A fluidized bed reactor

CN224442966UActive Publication Date: 2026-07-03SHAANXI NON FERROUS TIAN HONG REC SILICON MATERIAL CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
SHAANXI NON FERROUS TIAN HONG REC SILICON MATERIAL CO LTD
Filing Date
2025-07-11
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

In existing fluidized bed reactors, the silicon carbide lining is susceptible to impurity elements that diffuse into the granular silicon under high temperature and vibration conditions, leading to product contamination. Furthermore, the uneven deposition of silicon aerosol particles on the inner wall of the lining makes it impossible to completely isolate impurity elements, thus affecting product quality and economic efficiency.

Method used

In a fluidized bed reactor, a liner coated with high-purity silicon carbide is used, and the liner is connected to the metal shell through an air cushion layer and a metal expansion joint to form a closed and clean production space. Chemical vapor deposition technology is used to improve the purity and bonding strength of the liner and isolate the diffusion of impurity elements.

Benefits of technology

It effectively improves the quality of granular polycrystalline silicon products, reduces impurity contamination, enhances product purity and production stability, reduces the risk of metal impurity escaping, and improves the economics of the fluidized bed process.

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Abstract

The utility model discloses fluidized bed reactor, including inner lining, coating, metal shell, metal inner shell, metal expansion joint and heat source, wherein, the inner lining is coated with coating, is placed in the metal inner shell, and the annular space is had between the inner lining and metal inner shell, metal expansion joint is connected to the top of inner lining, the top of metal shell respectively, metal inner shell is placed in the metal shell, and the clearance is had between metal inner shell and metal shell, and the heat source is configured in the clearance, the top seal head, bottom seal head are provided with respectively in the upper and lower surface of metal shell, and the upper and lower surface of metal inner shell is not closed respectively. Thus the utility model can reduce or eliminate the impurity pollution of granular polycrystalline silicon, and effectively improve the quality of granular polycrystalline silicon product.
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