APPARATUS FOR TREATING DISCHARGE GAS, SYSTEM FOR TREATING DISCHARGE GAS, AND SYSTEM FOR CONTROLLING ABILITY TO OXIDIZE MERCURY IN DISCHARGE GAS

摘要

An apparatus for discharge gas treatment is provided which includes a denitration catalyst layer (13) in which nitrogen oxides (NOx) contained in a discharge gas (12) discharged from a boiler (11) are removed and hydrogen chloride as a chlorinating agent is sprayed in the discharge gas (12) to oxidize mercury (Hg).  The apparatus is equipped with: a first monitoring unit (31) which determines at least one of the temperature of the discharge gas, flow rate distribution of the discharge gas, and hydrogen-chloride concentration distribution on the inlet side of the denitration catalyst layer (13); a second monitoring unit (32) which measures the amount of mercury contained in the discharge gas, on the outlet side of the denitration catalyst layer (13); and a hydrogen-chloride spray rate control unit (33) which regulates the amount of hydrogen chloride to be sprayed, based on the results sent from the first monitoring unit (31) and the second monitoring unit (32).