用无形孔模型研究影响煤粉燃烧的因素  

THE USE OF SPM IN STUDY OF FACTORS AFFECTING COAL COMBUSTION

作　　者：张小可[1] 陈鸿[1] 孙学信[1] 郑楚光[1] 

机构地区：[1]华中理工大学煤燃烧国家重点实验室

出　　处：《煤炭转化》1996年第3期69-75,共7页Coal Conversion

摘　　要：用一种新的孔隙结构模型──无形孔模型来研究影响煤粉燃烧的因素。对该模型进行数值计算，跟踪燃尽过程中温度、氧浓度、燃烧速率等随时间的变化，得到有关曲线。定量探讨整个煤粒内部的燃烧过程。研究挥发分析出和燃烧对煤粉燃烧过程的影响。研究孔隙率、比表面积、粒径等因素对煤粉着火、燃尽的影响。结果表明孔隙率对燃尽的影响较大，而比表面对着火的影响较大。A shapeless pore model is used to study the factors that affect the coal combustion. Numerical calculation for a single particle based on the model are carried out. It has been found that temperature ,oxygen concentration,combustion rate, burn out porosity varied during combustion,several profiles are obtained. The effects of volatile evolution and combustion on coal combustion are studied. The primary period of volatile evolution is an obstacle to ignition of coal. The velocity of volatile evolution slows down gradually and becomes less than the combustion rate of coal. Residual volatile combusts with char heterogeneously. The effects of physical characters of coal particles such as porosity, pore area, particle size are discussed also. The increase of porosity is of benefit to burn out, but has little effect on ignition. On the contrary,large surface area is good to ignition but has little effect on burn out. Smaller the coal particle size is, easier it is to ignite or combust.

关 键 词：孔模型 孔隙率 孔面积 煤粉 燃烧 

分 类 号：TQ534[化学工程—煤化学工程]