Fumed silica tail gas treatment system and treatment method thereof

Abstract

The invention discloses a fumed silica tail gas treatment system and a treatment method thereof. The system comprises a bag-type dust collector, a synthesis furnace, a cooling device, a drying tower,a gas compressor, a high-pressure buffer tank and a pressure swing adsorption tower group which are connected in sequence. Toxic chlorine in the tail gas is completely converted into hydrogen chloridegas in a mode of mixed combustion of the tail gas, the chlorine and excessive hydrogen at high temperature, then the high-concentration compressed hydrogen chloride gas is separated through the stepsof dehydration, pressure swing adsorption and the like, and meanwhile, the emptied tail gas is only nitrogen and oxygen. Compared with the prior art, the method has the following advantages: the discharged tail gas cannot generate environmental pollution, and meanwhile, a large amount of pickling waste liquid cannot be generated, so that the environmental protection pressure of an enterprise is greatly reduced; and the product of the invention is hydrogen chloride gas, and compared with hydrochloric acid with unstable concentration, the hydrogen chloride gas has higher economic value and useflexibility, and the economic benefit of enterprises can be improved.

Description

technical field

[0001] The invention relates to the technical field of polysilicon production, in particular to a gas phase white carbon black tail gas treatment system and a treatment method thereof. Background technique

[0002] The current gas-phase silica production process will produce a large amount of tail gas containing hydrogen chloride gas that needs to be treated. In the prior art, the following steps are generally used for the above-mentioned tail gas: 1. The tail gas of gas-phase silica is sprayed with hydrochloric acid to remove the tail gas 2. The absorption of hydrogen chloride in the tail gas is generally divided into a multi-stage packed absorption tower that uses dilute hydrochloric acid to absorb hydrogen chloride; 3. The tail gas is washed with water, and the water washing tower uses water as the absorbent to absorb hydrogen chloride; 4. The alkali washing tower uses hydrogen oxidation Sodium is used as an absorbent to absorb chlorine in the tail gas and...

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