| 摘要 |
PURPOSE:To effectively remove nitrogen oxides (NOx) from an effluent gas, by allowing an excess reduing agent to have been adsorbed in advance to a catalyst filled in a denitrator in the course of an effluent gas duct. CONSTITUTION:A combustion waste gas effluent from a boiler 6 is denitrated with a reducing agent introudced from an introduction pipe 7 installed on the upstream of a denitrator 8 located in the course of an effluent gas duct 4. Denitration is accelerated by a catlayst 9 filled in the denitrator 8 to remove NOx contained in the effluent gas. At that time, the start time of introduction of said agent is selected from before stop of the feed of the effluent gas to the denitrator 8 at latest to the same time as start of the denitrator 8, thus allowing an excess of the reducing agent to have been adsorbed to the catalyst 9 in advance, and consequently, NOx to be effectively removed. |
