An improved limestone/lime-gypsum wet flue gas desulfurization process

Abstract

The invention discloses an improved limestone / lime-gypsum wet flue gas desulphurization technology. Limestone or a soda lime slurry is adopted as an absorption slurry, and sulfur dioxide flue gas absorption and oxidation reaction are carried out in an oxidation desulphurization device to obtain a gypsum product. The technology is mainly characterized in that the slurry supply position is changed; the oxidation tube layout is improved, and the oxidation gas quantity is greatly improved; the running height of a slurry pool is improved, and the density of the slurry is adjusted; and the pH value running parameter of an absorption tower is adjusted. The improved technology effectively prevents slurry poisoning, realizes preparation of highly pure gypsum through continuous and efficient oxidation of the limestone / lime-gypsum slurry, avoids absorption tower slurry poisoning, and greatly improves the quality of gypsum completely reaching commercial standards.

Description

technical field [0001] The invention relates to an improved limestone / lime-gypsum wet flue gas desulfurization process, in particular to a method for preventing wet desulfurization slurry poisoning, and belongs to the technical field of wet desulfurization. Background technique [0002] The limestone / lime-gypsum wet flue gas desulfurization process uses cheap and easy-to-obtain limestone or salty ash as the desulfurization absorbent. The limestone is crushed into powder and mixed with water to make an absorption slurry. When lime is used as absorbent, lime powder is mixed with water to make absorption slurry. In the absorption tower, the absorption slurry is contacted and mixed with the flue gas, and the sulfur dioxide in the flue gas reacts with the calcium carbonate in the slurry and the oxidized air blown in, and the final reaction product is gypsum. At the same time remove some other pollutants in the flue gas, such as dust, HCL, HF, SO 3 . The desulfurized flue gas i...

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Problems solved by technology

[0018] In view of the limestone / lime-gypsum wet flue gas desulfurization process in the prior art, the absorbing slurry is easily poisoned, the desulfurization efficiency is low, and the obtained gypsum product is impure. The purpose of the present invention is to provide a method that can effectively prevent Absorb slurry poisoning and realize continuous and efficient oxidation of limestone-gypsum desulfurization slurry to prepare high-purity gypsum. This method not only eliminates slurry poisoning in the absorption tower, but also greatly improves the gypsum product, which fully meets commercial standards.

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