Patent ID: 7651389

Claim:
An exhaust smoke processing system comprising an air preheater for heating combustion air by exhaust smoke discharged from a boiler, a heat recoverer for heating heat medium by exhaust smoke discharged from the air preheater, a dust collector for collecting soot and dust in exhaust smoke discharged from the heat recoverer, a wet-type exhaust smoke processing apparatus for wet-type processing exhaust smoke discharged from the dust collector, a reheater for heating exhaust smoke discharged from the wet-type exhaust smoke processing apparatus by the heat medium, and a heat medium circulation pipe passage for circulating the heat medium between the reheater and the heat recoverer, and a measuring means which measures a mercury concentration in exhaust smoke discharged from any one or more of the dust collector, the wet-type exhaust smoke processing apparatus and the reheater, the heat medium circulation pipe passage being provided with temperature control means which adjust the temperature of exhaust smoke at an outlet of the heat recoverer such that the mercury concentration falls within a predetermined range.