Hydrogenation reactor

Abstract

The invention discloses a hydrogenation reactor, which comprises a cylinder, a silicon powder blanking pipe and a filter element assembly. The cylinder is vertically disposed, and the lower part and the top part of the cylinder are respectively provided with an intake pipe and an exhaust port. A lower compartment and an upper compartment which are in communication with each other are restricted inthe cylinder, and the upper compartment is communicated with the exhaust port. The silicon powder blanking pipe penetrates from the outside of the cylinder into the lower compartment. One end of thesilicon powder blanking pipe has a silicon powder outlet, which is located in the lower compartment and above the intake pipe. The filter element assembly is embedded in the upper compartment. According to the hydrogenation reactor of the embodiment of the invention, the silicon powder can be effectively prevented from escaping with the gas; and the hydrogenation reactor has the advantages of longrunning time and the like.

Description

technical field [0001] The invention relates to the technical field of hydrogenation reactions, in particular to a hydrogenation reactor. Background technique [0002] The hydrogenation reaction is a gas-solid reaction. As the reaction progresses, the silicon powder particles in the hydrogenation reactor will gradually become finer. When the particles are less than a certain initial fluidization velocity, they will be taken out by the gas and enter the subsequent equipment, blocking the pipeline and equipment, affecting the normal operation of production. [0003] At present, in the polysilicon production process, more than 90% of the polysilicon enterprises use silicon tetrachloride cold hydrogenation technology to treat by-products and convert them into trichlorosilane, the raw material for polysilicon production. Silicon tetrachloride cold hydrogenation technology is to add metallurgical grade silicon powder, hydrogen, and silicon tetrachloride into a cold hydrogenation ...

AI Technical Summary

Problems solved by technology

The main problem of this method is that with the extension of time, more and more fine silicon powder is added to the filter. First, the layer of silicon powder accumulates in the space of the filter element, which easily leads to the breakage of the filter element, resulting in failure of the filter, and the silicon powder is brought into the follow-up equipment. Second, the accumulation of silicon powder is too high, resulting in a large pressure difference in the system. The system needs to stop regularly to release the fine silicon powder in the filter. Third, this part of fine silicon powder cannot be reused, resulting in waste of silicon powder

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