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Physicochemical properties of soot generated from toluene diffusion flames: Effects of fuel flow rate

机译：甲苯扩散火焰产生的烟灰的理化特性：燃料流量的影响

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Aromatic hydrocarbons are commonly found in fossil-derived transportation fuels, and their combustion in engines produce most of the observed soot particles. Toluene is an important component of gasoline (about 6 wt%), diesel (1-2 wf%), and jet fuels (1-2 wt%), and forms a part of their surrogates. This paper reports the nanostructures and chemical constituents of soot, formed in toluene diffusion flames at different fuel flow rates. High resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) are employed to study the physical properties of soot, while Fourier transform infrared spectroscopy (FTIR), electron energy loss spectroscopy (EELS), and elemental analysis are used to investigate its chemical properties. With increasing fuel flow rate, HRTEM and XRD analyses showed that the lateral size of aromatic layers in soot reduced, while the FTIR analysis revealed that the concentration of aliphatic and oxygenated groups decreased, and that of aromatic group increased. The elemental analysis showed that soot from lower fuel flow rates had more hydrogen and oxygen content than those from higher flow rates. The experimental observations indicate that both physical and chemical characteristics of soot derived from toluene flame are dependent on the fuel flow rate used for its production. (C) 2017 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
机译：芳香烃通常存在于化石衍生的运输燃料中，它们在发动机中的燃烧会产生大部分观察到的烟尘颗粒。甲苯是汽油（约6 wt％），柴油（1-2 wf％）和喷气燃料（1-2 wt％）的重要成分，并构成其替代物的一部分。本文报道了在不同燃料流量下在甲苯扩散火焰中形成的烟灰的纳米结构和化学成分。高分辨率透射电子显微镜（HRTEM）和X射线衍射（XRD）用于研究烟灰的物理性质，而傅立叶变换红外光谱（FTIR），电子能量损失光谱（EELS）和元素分析用于研究烟灰。其化学性质。随着燃料流量的增加，HRTEM和XRD分析表明，烟灰中芳烃层的横向尺寸减小，而FTIR分析表明，脂肪族基团和含氧基团的浓度降低，而芳族基团的浓度升高。元素分析表明，来自较低燃料流量的烟灰比来自较高流量的烟尘具有更多的氢和氧含量。实验观察表明，源自甲苯火焰的烟灰的物理和化学特性均取决于其生产所使用的燃料流速。 （C）2017燃烧研究所。由Elsevier Inc.出版。保留所有权利。

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