Fluidized bed silicon powder impurity removal device for polysilicon and organosilicon

Abstract

The utility model discloses polycrystalline silicon and organic silicon fluidized bed silicon powder impurity removal device relates to polycrystalline silicon and organic silicon impurity removal field. The polycrystalline silicon and organic silicon fluidized bed silicon powder impurity removal device includes the impurity removal unit and cyclone separator, and the cyclone separator is set at the bottom of impurity removal unit, is provided with cleaning unit in the impurity removal unit, the cleaning unit includes the spray blowing subassembly, the lifting plate and the collection box, and the spray blowing subassembly sets up at one side of fluidized bed reactor, and the spray blowing angle of spray blowing subassembly and the inclination angle of filter screen are on the same horizontal plane, and the lifting plate slidingly connects on the side wall of fluidized bed reactor, and the collection box sets up at one side of lifting plate. The polycrystalline silicon and organic silicon fluidized bed silicon powder impurity removal device sets up the cleaning unit, can carry out effective spray blowing to the impurity on the filter screen, makes it separate from the filter screen surface. The cooperation of lifting plate and collection box has facilitated the collection and cleaning of impurity, and has reduced the labor intensity and maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of polycrystalline silicon and organosilicon impurity removal technology, specifically to a fluidized bed silicon powder impurity removal device for polycrystalline silicon and organosilicon. Background Technology

[0002] In the production of polysilicon and organosilicon, regardless of whether fluidized bed technology or other production methods are used, silicon powder impurities are inevitably generated. These impurities are diverse, including metallic impurities such as iron, aluminum, and copper, and non-metallic impurities such as calcium oxide and silicon dioxide. Their presence not only reduces the purity of silicon powder but may also affect the quality and performance of subsequent products.

[0003] In fluidized bed impurity removal devices, silicon powder, in a fluidized state, comes into full contact with the impurity-removing agent, effectively removing impurities. However, in actual production processes, the filter screens within the fluidized bed reactor are prone to clogging after prolonged use, leading to a decrease in impurity removal efficiency and affecting the continuity and stability of production. Furthermore, cleaning impurities from the filter screens is quite difficult, increasing equipment maintenance costs and labor intensity. Therefore, developing a fluidized bed silicon powder impurity removal device that can effectively clean filter screen impurities and ensure impurity removal efficiency is of significant practical importance. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device, which solves the problem that after prolonged use, the filter screen in some fluidized bed reactors is easily clogged by impurities, resulting in a decrease in impurity removal efficiency, affecting the continuity and stability of production, and making it difficult to clean impurities on the filter screen, thus increasing the maintenance cost and labor intensity of the equipment.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution: a polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device includes an impurity removal unit and a cyclone separator, wherein the cyclone separator is located at the bottom of the impurity removal unit, and a cleaning unit is provided inside the impurity removal unit;

[0006] The impurity removal unit includes:

[0007] Fluidized bed reactor, used for removing impurities from silicon powder;

[0008] A filter screen is inclinedly disposed inside the fluidized bed reactor and is used to filter impurities in the silicon powder.

[0009] The cleaning unit includes:

[0010] A jetting assembly is disposed on one side of the fluidized bed reactor, and the jetting angle of the jetting assembly is on the same horizontal plane as the tilt angle of the filter screen.

[0011] A lifting plate, which is slidably connected to the side wall of the fluidized bed reactor;

[0012] A collection box is disposed on one side of the lifting plate and is movably installed on the fluidized bed reactor.

[0013] Preferably, the impurity removal unit further includes:

[0014] A silicon powder storage container is disposed at the top of the fluidized bed reactor;

[0015] A desiccant storage tank is provided at the top of the fluidized bed reactor and is located on one side of the silicon powder storage container.

[0016] An air inlet pipe is located on one side of the bottom of the fluidized bed reactor;

[0017] A gas distribution plate, wherein the gas distribution plate is configured as multiple layers, and the multiple layers of gas distribution plates are installed inside the fluidized bed reactor;

[0018] The hopper is fixedly connected to the bottom end of the fluidized bed reactor.

[0019] Preferably, the bottom end of the silicon powder storage container is connected to the fluidized bed reactor;

[0020] The bottom of the impurity removal agent storage tank is connected to the fluidized bed reactor.

[0021] Preferably, an opening is provided on one side wall of the fluidized bed reactor, a receiving groove is provided at the top of the opening, and chutes are provided on both sides of the opening and the receiving groove.

[0022] Preferably, sliders are fixedly connected to both sides of the lifting plate, and the sliders are slidably connected in the groove.

[0023] Preferably, a handle is provided on the outer side of the lifting plate, which is used to drive the lifting plate to move up and down to control the opening and closing of the passage.

[0024] Preferably, the cyclone separator has an air outlet on its side and a material outlet at its bottom.

[0025] This utility model discloses a fluidized bed silicon powder impurity removal device for polycrystalline silicon and organosilicon, which has the following beneficial effects:

[0026] This fluidized bed silicon powder impurity removal device for polycrystalline silicon and organosilicon is equipped with a cleaning unit. By ensuring that the blowing angle of the blowing assembly is on the same horizontal plane as the tilt angle of the filter screen, impurities on the filter screen can be effectively blown away, causing them to detach from the filter screen surface. The combined use of the lifting plate and the collection box facilitates the collection and cleaning of impurities, avoiding the tediousness and danger of manual filter screen cleaning, and reducing labor intensity and maintenance costs. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a schematic diagram of the structure of this utility model;

[0029] Figure 2 This is a schematic diagram of the structure of the impurity removal unit, cleaning unit, and cyclone separator of this utility model;

[0030] Figure 3 This is a cross-sectional view of the fluidized bed reactor of this utility model.

[0031] In the diagram: 1. Impurity removal unit; 11. Fluidized bed reactor; 12. Silicon powder storage container; 13. Impurity removal agent storage tank; 14. Air inlet pipe; 15. Gas distribution plate; 16. Filter screen; 17. Hopper; 2. Cleaning unit; 21. Pulse blowing assembly; 22. Lifting plate; 23. Collection box; 3. Cyclone separator; 31. Air outlet; 32. Material outlet. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] This utility model discloses a fluidized bed silicon powder impurity removal device for polycrystalline silicon and organosilicon.

[0034] Example 1

[0035] According to the appendix Figure 1-3 As shown, it includes a cleaning unit 1 and a cyclone separator 3. The cyclone separator 3 is located at the bottom of the cleaning unit 1, and a cleaning unit 2 is installed inside the cleaning unit 1.

[0036] Impurity removal unit 1 includes:

[0037] Fluidized bed reactor 11 is used for silicon powder impurity removal;

[0038] Filter screen 16 is inclinedly disposed inside the fluidized bed reactor 11 and is used to filter impurities in the silicon powder.

[0039] Cleaning unit 2 includes:

[0040] The jetting assembly 21 is disposed on one side of the fluidized bed reactor 11, and the jetting angle of the jetting assembly 21 is on the same horizontal plane as the tilt angle of the filter screen 16.

[0041] Lifting plate 22 is slidably connected to the side wall of fluidized bed reactor 11;

[0042] A collection box 23 is disposed on one side of the lifting plate 22 and is movably mounted on the fluidized bed reactor 11. By ensuring the blowing angle of the blowing assembly 21 is on the same horizontal plane as the tilt angle of the filter screen 16, impurities on the filter screen 16 can be effectively blown away, causing them to detach from the surface of the filter screen 16. The combined use of the lifting plate 22 and the collection box 23 facilitates the collection and cleaning of impurities, avoids the tediousness and danger of manually cleaning the filter screen 16, and reduces labor intensity and maintenance costs.

[0043] Furthermore, the impurity removal unit 1 also includes:

[0044] A silicon powder storage container 12 is disposed on top of the fluidized bed reactor 11;

[0045] The impurity removal agent storage tank 13 is located on top of the fluidized bed reactor 11 and is situated on one side of the silicon powder storage container 12.

[0046] The air inlet pipe 14 is located on one side of the bottom of the fluidized bed reactor 11. A blower is installed at the other end of the air inlet pipe 14 to blow gas evenly into the fluidized bed reactor 11.

[0047] The gas distribution plate 15 is configured as a multi-layer gas distribution plate 15 and is installed in the fluidized bed reactor 11. Through the multi-layer gas distribution plate 15, the silicon powder is fully contacted with the impurity removal agent in the fluidized state.

[0048] Hopper 17 is fixedly connected to the bottom of fluidized bed reactor 11. Silicon powder in silicon powder storage container 12 and impurity remover in impurity remover storage tank 13 enter the fluidized bed reactor 11 through the bottom channels. Gas is introduced into the bottom of fluidized bed reactor 11 through air inlet pipe 14. After the gas is evenly distributed by multi-layer gas distribution plate 15, the silicon powder is fluidized in the fluidized bed reactor 11.

[0049] Furthermore, the bottom end of the silicon powder storage container 12 is connected to the fluidized bed reactor 11;

[0050] The bottom of the impurity removal agent storage tank 13 is connected to the fluidized bed reactor 11.

[0051] Furthermore, a through-hole is provided on one side wall of the fluidized bed reactor 11, a receiving groove is provided at the top of the through-hole, and chutes are provided on both sides of the through-hole and the receiving groove.

[0052] Furthermore, sliders are fixedly connected to both sides of the lifting plate 22, and the sliders are slidably connected in the groove.

[0053] Furthermore, a handle is provided on the outer side of the lifting plate 22. The handle is used to drive the lifting plate 22 up and down to control the opening and closing of the port. Through the port, receiving groove, and slide groove opened on the fluidized bed reactor 11, as well as the slider provided on the lifting plate 22, the lifting plate 22 can be easily slid to achieve the opening and closing control of the port. The addition of the handle makes it easy for the operator to drive the lifting plate 22 up and down, improving the ease of operation of the device.

[0054] Example 2

[0055] According to the appendix Figure 1-3 As shown, it includes a cleaning unit 1 and a cyclone separator 3. The cyclone separator 3 is located at the bottom of the cleaning unit 1, and a cleaning unit 2 is installed inside the cleaning unit 1.

[0056] Impurity removal unit 1 includes:

[0057] Fluidized bed reactor 11 is used for silicon powder impurity removal;

[0058] Filter screen 16 is inclinedly disposed inside the fluidized bed reactor 11 and is used to filter impurities in the silicon powder.

[0059] Cleaning unit 2 includes:

[0060] The jetting assembly 21 is disposed on one side of the fluidized bed reactor 11, and the jetting angle of the jetting assembly 21 is on the same horizontal plane as the tilt angle of the filter screen 16.

[0061] Lifting plate 22 is slidably connected to the side wall of fluidized bed reactor 11;

[0062] Collection box 23 is located on one side of lifting plate 22 and is movably installed on fluidized bed reactor 11.

[0063] Furthermore, the cyclone separator 3 has an air outlet 31 on its side and a discharge outlet 32 ​​at its bottom. A collection tank is provided at the bottom of the cyclone separator 3. The cyclone separator 3 uses centrifugal force to separate the purified silicon powder from the gas. The gas is discharged through the air outlet 31, and the silicon powder falls into the collection tank from the discharge outlet 32.

[0064] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A fluidized bed silicon powder impurity removal device for polycrystalline silicon and organosilicon, comprising an impurity removal unit (1) and a cyclone separator (3), wherein the cyclone separator (3) is disposed at the bottom of the impurity removal unit (1), characterized in that, The cleaning unit (2) is provided inside the impurity removal unit (1); The impurity removal unit (1) includes: Fluidized bed reactor (11) is used for silicon powder impurity removal; A filter screen (16) is inclinedly disposed inside the fluidized bed reactor (11) and is used to filter impurities in the silicon powder. The cleaning unit (2) includes: The jetting assembly (21) is disposed on one side of the fluidized bed reactor (11), and the jetting angle of the jetting assembly (21) is on the same horizontal plane as the tilt angle of the filter screen (16). A lifting plate (22) is slidably connected to the side wall of the fluidized bed reactor (11); Collection box (23) is disposed on one side of lifting plate (22) and is movably mounted on fluidized bed reactor (11).

2. The polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device according to claim 1, characterized in that, The impurity removal unit (1) further includes: A silicon powder storage container (12) is disposed on top of the fluidized bed reactor (11); A desiccant storage tank (13) is provided on top of the fluidized bed reactor (11) and is located on one side of the silicon powder storage container (12); An air inlet pipe (14) is provided on one side of the bottom of the fluidized bed reactor (11); Gas distribution plate (15), the gas distribution plate (15) is configured as multi-layered, and the multi-layered gas distribution plate (15) is installed in the fluidized bed reactor (11); Hopper (17) is fixedly connected to the bottom end of fluidized bed reactor (11).

3. The polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device according to claim 2, characterized in that, The bottom end of the silicon powder storage container (12) is connected to the fluidized bed reactor (11); The bottom end of the impurity removal agent storage tank (13) is connected to the fluidized bed reactor (11).

4. The polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device according to claim 1, characterized in that, The fluidized bed reactor (11) has an opening on one side wall, a receiving groove on the top of the opening, and chutes on both sides of the opening and the receiving groove.

5. The polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device according to claim 4, characterized in that, The lifting plate (22) has sliders fixedly connected to both sides, and the sliders are slidably connected in the groove.

6. The polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device according to claim 2, characterized in that, A handle is provided on the outside of the lifting plate (22), which is used to drive the lifting plate (22) to move up and down to control the opening and closing of the passage.

7. The polycrystalline silicon and organosilicon fluidized bed silicon powder impurity removal device according to claim 1, characterized in that, The cyclone separator (3) has an air outlet (31) on its side and a material outlet (32) at its bottom.

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