摘要
采用热重分析方法对3种石煤的燃烧特性和燃烧动力学进行研究,并对石煤的类属进行了探讨。结果表明:石煤具有高灰、高硫和低热值的特点。石煤的燃烧特性与无烟煤相近,但比无烟煤差。采用Popescu法对石煤的燃烧机理进行分析,表明其燃烧过程主要受扩散控制,三维扩散模型控制的反Jander方程是最佳机理函数。采用等转化率法对石煤不同燃烧阶段的活化能进行考察,表明其在着火、燃烧和燃尽各阶段都需要很高的活化能,进一步证明了石煤的燃烧过程是受扩散控制的。以干燥无灰基挥发分Vdaf作为分类标准来确定石煤的类属是不恰当的;根据煤阶和燃烧特性及动力学分析判断,石煤属于高变质的劣质无烟煤。
Thermogravimetry is applied to analyze the combustion characteristics and combustion kinetic mechanisms of three kinds of stone coal, and the classify attribute of stone coal is investigated. The results show that stone coal is with high ash, high sulfur and low heat value. The combustion characteristics of stone coal are similar to anthracite coal and worse than anthracite. The combustion kinetic mechanism of stone coal is investigated with Popescu method, and the conclusion indicates that the combustion of stone coal is controlled by the three-dimensional diffusion model and the anti Jander equation is the most probable kinetic function. The activation energies of the above three reaction stages are calculated by isoconversional method, and the values show that the energy barriers are always higher which confirms the combustion kinetic mechanism of stone coal. The classification system based on the volatile matter content in dry and ash free basis is not suitable to stone coal. From the coal rank and the combustion characteristics and kinetic analyzing results, the stone coal should be classed as a high rank and maggy anthracite coal.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2007年第29期17-22,共6页
Proceedings of the CSEE
关键词
石煤
燃烧特性
燃烧动力学
类属
热重法
stone coal
combustion characteristics
combustion kinetics
classify attribute
thermogravimetry
