Abstract
A simple heuristic model is proposed to explain the effect of devolatilization on both coal nitrogen conversion and NO formation. The model is cast into three temperature regimes, the intermediate regime II being initiated at T $ ̆ 1100 K . Regime II represents pyrolysis of repolymerized volatiles and thus accounts for the effects of temperature and temperature history on fuel nitrogen conversion. Based on this interpretation, NO formation results from volatiles combustion at high temperatures and char combustion at low temperatures ( T $ ̌ 1100 K ), in agreement with recent experimental data.
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