煤-焦炉气共热解半焦燃烧动力学特性研究──燃烧模型的建立及其表观活化能动态描述  

COMBUSTION KINETICS OF CHAR FROM PYROLYSIS OF COAL WITH COKE-OVEN GAS(COG) DISTRIBUTION TO COMBUSTION APPARENT ACTIVATION ENERGY OF CHAR

作　　者：廖洪强[1] 李保庆[1] 孙成功[1] 

机构地区：[1]中国科学院山西煤炭化学研究所煤转化国家重点实验室

出　　处：《燃料化学学报》1999年第3期246-250,共5页Journal of Fuel Chemistry and Technology

摘　　要：采用热重分析方法（ＴＧＡ）对煤－焦炉气共热解半焦燃烧动力学特性进行研究，建立了半焦燃烧动力学模型，采用新的数学处理方法，实现了表观活化能在半焦燃烧过程中的动态描述及平均表观活化能的求取。分析结果表明，表观活化能在半焦燃烧过程中呈“两头高、中间低”的“钟”型动态分布，其变化范围为：４７～９５ｋＪ／ｍｏｌ，其中主要燃烧失重阶段（转化率为２０％～８０％）的表观活化能较低且变化幅度较小，约为４７～６０ｋＪ／ｍｏｌ，在燃烧转化率为４０％左右出现最低活化能约４７ｋＪ／ｍｏｌ。同一半焦燃烧过程中，表观活化能与燃烧速率动态分布具有良好的对应关系，即较大燃烧速率对应着较低表观活化能。Combustion kinetics of chars from pyrolysis of Xianfeng lignite with COG was studied in detail The combustion kinetics model of char was set by the following equation -d XTBZ/d t=6K(1-X)0.66P 0.5O2/0 d 0 A new method was suggested to describe the distribution of apparent activation energy during the combustion of charIt was found that the apparent activation energy shows the similar but reverse shape with combustion rate plot during the combustion of char and spreads over 47-95kJ/mol The lowest appanent activation energy was found in the combustion conversion (f) about 40(w%,daf) In the combustion of the same char, there is a definite correlation between combustion rate and apparent activation energy, i.e., high burning rate is related to low apparent activation energy Thus, apparent activation energy can be used to describe the combustion reactivities of char

关 键 词：煤 焦炉气 半焦 燃烧动力学 热解 

分 类 号：TQ530.2[化学工程—煤化学工程]