Numerical analysis of ammonia/coal-volatile combustion under water dilution conditions

IF 5.6 2区工程技术 Q2 ENERGY & FUELS

Journal of The Energy Institute Pub Date : 2025-04-10 DOI:10.1016/j.joei.2025.102093

Yueru Chen , Bin Zhang , Jieyu Jiang , Xiaoyong Zhang , Xianran Zhu , Chunjie Sui

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引用次数: 0

Abstract

Ammonia (NH₃)/coal co-combustion offers an effective approach for reducing carbon emissions from coal-fired boilers while enhancing the combustion characteristics of NH₃. The addition of NH₃ introduces fuel-N, and the use of water vapor dilution combustion technology can help lower NO_X emissions. However, the use of H₂O vapor as a diluent in combustion, particularly within NH₃-coal-volatile co-combustion systems, remains under researched. This study addresses the gap by examining different NH₃ and H₂O ratios. A new NH₃/coal-volatile co-combustion mechanism was developed. The flame propagation characteristics of the laminar flame were analyzed. Additionally, the H/O/OH/CH₃ free radical pool was observed, and chemical reaction kinetics were analyzed to understand the mechanisms behind NO_X (NO and N₂O) reduction. The results indicate that increasing the ratio of H₂O to NH₃ significantly reduces the laminar burning velocity while increasing the flame thickness. Such change also decreases and delays the peak mole fractions of H/O/OH radicals. Under stoichiometric conditions, H₂O promotes the NH₂+NO reaction. H₂O also enhancing the thermal DeNO_X process and effectively inhibiting NO generation.

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水稀释条件下氨/煤挥发性燃烧数值分析

氨（NH3）与煤共燃是降低燃煤锅炉碳排放，同时提高NH3燃烧特性的有效途径。NH3的加入引入了燃料n，使用水蒸气稀释燃烧技术可以帮助降低NOX排放。然而，在燃烧中，特别是在nh3 -煤挥发共燃烧系统中，H2O蒸汽作为稀释剂的使用仍在研究中。本研究通过考察不同的NH3和H2O比例来解决这一差距。提出了一种新的NH3/煤挥发分共燃烧机理。分析了层流火焰的火焰传播特性。此外，还观察了H/O/OH/CH3自由基池，并分析了化学反应动力学，以了解NOX （NO和N2O）还原的机理。结果表明，增加H2O与NH3的比例可以显著降低层流燃烧速度，同时增加火焰厚度。这种变化也降低和延迟了H/O/OH自由基的峰值摩尔分数。在化学计量条件下，H2O促进NH2+NO反应。H2O还能促进热脱氧过程，有效抑制NO的生成。

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.