Comparative Study on Soot Reduction, Soot Nanostructure and Oxidation Reactivity of n-heptane/DMC and Isooctane/DMC Inve
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https://doi.org/10.1007/s11630-020-1298-y
Article ID: 1003-2169(2020)00-0000-00
Comparative Study on Soot Reduction, Soot Nanostructure and Oxidation Reactivity of n-heptane/DMC and Isooctane/DMC Inverse Diffusion Flames JIANG Bo1,2,3, PALADPOKKRONG Chutikarn1,2, LIU Dong1,2,* 1. MIIT Key Laboratory of Thermal Control of Electronic Equipment, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China 2. Advanced Combustion Laboratory, School of Energy and Power Engineering, Nanjing University of Science and Technology, Nanjing 210094, China 3. Jiangsu Province Key Laboratory of Aerospace Power System, Nanjing 210016, China © Science Press, Institute of Engineering Thermophysics, CAS and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract: Dimethyl carbonate (DMC) is an environmentally oxygenated compound which can be used efficiently for soot reduction. This paper compared the soot reduction, soot nanostructure and oxidation reactivity from inverse diffusion flames (IDFs) of the hydrocarbon fuels, namely n-heptane and isooctane doped with DMC. Effects of DMC additions on soot reduction were discussed. DMC addition is more effective for the soot reduction of n-heptane/DMC IDF than isooctane/DMC IDF. The morphology and nanostructures of soot particles were investigated by Transmission Electron Microscopy (TEM) and High Resolution TEM (HRTEM), and the soot graphitization and oxidation reactivity were analyzed by X-ray Diffraction (XRD) and Thermogravimetric Analyzer (TGA), respectively. The results of HRTEM images showed that many larger aggregates were observed for the structures of soot particles from IDFs with DMC additions. The soot particles exhibited more liquid-like material, more amorphous, higher disorganized layers, and less graphitic than that of IDFs without DMC additions. With increasing of DMC blending rate, soot particles changed younger to have shorter fringe length, higher tortuosity, and greater fringe separation. Based on the XRD and TGA results, the degree of the soot graphitization level decreased; the soot mass lost significantly faster, and the soot become more reactive.
Keywords: inverse diffusion flame, n-heptane/DMC, isooctane/DMC, soot reduction, soot nanostructure, oxidation reactivity
1. Introduction One of major sources of air pollutions is soot emitted from incomplete combustion of hydrocarbon fuels. It has caused problems such as harmful effects to environment, public health, and hardware performance; and the lung cancer and cardiopulmonary disease are mainly because
Received: Feb 07, 2020
AE: TIAN Zhenyu
of soot formation from combustion processes [1, 2]. Therefore, it is very significant to study soot reduction, nanostructure, and reactivity. Oxygenated fuels have a chemical compound containing oxygen. They are used to help fuel burn more efficiently and reduce some types of air pollution. In recent years, oxygenated fuels have been studied for
Corresponding author: LIU Dong
E-mail: [email protected] www.sprin
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