Patent ID: 7722844

Claim:
An exhaust smoke denitrating apparatus which eliminates nitrogen oxides in an exhaust gas, for which an ammonia injection unit and a denitration catalyst layer are disposed on a passage of an exhaust gas discharged from a gas turbine and, wherein the ammonia injection unit comprises: an exhaust gas supply passage that makes a part of the exhaust gas from the gas turbine exhaust gas passage flow; an ejector that extracts the exhaust gas, provided at a front end of the exhaust gas supply passage; a compressed air blower that supplies compressed air to the ejector; a mixed gas supply passage that supplies a mixed gas of an exhaust gas and air obtained by the ejector; an ammonia water supply passage that supplies ammonia water; an ammonia water evaporator that mixes the mixed gas of an exhaust gas and air from the mixed gas supply passage and the ammonia water from the ammonia water supply passage and evaporates the ammonia water; an ammonia-containing gas supply passage that supplies an ammonia-containing gas obtained by the ammonia water evaporator to the gas turbine exhaust gas passage on a front stream side of the denitration catalyst layer; and an ammonia-containing gas injection nozzle provided at a front end of the ammonia-containing gas supply passage.