Temperature dependence of the fuel mixing effect on soot precursor formation in ethylene-based diffusion flames
Temperature dependence of the fuel mixing effect on soot precursor formation in ethylene-based diffusion flames
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DOI：
10.1016/j.fuel.2020.117121
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发表时间：
2020-05
期刊：
影响因子：
7.4
通讯作者：
Wang Yu
中科院分区：
文献类型：
--
作者：
Wang Wei;Xu Lei;Yan Jiin;Wang Yu
碳烟的形成是一个复杂的过程，可能受到多种因素的影响，包括基础燃料类型、燃料混合、温度和压力。在现实条件下，这些因素可以相互作用，共同影响烟灰的形成。目前的工作旨在提供对燃料混合效应对分子烟灰前体形成的温度依赖性的理解。特别是，通过气相色谱测量并利用详细的化学反应机理进行计算，通过实验研究了丙烷和甲烷的添加对乙烯逆流扩散火焰中芳烃形成的影响。覆盖高温（峰值火焰温度~2020 K）和低温（~1660 K）条件下的两个系列火焰，以研究燃料混合效果及其与火焰温度的相互作用。实验结果清楚地证明了丙烷混合对苯形成的影响具有温度依赖性：与乙烯基线火焰相比，在高温火焰中添加丙烷观察到苯的形成显着增强；而在低温条件下苯浓度降低。对于甲烷混合情况，甲烷的添加减少了高温和低温火焰中苯的形成，并且在低温条件下效果更加明显。还使用先前开发的反应机制对测试火焰进行了数值模拟（Wang et al, Combust. Flame, 160 (2013) 1667–1676）。通过基于数值数据的详细反应途径分析，发现C3H8和CH4的添加会抑制C4+C2但增强C3+C3苯的形成途径。然而，这两种途径对总苯生产率的相对重要性很大程度上取决于火焰温度。这一事实被认为是导致 C3H8/CH4 混合效应依赖于温度的主要机制。 C3H8和CH4添加对高温火焰中苯形成的不同性质的影响被认为源于它们对CH3和C3H3自由基浓度的不同影响。目前的工作强调了这样一个事实：燃料混合对苯形成的影响可能高度依赖于火焰热条件。因此，在概括燃料掺杂对芳香和烟灰倾向的影响的文献数据时需要非常小心。
Soot formation is a complex process and can be affected by a variety of factors including base fuel type, fuel mixing, temperature and pressure. Under real-world conditions, these factors can interact with each other to influence soot formation jointly. The present work aims to provide an understanding on the temperature dependence of the fuel mixing effect on the formation of molecular soot precursors. In particular, the effects of propane and methane addition on aromatic formation in ethylene counterflow diffusion flames were studied experimentally by gas chromatography measurements and computationally utilizing a detailed chemical reaction mechanism. Two series of flames under high (with peak flame temperature ~2020 K) and low temperature conditions (~1660 K) were covered to investigate the fuel mixing effects and its interaction with flame temperature. The experimental results clearly demonstrated the temperature-dependence of propane’s mixing effects on benzene formation: Compared to the ethylene baseline flame a notable enhancement of benzene formation was observed with propane addition in the high temperature flames; while a reduction of benzene concentration was seen under low temperature conditions. For the methane mixing cases, the addition of methane decreased benzene formation in both the high and low temperature flames, with the effect being more pronounced under low temperature conditions. Numerical simulations of the tested flames were also conducted with a previously developed reaction mechanism (Wang et al, Combust. Flame, 160 (2013) 1667–1676). Through a detailed reaction pathway analysis based on the numerical data, it was found the addition of C3H8and CH4would inhibit the C4+ C2but enhance the C3+ C3benzene formation pathway. However, the relative importance of the two pathways to total benzene production rate was strongly dependent on flame temperature. This fact was identified to be the primary mechanism leading to the temperature dependence of the C3H8/CH4mixing effect. The qualitatively different effect of C3H8and CH4addition on benzene formation in the high temperature flame was believed to originate from their different influences on CH3and C3H3radical concentrations. The present work highlighted the fact that the effects of fuel mixing on benzene formation can be highly dependent on flame thermal conditions. As a result, great care is needed when generalizing literature data of fuel doping effect on aromatic and sooting tendencies.
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影响因子：
1.6
作者：
Jong-Woong Choi;Byung Chul Choi;S. M. Lee;Suk Ho Chung;K. Jung;W. Jeong;Sang-Kyu Choi;Sung-Cheol Park
通讯作者：
Jong-Woong Choi;Byung Chul Choi;S. M. Lee;Suk Ho Chung;K. Jung;W. Jeong;Sang-Kyu Choi;Sung-Cheol Park
影响因子：
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作者：
Qiyao Feng;Aydin Jalali;A. Fincham;Y. Wang;T. Tsotsis;F. Egolfopoulos
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乙烯中甲烷加成对层流协流扩散火焰中烟灰形态和尺寸分布的影响
影响因子：
9
作者：
Chu, Huaqiang;Han, Weiwei;Xu, Guangju
通讯作者：
Xu, Guangju
DOI：
--
发表时间：
2010-12
期刊：
Theory of Computing Systems \/ Mathematical Systems Theory
影响因子：
--
作者：
P. Zabeti
通讯作者：
P. Zabeti
影响因子：
5.3
作者：
M. Frenklach;T. Yuan;M. Ramachandra
通讯作者：
M. Frenklach;T. Yuan;M. Ramachandra