the filter plate is driven to move upward.

Images