EXHAUST GAS TREATMENT SYSTEM OF COAL FIRED BOILER

摘要

PROBLEM TO BE SOLVED: To provide an exhaust gas treatment system of a coal fired boiler efficiently removing mercury in the exhaust gas from the coal fired boiler.

SOLUTION: The exhaust gas treatment system is provided with: a denitration device removing nitrogen oxides in the exhaust gas from the coal fired boiler; an air preheater recovering heat in the gas after nitrogen oxides removal; an electrostatic precipitator removing soot and dust in the gas after heat recovery; a gas-liquid contact type desulfurizer removing sulfur oxides in the gas after dust removal by the lime-gypsum method and mercury oxide; and a chimney discharging the gas which has undergone desulfurization to the outside. Coal fed as fuel having a mole ratio of mercury (Hg)/sulfur (S) of 1.3×10-6or less is used for power generation.

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