Fixing structure for end part of finger-shaped pipe and fluidized bed with relatively long service life

Abstract

The utility model discloses a fixing structure for the end part of a finger-shaped pipe and a fluidized bed with longer service life, and relates to a fluidized bed structure. The fixing structure comprises a plurality of wear-resisting heads used for being connected with the end of the outer finger-shaped pipe in a sealed mode through welding, and the adjacent wear-resisting heads are connected through rib plates. The fluidized bed comprises a fluidized bed body without a second layer of pipe hoop and the fixing structure. According to the utility model, the fixing structure at the end part of the finger-shaped tube is optimized, so that the vibration and abrasion of the finger-shaped tube are reduced, and the purpose of prolonging the service life of the fluidized bed is achieved.

Description

Technical Field

[0001] The utility model relates to a fluidized bed structure, in particular to a fixing structure of a finger-shaped tube end and a fluidized bed with a relatively long service life. Background Art

[0002] Fluidized bed reactor is an important equipment in polysilicon production. Its tube side medium is heat transfer oil, and its shell side medium is silicon powder and HCl gas. Its main function is to fully mix silicon powder and HCl gas in the shell side of the fluidized bed, and react at a temperature of 280℃-350℃ and a pressure of 0.05MPa-0.1MPa to generate trichlorosilane and silicon chloride. The reaction chemical formula is 2Si+6HCl=Si HCl 3 +SiCl 4 +3H 2 . Traditional fluidized bed (such as Figure 1 The outer finger-shaped tube is connected and fixed by a pipe clamp and a rib plate, but this connection is prone to abrasion of the finger-shaped tube, and the main abrasion is located in the center area of ​​the second layer of pipe clamp from bottom to top. The main reasons for the abrasion are as follows:

[0003] 1. Because there is a gap between the pipe clamp and the outer finger-shaped tube, vibration is easy to occur, and the abrasion between the pipe clamp and the outer finger-shaped tube is serious, especially the position near the air inlet end of the outer finger-shaped tube, which is eroded by HCl gas and the abrasion is particularly serious;

[0004] 2. The pipe clamp hinders the normal flow of silicon powder and gas, causing the silicon powder to generate a rotating vortex in the 20mm-100mm area below the pipe clamp plate, and continuously abrades the outer finger-shaped tube;

[0005] 3. When the hydrogen chloride (normal temperature) gas rises from the bottom to the 2-4 meter section, the temperature of hydrogen chloride and the activity of silicon powder reach the best, so the reaction is violent at the second layer of pipe clamps, and the pipe clamps and the outer finger-shaped tubes are obviously abraded.

[0006] In summary, the outer finger tubes of the fluidized bed reactor are subject to severe abrasion, resulting in a short service life, generally only 3-8 months; therefore, how to reduce the abrasion of the outer finger tubes of the fluidized bed reactor has always been a difficult problem in the art. Utility Model Content

[0007] The purpose of the utility model is to provide a fixing structure for the end of a finger-shaped tube and a fluidized bed with a longer service life in view of the above-mentioned problems. By optimizing the fixing structure for the end of the finger-shaped tube, the vibration and abrasion of the finger-shaped tube are reduced, thereby achieving the purpose of increasing the service life of the fluidized bed.

[0008] The technical solution adopted by the utility model is as follows: a fixing structure of a finger-shaped tube end portion, comprising a plurality of wear-resistant heads for sealingly connecting with the outer finger-shaped tube end portion by welding, and adjacent wear-resistant heads are connected by rib plates.

[0009] Furthermore, the bottom of the wear-resistant head is conical.

[0010] Furthermore, the wear-resistant head is a solid structure.

[0011] Furthermore, a wear-resistant layer made of wear-resistant material is built-up on the lower side of the rib plate.

[0012] Furthermore, both upper and lower sides of the rib plate have chamfers.

[0013] Furthermore, both ends of the rib plate are welded to the wear-resistant head.

[0014] Furthermore, the top of the wear-resistant head is sealed with a plugging platform, and the outer diameter of the plugging platform matches the inner diameter of the outer finger-shaped tube, and the outer diameter of the wear-resistant head matches the outer diameter of the outer finger-shaped tube.

[0015] A fluidized bed with a long service life comprises a fluidized bed body without a second layer of pipe clamps and the fixed structure, wherein a plurality of external finger-shaped tubes are assembled inside the fluidized bed body, the distribution of wear-resistant heads in the fixed structure matches the distribution of the external finger-shaped tubes, and the seal corresponding to each wear-resistant head is welded to the end of the external finger-shaped tube.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0017] 1. The utility model directly welds the wear-resistant head to the outer finger-shaped tube, and connects the outer finger-shaped tube into a whole through the rib plate to fix all the outer finger-shaped tubes, replacing the fixation of the outer finger-shaped tube by the pipe clamp and the rib plate, which can greatly reduce the vibration of the finger-shaped tube, thereby reducing the abrasion caused by vibration and prolonging the service life of the fluidized bed;

[0018] 2. The utility model needs to lengthen the wear-resistant head to realize direct welding between the wear-resistant head and the outer finger-shaped tube. After the wear-resistant head is lengthened, on the one hand, a position basis is provided for welding the rib plate and the wear-resistant head to ensure that the rib plate can be connected to the wear-resistant head; on the other hand, the service life of the wear-resistant head can be increased to protect the outer finger-shaped tube from being directly washed by HCl gas;

[0019] 3. The rib plate in the utility model is welded and fixed to the wear-resistant head, so as to avoid direct welding of the rib plate with the outer finger-shaped tube, thereby ensuring the service life of the outer finger-shaped tube (direct welding of the rib plate with the outer finger-shaped tube is prone to welding defects, and the outer finger-shaped tube is also prone to being melted through or welded through during the welding process);

[0020] 4. The fluidized bed in the utility model eliminates the second layer of pipe clamps, reduces the obstruction of the pipe clamp disk of the main reaction section to the flow of silicon powder and gas, reduces the generation of vortices, thereby reducing the abrasion of the outer finger-shaped tubes, and prolongs the service life of the fluidized bed. In addition, since there is a fixed structure at the outer finger-shaped end, the stability of the outer finger-shaped tubes is not affected. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be described by way of examples with reference to the accompanying drawings, in which:

[0022] Figure 1 It is a schematic diagram of the structure of a traditional fluidized bed;

[0023] Figure 2 It is a structural schematic diagram of the fluidized bed disclosed in the utility model;

[0024] Figure 3 It is a schematic diagram of the connection structure between the fixing structure and the outer finger-shaped tube disclosed in the utility model;

[0025] Figure 4 It is a structural schematic diagram of the rib plate disclosed in the utility model;

[0026] Markings in the figure: 1-fluidized bed body; 2-external finger-shaped tube; 3-wear-resistant head; 4-rib plate; 41-wear-resistant layer. DETAILED DESCRIPTION

[0027] In the description of the present utility model, it should be noted that if the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when used. It is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0028] In addition, if the terms "horizontal" or "vertical" appear in the description of the present invention, it does not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0029] In the description of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0030] Example 1

[0031] like Figure 2-Figure 4 As shown, a fixing structure for the end of a finger-shaped tube includes a plurality of wear-resistant heads 3 for sealingly connecting to the end of an outer finger-shaped tube 2 by welding. Adjacent wear-resistant heads 3 are connected by rib plates 4, i.e., both ends of the rib plates 4 are welded to the wear-resistant heads 3.

[0032] The wear-resistant head 3 is directly welded to the outer finger-shaped tube 2, and all the outer finger-shaped tubes 2 are fixed by connecting them into a whole through the rib plate 4, replacing the pipe clamp and the rib plate 4 to fix the outer finger-shaped tube 2, which can greatly reduce the vibration of the finger-shaped tube, thereby reducing the abrasion caused by vibration and improving the service life of the fluidized bed; to achieve direct welding of the wear-resistant head 3 and the outer finger-shaped tube 2, it is necessary to lengthen the length of the wear-resistant head 3. After the wear-resistant head 3 is lengthened, on the one hand, a position basis is provided for welding the rib plate 4 and the wear-resistant head 3, ensuring that the rib plate 4 can be connected to the wear-resistant head 3; on the other hand, the service life of the wear-resistant head 3 can be improved, and the outer finger-shaped tube 2 is protected from being directly washed by HCl gas; the middle rib plate 4 is welded and fixed to the wear-resistant head 3, avoiding direct welding of the rib plate 4 and the outer finger-shaped tube 2, ensuring the service life of the outer finger-shaped tube 2, and preventing the rib plate 4 and the outer finger-shaped tube 2 from being directly welded. Welding defects are easily generated when the rib plate 4 is directly welded to the outer finger-shaped tube 2, and the outer finger-shaped tube 2 is also easily melted or welded through during the welding process.

[0033] Example 2

[0034] like Figure 3-4 As shown, based on Example 1, a feasible specific implementation method is further proposed.

[0035] In a feasible implementation manner, the bottom of the wear-resistant head 3 is conical, which, on the one hand, reduces the resistance of the wear-resistant head 3 to the HCl gas; on the other hand, guides the HCl gas to move to the external space of the wear-resistant head 3 and / or the outer finger-shaped tube 2 (HCl gas moves along the conical surface), avoiding the HCl gas from directly acting on the surface of the outer finger-shaped tube 2.

[0036] In a feasible implementation manner, the wear-resistant head 3 is a solid structure, which effectively improves the wear resistance of the wear-resistant head 3 .

[0037] In a feasible implementation manner, a wear-resistant layer 41 made of wear-resistant material is welded on the lower side of the rib plate 4 to improve the ability of the rib plate 4 to withstand HCl gas erosion, thereby increasing the service life of the rib plate 4 and further increasing the service life of the fluidized bed.

[0038] In a feasible implementation manner, both upper and lower sides of the rib plate 4 have chamfers, and the chamfers have the same effect as the bottom of the conical wear-resistant head 3 , both of which are to achieve the purpose of reducing the resistance of the wear-resistant head 3 to HCl gas.

[0039] A feasible implementation method is to provide a sealing platform on the top of the wear-resistant head 3, wherein the outer diameter of the sealing platform matches the inner diameter of the outer finger-shaped tube 2, thereby ensuring that the wear-resistant head 3 can seal the outer finger-shaped tube 2; the outer diameter of the wear-resistant head 3 matches the outer diameter of the outer finger-shaped tube 2, thereby ensuring that the HCl gas can smoothly enter the space where the outer finger-shaped tube 2 is located after passing through the wear-resistant head 3, thereby preventing the end of the outer finger-shaped tube 2 from blocking the HCl gas and causing vibration.

[0040] It should be noted that in the disclosure of the present embodiment, the purpose of setting the technical feature in which the beneficial effect is to reduce the resistance of the wear-resistant head 3 to HCl gas is to further reduce the vibration, that is, to improve the flow capacity of HCl gas and reduce the vibration generated by blocking the HCl gas.

[0041] Example 3

[0042] like Figure 2-Figure 4 As shown, a fluidized bed with a longer service life comprises a fluidized bed body 1 without a second layer of pipe clamps and a fixed structure as described in any one of the implementation modes in Examples 1-2, wherein a plurality of external finger-shaped tubes 2 are assembled inside the fluidized bed body 1, the distribution of wear-resistant heads 3 in the fixed structure matches the distribution of the external finger-shaped tubes 2, and the corresponding seal of each wear-resistant head 3 is welded to the end of the external finger-shaped tube 2.

[0043] In this embodiment, the fluidized bed eliminates the second layer of pipe clamps, thereby reducing the obstruction of the pipe clamp disk of the main reaction section to the flow of silicon powder and gas, reducing the generation of vortices, thereby reducing the abrasion of the outer finger-shaped tube 2, and increasing the service life of the fluidized bed. In addition, due to the existence of the fixed structure, the stability of the outer finger-shaped tube 2 is not affected.

[0044] In this embodiment, a fixing structure is used to fix the outer finger-shaped tube 2 to ensure the stability of the outer finger-shaped tube 2 so that the fixation of the outer finger-shaped tube 2 will not be affected by the absence of a second layer of pipe clamp structure; and the fixing structure has the beneficial effects, and the specific effects are described in Examples 1-2.

[0045] It should be noted that other structures of the fluidized bed body 1 are known to those skilled in the art and will not be specifically described here.

[0046] The present invention is not limited to the above-mentioned specific implementation modes, but extends to any new features or any new combination disclosed in this specification, as well as any new method or process steps or any new combination disclosed.

Claims

1. A fixing structure for the end of a finger-shaped tube, characterized in that: It comprises a plurality of wear-resistant heads (3) for sealingly connecting to the ends of the outer finger-shaped tubes (2) by welding, and adjacent wear-resistant heads (3) are connected by rib plates (4).

2. The fixing structure according to claim 1, characterized in that: The bottom of the wear-resistant head (3) is conical.

3. The fixing structure according to claim 1, characterized in that: The wear-resistant head (3) is a solid structure.

4. The fixing structure according to claim 1, characterized in that: The lower side of the rib plate (4) is built-up with a wear-resistant layer (41) made of wear-resistant material.

5. The fixing structure according to claim 1, characterized in that: The rib plate (4) has chamfers on both the upper and lower sides.

6. The fixing structure according to claim 1, characterized in that: Both ends of the rib plate (4) are welded to the wear-resistant head (3).

7. The fixing structure according to claim 1, characterized in that: The top of the wear-resistant head (3) is sealed with a plugging platform, the outer diameter of the plugging platform matches the inner diameter of the outer finger-shaped tube (2), and the outer diameter of the wear-resistant head (3) matches the outer diameter of the outer finger-shaped tube (2).

8. A fluidized bed with a relatively long service life, characterized in that: It comprises a fluidized bed body (1) without a second layer of pipe clamps and a fixed structure as described in any one of claims 1 to 7, wherein a plurality of external finger-shaped tubes (2) are assembled inside the fluidized bed body (1), the distribution of wear-resistant heads (3) in the fixed structure matches the distribution of the external finger-shaped tubes (2), and the corresponding seal of each wear-resistant head (3) is welded to the end of the external finger-shaped tube (2).

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