Abstract
Combustion adjustment tests about air distribution modes were performed on 1 025 t/h boiler for NOx emission controlling. NOx emission was affected by factors such as oxygen content, upper tertiary air, over fire air and secondary air distribution modes. Fuel-NOx raised drastically with the increase of oxygen content. NOx concentration declined with the rise of upper tertiary air ratio. Both average flame temperature and NOx emission concentration decreased inversely with over fire air. Beam waist mode had the lowest NOx emission concentration among different air distribution modes. It emitted less 14.2% NOx than that of balanced air distribution mode. NOx concentration can be reduced 10%-20% by combustion adjustment.
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