The flame structure and combustion dynamics in micro-mixing combustion of hydrogen-rich syngas with air

IF 9 1区工程技术 Q1 ENERGY & FUELS

Energy Pub Date : 2025-04-22 DOI:10.1016/j.energy.2025.136282

Dengke Chen , Penghua Qiu , Chang Liu , Wentong Wang , Rui Sun , Yijun Zhao , Linyao Zhang , Chang Xing , Li Liu

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Abstract

Micro-mixing (MM) combustion technology demonstrates remarkable NOx reduction capability in gas turbines. As for hydrogen-rich syngas with typical heating value, the experimental studies are carried out at different equivalence ratio (φ) of 0.380, 0.403, 0.426, 0.450, 0.474 and 0.499 and different nozzle outlet mixture velocity (v) of 32, 43, 54,64 and 75 m/s. An in-depth discussions on flame structure, combustion dynamics, and pollutant emissions is conducted. The result shows that in the operation range, no flashback or combustion oscillation occurred in actual experiments of the combined MM nozzles. With the increase of φ or decrease of v, the overall OH signal intensity and the anchoring ability of the flames become stronger, the heat release rate and temperature distribution uniformity would be enhanced, the degree of flame fluctuation decreases. NO emission increases rapidly with the increase of φ, which is consistent with the generation characteristics of thermal type NO, but under test conditions, they are not higher than 15 μL/L at 15 %O₂. The increase of v is beneficial for reducing NO emission, attributed to the shortened residence time of gas.

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富氢合成气与空气微混合燃烧火焰结构及燃烧动力学

微混合燃烧技术在燃气轮机中表现出显著的氮氧化物还原能力。对于具有典型热值的富氢合成气，分别在等效比φ为0.380、0.403、0.426、0.450、0.474、0.499和喷嘴出口混合速度v为32、43、54、64、75 m/s的条件下进行了实验研究。对火焰结构、燃烧动力学和污染物排放进行了深入的讨论。结果表明，在实际试验中，组合式MM喷嘴在工作范围内未出现闪回现象和燃烧振荡现象。随着φ的增大或v的减小，火焰的整体OH信号强度和锚定能力增强，放热速率和温度分布均匀性增强，火焰波动程度减小。随着φ的增大，NO排放量迅速增加，这与热型NO的生成特征一致，但在测试条件下，在15% O2条件下，NO排放量不高于15 μL/L。v的增加有利于减少NO的排放，这是由于气体停留时间的缩短。

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来源期刊

Energy 工程技术-能源与燃料

CiteScore

15.30

自引率

14.40%

发文量

审稿时长

14.2 weeks

期刊介绍： Energy is a multidisciplinary, international journal that publishes research and analysis in the field of energy engineering. Our aim is to become a leading peer-reviewed platform and a trusted source of information for energy-related topics. The journal covers a range of areas including mechanical engineering, thermal sciences, and energy analysis. We are particularly interested in research on energy modelling, prediction, integrated energy systems, planning, and management. Additionally, we welcome papers on energy conservation, efficiency, biomass and bioenergy, renewable energy, electricity supply and demand, energy storage, buildings, and economic and policy issues. These topics should align with our broader multidisciplinary focus.