Extinction Limits and Chemical Kinetics Analysis of Counterflow Diffusion Flames of Dimethyl Ether/Ammonia
Ammonia has recently received much attention as a novel clean energy with broad ap-plication prospects.The paper focuses on the extinction limits of dimethyl ether/ammonia mixtures cool and hot diffusion flames by an atmospheric counterflow burner.The low and high temperature chemical kinetics of dimethyl ether/ammonia are analyzed.The results show that the extinction lim-its of dimethyl ether/ammonia mixtures cool and hot diffusion flames decrease with the increase of the ammonia blend ratios.For dimethyl ether/ammonia cool flames,the low temperature reactivity of dimethyl ether is inhibited mainly through three aspects:ammonia and dimethyl ether vie OH,DME+NO⇔R+HNO and RO2+NO⇔RO+NO2.For dimethyl ether/ammonia diffusion hot flame,the high temperature reactivity of dimethyl ether is improved by the reaction of OH,H and O radicals generated by ammonia with dimethyl ether and the reaction of HCCO+NO ⇔HCNO+CO and HCCO+NO⇔HCN+CO2.Moreover,this research shows that the main oxynitrides in dimethyl ether/ammonia cold flame and hot flame are NO2 and NO respectively.
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