Wear-preventive low-resistance high-efficiency Venturi scrubber for cold hydrogenation process

Abstract

The invention provides a wear-preventive low-resistance high-efficiency Venturi scrubber for a cold hydrogenation process. The Venturi scrubber is characterized in that the Venturi scrubber comprises a vertical tubular shell and a spraying device; the shell comprises, from top to bottom, a gas inlet, a receiving section, a mixing section and a gas outlet which are successively connected; the diameter of the receiving section is greater than the diameter of the mixing section; the spraying device comprises a washing liquid pipe and three nozzles arranged at the receiving section; the washing liquid pipe is communicated with external washing liquid and comprises three outlets, wherein one of the outlets is formed in the central axis of the upper part of the receiving section, the other two outlets are symmetrically located in the lower part of the receiving section and the openings of the other two outlets are arranged along a horizontal direction; and each outlet is provided with one nozzle. According to the invention, through bumping between washing liquid sprayed by the nozzle at the upper part and washing liquid sprayed by the nozzles at the lower part, reaction gas undergoes adequate cooling and dedusting; and the washing liquid is employed at the inlet for capturing silicon powder particles, so impact wearing of the shell by the silicon powder particles is reduced; and the receiving section and the mixing section are provided with throats, so dedusting efficiency is improved by changing the flow velocity of the reaction gas.

Description

technical field [0001] The invention relates to a Venturi scrubber applied to polysilicon cold hydrogenation process. Background technique [0002] At present, the mainstream polycrystalline hydrogenation process is divided into thermal hydrogenation process and cold hydrogenation process. The cold hydrogenation process has a wider development space because of its lower energy consumption than the thermal hydrogenation process. However, the cold hydrogenation process is a relatively new process. The realization of the process makes the reaction gas contain fine silicon powder. If the silicon powder is not treated, it will block and wear subsequent equipment and pipelines. Therefore, it is necessary to reduce the temperature of the reaction gas. At the same time, the fine silicon powder entrained in the reaction gas is removed, but the existing dust removal unit Venturi scrubber cannot meet the requirements. Contents of the invention [0003] The object of the present inve...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide an anti-wear, low-resistance and high-efficiency venturi scrubber for cold hydrogenation process, which solves the technical problem that the venturi scrubber of the existing dust removal unit cannot remove the fine silicon powder entrained in the reaction gas