Abstract
A series of experiments were carried out in a drop-tube furnace to investigate the influence of burnout air on NO emission. The experimental results show that burnout air added has a dramatic effect on final NO emission when the reburning zone residence time is not sufficient. Residence time in the reburning zone controls the increase of NO in the burnout zone. This phenomenon becomes more obvious at a higher reburning fuel flow rate. Hence, careful consideration must be given to both stoichiometry and residence time in industrial applications.
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