Granular silicon powder discharging device

Abstract

The utility model provides a particle silicon powder discharging device which comprises a fluidized bed (2), a material inlet of the fluidized bed (2) is connected with a seed crystal tank (1), a material outlet of the fluidized bed (2) is connected with a particle silicon collecting tank (3), a tail gas outlet of the fluidized bed (2) is connected with a cyclone separator (4), and a solid material outlet of the cyclone separator (4) is connected with a particle silicon collecting tank (5). The gaseous material outlet is connected with a first silicon powder filter (6), and a material outlet of the first silicon powder filter (6) is connected with jacket type powder discharging equipment (7) for discharging and packaging silicon powder.

Description

Technical Field

[0001] This utility model relates to a powder discharge device, and more particularly to a particle silicon powder discharge device. Background Technology

[0002] This section provides only background information relevant to this disclosure and is not necessarily prior art.

[0003] In a fluidized bed reactor, silane gas undergoes heterogeneous decomposition into silicon and hydrogen. Silicon deposits on the seed crystal surface, forming 1-3 mm granular polycrystalline silicon. Some of the decomposed silicon does not adhere to the seed crystal surface, forming silicon powder. This powder, along with the hydrogen generated in the reaction and unreacted silane gas, forms tail gas that is discharged from the fluidized bed. The tail gas passes through a silicon powder filter, where silicon powder adheres to the filter element. Through a backflushing system, the silicon powder is discharged into a silicon powder collection tank, and finally, silicon powder is recovered using a silicon powder collection bag.

[0004] When the fluidized bed malfunctions and the gas velocity is too high, the granular silicon generated inside the fluidized bed will be discharged with the exhaust gas, resulting in the collection of silicon powder containing granular silicon. This granular silicon in the silicon powder has a serious impact on downstream equipment. At the same time, during the silicon powder discharge process, silicon powder will be sprayed out from above the silicon powder collection bag, causing environmental pollution and affecting the respiratory system of the discharge personnel. Discharge operators must wear dust masks.

[0005] It should be noted that the information disclosed in the background section above is only used to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Utility Model Content

[0006] Purpose of the invention: The technical problem to be solved by this utility model is to provide a particle silicon powder removal device to address the shortcomings of the existing technology.

[0007] To solve the above-mentioned technical problems, this utility model discloses a particulate silicon powder removal device, comprising:

[0008] A fluidized bed, wherein the material inlet of the fluidized bed is connected to a seed crystal tank, the material outlet is connected to a granular silicon collection tank, the exhaust gas outlet is connected to a cyclone separator, the solid material outlet of the cyclone separator is connected to a granular silicon collection tank, the gaseous material outlet is connected to a first silicon powder filter, and the material outlet of the first silicon powder filter is connected to a jacketed powder discharge device for discharging and packaging silicon powder.

[0009] Furthermore, the particulate silicon powder removal device also includes:

[0010] A jacket device is installed at the silicon powder outlet of the silicon powder collection tank. The jacket device is a hollow double-layer sleeve structure, wherein the inner layer is used to discharge silicon powder from the silicon powder outlet of the silicon powder collection tank, and the outer layer is used to collect the silicon powder that escapes during the discharge.

[0011] Furthermore, one end of the jacket device is fluidly connected to the silicon powder outlet at the bottom of the silicon powder collection tank, and the other end is detachably equipped with a silicon powder collection bag.

[0012] The outer side of the jacket device is open and fluidly connected to a silicon powder filter for collecting silicon powder from the outer layer.

[0013] Furthermore, the silicon powder filter is connected to a vacuum pumping device, which creates a negative pressure on the outer layer of the jacketed device through the silicon powder filter and pipes.

[0014] Furthermore, the jacket device includes:

[0015] The jacket has a hollow tubular outer wall and a hollow tubular inner wall, wherein the outer wall is fitted over the inner wall.

[0016] Furthermore, the outer wall of the jacket and the inner wall of the jacket are coaxially arranged.

[0017] Furthermore, the silicon powder collection bag has a double-layer bag structure, comprising:

[0018] Inner bag and outer bag; wherein the outer bag is fitted over the outside of the inner bag.

[0019] Furthermore, the top of the inner wall of the jacket is fluidly connected to the powder discharge port at the bottom of the silicon powder collection tank;

[0020] The bottom of the inner wall of the jacket is detachably connected to the top opening of the inner bag, and the connection point is the fixing point of the inner bag.

[0021] Furthermore, the cavity formed by the outer wall of the jacket and the inner wall of the jacket is closed at the top;

[0022] The bottom of the outer wall of the jacket and the top opening of the outer bag are detachably connected, and the connection point is the fixing point of the outer bag.

[0023] Furthermore, a pipe is fixedly installed at the opening on the inner wall of the jacket, which is fluidly connected to the silicon powder filter; the silicon powder filter filters the substance input through the pipe to obtain waste silicon powder.

[0024] Beneficial effects:

[0025] 1. This utility model achieves the separation of granular silicon and fine silicon powder by designing a cyclone separator.

[0026] 2. The powder discharge port adopts a double-layer jacketed sealing structure. A vacuum device is used to create a dynamic air seal in the jacket negative pressure layer, which solves the problem of powder spraying from the powder discharge port.

[0027] 3. The inner wall of the powder discharge jacket of this device is mirror polished or coated with tungsten carbide to reduce powder adhesion;

[0028] 4. This utility model solves the problem of the impact of the powder discharge process on the environment and operators. Attached Figure Description

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, and the advantages of the present invention in the above and / or other aspects will become clearer.

[0030] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0031] Figure 2 This is a schematic diagram of a jacketed powder discharge device.

[0032] In the diagram, 1 is the seed crystal tank, 2 is the fluidized bed, 3 is the granular silicon collection tank, 4 is the cyclone separator, 5 is the granular silicon collection tank, 6 is the first silicon powder filter, and 7 is the jacketed powder discharge device.

[0033] 701 is a silicon powder collection tank, 702 is a jacket device, 703 is a silicon powder collection bag, 704 is a second silicon powder filter, 705 is a vacuum device; 711 is a powder discharge port, 721 is the outer wall of the jacket, 722 is the inner wall of the jacket, 731 is the inner bag, 732 is the outer bag, 7311 is the inner bag fixing point, and 7321 is the outer bag fixing point. Detailed Implementation

[0034] This utility model proposes a particle silicon powder removal device, such as... Figure 1 As shown, it includes:

[0035] During the granular silicon generation process, the material inlet of fluidized bed 2 is connected to seed crystal tank 1 to feed the material into fluidized bed 2 for reaction, and the generated granular silicon is sent to granular silicon collection tank 3 through the material outlet of fluidized bed 2.

[0036] The exhaust gas outlet of fluidized bed 2 is connected to cyclone separator 4. The exhaust gas generated in fluidized bed 2 enters cyclone separator 4 to obtain granular silicon and silicon powder.

[0037] Cyclone separator 4 is connected to granular silicon collection tank 5 and first silicon powder filter 6 respectively. Granular silicon collection tank 5 is used to store granular silicon, and first silicon powder filter 6 is used to process the fine powder airflow containing silicon powder to obtain silicon powder.

[0038] The first silicon powder filter 6 is connected to the jacketed powder discharge device 7 and is used to discharge and package silicon powder.

[0039] Among them, such as Figure 2 As shown, the jacketed powder discharge device 7 includes:

[0040] A jacketed device 702 is installed at the silicon powder outlet of the silicon powder collection tank 701. This jacketed device 702 has a hollow double-layered tube structure. The inner cavity connects the silicon powder collection tank 701 and the silicon powder collection bag 703, serving as a conventional powder discharge channel. The outer cavity is connected to a silicon powder filter 704 via a pipe, used to collect overflowing silicon powder. The silicon powder filter 704 is connected to a vacuum device 705, which creates negative pressure in the outer cavity through the silicon powder filter 704.

[0041] The hollow double-layer sleeve structure of the jacket device 702 includes: a hollow tubular jacket outer wall 721 and a hollow tubular jacket inner wall 722, with the jacket outer wall 721 sleeved outside the jacket inner wall 722.

[0042] The silicon powder collection bag 703 has a double-layer bag structure, including an inner bag 731 and an outer bag 732, wherein the outer bag 732 is fitted over the inner bag 731.

[0043] The top of the inner wall 722 of the jacket is fluidly connected to the powder discharge port 711 at the bottom of the silicon powder collection tank 701, and the bottom is connected to the top opening of the inner bag 731. The connection point is the inner bag fixing point 7311.

[0044] The cavity formed by the outer wall 721 and the inner wall 722 of the jacket is closed at the top and connected at the bottom to the interlayer opening formed by the inner bag 731 and the outer bag 732. The connection point between the outer wall 721 of the jacket and the outer bag 732 is the outer bag fixing point 7321.

[0045] A pipe is fixedly provided on the side of the inner wall 722 of the jacket, which is in fluid connection with the silicon powder filter 704.

[0046] The silicon powder filter 704 filters the substances input through the pipeline, collects waste silicon powder, and discharges it from the bottom.

[0047] When using:

[0048] The silicon powder gas stream from the fluidized bed 2 exhaust gas preferentially passes through the cyclone separator 4 to recover granular particles (>10um). The recovered granular particles are discharged into the granular particle collection tank 5, realizing the separation of granular silicon from fine silicon powder.

[0049] The fine powder airflow is absorbed by the filter element after passing through the first silicon powder filter 6, and the silicon powder is discharged into the silicon powder collection tank 701 by backflushing.

[0050] A double-layer jacket is designed around the powder discharge port. The inner layer is the main powder discharge channel, and the outer layer is a negative pressure chamber (connected to the vacuum device 705). The negative pressure layer of the jacket forms a dynamic air seal, and the escaping silicon powder is immediately captured to the second silicon powder filter 704, which can effectively prevent powder spraying from the powder discharge port.

[0051] The inner wall of the jacket is mirror-polished or coated with tungsten carbide to reduce powder adhesion.

[0052] This utility model provides a concept and method for a particulate silicon powder removal device. There are many methods and approaches to implement this technical solution. The above description is only a preferred embodiment of this utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this utility model, and these improvements and modifications should also be considered within the protection scope of this utility model. All components not explicitly stated in this embodiment can be implemented using existing technology.

Claims

1. A particulate silicon powder removal device, characterized in that, include: Fluidized bed (2), the material inlet of the fluidized bed (2) is connected to the seed crystal tank (1), the material outlet is connected to the granular silicon collection tank (3), the tail gas outlet is connected to the cyclone separator (4), the solid material outlet of the cyclone separator (4) is connected to the granular silicon collection tank (5), the gaseous material outlet is connected to the first silicon powder filter (6), and the material outlet of the first silicon powder filter (6) is connected to the jacketed powder discharge device (7) for discharging and packaging silicon powder.

2. The particulate silicon powder removal device according to claim 1, characterized in that, The particulate silicon powder removal device further includes: A jacket device (702) is provided at the silicon powder outlet of the silicon powder collection tank (701). The jacket device (702) is a hollow double-layer sleeve structure, wherein the inner layer is used to discharge silicon powder from the silicon powder outlet of the silicon powder collection tank (701), and the outer layer is used to collect the silicon powder that escapes when the silicon powder is discharged.

3. The particulate silicon powder removal device according to claim 2, characterized in that, One end of the jacket device (702) is fluidly connected to the silicon powder outlet at the bottom of the silicon powder collection tank (701), and the other end is detachably equipped with a silicon powder collection bag (703). The outer side of the jacket device (702) is open and fluidly connected to the silicon powder filter (704) for collecting silicon powder from the outer layer.

4. The particulate silicon powder removal device according to claim 3, characterized in that, The silicon powder filter (704) is connected to the vacuum pumping device (705), and the vacuum pumping device (705) forms a negative pressure on the outer layer of the jacket device (702) through the silicon powder filter (704) and the pipe.

5. The particulate silicon powder removal device according to claim 4, characterized in that, The jacket device (702) includes: The outer wall (721) of the hollow tubular jacket and the inner wall (722) of the hollow tubular jacket are fitted outside the inner wall (722).

6. The particulate silicon powder removal device according to claim 5, characterized in that, The outer wall (721) and the inner wall (722) of the jacket are coaxially arranged.

7. A particulate silicon powder removal device according to claim 6, characterized in that, The silicon powder collection bag (703) has a double-layer bag structure, including: Inner bag (731) and outer bag (732); wherein the outer bag (732) is fitted over the outside of the inner bag (731).

8. The particulate silicon powder removal device according to claim 7, characterized in that, The top of the inner wall of the jacket (722) is fluidly connected to the powder discharge port (711) at the bottom of the silicon powder collection tank (701); The bottom of the inner wall of the jacket (722) is detachably connected to the top opening of the inner bag (731), and the connection point is the inner bag fixing point (7311).

9. A particulate silicon powder removal device according to claim 8, characterized in that, The cavity formed by the outer wall (721) and the inner wall (722) of the jacket is closed at the top; The bottom of the outer wall of the jacket (721) and the top opening of the outer bag (732) are detachably connected, and the connection point is the outer bag fixing point (7321).

10. A particulate silicon powder removal device according to claim 9, characterized in that, A pipe is fixedly installed at the side opening of the inner wall (722) of the jacket, which is fluidly connected to the silicon powder filter (704); the silicon powder filter (704) filters the substance input by the pipe to obtain waste silicon powder.

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