《Table 9 Reduction of NO by different species in the DC mode.》

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《Effects of High-temperature Char Layer and Pyrolysis Gas on NOx Reduction in a Typical Decoupling Combustion Coal-fired Stove》

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As shown in Table 9，the NO emission only produced from the redox reactions of HCN and NH3 is called initial NO emission（e.g.，494.5 mg/m3）in this study.When the reduction effects of CO，CH4 and char are introduced into the simulation successively and separately，the NO emission decreases to 424.0 mg/m3，352.4 mg/m3，and245.1mg/m3 respectively，corresponding to the reducing rates of 14.3%，28.9%，and 50.5%of CH4，CO and char.If the reactions of NO with CO，CH4 and char are incorporated in turn into the modeling scheme，the cumulative reduction rates of CH4+CO，CH4+char，CO+char and CH4+CO+char are high up to 32.8%，53.1%，59.6%and 66.4%respectively，and the final emission of NO decreases to 166.2 mg/m3 under the condition of stable combustion.It is clear that the reducing ability increases gradually from CH4，CO to char，but the combined reducing ability of them cannot be determined by a simple addition，thus should be paid attention to in the design and development of coal-fired domestic stoves.