Protection device for fluidized bed feed pipe in polycrystalline silicon production
By designing a fluidized bed feed pipe protection device for polysilicon production, the pipe body and flange ring made of forged steel is solved, the problem of silicon powder wear and erosion is extended, and the service life of the equipment is reduced and safety risks are reduced.
Patent Information
- Application Number
- CN202420603211.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-26
- Publication Date
- 2025-03-07
- Estimated Expiration
- 2034-03-26
AI Technical Summary
In polysilicon production, when silicon powder flows at high speed in the fluidized bed, it causes wear to the feed pipe and the equipment body, resulting in a shortening of the service life of the equipment and a fire and safety hazard.
A protective device is designed, including a circular tube body and flange ring with a length exceeding the fluidized bed feed tube. The tube body and flange ring are made of forged steel, with a roughness of less than 0.8, sealed by a metal sealing gasket, and the tube body is inserted into the feed tube and fixed by double-head bolts.
Effectively prevent silicon powder wear and erosion, extend the service life of fluidized bed equipment, reduce safety risks, and is simple to replace and low cost.
Smart Images
Figure CN222574337U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of polysilicon production equipment, in particular to a protective device for a fluidized bed feed pipe in polysilicon production. Background Art
[0002] In the field of polysilicon production, cold hydrogenation devices are now mostly used to mix silicon powder, catalyst, hydrogen, and chlorosilane, and then blown into the fluidized bed for reaction, wherein the silicon powder enters the fluidized bed from the middle or bottom of the fluidized bed. Due to the high internal pressure and high temperature of the fluidized bed, the silicon powder is blown into the fluidized bed through a purge device. The hard silicon powder particles flow in the feed pipe at high speed for a long time, which will cause wear and tear on the wall of the silicon powder feed pipe of the fluidized bed, thinning the wall, and reducing the strength of the parent material near the feed port. In severe cases, it will cause equipment cracking, causing high-pressure hydrogen leakage, fire, personal injury and property loss.
[0003] At present, most methods used to increase the service life are to thicken the feed pipe during the production of the fluidized bed or to line the inside of the feed pipe with ceramic tubes. However, although the first method of thickening the feed pipe prolongs the service life, there is still a limit to the extension time and the replacement cost after wear is high; the second method of lining with ceramic tubes, because the lining ceramic tubes are brittle, the temperature of the equipment body rises / falls by more than 500℃ in a short period of time during the heating and cooling process of the equipment body during startup and shutdown, the metal material of the equipment body expands and contracts, and the lining material is at risk of cracking. Once the protection is lost, the pipeline wear will be aggravated. Utility Model Content
[0004] In view of this, the utility model provides a protective device for a fluidized bed feed pipe in polysilicon production, the main purpose of which is to prevent silicon powder from wearing and eroding the fluidized bed feed pipe and the equipment body near the feed pipe during the feeding process, thereby extending the service life of the fluidized bed equipment.
[0005] In order to achieve the above purpose, the utility model mainly provides the following technical solutions:
[0006] The embodiment of the utility model provides a protective device for a fluidized bed feed pipe in polysilicon production, comprising: a pipe body;
[0007] The tube body is a circular tubular structure; the length of the tube body is greater than the length of the fluidized bed feed pipe;
[0008] A flange ring is fixedly arranged at one end of the tube body; the flange ring is coaxially arranged with the tube body; the inner diameter of the flange ring is the same as the inner diameter of the tube body;
[0009] Both ends of the flange ring have ring connection surfaces;
[0010] The ring connection surface is provided with an annular gasket groove;
[0011] A metal sealing gasket is arranged in the annular gasket groove.
[0012] Furthermore, the tube body and the flange ring are integrally arranged.
[0013] Furthermore, the roughness of the inner wall of the tube body is less than 0.8.
[0014] Furthermore, the tube body is made of forged steel.
[0015] Furthermore, the flange ring is made of forged steel.
[0016] By means of the above technical solution, the protective device for the fluidized bed feed pipe in the production of polysilicon of the utility model has at least the following advantages:
[0017] It can prevent silicon powder from wearing and eroding the feed pipe of the fluidized bed and the equipment body near the feed pipe during the feeding process, thereby extending the service life of the fluidized bed equipment, facilitating replacement, and reducing safety risks.
[0018] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the utility model in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS
[0019] Figure 1 A schematic diagram of a protection device for a fluidized bed feed pipe in polysilicon production provided by an embodiment of the utility model;
[0020] Figure 2 A schematic diagram of the connection between a protection device for a fluidized bed feed pipe in polysilicon production and a feed pipe provided by an embodiment of the utility model;
[0021] Figure 3 Schematic diagram of a fluidized bed.
[0022] As shown in the figure:
[0023] 1 is the tube body, 2 is the flange ring, 3 is the annular gasket groove, 4 is the feed pipe, and 5 is the fluidized bed. DETAILED DESCRIPTION
[0024] In order to further explain the technical means and effects adopted by the utility model to achieve the predetermined utility model purpose, the specific implementation methods, structures, features and effects of the utility model application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.
[0025] like Figures 1 to 3 As shown, an embodiment of the utility model proposes a protective device for a fluidized bed feed pipe in polysilicon production, comprising: a tube body 1; the tube body 1 is a circular tubular structure; the length of the tube body 1 is greater than the length of the feed pipe 4 of the fluidized bed 5, so that the tube body 1 can extend into the fluidized bed 5 equipment to protect the equipment body near the feed pipe 4. A flange ring 2 is fixedly arranged at one end of the tube body 1; preferably, the tube body 1 and the flange ring 2 are integrally arranged and can be integrally formed and processed; of course, they can also be fixed by welding. The flange ring 2 is coaxially arranged with the tube body 1; the inner diameter of the flange ring 2 is the same as the inner diameter of the tube body 1; both ends of the flange ring 2 have a ring connection surface; one end is used to connect with the feed pipe 4 of the fluidized bed 5, and the other end is used to connect to the feeding equipment such as purging. An annular gasket groove 3 is arranged on the ring connection surface for clamping a metal sealing gasket; a metal sealing gasket is arranged in the annular gasket groove 3 to achieve sealing at the connection.
[0026] An embodiment of the utility model proposes a protective device for a fluidized bed feed pipe in polysilicon production, which can prevent silicon powder from wearing and eroding the feed pipe 4 of the fluidized bed 5 and the equipment body near the feed pipe 4 during the feeding process, thereby extending the service life of the fluidized bed 5 equipment, facilitating replacement, and reducing safety risks.
[0027] As a preference of the above embodiment, the roughness of the inner wall of the tube body 1 is less than 0.8, so as to increase the surface smoothness of the inner wall of the tube body 1 and increase the service life.
[0028] As a preferred embodiment of the above, the tube body 1 is made of forged steel, has high strength, is wear-resistant in a high temperature environment, and has a similar expansion coefficient to that of the feed pipe 4 of the fluidized bed 5 .
[0029] As a preferred embodiment of the above, the flange ring 2 is made of forged steel with high strength, can be wear-resistant in a high temperature environment, and has a similar expansion coefficient to that of the feed pipe 4 of the fluidized bed 5 .
[0030] An embodiment of the utility model provides a protective device for a fluidized bed feed pipe in polysilicon production. When in use, the protective device is inserted into a feed pipe 4 of a fluidized bed 5 and fixed to the feed pipe 4 by stud bolts. The replacement is simple, fast and low-cost.
[0031] In the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] The standard parts used in the utility model can all be purchased from the market, and special-shaped parts can be customized according to the instructions and the drawings. The specific connection methods of each part adopt the conventional means such as mature bolts, rivets, welding, etc. in the existing technology. The machinery, parts and equipment all adopt the conventional models in the existing technology, and the circuit connection adopts the conventional connection method in the existing technology, which will not be described in detail here.
[0033] The above is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.
Claims
1. A protective device for a fluidized bed feed pipe in polysilicon production, characterized in that: Includes: pipe body; The tube body is a circular tubular structure; the length of the tube body is greater than the length of the fluidized bed feed pipe; A flange ring is fixedly arranged at one end of the tube body; the flange ring is coaxially arranged with the tube body; the inner diameter of the flange ring is the same as the inner diameter of the tube body; Both ends of the flange ring have ring connection surfaces; The ring connection surface is provided with an annular gasket groove; A metal sealing gasket is arranged in the annular gasket groove.
2. The protective device for a fluidized bed feed pipe in polysilicon production according to claim 1, characterized in that: The pipe body and the flange ring are integrally arranged.
3. The protective device for a fluidized bed feed pipe in polysilicon production according to claim 1, characterized in that: The roughness of the inner wall of the tube body is less than 0.
8.
4. The protective device for a fluidized bed feed pipe in polysilicon production according to claim 1, characterized in that: The tube body is made of forged steel.
5. The protective device for a fluidized bed feed pipe in polysilicon production according to claim 1, characterized in that: The flange ring is made of forged steel.