Abstract :
Reburning for NO reduction by simulated biomass pyrolysis gas (H2/CO/CH4/C2H2/C2H4) has been studied by using detailed improved kinetic modeling. A reaction set including 66 chemical species and 448 elementary gas-phase reactions was applied. The improved mechanism can reasonably simulate the evolution of the mole fractions of NO and HCN in Dagaut´s experiments. According to this study, HCCO, C and CHi(i=l,2,3) radicals have important effect on NO reduction. The effect of CO on NO reduction is inferior to that of simple hydrocarbons including CH4, C2H2 and C2H4, etc, and CO mostly converts into CO2. H2 plays an important role in accelerating reaction process. NO reduction by biomass pyrolysis gas reburning is primarily through the following sequence: CH4rarrCH3rarrCH2(s)rarrCH2rarrCHrarrC; C2H4rarrCH3,C2H3; C2H3rarrC2H2rarrCH2,HCCO; HCCOrarrCH2(s); C+NOrarrCNrarrNCO; CHi(i=1,2,3)+NOrarrHCNrarrNCO,CN; HCCO+NOrarrHCNOrarrHCN ; NCOrarrHNCO,NH,N2O ; HNCOrarrNH2rarrNH,NNH ; NH,NH2+NOrarrNNHrarrN2; NH2+NOrarrN2 ; N2OrarrN2.
Keywords :
air pollution control; nitrogen compounds; pyrolysis; reaction kinetics; accelerating reaction process; biomass pyrolysis gas; gas-phase reactions; hydrocarbons; kinetic analysis; mole fractions; nitrogen oxide reduction; reburning; Biomass; Chemical analysis; Chemical elements; Chemistry; Fuels; Hydrocarbons; Hydrogen; Kinetic theory; Natural gas; Nitrogen;
