The influence mechanism of mineral Fe on the transformation of nitrogen-containing components during the combustion of ammonia-blended pulverized coal: Experiment coupled with reaction kinetics mechanism

IF 6.2 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-09-13 DOI:10.1016/j.joei.2025.102298

Ping Chen , Haiyi Wang , Huichun Wang , Mingyan Gu , Kun Luo , Xun Hu

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Abstract

The study of the nitrogen conversion mechanism in the co-combustion of ammonia and coal is crucial for achieving low-nitrogen combustion. The inherent mineral Fe significantly affects the formation of nitrogen oxides during combustion, but its mechanism of NO formation during the co-combustion of ammonia and coal is still unclear. Based on this, this paper takes Shenhua bituminous coal as the research object, and explores the NO formation characteristics of raw coal, demineralized coal and Fe-impregnated coal coupled with ammonia combustion. The results show that mineral Fe has an inhibitory effect on the NO formation and the conversion of fuel-N to NO during the co-combustion of ammonia and coal. Compared with pure pulverized coal combustion, the inhibitory effect of Fe on NO formation during ammonia-blended combustion is weakened, but its inhibitory effect is enhanced at high temperature. To further reveal the mechanism of Fe on the N conversion, the mechanism calculation is carried out using the chemkin reaction kinetics. The simulation results shows that Fe significantly inhibits NO formation by reducing the sensitivity and reaction rate of key reactions, and changing the oxidation/reduction path of the N-containing component. Especially at high temperature, Fe exhibits a stronger NO inhibitory effect, further verifying the lower NO emission during the co-combustion of ammonia and Fe-impregnated coal in the experiment.

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矿物铁对氨混煤粉燃烧过程中含氮组分转化的影响机理：实验与反应动力学机理相结合

研究氨煤共燃过程中氮的转化机理是实现低氮燃烧的关键。固有矿物Fe对燃烧过程中氮氧化物的生成有显著影响，但其在氨煤共燃烧过程中生成NO的机理尚不清楚。基于此，本文以神华烟煤为研究对象，探讨了原煤、脱矿煤和浸铁煤在氨燃烧耦合作用下NO的形成特征。结果表明，矿物铁对氨煤共燃过程中NO的生成及燃料n向NO的转化有抑制作用。与纯煤粉燃烧相比，铁对混氨燃烧中NO生成的抑制作用减弱，但在高温下抑制作用增强。为了进一步揭示铁对N转化的作用机理，利用化学金反应动力学进行了机理计算。模拟结果表明，Fe通过降低关键反应的敏感性和反应速率，改变含n组分的氧化/还原路径，显著抑制NO的形成。特别是在高温下，Fe表现出更强的NO抑制作用，进一步验证了实验中氨与Fe浸渍煤共燃烧过程中NO排放量的降低。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of The Energy Institute 工程技术-能源与燃料

CiteScore

10.60

自引率

5.30%

发文量

166

审稿时长

16 days

期刊介绍： The Journal of the Energy Institute provides peer reviewed coverage of original high quality research on energy, engineering and technology.The coverage is broad and the main areas of interest include: Combustion engineering and associated technologies; process heating; power generation; engines and propulsion; emissions and environmental pollution control; clean coal technologies; carbon abatement technologies Emissions and environmental pollution control; safety and hazards; Clean coal technologies; carbon abatement technologies, including carbon capture and storage, CCS; Petroleum engineering and fuel quality, including storage and transport Alternative energy sources; biomass utilisation and biomass conversion technologies; energy from waste, incineration and recycling Energy conversion, energy recovery and energy efficiency; space heating, fuel cells, heat pumps and cooling systems Energy storage The journal''s coverage reflects changes in energy technology that result from the transition to more efficient energy production and end use together with reduced carbon emission.