PROCESS AND APPARATUS USING TWO-STAGE BOILER INJECTION FOR REDUCTION OF OXIDES OF NITROGEN

PROCESS AND APPARATUS USING TWO-STAGE BOILER INJECTION FOR REDUCTION OF OXIDES OF NITROGEN

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 fir...

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Bibliographische Detailangaben
1. Verfasser: JONES, DALE G
Format: Patent
Sprache:eng ; fre
Schlagworte:
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Beschreibung
Zusammenfassung: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 NO2 in a second injection zone. WPC:mlm 1825.15