REGENERATING TREATMENT OF DENITRIFICATING CATALYST

摘要

PURPOSE:To regenerate a catalyst efficiently as well as economically by a method wherein the filling of a catalyst is carried out under a condition while a catalyst is filled and NH3 generated by adding an alkali to a water washing treating liquid is reused as a reducing agent of denitrificating reaction. PURPOSE:A catalyst is washed by water by spraying water directly to a catalyst through a water injecting pipe 12 from an upper portion of a catalyst reactor 2 to remove a poisoning component (SO4<2->, NH4<+> or soots) and said catalyst is regenerated. The water washing treatment after water washing is stored once in a water washing tank 14 and the portion thereof is recirculated and reused to wash a catalyst through a recirculating pump 15 and the residual portion after water washing treatment is sent into an exhaust water treating tank 17. In the exhaust water treating tank 17, an alkali is added to carry out the pH adjustment and said exhaust water is neutralized. Then, the NH3 generated in this time is collected in an NH3 tank 11 through an NH3 removing pipe 20 and, after introduction, is reused as a reducing agent.