摘要
从两方面论述了碳黑的生成机理 :气体火焰中碳黑的生成模型和煤燃烧过程中碳黑的生成模型 ,从而对碳黑的生成机理作了一个详细的综述。在气体火焰的碳黑生成模型中 ,运用化学动力学来诠释在层流预混火焰中大分子芳香族烃的形成。芳香族烃形成的主要步骤是乙炔和小分子芳香族烃的组合 ,主要是因为H原子萃取和共振稳定基团的组合 ,包括聚戊二烯的组合、丙炔对苯的粘附和丙炔对芳香环的连续粘附 ,由此建立了HACA模型 (H萃取乙炔加入模型 )。在此基础上 ,加以对共振稳定基团的分析研究 ,进一步建立气H原子萃取乙炔加入和共振稳定基团组合模型。对于煤燃烧过程中碳黑的生成模型 ,其过程非常复杂 ,国内外论述的比较简单 ,一般认为煤颗粒经过快速加热、热解过程生成焦炭和挥发分 。
In this paper, we illustrate two mechanisms of soot formation including the one in premixed ethylene flames and the other on in coal combustion in order to make a detailed review on soot formation. In the former one, the formation of high molecular weight aromatic species in premixed flames are explored by a detailed chemical kinetic mechanism. Key sequences of reactions in the formation of aromatics are the addition of acetylene to smaller aromatics, activated by H\|atom abstraction and the combination of resonantly stabilized radicals, including cyclopentadienyl radical combination, propargyl addition to benzyl radicals and the sequential addition of propargyl radicals to aromatic rings. So the HACA (H\|abstraction acetylene addition) model is built. And further research on resonantly stabilized radicals leads to the full modeling of the combination of HACA model and resonantly stabilized radicals. As to coal combustion, the processes are so complex that rare theses about it are found. It is commonly known that char and volatiles are produced after coal combustion and pyrolysis. Volatiles can form primary soot, then soot agglomerates are generated after primary soot agglomeration.
出处
《能源工程》
2003年第3期31-34,共4页
Energy Engineering
基金
国家自然科学基金资助项目 ( 5 0 1760 45 )
