REMOVAL OF MERCURY IN EXHAUST GAS

摘要

PURPOSE:To efficiently remove Hg and Cl2, by bringing Hg-containing exhaust gas into contact with a washing solution containing hypochlorite and subsequently with cooling water having a reducing agent reacting with Cl2 added thereto. CONSTITUTION:Hg-containing exhaust gas enters a precooling part 3 to be cooled by the NaClO4 washing solution sprayed from a nozzle 4 and subsequently enters a washing tower 1 to reach a washing part 6 where a NaClO4 washing solution is sprayed to the exhaust gas from the second nozzle 5 to absorb and remove Hg. Subsequently, the exhaust gas enters a dehumidifying cooling part 9 through a mist separator 7 and cooling water containing a reducing agent reacting with Cl2 such as sulfite or thiosulfate is sprayed to the exhaust gas from the third nozzle 8 to remove Cl2 in the gas while the treated gas is discharged through a mist separator 12.