PODE_(2-4)掺混正庚烷/甲苯燃烧碳烟颗粒理化性质影响研究  

Study on Effect of PODE_(2-4)Blended with n-Heptane/Toluene Combustion on Physicochemical Properties of Soot Particles

作　　者：田波 李青 魏明亮 李志丹[2,3] 王宇 TIAN Bo;LI Qing;WEI Mingliang;LI Zhidan;WANG Yu(School of Automotive Engineering,Wuhan University of Technology,Wuhan 430070,China;State Key Laboratory of Intelligent Agricultural Power Equipment,Luoyang,Henan 471039,China;Luoyang Tractor Research Institute Co.Ltd.,Luoyang,Henan 471039,China)

机构地区：[1]武汉理工大学汽车工程学院,武汉430070 [2]智能农业动力装备全国重点实验室,河南洛阳471039 [3]洛阳拖拉机研究所有限公司,河南洛阳471039

出　　处：《西安交通大学学报》2023年第12期120-128,共9页Journal of Xi'an Jiaotong University

基　　金：拖拉机动力系统国家重点实验室开放课题资助项目(SKT2022009)。

摘　　要：为研究一种聚甲氧基二甲醚(PODE_(2-4))掺混正庚烷/甲苯混合燃料对碳烟颗粒理化性质的影响,搭建了同轴射流反扩散火焰燃烧平台,采用透射电子显微镜(TEM)、拉曼光谱仪(Raman)和热重分析仪(TGA)对颗粒样品进行分析。结果表明:随着PODE_(2-4)由0掺混至30%,碳粒子直径逐渐向小粒径方向偏移,平均粒径逐渐下降,颗粒内部微晶曲率平均值逐渐增大,微晶长度则呈相反趋势,且减小幅度逐渐增大;一阶拉曼光谱中代表晶格内部缺陷和无序结构的D峰与代表石墨稳定结构的G峰的积分强度之比逐渐增加,石墨化程度降低,无序程度增大;质量损失速率峰值温度、起始氧化温度、燃尽温度和表观活化能均呈下降趋势,颗粒反应活性增强。分析结果表明,PODE_(2-4)可作为燃料添加剂改变碳烟颗粒微观结构,进而增强其氧化活性,该研究可为实际工程应用中PODE_(n)与柴油掺混燃烧并促进DPF再生提供一定的理论参考。To study the effect of polyoxymethylene dimethyl ethers(PODE_(2-4))blended with n-heptane/toluene fuel on the physicochemical properties of soot particles,a coaxial jet inverse diffusion flame combustion platform was established.The particle samples were analyzed by transmission electron microscopy(TEM),Raman spectrometer(Raman),and thermogravimetric analyzer(TGA).According to the results,with PODE_(2-4)mixing increasing from 0 to 30%,gradually,the diameter of carbon particles shifts to the direction of smaller particle size,the average particle size decreases,and the mean value of microcrystal tortuosity increases,while the microcrystal length show the opposite trend,and the decreasing rate increases gradually.Additionally,in the first-order Raman spectrum,the ratio of the integral strength of peak D,which represents the internal defects and disordered structure of the lattice,and peak G,which represents the stable structure of graphite,continuously increase,the degree of graphitization decreases,and the degree of disorder increases.Furthermore,the peak temperature of weight loss rate,initial oxidation temperature,burnout temperature and apparent activation energy all decrease while the reactivity of particles increases.The results indicate that PODE_(2-4)can be used as a fuel additive to change the microstructure of soot particles and enhance its oxidation activity,which can provide a theoretical reference for the combustion of PODE_(n)blend diesel fuel and promote the regeneration of DPF in practical engineering applications.

关 键 词：聚甲氧基二甲醚 层流扩散火焰 碳烟颗粒 微观结构 石墨化程度 氧化活性 

分 类 号：TK16[动力工程及工程热物理—热能工程]