Abstract
Two methods for the reduction of nitrous oxide emissions, afterburning and reversed air staging, are investigated in a 12 MW circulating fluidized bed boiler. With afterburning the N 2O emission can be reduced by 90% or more, using an amount of secondary fuel corresponding to 10% of the total energy input. With reversed air staging it is possible to reduce the emission of N 2O to one fourth (25 ppm), without significantly affecting the other emissions. With reversed air staging no secondary air is used in the combustor and an air-ratio of about unity is maintained throughout the combustion chamber. Air for final combustion is added in the cyclone outlet.
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