A large-scale dispersed silicon-carbon fluidized bed

Abstract

The present application relates to fluidization equipment technical field, specifically for a large-scale scattered silicon carbon fluidized bed, including reactor shell, the reactor shell is provided with gas distributor, the reactor shell is installed above the gas distributor for the first stirring mechanism of stirring material, the reactor shell is provided with first air inlet pipe, one end of the first air inlet pipe is communicated with the gas distributor, the first air inlet pipe is communicated with second air inlet pipe, the second air inlet pipe is communicated with the first stirring mechanism, and the structure that forms through the discharge of gas in the second air inlet pipe makes the first stirring mechanism run, the reactor shell is installed above the first stirring mechanism for the second stirring mechanism of stirring material, the raw material gas concentration at the upper and lower height in the reactor shell is balanced, it is convenient to make the cladding layer thickness and the nature of product uniform, the gas bubble in the reactor shell is scattered at the same time, the purpose of uniform gas-solid mixing is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of fluidization equipment, in particular to a large-scale scattered silicon-carbon fluidized bed. BACKGROUND

[0002] Fluidized bed is widely used in chemical industry, material, energy and other fields due to its advantages of uniform material mixing, high heat and mass transfer efficiency, and convenient continuous operation. In the preparation process of silicon-carbon materials (such as silicon-carbon negative electrode materials and silicon carbide ceramic raw materials), the combination or conversion of silicon and carbon needs to be realized through high-temperature reaction, and the fluidized bed becomes one of the core equipment for such reactions.

[0003] The existing fluidized bed reactor is feasible for small size specifications, i.e. below DN800 in diameter, but as the equipment is scaled up, the diameter of the equipment becomes larger and the height of the bed layer becomes higher. After the raw gas (including any one and a mixture of multiple of inert gas, silane gas and carbon source gas) enters from the distributor, it is continuously consumed during upward flow, resulting in a large concentration gradient between the bottom and the top of the bed layer. The bottom particles are in contact with high-concentration reactants, which may generate a dense but excessively thick carbon layer, while the top particles can only generate a sparse carbon layer due to insufficient concentration of reactants. The thickness and properties of the coating layer of the entire bed layer product are not uniform. At the same time, due to the increase in the cross-sectional area of the bed layer, the gas does not uniformly pass through the bed layer, but forms large bubbles and merges into a gas column, directly penetrating through the bed layer, resulting in uneven gas-solid contact, poor mass and heat transfer capacity, insufficient product uniformity, and low raw material utilization rate. SUMMARY

[0004] In view of the deficiencies of the prior art and to overcome the defects of the prior art, the present application aims to provide a large-scale scattered silicon-carbon fluidized bed to solve the problems raised in the background art.

[0005] The technical solution is a large-scale scattered silicon-carbon fluidized bed, which comprises a reactor shell, a gas distributor is arranged in the reactor shell, a first stirring mechanism for stirring materials is mounted above the gas distributor in the reactor shell, a first gas inlet pipe is arranged at the reactor shell, one end of the first gas inlet pipe is communicated with the gas distributor, the first gas inlet pipe is communicated with a second gas inlet pipe, the second gas inlet pipe is communicated with the first stirring mechanism and forms a structure for the operation of the first stirring mechanism by discharging the gas in the second gas inlet pipe, and a second stirring mechanism for stirring materials is mounted above the first stirring mechanism in the reactor shell.

[0006] Preferably, the first stirring mechanism comprises a plurality of stirring assemblies, each stirring assembly is arranged axially along the reactor shell, and a feeding pipe is arranged above the lowest one of the stirring assemblies in the reactor shell.

[0007] Preferably, the gas distributor is provided with a plurality of air inlets, and each air inlet is evenly distributed in a ring around the axis of the reactor shell.

[0008] Preferably, the second stirring mechanism includes a rotating shaft, which is rotatably connected to the reactor shell. Stirring blades are installed at the lower end of the rotating shaft, and the portion of the upper end of the rotating shaft extending out of the reactor shell is fixedly connected to the output shaft of a drive motor. The drive motor is fixedly connected to the reactor shell.

[0009] Preferably, the reactor shell is wrapped with a first heating component for heating the reactor shell. The reactor shell is provided with several sets of pressure detection components for detecting the internal pressure of the reactor shell and temperature measurement components for detecting the internal and external temperatures of the reactor shell in the axial direction. A filter component for gas-solid separation is provided on the upper part of the reactor shell. A first outlet and a second outlet are provided on the top of the reactor shell. The first outlet is connected to a rupture pressure relief component for releasing abnormal high pressure, and the second outlet is connected to an active pressure relief component for releasing high pressure. A discharge port is provided at the bottom of the reactor shell.

[0010] Preferably, the first stirring mechanism further includes a vent pipe, which is coaxial with the reactor shell and fixedly connected to the reactor shell. The vent pipe is rotatably connected to each stirring component, and each stirring component is connected to the second air inlet pipe through the vent pipe.

[0011] Preferably, each of the stirring components includes a sleeve, the sleeve is rotatably connected to a vent pipe, a plurality of stirring tubes are fixedly connected to the sleeve, the stirring tubes are arranged in a ring around the circumference of the sleeve, an air jet is opened on the rear side of each sleeve in the direction of rotation, each air jet communicates with the vent pipe, and a stirring rod is installed on the end of each stirring tube away from the sleeve.

[0012] This invention provides a large-scale dispersed silicon-carbon fluidized bed, which has the following advantages compared with the prior art:

[0013] 1. Part of the raw material gas enters the reactor shell through the gas distributor, and another part enters the reactor shell after passing through the second inlet pipe and the first stirring mechanism in sequence. This replenishes the raw material gas that is continuously consumed during the upward flow from the gas distributor, and balances the raw material gas concentration at different heights within the reactor shell. This ensures that the coating thickness and properties of the product are uniform. At the same time, the entry of the raw material gas drives the first stirring mechanism to operate, and in conjunction with the second stirring mechanism, it breaks up the bubbles and disperses the large bubbles, achieving the purpose of uniform gas-solid mixing.

[0014] 2. Multiple air inlets disperse the gas, resulting in better fluidization and delaying the time it takes for the gas to coalesce into large bubbles. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the reactor shell of the present invention.

[0016] Figure 2 This is a partial schematic diagram of the reactor shell of the present invention.

[0017] Figure 3 This is a partial schematic diagram of the reactor shell of the present invention from another direction.

[0018] Figure 4 This is a partially enlarged cross-sectional schematic diagram of the first stirring mechanism of the present invention.

[0019] In the diagram: 1 Reactor shell, 2 Gas distributor, 2.1 Air inlet, 3 First stirring mechanism, 3.1 Stirring assembly, 3.1.1 Sleeve, 3.1.2 Stirring tube, 3.1.3 Jet nozzle, 3.1.4 Stirring rod, 3.2 Vent pipe, 3.3 Connecting rod, 3.4 Connecting pipe, 4 Second stirring mechanism, 4.1 Rotating shaft, 4.2 Stirring blades, 4.3 Drive motor, 5 First air inlet pipe, 6 Second air inlet pipe, 7 Feed pipe, 8 First heating assembly, 10 Pressure detection assembly, 11 Temperature measurement assembly, 12 Filter assembly, 13 First outlet, 14 Second outlet, 15 Explosion relief assembly, 16 Active pressure relief assembly, 17 Discharge port, 18 Valve. Detailed Implementation

[0020] The technical solutions of various 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. In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0021] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, 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 mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0022] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0023] Example 1:

[0024] Please see Figures 1-4 This invention provides a technical solution: a large-scale dispersed silicon-carbon fluidized bed, comprising a reactor shell 1, which is fixed to the ground by a support. A gas distributor 2 is installed inside the reactor shell 1. A first stirring mechanism 3 for stirring materials is installed above the gas distributor 2 inside the reactor shell 1. A first air inlet pipe 5 is provided at the reactor shell 1, one end of which is connected to the gas distributor 2. The first air inlet pipe 5 is connected to a second air inlet pipe 6 via a three-way valve. The second air inlet pipe 6 is connected to the first stirring mechanism 3, forming a structure where the discharge of gas through the second air inlet pipe 6 causes the first stirring mechanism 3 to operate. A second stirring mechanism 4 for stirring materials is installed above the first stirring mechanism 3 on the reactor shell 1. One end of the first air inlet pipe 5 is connected to an external raw material gas source, providing... The gas can be any one or a mixture of inert gas, silane gas, and carbon source gas. A valve 18 is installed between the first inlet pipe 5 and the second inlet pipe 6 at the other end. A valve 18 is also installed on the second inlet pipe 6. During use, part of the raw material gas enters the reactor shell 1 through the gas distributor 2, and part of the raw material gas enters the reactor shell 1 after passing through the second inlet pipe 6 and the first stirring mechanism 3 in sequence. This replenishes the raw material gas that is continuously consumed during the upward flow from the gas distributor 2, and balances the raw material gas concentration at the upper and lower heights of the reactor shell 1, so as to make the coating layer thickness and properties of the product uniform. At the same time, the entry of the raw material gas drives the first stirring mechanism 3 to operate, and then cooperates with the second stirring mechanism 4 to break up the bubbles and disperse the large bubbles, so as to achieve the purpose of uniform gas-solid mixing.

[0025] Furthermore, the first stirring mechanism 3 includes several stirring components 3.1, each stirring component 3.1 arranged axially along the reactor shell 1. The reactor shell 1 is provided with a feed pipe 7, on which a valve 18 is installed. The feed pipe 7 is located above the lowest stirring component 3.1. Silicon carbon raw material is added into the reactor shell 1 through the feed pipe 7. After the silicon carbon raw material enters, it is dispersed by the stirring components 3.1 and the gas-solid mixing is promoted. The feed pipe 7 can be located at the highest point of the second stirring mechanism 4. After the silicon carbon raw material enters, it can be dispersed by the second stirring mechanism 4 and each stirring component 3.1 in sequence.

[0026] Furthermore, the first stirring mechanism 3 also includes a vent pipe 3.2, which is coaxial with the reactor shell 1 and fixedly connected to the reactor shell 1. The vent pipe 3.2 is rotatably connected to each stirring component 3.1, and each stirring component 3.1 is connected to the second air inlet pipe 6 through the vent pipe 3.2. A connecting rod 3.3 is welded to the upper end of the vent pipe 3.2, and a connecting pipe 3.4 is welded to the upper part of the lower end of the vent pipe 3.2. The connecting rod 3.3 and the connecting pipe 3.4 are welded to the reactor shell 1, thereby fixing the vent pipe 3.2 to the reactor shell 1 and connecting the connecting pipe 3.4 to the vent pipe 3.2. One end of the connecting pipe 3.4 extending outside the reactor shell 1 is connected to the second air inlet pipe 6.

[0027] Furthermore, there are four sets of stirring components 3.1, and other suitable numbers can be arranged according to actual conditions. Each stirring component 3.1 includes a sleeve 3.1.1, which is rotatably connected to a vent pipe 3.2. The sleeve 3.1.1 is fitted over the vent pipe 3.2. A sealing ring is installed at the connection between the sleeve 3.1.1 and the vent pipe 3.2. Several stirring tubes 3.1.2 are fixedly connected to the sleeve 3.1.1, with two stirring tubes 3.1.2 welded to each sleeve 3.1.1. Each stirring tube 3.1.2 is perpendicular to the axis of the sleeve 3.1.1, and the stirring tubes 3.1.2 are evenly distributed in a ring around the circumference of the sleeve 3.1.1. A jet nozzle 3.1.3 is opened on the rear side of each sleeve 3.1.1 in the direction of rotation, and each jet nozzle 3.1.3 communicates with the vent pipe 3.2. The jet direction of each jet nozzle 3.1.3 is perpendicular to the axis of the sleeve 3.1.1 and the axis of the stirring tube 3.1.2. A stirring rod 3.1.4 is welded and fixed to the end of each stirring tube 3.1.2 away from the sleeve 3.1.1. The vent pipe 3.2 has a through hole at the sleeve 3.1.1, and the sleeve 3.1.1 has a vent hole at the connection with the stirring tube 3.1.2, so that each jet nozzle 3.1.3 communicates with the vent pipe 3.2. The vent pipe 3.2 is connected to the second air inlet pipe 6, so that the gas in the second air inlet pipe 6 is ejected through the jet nozzle 3.1.3. When the gas is ejected, the reaction force generated pushes the stirring tube 3.1.2 to rotate relative to the vent pipe 3.2, thereby forming a structure in which the first stirring mechanism 3 operates by the discharge of gas in the second air inlet pipe 6.

[0028] Furthermore, the gas distributor 2 is provided with several air inlets 2.1, and each air inlet 2.1 is evenly distributed in a ring around the axis of the reactor shell 1. The number of air inlets 2.1 is a suitable number, such as five, six, or seven, so as to disperse the gas. Under the same gas velocity, the distribution is more uniform and the fluidization effect is better than that of a single air inlet 2.1, which delays the time for the gas to coalesce into large bubbles.

[0029] Furthermore, the second stirring mechanism 4 includes a rotating shaft 4.1, which is rotatably connected to the reactor shell 1. The rotating shaft 4.1 is rotatably connected to the top of the reactor shell 1 through a sealed bearing. A stirring blade 4.2 is welded and fixed to the lower end of the rotating shaft 4.1. The stirring blade 4.2 has a frame structure. The part of the upper end of the rotating shaft 4.1 that extends out of the reactor shell 1 is fixedly connected to the output shaft of the drive motor 4.3 through a coupling. The drive motor 4.3 is a variable frequency motor. The drive motor 4.3 is bolted to the reactor shell 1, thereby further stirring the upper material and breaking up the air bubbles.

[0030] Furthermore, the reactor shell 1 is encased in a first heating assembly 8 for heating the reactor shell 1. The first heating assembly 8 is a prior art device, such as an electric heating wire heating device or an electromagnetic induction heating device, and will not be described in detail here. The reactor shell 1 is made of high-temperature resistant and corrosion-resistant stainless steel. Several sets of pressure detection assemblies 10 for detecting the internal pressure of the reactor shell 1 and temperature measuring assemblies 11 for detecting the internal and external temperatures of the reactor shell 1 are arranged in the axial direction. The pressure detection assembly 10 includes a connecting pipe connected to the inside of the reactor shell 1. After the connecting pipe extends out of the reactor shell 1, it is connected in sequence to a filter, a manual valve, and a three-way connecting pipe. One side of the three-way connecting pipe is connected to a pressure transmitter, and the other side is connected to a pneumatic diaphragm valve. The pneumatic diaphragm valve controls the nitrogen to purge at regular intervals to ensure the accuracy of pressure detection. The pressure detection assembly 10 is prior art and will not be described in detail here. The temperature measuring assembly 11 is divided into external temperature detection and internal temperature detection. The external temperature detection is mainly carried out by thermocouples to detect the temperature of the outer wall of the reactor, and the internal temperature... The detection mainly involves welding a connecting pipe through the inside and outside of the reactor shell 1. A thermocouple is inserted into the connecting pipe to detect the inner wall temperature. A filter assembly 12 for gas-solid separation is installed on the upper part of the reactor shell 1. The filter assembly 12 is a ceramic filter tube or a sintered metal filter element installed on the upper part of the reactor shell 1 to achieve gas-solid separation and prevent material from being discharged with the gas. This is existing technology and will not be described in detail here. The top of the reactor shell 1 is provided with a first outlet 13 and a second outlet 14. The first outlet 13 is connected to a rupture relief assembly 15 for releasing abnormal high pressure. The rupture relief assembly 15 is a rupture disc device in the prior art. When the rupture disc trigger pressure is reached, the rupture disc automatically bursts open to release the pressure. The second outlet 14 is connected to an active pressure relief assembly 16 for releasing high pressure. The active pressure relief assembly 16 includes a safety valve. When the pressure inside the reactor rises, the safety valve is actively opened to release the pressure. The bottom of the reactor shell 1 is provided with a discharge port 17, and a valve 18 is installed at the discharge port 17.

[0031] The present invention has been described in detail above through specific embodiments and examples, but these are not intended to limit the invention. Many modifications and improvements can be made by those skilled in the art without departing from the principles of the invention, and these should also be considered within the scope of protection of the present invention.

Claims

1. A large-scale dispersed silicon-carbon fluidized bed, comprising a reactor shell (1), wherein a gas distributor (2) is disposed within the reactor shell (1), characterized in that: The reactor shell (1) is equipped with a first stirring mechanism (3) for stirring materials above the gas distributor (2). A first air inlet pipe (5) is provided at the reactor shell (1). One end of the first air inlet pipe (5) is connected to the gas distributor (2). The first air inlet pipe (5) is connected to a second air inlet pipe (6). The second air inlet pipe (6) is connected to the first stirring mechanism (3) and forms a structure in which the first stirring mechanism (3) is operated by the discharge of gas in the second air inlet pipe (6). The reactor shell (1) is equipped with a second stirring mechanism (4) for stirring materials above the first stirring mechanism (3). The first stirring mechanism (3) includes a plurality of stirring components (3.1), each of the stirring components (3.1) is arranged axially along the reactor shell (1), the reactor shell (1) is provided with a feed pipe (7), the feed pipe (7) is located above the lowest one of the stirring components (3.1); The first stirring mechanism (3) further includes a vent pipe (3.2), which is coaxial with the reactor shell (1), and is fixedly connected to the reactor shell (1). The vent pipe (3.2) is rotatably connected to each stirring component (3.1), and each stirring component (3.1) is connected to the second air inlet pipe (6) through the vent pipe (3.2). Each of the stirring components (3.1) includes a sleeve (3.1.1), which is rotatably connected to a vent pipe (3.2). Several stirring tubes (3.1.2) are fixedly connected to the sleeve (3.1.1). Each stirring tube (3.1.2) is arranged in a ring around the sleeve (3.1.1). An air jet (3.1.3) is opened on the rear side of each sleeve (3.1.1) in the direction of rotation. Each air jet (3.1.3) communicates with the vent pipe (3.2). A stirring rod (3.1.4) is installed on the end of each stirring tube (3.1.2) away from the sleeve (3.1.1). The second stirring mechanism (4) includes a rotating shaft (4.1), which is rotatably connected to the reactor shell (1). A stirring blade (4.2) is installed at the lower end of the rotating shaft (4.1), and the part of the upper end of the rotating shaft (4.1) that extends out of the reactor shell (1) is fixedly connected to the output shaft of the drive motor (4.3). The drive motor (4.3) is fixedly connected to the reactor shell (1). The gas distributor (2) is provided with several air inlets (2.1), and each air inlet (2.1) is evenly distributed in a ring around the axis of the reactor shell (1).

2. A large-scale dispersed silicon-carbon fluidized bed according to claim 1, characterized in that: The reactor shell (1) is wrapped with a first heating component (8) for heating the reactor shell (1). The reactor shell (1) is provided with several sets of pressure detection components (10) for detecting the pressure inside the reactor shell (1) and temperature measurement components (11) for detecting the temperature inside and outside the reactor shell (1) in the axial direction. The upper part of the reactor shell (1) is provided with a filter component (12) for gas-solid separation. The top of the reactor shell (1) is provided with a first outlet (13) and a second outlet (14). The first outlet (13) is connected to a blasting pressure relief component (15) for releasing abnormal high pressure. The second outlet (14) is connected to an active pressure relief component (16) for releasing high pressure. The bottom of the reactor shell (1) is provided with a discharge port (17).

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