Mechanism of NO reduction and regeneration in ammonia reburning process
Aiming at the application background of ammonia reburning technology,the chemical reaction kinetics simulation of ammonia reburning was conducted under NO/O2/H2O/N2 atmosphere in the PFR reactor model by using Chemkin software.The effects on rebuming performance were investigated and revealed of temperature(1173～1573K),oxygen concentration(0～4％)and reburning ratio(1％～30％)by Zhang mechanism of ammonia reactions.The results showed that the denitration efficiency of ammonia reburning was remarkable in the range of the study range.The efficiencies could touch over 97％and it retained more than 80％in the temperature window of 1350～1469K.It was founded by an analyse from the perspective of reaction paths that the process of ammonia reburning comprised of the NO reduction region,equilibrium region and NO regeneration region.The NO regeneration region appeared visibly when the oxygen concentration was higher than 1.5％.Moverover the higher the oxygen concentration,the greater the rebound of NO and the higher the final NO concentration.The reburning ratio was preferable in the range of 10％±3％balancing between the denitration efficiency and the unreacted ammonia.
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