Patent ID: 9573095
Date: 2017-02-21
CPC Classifications: B01D

Claim:
1. A flue gas treatment apparatus for removing sulfur contents contained in combustion flue gas, comprising: treatment agent feeding means for feeding a treatment agent into a flue through which the combustion flue gas flows; temperature decreasing means for cooling the combustion flue gas to which the treatment agent has been fed to condense SO an electric dust collection apparatus provided in a flue arranged on a downstream side of the temperature decreasing means in a direction of flow of flue gas; a desulfurization apparatus based on a lime-gypsum process, provided downstream of the electric dust collection apparatus in a direction of flow of the flue gas; and circulation means for feeding a portion of dust particles recovered by the electric dust collection apparatus into a flue arranged upstream of the temperature decreasing means in the direction of flow of the flue gas for circulated use of the portion of the dust particles as the treatment agent; and control means for controlling an amount of the dust particles to be disposed of, an amount of the dust particles to be circulated for reuse, and an amount of the treatment agent to be additionally fed so as to satisfy, at a timing (t), the following expressions (I): wherein D(t) denotes an amount of the dust particles to be disposed of, of the dust particles recovered by the electric dust collection apparatus, Z(t) denotes the total amount of the dust particles recovered by the electric dust collection apparatus, X