Trichlorosilane synthesis gas gas-solid separating device

Abstract

The invention discloses a trichlorosilane synthesis gas gas-solid separating device used for separating silica powder granules, capable of filtering silica powder granule the grain diameter of which is less than 10 Mum. The trichlorosilane synthesis gas gas-solid separating device comprises a separation vessel and a filter element arranged in the cavity of the separation vessel, the case of the separation vessel is provided with a synthesis gas inlet and a synthesis gas outlet which are communicated with the cavity thereof, and the filter element is in metal sintered type. The metal sintered type filter element has favourable abrasion resistance, thus having longer service life when filtering silica powder granules and reducing filter element replacement cost; and meanwhile, the metal sintered type filter element has favourable absorption performance, can better remove silica powder granule the grain diameter of which is less than 10 Mum and is especially applicable to being used in device for separating silica powder granules.

Description

technical field [0001] The invention relates to a filter structure, in particular to a gas-solid separation device for trichlorosilane synthesis gas for separating silicon powder particles. Background technique [0002] At present, the production process of trichlorosilane generally adopts the fluidized bed method. In the fluidized bed production process, some fine silicon powder will be taken out by the synthesis gas. At present, the fine silicon powder in the syngas is often separated in two stages. The first stage uses a series of multi-stage cyclone separators to separate the particles with a particle size greater than 10um in the silicon powder; the particles with a particle size smaller than 10um use a bag filter. The separation degree of fine silica powder affects the solid content in the synthesis gas condensate—chlorosilane condensate. Since the hardness of silicon powder is close to that of diamond, reaching a Mohs hardness of 7, the solid content in the chlorosi...

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Problems solved by technology

The filter cloth of the filter is made of glass fiber cloth, which has poor wear resistance and is easy to wear; the integral cylindrical structure design requires the entire filter material to be replaced when replacing the filter cloth, and the use cost is high; due to the trichlorohydrogen in the syngas Silicon and synthetic by-products such as polychlorosilane are flammable and explosive substances, and frequent replacement of filter elements can easily lead to safety accidents

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