Hydrogen chloride tail gas recovery equipment

Abstract

The invention relates to hydrogen chloride tail gas recovery equipment, which is provided with at least one hydrochloric acid recovery tower and an absorption liquid circulating device, wherein a tail gas inlet is formed on the lower part of each hydrochloric acid recovery tower, and a tail gas outlet is formed at the upper end of each hydrochloric acid recovery tower; a secondary spraying devicefor spraying absorption liquid is arranged in each hydrochloric acid recovery tower and comprises two sprayers which are arranged up and down; a filler layer is arranged below each sprayer; a circulating liquid tank for recovering the absorption liquid sprayed from the secondary spraying devices is arranged on the lower part of each hydrochloric acid recovery tower; and the circulating liquid tanks and the secondary spraying devices are in pipeline communication through the absorption liquid circulating device. The hydrogen chloride tail gas recovery equipment has a novel concept, the hydrochloric acid recovery towers are provided with the secondary spraying devices, so the effect of absorbing hydrogen chloride in recovered tail gas is better, and hydrochloric acid products with utilization value can be obtained; and the hydrogen chloride tail gas recovery equipment is electrically controlled and has a high automation degree, and the running cost is far lower than that of a hydrogen chloride tail gas treatment tower.

Description

technical field [0001] The invention relates to the technical field of tail gas recovery and treatment equipment, in particular to a hydrogen chloride tail gas recovery equipment, which is used to absorb hydrogen chloride gas in the tail gas discharged during the polysilicon production process, and directly convert the tail gas containing hydrogen chloride into a valuable by-product hydrochloric acid equipment. Background technique [0002] A large amount of tail gas is produced during the polysilicon production process, and the tail gas contains a large amount of hydrogen chloride. The traditional tail gas treatment method is to neutralize the tail gas with an alkaline solution. This process will inevitably produce a huge amount of salty wastewater that needs further treatment, otherwise it will cause Serious environmental pollution problem. Moreover, the traditional tail gas treatment method also consumes a high cost of chemicals. How to separate or transform the hydroge...

AI Technical Summary

Problems solved by technology

This kind of hydrochloric acid recovery tower has a simple structure, can remove most of the hydrogen chloride gas in the tail gas, and has low operating costs, but there is still residual hydrogen chloride gas in the tail gas, and direct discharge still has adverse effects on the environment

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