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
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
1999年第3期246-250,共5页
Journal of Fuel Chemistry and Technology
