| 摘要 |
An improved exhaust gas NOx removal system removes NOx from exhaust gas through a catalytic reduction process making use of ammonia or its precursor as a reducing agent. The system includes a vaporizer in which ammonia or its precursor is vaporized, and one or a plurality of nozzles provided in a flue upstream of an NOx removal catalyst layer. The number of nozzles corresponds to a cross-sectional area of the same flue. These nozzles eject the ammonia or its precursor, vaporized by superheated steam within the vaporizer, into the flue. The superheated steam to be used in the vaporizer for evaporating ammonia or its precursor can be taken from the exhaust gas boiler itself in which NOx removal is to be effected.
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