《Table 4 Main reactions and kinetic parameters in the char combustion and gasification.》

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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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HCN and NH3 are the main light nitrogen species produced by the pyrolysis of coal，and the ratio between the two species is in close relation to fuel type，pyrolysis temperature and heating rate[59-61].At high heating rates and small particle sizes，HCN is generally the dominant light nitrogen in the devolatilization of bituminous coal[60，62].In this study，the volatile N is assumed to be completely transformed into HCN and NH3 under the conditions of low temperature and reduction atmosphere，and HCN/NH3 partition mole ratio of 7/3 is used as a preliminary test[63，64].The transformation rate of the char N is generally 40%，about80%of which is trans-formed to NO and the residual to HCN and NH3 at the mole ratio HCN/NH3=7/3 too[63-66].Thereby，the transformation route of fuel N is summarized in Fig.2.The relevant reactions including the reduction of NO to N2 are listed as well as corresponding kinetics parameters in Table 5[67-69].