Z. Zhao, B. Li, and D. Cang (PRC)
Modelling, Nitrous oxide, Flat flame, High temperature air combustion
A study of mathematical modelling of combustion and nitrous oxide Emissions of flat flame with high-preheated air was performed. The reaction rates of combustion were calculated basing on the eddy-dissipation-concept. This model accompanied with thermal-NO model was used to predict nitrous oxide formation and emissions. A hybrid method combined heat flux method with Monte-Carlo method was used for modelling thermal radiation. The predicted results were compared with experimental values. The combustion characteristics of flat flame with high preheated air was compared with normal flat flame. The effect of flue gas recirculation on nitrous oxide emissions has been investigated. The results show that a favourable combustion atmosphere for the suppression of nitrous oxide formation can be created through both an atmosphere of low oxygen concentration in burners obtained by flue gas recirculation and flue gas circumfluence in the center of furnace with flat flame burners. Flue gas recirculation effectively reduces the local temperature of flame and nitrous oxide formation, which is helpful to low nitrous oxide emissions of flat flame with HiTAC.
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