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- Title
Study on Mechanisms of NO x Formation and Inhibition during the Combustion of NH 3 /CH 4 and NH 3 /CO Mixtures.
- Authors
Du, Yongbo; Zong, Siyu; Wang, Chang'an; Wang, Yongguan; Lyu, Qiang; Da, Yaodong; Che, Defu
- Abstract
Ammonia is an ideal renewable, carbon-free fuel and hydrogen carrier, which produces nitrogen and water after complete combustion in the presence of oxygen. However, ammonia has low reactivity, slow flame-propagation speed, and carries risks of high nitrogen oxide (NOx) emissions. Co-firing ammonia with an industrial by-product gas (with CH4 and CO being the main combustible materials) is a cost-effective and convenient method of improving the combustion characteristics of ammonia, but attention still needs to be paid to the NOx generation. Currently, the research on NOx formation during co-firing of ammonia with other fuel gases is still insufficient. In this study, a high-temperature furnace reaction system was used to investigate the NOx formation and inhibition mechanisms during the combustion of NH3/CH4 and NH3/CO mixtures. By varying the ammonia blending ratio, excess air coefficient (α), temperature, residence time, and fuel concentration, the key factors influencing NOx generation and inhibition were further analyzed. The results showed that when α was no less than 1, the production of NOx initially increased and then decreased with an increasing proportion of ammonia in the fuel gas. Within the temperature range of 900 °C to 1500 °C, the amount of NOx generated during the combustion of the mixed gas gradually decreased with the increase in temperature. Under the conditions of NH3/CH4 and NH3/CO, the emissions of NOx were higher than those during pure ammonia combustion.
- Subjects
COMBUSTION; GAS mixtures; GAS as fuel; FLAMMABLE materials; NITROGEN in water; COMBUSTION gases
- Publication
Applied Sciences (2076-3417), 2023, Vol 13, Issue 21, p11847
- ISSN
2076-3417
- Publication type
Article
- DOI
10.3390/app132111847