Experiment on NO formation characteristics of char in O2/CO2 atmosphere.

In order to reveal NO formation characteristics and the effect of CO2 concentrated and CO on NO heterogeneous reduction with char during the process of O2/CO2 combustion, the combustion experiments for Shanxi lignite were carried out on a horizontal furnace. The results show that, compared with O2/N2 atmosphere, NO emissions from coal-nitrogen can be effectively suppressed in O2/CO2 combustion conditions. O2/CO2 atmosphere can inhibit converting volatile-nitrogen to NO remarkably, while the conversion of char-nitrogen to NO is relatively less restrained. The conversion of char-nitrogen to NO is significantly promoted with O2 concentration increasing. Char-NO heterogeneous reduction reaction is obviously improved by a moderate amount of CO2 and the promoting effect can be cancelled out to a certain extent by excess of CO2. The effect of CO addition on NO reduction is remarkable. The highest NO reduction efficient is reached when CO concentration is 0.5% ,however, continuing rising of CO concentration can weaken the effect of NO reduction. [ABSTRACT FROM AUTHOR]