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柴油/碳酸二甲酯燃烧颗粒的微观结构和分形特征

李铭迪 赵琛 许广举 王忠 陈庆樟 焦洪宇

李铭迪, 赵琛, 许广举, 王忠, 陈庆樟, 焦洪宇. 柴油/碳酸二甲酯燃烧颗粒的微观结构和分形特征[J]. 环境科学研究, 2016, 29(6): 900-906.
引用本文: 李铭迪, 赵琛, 许广举, 王忠, 陈庆樟, 焦洪宇. 柴油/碳酸二甲酯燃烧颗粒的微观结构和分形特征[J]. 环境科学研究, 2016, 29(6): 900-906.
LI Mingdi, ZHAO Chen, XU Guangju, WANG Zhong, CHEN Qinzhang, JIAO Hongyu. Microstructure and Fractal Characteristic Analysis of Particulate Matter from Diesel/DMC Combustion[J]. Research of Environmental Sciences, 2016, 29(6): 900-906.
Citation: LI Mingdi, ZHAO Chen, XU Guangju, WANG Zhong, CHEN Qinzhang, JIAO Hongyu. Microstructure and Fractal Characteristic Analysis of Particulate Matter from Diesel/DMC Combustion[J]. Research of Environmental Sciences, 2016, 29(6): 900-906.

柴油/碳酸二甲酯燃烧颗粒的微观结构和分形特征

基金项目: 国家自然科学基金项目(51506011,51376083);江苏省高校自然科学基金重点项目(13KJA470001)

Microstructure and Fractal Characteristic Analysis of Particulate Matter from Diesel/DMC Combustion

  • 摘要: 为降低柴油机颗粒物排放,探讨了柴油机燃用柴油/碳酸二甲酯混合燃料燃烧颗粒微观结构和分形特征的变化规律. 采用扫描电镜、透射电镜和SAXS(同步辐射小角X射线散射)相结合的方法,针对DMC(碳酸二甲酯)添加量(以w计)对柴油机燃烧颗粒微观结构和分形特征参数的影响规律进行了研究. 结果表明:与柴油燃烧颗粒相比,D10〔w(DMC)为10%〕、D20〔w(DMC)为10%〕燃烧颗粒的碳粒子平均层面间距分别增加了5.3%、15.1%,弯曲度平均值分别增加了4.0%和10.3%,表明燃烧颗粒的氧化活性增加;与柴油相比,D10、D20燃烧颗粒的质量分形维数分别增加了0.44和0.52,下限均升高了0.2,SAXS与电镜图像对燃烧颗粒的质量分形维数的分析结果相一致,即质量分形维数随DMC添加量的增加而升高,表明燃烧颗粒的团聚程度提高;与柴油燃烧颗粒相比,D10、D20燃烧颗粒表面分形维数的下限分别升高了0.1和0.2,表明其燃烧颗粒表面的粗糙程度和不规则程度提高;与柴油燃烧颗粒相比,D10、D20燃烧颗粒的活化能分别降低了3.9和7.9 kJ/mol,表明燃烧颗粒的氧化活性随着DMC添加量的增加而增强,验证了燃烧颗粒微观尺寸结构和分形特征的研究结果. 研究显示,柴油中添加DMC能够提高燃烧颗粒的氧化活性,燃烧颗粒的氧化活性越强,其在后处理过程中就越易被氧化,有助于降低柴油机的颗粒物排放.

     

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出版历程
  • 收稿日期:  2015-09-21
  • 修回日期:  2016-03-10
  • 刊出日期:  2016-06-25

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