APPARATUS FOR TREATING DISCHARGE GAS AND SYSTEM FOR TREATING DISCHARGE GAS

摘要

An apparatus for discharge gas treatment (10) having a denitration catalyst layer (13) which removes NOX from a discharge gas (12) and in which HCl is sprayed in the discharge gas (12) to oxidize mercury.  The apparatus has a spiral-flow generation member (30A) disposed on an inlet (13a) side of the denitration catalyst layer (13).  The member (30A) is constituted of: a spiral-flow generation member main body which has been partitioned so as to correspond to individual passages of the denitration catalyst layer (13); and a plurality of spiral-flow generation blades which have been disposed on the inner walls of each of the separated chambers and cause a turbulent flow.  This configuration changes the flow of the discharge gas (12), which is a laminar flow in a flue (19), into a spiral flow inside the denitration catalyst layer (13).  The time period of contact of the discharge gas (12) with the denitration catalyst can hence be prolonged to improve the efficiency of the oxidation reaction of the mercury contained in the discharge gas (12) with the denitration catalyst.