Efficient preparation device of silicon-carbon negative electrode material

Abstract

The utility model discloses a kind of efficient preparation devices of silicon-carbon negative electrode material, including circulating reactor unit;Circulating reactor unit includes vertically arranged reactor body, heating mechanism, stirring mechanism, gas shunt device, circulating power device and temperature field division cylinder;The top of reactor body is provided with tail gas exhaust, and the gas inlet of gas shunt device is connected with tail gas exhaust, and the first discharge port of gas shunt device and the inlet of circulating power device are interconnected;The lower part of reactor body is provided with circulation inlet, and the outlet of circulating power device and circulation inlet are interconnected;Temperature field division cylinder is erected in the inside below of reactor body, and there is pyrolysis gap between reactor body and temperature field division cylinder.This scheme realizes the circulation of raw gas in reactor body, and additionally adds temperature field division cylinder in its inside, which is beneficial to solve the technical problems of large gas consumption and low raw material utilization rate existing in existing fluidized bed device.

Description

Technical Field

[0001] This utility model relates to the field of silicon-carbon anode material production and preparation technology, and in particular to a high-efficiency preparation device for silicon-carbon anode materials. Background Technology

[0002] In existing technologies, most silicon-carbon anode materials are prepared using silane gas as the silicon source, acetylene as the carbon source, and porous carbon as the carrier. Specifically, the porous carbon carrier is placed in a fluidized bed reaction unit, and then an inert gas is introduced into it to remove oxygen. After heating to a specified temperature, the silane gas introduced into the reactor is thermally decomposed into silicon and hydrogen atoms. The silicon atoms are deposited and fill the pores of the porous carbon. Next, the carbon source gas introduced into the reactor is thermally decomposed into carbon and hydrogen atoms. The carbon atoms are deposited and coat the outer surface of the porous carbon filled with silicon atoms in the pores, thus forming the silicon-carbon anode material.

[0003] In the actual preparation process of silicon-carbon anode materials, when the raw material gas (including any one or a mixture of inert gas, silane gas and carbon source gas) enters the reactor body for reaction, the fluidization of the raw material gas is generally assisted only by the stirring mechanism set at the bottom of the reactor body, resulting in low raw material utilization. In addition, the raw material gas that has not yet reacted will be discharged through the tail gas outlet at the top of the reactor body. Therefore, the fluidized bed device used to prepare silicon-carbon anode materials still has the problems of large gas consumption and low raw material gas utilization. Utility Model Content

[0004] The purpose of this invention is to propose a highly efficient preparation device for silicon-carbon anode materials, which can effectively solve the technical problems of large gas consumption and low raw material utilization in the fluidized bed devices used for preparing silicon-carbon anode materials in the prior art, and overcome the shortcomings of the prior art.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A high-efficiency preparation apparatus for silicon-carbon anode materials includes a circulating reactor unit;

[0007] The circulating reactor unit includes a vertically arranged reactor body, a heating mechanism, a stirring mechanism, a gas diversion device, a circulating power device, and a temperature field dividing cylinder;

[0008] The heating mechanism is wrapped around the outside of the reactor body and is used to heat the reactor body; the stirring mechanism is located at the bottom of the reactor body and is used to stir the material inside the reactor body.

[0009] The gas diversion device has an inlet, a first outlet, and a second outlet. The second outlet of the gas diversion device is used to connect to the inlet of the exhaust gas treatment device.

[0010] The reactor body has a tail gas outlet at the top, and the gas inlet of the gas diversion device is connected to the tail gas outlet. The first outlet of the gas diversion device is connected to the inlet of the circulating power device. The reactor body has a circulation inlet at the bottom, and the outlet of the circulating power device is connected to the circulation inlet.

[0011] The temperature field dividing cylinder is installed inside the lower part of the reactor body, and a pyrolysis gap is left between the reactor body and the temperature field dividing cylinder; the temperature field dividing cylinder has a hollow structure, and the top and bottom of the temperature field dividing cylinder are connected to the interior of the reactor body; the stirring blades of the stirring mechanism are rotatably installed inside the temperature field dividing cylinder.

[0012] Preferably, the temperature field dividing cylinder includes a cylinder body and supporting legs;

[0013] The cylinder is a hollow cylindrical structure;

[0014] The support legs are provided in multiple ways, and the multiple support legs are circumferentially spaced at the bottom edge of the cylinder. The cylinder is installed to the inner bottom of the reactor body through the support legs.

[0015] Preferably, the height of the cylindrical body is 1 / 10 to 2 / 3 of the height of the straight cylindrical section of the reactor body.

[0016] Preferably, the inner diameter of the cylinder is 1 / 10 to 9 / 10 of the inner diameter of the straight section of the reactor body.

[0017] Preferably, the system further includes a gas delivery unit, which comprises an inert gas supply mechanism, a silane gas supply mechanism, and a carbon source gas supply mechanism. The raw material gas inlet of the circulating reactor unit is connected to the outlet of the inert gas supply mechanism, the outlet of the silane gas supply mechanism, and the outlet of the carbon source gas supply mechanism, respectively.

[0018] Preferably, it also includes a buffer tank, which is disposed between the gas diversion device and the exhaust gas treatment device;

[0019] The buffer tank is connected to the second outlet of the gas diversion device via a third pipe, and the buffer tank is connected to the inlet of the exhaust gas treatment device via a fourth pipe. The outlet of the third pipe and the inlet of the fourth pipe are both located inside the buffer tank.

[0020] Preferably, the gas diversion device is a three-way proportional valve.

[0021] Preferably, the gas splitting device includes a splitting connector, a first two-way proportional valve, and a second two-way proportional valve. The splitting connector includes a first interface, a second interface, and a third interface. The second interface is connected to the inlet of the first two-way proportional valve, and the third interface is connected to the inlet of the second two-way proportional valve.

[0022] The first interface is the gas inlet of the gas splitting device;

[0023] The outlet of the first two-way proportional valve is the first outlet of the gas diversion device;

[0024] The outlet of the second two-way proportional valve is the second outlet of the gas diversion device.

[0025] Preferably, the circulating power device is a fan or a Tesla valve.

[0026] Preferably, the reactor body has a discharge port, and the discharge port is connected to the inlet of the finished product tank.

[0027] The technical solution provided by this utility model can include the following beneficial effects:

[0028] 1. This scheme adds a gas diversion device and a circulation power device connected to the reactor body near the reactor body, so that the raw material gas entering the reactor body can form a gas circulation between the reactor body, the gas diversion device and the circulation power device under the drive of the circulation power device, thereby reducing the amount of fluidizing gas and improving the utilization rate of raw material gas, and greatly reducing the preparation cost.

[0029] 2. This scheme adds a temperature field dividing cylinder inside the reactor body. Since the heating mechanism is wrapped around the outside of the reactor body, a temperature field division is formed where the temperature inside the cylinder is lower and the temperature outside the cylinder is higher, thus creating a preparation process where adsorption is the main process inside the cylinder and pyrolysis is the main process outside the cylinder. When the porous carbon raw material is fluidized inside the reactor body, it is easy to achieve circulation inside and outside the temperature field dividing cylinder under the transport gas flow, so that the adsorption-pyrolysis process proceeds in an orderly manner, which is more conducive to improving the utilization rate of raw gas and reducing the preparation cost. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the structure of a high-efficiency preparation device for silicon-carbon anode material according to this utility model.

[0031] Figure 2 This is a partial structural schematic diagram of a high-efficiency preparation device for silicon-carbon anode materials according to this utility model.

[0032] Figure 3 This is a partial structural schematic diagram of a high-efficiency preparation device for silicon-carbon anode materials according to this utility model.

[0033] The components include: exhaust gas treatment device 1, gas conveying unit 2, inert gas supply mechanism 21, silane gas supply mechanism 22, carbon source gas supply mechanism 23, gas mixer 24, gas preheater 25, circulating reactor unit 3, reactor body 31, exhaust gas outlet 311, raw material gas inlet 312, discharge outlet 313, heating mechanism 32, stirring mechanism 33, gas diversion device 34, circulating power device 35, temperature field dividing cylinder 36, pyrolysis gap 361, cylinder body 362, support foot 363, buffer tank 4, and finished product tank 5. Detailed Implementation

[0034] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0035] This technical solution provides an efficient preparation device for silicon-carbon anode materials, including a circulating reactor unit 3;

[0036] The circulating reactor unit 3 includes a vertically arranged reactor body 31, a heating mechanism 32, a stirring mechanism 33, a gas diversion device 34, a circulating power device 35, and a temperature field dividing cylinder 36.

[0037] The heating mechanism 32 is wrapped around the outside of the reactor body 31 and is used to heat the reactor body 31; the stirring mechanism 33 is disposed at the bottom of the reactor body 31 and is used to stir the material inside the reactor body 31.

[0038] The gas diversion device 34 has an inlet, a first outlet, and a second outlet. The second outlet of the gas diversion device 34 is used to connect to the inlet of the exhaust gas treatment device 1.

[0039] The reactor body 31 has a tail gas outlet 311 at the top, and the gas inlet of the gas diversion device 34 is connected to the tail gas outlet 311. The first outlet of the gas diversion device 34 is connected to the inlet of the circulating power device 35. The reactor body 31 has a circulation inlet at the bottom, and the outlet of the circulating power device 35 is connected to the circulation inlet.

[0040] The temperature field dividing cylinder 36 is mounted inside the reactor body 31 at the bottom, and a pyrolysis gap 361 is left between the reactor body 31 and the temperature field dividing cylinder 36; the temperature field dividing cylinder 36 has a hollow structure, and the top and bottom of the temperature field dividing cylinder 36 are connected to the interior of the reactor body 31; the stirring blades of the stirring mechanism 33 are rotatably installed inside the temperature field dividing cylinder 36.

[0041] To address the technical problems of high gas consumption and low raw material utilization in existing fluidized bed devices for preparing silicon-carbon anode materials, this technical solution proposes a high-efficiency preparation device for silicon-carbon anode materials, such as... Figure 1-3 As shown, it includes a circulating reactor unit 3.

[0042] In the circulating reactor unit 3 of this scheme, a gas diversion device 34 and a circulating power device 35, which are connected to the conventional reactor body 31, are added near it. This allows a portion of the raw material gas entering the reactor body 31 (which is regulated and distributed by the gas diversion device 34) to form a gas circulation between the reactor body 31, the gas diversion device 34, and the circulating power device 35 under the drive of the circulating power device 35. This achieves the purpose of reducing the amount of fluidizing gas used and improving the utilization rate of raw material gas, thereby greatly reducing the preparation cost.

[0043] Furthermore, to improve the utilization rate of the raw material gas, this scheme adds a temperature field dividing cylinder 36 inside the reactor body 31. Since the heating mechanism 32 is wrapped around the outside of the reactor body 31, a temperature field division is formed in which the temperature inside the cylinder 36 is lower and the temperature outside the cylinder (i.e., the pyrolysis gap 361) is higher. The low temperature is conducive to the adsorption of porous carbon, and the high temperature is conducive to gas pyrolysis, thus forming a preparation process in which adsorption is the main process inside the cylinder and pyrolysis is the main process outside the cylinder. When the porous carbon raw material is fluidized inside the reactor body 31, it is easy to achieve circulation inside and outside the temperature field dividing cylinder 36 under the transport gas flow of the raw material gas, so that the adsorption-pyrolysis process proceeds in an orderly manner, which is more conducive to improving the utilization rate of the raw material gas and reducing the preparation cost.

[0044] The temperature field partitioning cylinder 36 of this application mainly solves two problems. The first is temperature: during silicon deposition, a low-temperature section is needed for gas-solid mixing, allowing the gas to enter the channels of porous carbon before contacting the high-temperature section for pyrolysis. It is undesirable for the gas to pyrolyze on the periphery of the porous carbon. The temperature field partitioning cylinder can prevent the gas inside the cylinder from pyrolyzing prematurely. The second is fluidization: after setting the temperature field partitioning cylinder, the inner diameter and area of ​​the cylinder are reduced, and the distribution of the same amount of gas will be more uniform, which will improve the uniformity of mixing (this is because the gas is dispersed from the center to the periphery, and the gas velocity on the outside will be reduced; the larger the diameter, the lower the gas velocity on the outside). At the same time, the same volume of powder inside the cylinder will be piled up higher, and the gas passage time will be longer, which can reduce the negative effect of low utilization caused by the rapid passage of powder due to increased gas velocity.

[0045] It should be noted that the heating mechanism 32 in this solution can be a heating tube, and the stirring mechanism 33 can be a rotating stirring blade. The exhaust gas treatment device 1 in this solution is a conventional exhaust gas treatment device in the art, and its specific structure will not be described in detail here. The gas flow adjustment and distribution of the gas diversion device 34 shall be adjusted by technicians according to the preparation situation.

[0046] To further explain, the temperature field dividing cylinder 36 includes a cylinder body 362 and a supporting foot 363;

[0047] The cylinder 362 is a hollow cylindrical structure;

[0048] Multiple support feet 363 are provided, and the multiple support feet 363 are circumferentially spaced at the bottom edge of the cylinder 362. The cylinder 362 is installed on the inner bottom of the reactor body 31 through the support feet 363.

[0049] This facilitates the interconnection between the cylinder 362 and the reactor body 31, avoiding any impact on the fluidization of the reactants within the reactor body 31. Figure 3 As shown.

[0050] To further clarify, the height of the cylindrical body 362 is 1 / 10 to 2 / 3 of the height of the straight cylindrical section of the reactor body 31. For example... Figure 2 As shown, the height of the cylindrical body 362 is h, and the height of the straight cylindrical section of the reactor body 31 is H.

[0051] To further clarify, the inner diameter of the cylindrical body 362 is 1 / 10 to 9 / 10 of the inner diameter of the straight cylindrical section of the reactor body 31.

[0052] The inner diameter of the cylinder 362 refers to the inner wall diameter of the cylinder 362, and the inner diameter of the straight section of the reactor body 31 refers to the inner wall diameter of the straight section.

[0053] Furthermore, it also includes a gas delivery unit 2, which includes an inert gas supply mechanism 21, a silane gas supply mechanism 22, and a carbon source gas supply mechanism 23. The raw material gas inlet 312 of the circulating reactor unit 3 is connected to the outlet of the inert gas supply mechanism 21, the outlet of the silane gas supply mechanism 22, and the outlet of the carbon source gas supply mechanism 23, respectively.

[0054] Furthermore, the gas delivery unit 2 also includes a gas mixer 24 and a gas preheater 25;

[0055] The gas mixer 24 and the gas preheater 25 are connected in sequence, and the inlet of the gas mixer 24 is connected to the outlet of the inert gas supply mechanism 21, the outlet of the silane gas supply mechanism 22 and the outlet of the carbon source gas supply mechanism 23, respectively. The outlet of the gas preheater 25 is connected to the raw material gas inlet 312.

[0056] The inert gas and the reaction gas (i.e., silane gas / carbon source gas) are fully mixed and preheated before entering the circulating reactor unit 3 under the action of the gas mixer 24 and the gas preheater 25. This helps to shorten the heating time of the heating mechanism 32, reduce the energy consumption of the heating mechanism 32, and improve the reaction efficiency.

[0057] Furthermore, it also includes a buffer tank 4, which is disposed between the gas diversion device 34 and the exhaust gas treatment device 1;

[0058] The buffer tank 4 is connected to the second outlet of the gas diversion device 34 via a third pipe, and the buffer tank 4 is connected to the inlet of the exhaust gas treatment device 1 via a fourth pipe. The outlet of the third pipe and the inlet of the fourth pipe are both located inside the buffer tank 4.

[0059] The exhaust gas treatment device 1 in this field usually includes a liquid seal tank. In this solution, an empty buffer tank 4 is added between the circulation tank 35 and the exhaust gas treatment device 1, which can effectively prevent the liquid from flowing back into the liquid seal tank in the exhaust gas treatment device 1.

[0060] To further clarify, the gas diversion device 34 is a three-way proportional valve.

[0061] To further explain, the gas diversion device 34 includes a diversion connector, a first two-way proportional valve, and a second two-way proportional valve. The diversion connector includes a first interface, a second interface, and a third interface. The second interface is connected to the inlet of the first two-way proportional valve, and the third interface is connected to the inlet of the second two-way proportional valve.

[0062] The first interface is the gas inlet of the gas splitting device 34;

[0063] The outlet of the first two-way proportional valve is the first outlet of the gas diversion device 34;

[0064] The outlet of the second two-way proportional valve is the second outlet of the gas diversion device 34.

[0065] To further clarify, the circulating power unit 35 is a fan or a Tesla valve.

[0066] To further explain, the reactor body 31 has a discharge port 313, and the discharge port 313 is connected to the inlet of the finished product tank 5.

[0067] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0068] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0069] In the description of this utility model, it should be understood that the directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this utility model. The directional terms "inner" and "outer" refer to the inner and outer contours of each component itself.

[0070] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0071] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this utility model.

[0072] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0073] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A high-efficiency preparation apparatus for silicon-carbon anode materials, characterized in that: Includes a circulating reactor unit; The circulating reactor unit includes a vertically arranged reactor body, a heating mechanism, a stirring mechanism, a gas diversion device, a circulating power device, and a temperature field dividing cylinder; The heating mechanism is wrapped around the outside of the reactor body and is used to heat the reactor body; the stirring mechanism is located at the bottom of the reactor body and is used to stir the material inside the reactor body. The gas diversion device has an inlet, a first outlet, and a second outlet. The second outlet of the gas diversion device is used to connect to the inlet of the exhaust gas treatment device. The reactor body has a tail gas outlet at the top, and the gas inlet of the gas diversion device is connected to the tail gas outlet. The first outlet of the gas diversion device is connected to the inlet of the circulating power device. The reactor body has a circulation inlet at the bottom, and the outlet of the circulating power device is connected to the circulation inlet. The temperature field dividing cylinder is installed inside the lower part of the reactor body, and a pyrolysis gap is left between the reactor body and the temperature field dividing cylinder; the temperature field dividing cylinder has a hollow structure, and the top and bottom of the temperature field dividing cylinder are connected to the interior of the reactor body; the stirring blades of the stirring mechanism are rotatably installed inside the temperature field dividing cylinder.

2. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 1, characterized in that: The temperature field dividing cylinder includes a cylinder body and supporting legs; The cylinder is a hollow cylindrical structure; The support legs are provided in multiple ways, and the multiple support legs are circumferentially spaced at the bottom edge of the cylinder. The cylinder is installed to the inner bottom of the reactor body through the support legs.

3. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 2, characterized in that: The height of the cylindrical body is 1 / 10 to 2 / 3 of the height of the straight cylindrical section of the reactor body.

4. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 2, characterized in that: The inner diameter of the cylinder is 1 / 10 to 9 / 10 of the inner diameter of the straight section of the reactor body.

5. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 1, characterized in that: It also includes a gas delivery unit, which comprises an inert gas supply mechanism, a silane gas supply mechanism, and a carbon source gas supply mechanism. The raw material gas inlet of the circulating reactor unit is connected to the outlet of the inert gas supply mechanism, the outlet of the silane gas supply mechanism, and the outlet of the carbon source gas supply mechanism, respectively.

6. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 1, characterized in that: It also includes a buffer tank, which is disposed between the gas diversion device and the exhaust gas treatment device; The buffer tank is connected to the second outlet of the gas diversion device via a third pipe, and the buffer tank is connected to the inlet of the exhaust gas treatment device via a fourth pipe. The outlet of the third pipe and the inlet of the fourth pipe are both located inside the buffer tank.

7. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 1, characterized in that: The gas splitting device is a three-way proportional valve.

8. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 1, characterized in that: The gas splitting device includes a splitting connector, a first two-way proportional valve, and a second two-way proportional valve. The splitting connector includes a first interface, a second interface, and a third interface. The second interface is connected to the inlet of the first two-way proportional valve, and the third interface is connected to the inlet of the second two-way proportional valve. The first interface is the gas inlet of the gas splitting device; The outlet of the first two-way proportional valve is the first outlet of the gas diversion device; The outlet of the second two-way proportional valve is the second outlet of the gas diversion device.

9. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 1, characterized in that: The circulating power unit is a fan or a Tesla valve.

10. The high-efficiency preparation apparatus for silicon-carbon anode material according to claim 1, characterized in that: The reactor body has a discharge port, which is connected to the inlet of the finished product tank.

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