Process and apparatus using two-stage boiler injection for...

Details Process and apparatus using two-stage boiler injection for... Process and apparatus using two-stage boiler injection for...

B - Operations, Transporting

01

D

23/353, 23/391

B01D 53/34 (2006.01)

Patent

CA 2022167

-25- Abstract Of The Disclosure 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°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°F to oxidize residual NO to NO2 in a second injection zone. WPC:mlm 1825.15

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