Extinction Limits and Chemical Kinetics Analysis of Counterflow Diffusion Flames of Dimethyl Ether/Ammonia

SONG Yu, ZHANG Zunhua, ZHOU Mengni, XU Shuang, LI Gesheng

Journal of Engineering Thermophysics ›› 2024, Vol. 45 ›› Issue (9) : 2867-2875.

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PDF(4365 KB)
Journal of Engineering Thermophysics ›› 2024, Vol. 45 ›› Issue (9) : 2867-2875.

Extinction Limits and Chemical Kinetics Analysis of Counterflow Diffusion Flames of Dimethyl Ether/Ammonia

  • SONG Yu, ZHANG Zunhua, ZHOU Mengni, XU Shuang, LI Gesheng
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Abstract

Ammonia has recently received much attention as a novel clean energy with broad application 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 limits 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.

Key words

ammonia / dimethyl ether / counterflow diffusion flame / chemical kinetics

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SONG Yu, ZHANG Zunhua, ZHOU Mengni, XU Shuang, LI Gesheng. Extinction Limits and Chemical Kinetics Analysis of Counterflow Diffusion Flames of Dimethyl Ether/Ammonia[J]. Journal of Engineering Thermophysics, 2024, 45(9): 2867-2875
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