Sooting tendency of paraffin components of diesel and gasoline in diffusion flames
Sooting tendency of paraffin components of diesel and gasoline in diffusion flames
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DOI：
10.1016/j.fuel.2014.02.005
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发表时间：
2014-06
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：
--
作者：
María L. Botero;S. Mosbach;M. Kraft
实验研究了汽油和柴油中几种烷烃的化学结构对其结灰特性的影响。该实验涉及煤油芯燃烧器中石蜡的燃烧。利用差示迁移率光谱仪测量了不同火焰高度下的颗粒尺寸分布。在顶端对芯子送入的层流扩散火焰进行采样，从小高度到大高度系统地修改火焰高度。正构烷烃、异构烷烃和环烷烃PSD的演化方式与火焰高度相似。在非常低的火焰高度，PSD是单峰的，但迅速演变为多模的。粒子总数在较小的高度达到峰值，然后随着火焰高度的增加而减少，直到接近所有考虑的燃料的恒定值。碳烟颗粒的平均直径随着火焰高度的增加而增大，直到达到并保持最大值为止。在每种燃料中，随着分子中碳原子数的增加，最大平均碳烟颗粒直径呈系统性地减小。在所有火焰高度下，比较相同碳数的燃料，环烷烃的平均烟尘颗粒尺寸最大，其次是异构烷烃，正构烷烃的烟尘颗粒最小。
The influence of the chemical structure on the sooting characteristics of some paraffin class hydrocarbons which are found in gasoline and diesel fuel is studied experimentally. The experiment involves the combustion of the paraffin in a wick-fed burner. Differential mobility spectrometry is used to measure the particle size distribution (PSD) at different flame heights. The wick-fed laminar diffusion flame is sampled at the tip; the flame height is modified systematically from small heights to large heights. Normal, iso and cyclo paraffins PSDs evolve in a similar way with flame height. At very low flame heights the PSD is unimodal, but rapidly evolves into a multi-modal one. The total number of particles peaks at small heights, and then decreases as flame height increase until it approaches constant values for all considered fuels. The mean soot particle diameter increases with flame height until a height where a maximum is achieved and sustained. Among each type of fuel, a systematic decrease in the maximum mean soot particle diameter was observed as the number of carbon atoms in the molecule increased. At all flame heights, comparing fuels with the same carbon number, cyclic paraffins presented the largest mean soot particles sizes, followed by iso-paraffins and the smallest particles for normal paraffins.