Sooting tendency and particle size distributions of n-heptane/toluene mixtures burned in a wick-fed diffusion flame
Sooting tendency and particle size distributions of n-heptane/toluene mixtures burned in a wick-fed diffusion flame
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DOI：
10.1016/j.fuel.2015.12.014
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发表时间：
2016-04
期刊：
影响因子：
7.4
通讯作者：
María L. Botero;S. Mosbach;M. Kraft
中科院分区：
文献类型：
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作者：
María L. Botero;S. Mosbach;M. Kraft
研究了正庚烷与甲苯二元混合物和一种商品汽油的排烟特性。实验涉及燃料在导燃式燃烧器中的非预混燃烧。利用差分迁移率谱仪（DMS）测量了不同高度火焰顶端烟尘的粒径分布。利用透射电子显微镜（TEM）研究了所形成颗粒的形貌。研究了纯正庚烷和甲苯，以及正庚烷中甲苯体积分数分别为10%、30%和50%的混合物。甲苯与庚烷的结合使PSD的直径变大。在正庚烷中加入甲苯后，烟灰粒径与火焰高度的关系由类似石蜡变为类似芳香燃料，呈非线性变化。在没有检测到颗粒的最低流速下，发现了对甲苯添加的耐受性。还分析了一种按质量计芳烃含量约为44%的商品汽油。烟点和psd与50%甲苯50%正庚烷混合物相似，但汽油形成的平均聚合迁移度、颗粒数和初级颗粒尺寸较小。
The sooting characteristics of binary mixtures of n-heptane and toluene and a commercial gasoline were studied. The experiment involves the non-premixed combustion of the fuel in wick-fed burner. The particle size distributions (PSDs) of soot were measured at the tip of flames of different heights, using a differential mobility spectrometer (DMS). Transmission electron microscopy (TEM) was used to investigate the morphology of the particles formed. Pure n-heptane and toluene were studied along with blends of 10%, 30%, and 50% by volume of toluene in n-heptane. The addition of toluene to heptane shifts the PSD to larger diameters. As toluene is added to n-heptane the dependence of soot particle size on flame height changes from resembling a paraffinic to resembling an aromatic fuel in a non-linear fashion. A tolerance to toluene addition at the lowest flow rates was found, where particles were not detected. A commercial gasoline with approximately 44% by mass of aromatics was also analysed. The smoke point and PSDs are similar to the mixture 50% toluene 50% n-heptane, but the mean aggregate mobility size, number of particles and primary particle size formed by the gasoline are smaller.