碳烟的微观形貌及分析

Microstructure of Soot and Its Analyzing

摘要: 碳烟是大气细颗粒物的主要成分，主要来源于生物质和化石燃料的燃烧。本文利用透射电镜观察木屑和棉花秸秆在不同条件下燃烧所生成的碳烟的微观形貌，单个碳烟颗粒的形状多为球状。较高的含氧量和温度有利于燃料的有效燃烧，并使碳烟中的有机碳充分挥发，脱氢反应进行的更加完全，最终使碳烟颗粒的粒径减小。而且碳烟颗粒之间通过相互碰撞会发生凝并，使单个颗粒变为链状、网状，排列更加整齐有序。

Abstract: Soot is the main component of atmospheric fine particles, primarily comes from biomass and fossil fuel burning. By the observation of TEM, we analyzed microstructure of cotton straw and saw dust soot and configuration changes, and most of the soot particles are like capsule and sphere. So higher temperature and oxygen level are beneficial to the volatilization of organic carbon and dehy-drogenation reaction, which would make soot diameter smaller; the collision and coagulation of fin-er soot would turn the single particle into chains and nets, so the arrangement would be in order.