Effect of methane addition to ethylene on the morphology and size distribution of soot in a laminar co-flow diffusion flame
Effect of methane addition to ethylene on the morphology and size distribution of soot in a laminar co-flow diffusion flame
复制标题
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
DOI：
10.1016/j.energy.2018.10.093
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发表时间：
2019-01-01
期刊：
影响因子：
9
通讯作者：
Xu, Guangju
中科院分区：
文献类型：
--
作者：
Chu, Huaqiang;Han, Weiwei;Xu, Guangju
采用热泳取样和透射电镜图像分析的方法，研究了不同氧浓度下甲烷和乙烯扩散火焰中烟灰的特征，以及甲烷与乙烯混合对烟灰生成的影响。分析了烟尘颗粒沿火焰轴的成核、表面生长、混凝、团聚和氧化过程。得到了不同氧浓度和甲烷掺杂比下沿火焰中心线不同高度烟灰粒径分布和聚集特性的变化规律。结果表明：在不同氧浓度下，甲烷火焰中各阶段烟尘的生成明显滞后于乙烯火焰，氧浓度的增加使火焰中各阶段烟尘的生成提前。10%的甲烷掺杂可以促进低火焰位置的烟尘生成。将掺杂量增加到30%，可促进高火焰部位烟尘的生成。在上述两种情况下，燃料燃烧中烟灰形成的协同效应就会发生。然而，在高掺合比条件下，燃料的协同效应将消失。在高共混比下，甲烷-乙烯的作用更像是一种中和作用。(C) 2018 Elsevier Ltd.版权所有。
The characteristics of soot in the diffusion flames of methane and ethylene under different oxygen concentrations and the influence of mixing methane in ethylene on soot generation were investigated using thermophoretic sampling and subsequent transmission electron microscopy image analysis. The process of soot particle nucleation, surface growth, coagulation, agglomeration and oxidation along the flame axis was analyzed. The variation of soot particle size distribution and aggregate characteristics at different heights along the centerline of the flame at different oxygen concentrations and methane doping ratios were obtained. Results show that the various stages of soot generation in methane flame obviously lags behind the ethylene flame at different oxygen concentrations, and increasing the oxygen concentration makes the various stages of soot formation in the flame advance. A 10% methane doping can promote soot generation at low flame locations. Increasing the doping amount to 30%, the generation of soot can be promoted at high flame locations. The synergistic effect of soot formation in fuel combustion occurs in the above two cases. However, the synergistic effect of the fuel will disappear under high blending ratio conditions. The effect of methane-ethylene at high blend ratios is more like a neutralization effect. (C) 2018 Elsevier Ltd. All rights reserved.