Effects of dimethoxymethane and isopropanol blending on soot formation in ethylene and propane counterflow diffusion flames

IF 5.6 2区 工程技术 Q2 ENERGY & FUELS Journal of The Energy Institute Pub Date : 2024-08-30 DOI:10.1016/j.joei.2024.101805
Lei Xu , Jincheng Yang , Xinkai Shen , Xutong Wu , Dong Liu
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Abstract

Introducing low-carbon oxygenated fuels into the current transport sector provides an effective pathway for mitigating the emissions of greenhouse gases and harmful pollutants such as soot. Previous studies have revealed that oxygenated fuels can reduce soot formation, but the soot-reduction potential is closely related to the chemical interaction between the oxygenates and the baseline hydrocarbons. This work is devoted to study the effects of blending dimethoxymethane (DMM) and isopropanol (IPA) on soot formation in ethylene-based and propane-based counterflow diffusion flames. Soot formation in the target flames was experimentally characterized using a planar light extinction technique, accompanied by numerical analysis to provide complementary insights. The results confirmed that the effects of blending oxygenates on soot formation are sensitive to the fuel-specific molecular structure of the oxygenates and hydrocarbons. For the C2H4-based flames, blending DMM and IPA could lead to a synergistic effect on soot formation due to chemical fuel interaction, with stronger synergy observed with IPA blending. In contrast, no evident synergistic effects on soot formation were observed in the C3H8-based flames, for which a notable soot reduction was observed with DMM blending. Reaction pathway analysis suggested that the occurrence of soot synergy in the C2H4-based flames is mainly due to the chemical interaction between the methyl radicals generated from DMM/IPA and the C2 species from C2H4. This study is expected to deepen our understanding of the soot formation behavior of DMM- and IPA-blended flames, thus contributing to their successful usage as clean alternative fuels.

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二甲氧基甲烷和异丙醇混合对乙烯和丙烷逆流扩散火焰中烟尘形成的影响
将低碳含氧燃料引入当前的交通领域,为减少温室气体和有害污染物(如烟尘)的排放提供了有效途径。以往的研究表明,含氧燃料可以减少烟尘的形成,但其减少烟尘的潜力与含氧化合物和基准碳氢化合物之间的化学作用密切相关。这项工作致力于研究混合二甲氧基甲烷(DMM)和异丙醇(IPA)对乙烯基和丙烷基逆流扩散火焰中烟尘形成的影响。使用平面光消光技术对目标火焰中的烟尘形成进行了实验表征,并通过数值分析提供了补充见解。结果证实,混合含氧化合物对烟尘形成的影响对含氧化合物和碳氢化合物的特定燃料分子结构非常敏感。对于以 C2H4 为基础的火焰,由于燃料的化学作用,混合 DMM 和 IPA 会对烟尘的形成产生协同效应,而混合 IPA 会产生更强的协同效应。相比之下,在基于 C3H8 的火焰中没有观察到对烟尘形成的明显协同效应,而在混合 DMM 的火焰中观察到烟尘明显减少。反应途径分析表明,在以 C2H4 为基础的火焰中出现烟尘协同作用主要是由于 DMM/IPA 产生的甲基自由基与 C2H4 产生的 C2 物种之间的化学作用。这项研究有望加深我们对 DMM 和 IPA 混合火焰烟尘形成行为的理解,从而促进它们作为清洁替代燃料的成功应用。
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来源期刊
Journal of The Energy Institute
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.
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