Abstract: An air ammonia heater and vaporization chamber system utilizing a contiguous vaporization chamber having an inlet for receiving dilution air, which is passed across at least one heating element integrated into the vaporization chamber to heat and pre-heat the vaporization chamber. Aqueous or anhydrous ammonia is injected from at least one ammonia injector, which is integrated into the vaporization chamber, into the heated dilution air. The heated ammonia/air mixture may then be passed through a bed of packing prior to being released from the vaporization chamber. The bed of packing maintains the heated, homogenous ammonia/air mixture at a minimum temperature of 350° F. to ensure the air/ammonia mixture does not condense. The air ammonia heater and vaporization chamber system may be used in the vaporization and bleeding of ammonia with air for NOx reduction in the flue gas from heat recovery steam generation systems, packaged boilers, simple cycle catalyst systems or fired heaters.

Abstract: A multi-bed selective catalytic reduction system comprising a gas input duct, a first ammonia injection grid assembly located downstream from the gas input duct, a first selective catalytic reduction catalyst assembly located downstream from the first ammonia injection grid assembly, a second ammonia injection grid assembly located downstream from the first selective catalytic reduction catalyst assembly, a second selective catalytic reduction catalyst assembly located downstream from the second ammonia injection grid assembly, and an exhaust stack located downstream from the second selective catalytic reduction catalyst assembly.