Silica powder drying and nitrogen recycling device

Abstract

The invention discloses a silica powder drying and nitrogen recycling device which comprises a silica powder dryer, wherein an air inlet, an air outlet, a feed port and a discharge port are formed inthe silica powder dryer, the recycling device further comprises a filter, a gas-liquid separator, a dehydration prying block and a nitrogen heater, the filter is connected with the silica powder dryer, the gas-liquid separator is connected with the filter, the dehydration prying block is connected with the gas-liquid separator, the nitrogen heater is connected with the dehydration prying block which comprises two towers filled with adsorbents, the two towers perform drying and recycling alternatively, an air inlet, an air outlet, a feed port and a discharge port are formed in the filter, the air outlet of the silica powder dryer is connected with the air inlet of the filter, the discharge port of the filter is connected with the silica powder dryer, the air exhausted by the air outlet of the filter is fed into the gas-liquid separator, the air exhausted from the gas-liquid separator is fed into the dehydration prying block, the dried air dried by the dehydration prying block is fed into the nitrogen heater, and nitrogen heated by the nitrogen heater is fed into the air inlet of the silica powder dryer.

Description

technical field [0001] The invention relates to a silicon powder drying and nitrogen recovery device, which is mainly used for high-temperature drying of raw material silicon powder in the synthesis of trichlorosilane of polycrystalline silicon, and belongs to the technical field of silicon powder drying. Background technique [0002] Today, when the world is plagued by more and more serious environmental pollution problems, the importance of environmental protection has gradually been recognized and paid attention to by the society. Photovoltaic power generation, as a clean and renewable energy source, has extensive and special effects on the whole society. Polysilicon is the basic material for the electronics industry and solar photovoltaic industry. Trichlorosilane is the main raw material for the production of polysilicon, and silicon powder is an important raw material for the production of trichlorosilane. Trichlorosilane is generally produced by the reaction of silico...

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Problems solved by technology

[0004] The object of the present invention is to provide a kind of silicon powder drying and nitrogen gas recovery device, to solve the technical problems of incomplete silicon powder recovery and nitrogen waste when silicon powder in the prior art is dried

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