METHOD AND APPARATUS FOR TREATING ACIDIC TAIL GAS BY USING AMMONIA PROCESS FLUE GAS

摘要

A method for treating acidic tail gas by using ammonia process flue gas comprises the following steps: 1) controlling a sulfur dioxide concentration of tail gas entering an absorption tower at a level of less than or equal to 30000 mg/Nm3; 2) disposing process water in an absorption tower entrance flue or in the absorption tower or cooperating with a ammonium sulphate solution to perform spray cooling; 3) disposing an oxidation section in the absorption tower, and disposing an oxidation distributor at the oxidation section to implement oxidation of a desulfurized absorption liquid; 4) disposing an absorption section in the absorption tower, and using an absorption liquid distributor in the absorption section to implement desulfurization and spray absorption by means of an ammonia-contained absorption liquid, ammonia-contained absorption liquid being is fed through an ammonia storage groove; 5) disposing a water washing layer at an upper part of an absorption section in the absorption tower, washing, by the water washing layer, the absorption liquid in the tail gas and reducing the absorption liquid escape; and 6) setting a demister at the upper part of the water washing layer in the absorption tower to control the mist drop content in the purified tail gas. Because a desulfurization technology integrating the Claus sulfur recovery and ammonia process desulfurization is used in the coal chemical industry, the investment cost of the after-treatment can be reduced, the process is simpler, and environmental protection treatment of a factory forms an intensive advantage.