Process using two-stage boiler injection for reduction of nitrog

Details Process using two-stage boiler injection for reduction of nitrog Process using two-stage boiler injection for reduction of nitrog

1991-10-02

1993-08-31

Heller, Gregory A.

Chemistry of inorganic compounds

Modifying or removing component of normally gaseous mixture

Nitrogen or nitrogenous component

C01B 2100

Patent

active

052406890

ABSTRACT:
This invention relates to methods and apparatus for reducing NOx in combustion effluent gases which comprise a two-stage injection process. NHi precursors (such as liquid-phase urea or ammonium hydroxide, or the like) are injected into the flue gas at temperatures greater than 1400.degree. F. in a first injection zone to reduce NO to nitrogen. This step is followed by injecting a peroxyl initiator, such as a hydrocarbon material (for example, methanol) into the flue gas at temperatures less than 1400.degree. F. to oxidize residual NO to NO.sub.2 in a second injection zone.

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