碳酸盐对高灰分煤粉燃烧的动力学研究  

Kinetics Research of Carbonate on Combustion Behavior of High Ash Coal

作　　者：马保国[1] 徐立[1] 李相国[1] 

机构地区：[1]武汉理工大学硅酸盐材料工程教育部重点实验室,武汉430070

出　　处：《水泥工程》2007年第5期1-4,共4页Cement Engineering

基　　金：国家"863"计划项目(2002AA335050)

摘　　要：采用非等温热重分析技术对比研究了Na2CO3,BaCO3和CaCO3对高灰分煤粉(灰分>44%)燃烧反应动力学参数的影响。非等温热重分析以20℃/min的升温速率从室温升到1000℃,动力学参数采用Coats-Redfern方程进行计算,结果表明:与空白煤样对比,掺有碳酸盐的煤样着火温度均有不同程度的降低,而煤样的最大燃烧速率增大且燃烧最大速率出现的温度前移;当煤粉样品中分别掺有3%的Na2CO3,BaCO3和CaCO3时,煤粉燃烧的活化能比纯煤粉分别降低了15.63%,12.39%和14.23%,且指前因子与活化能之间存在着线形关系,其关系为ln(A)=0.2783E-12.882。The influence of Na2CO3, BaCO3 and CaCO3 on dynamic parameters of combustion reaction of the high ash coal （HAC） are investigated by non-isothermal thermogravimeter analysis （TGA） . Non-isothermal TGA were 6ondueted from the ambient temperature to 1 000℃ at a heating rate of 20℃ ·min^-1. And the kinetics parameters （activation energy and preexponential factor） were determined using the Coats-Redfern method. It is indicated that compared with combustion characteristics of HAC, the ignition temperature of the samples with alkali metal salt decreased. Alkali metal salt can increase the max combustion rate and decrease the related temperature. When the high ash coal which respectively contained 3% Na2CO3, 3%BaCO3 and 3% CaCO3, the activation energies of the corresponding samples decreased at 15.63%, 12.39% and 14.23%. Moreover, there is a linear connection between the activation energies and pre-exponential factors, and the equation is In （A） =0.2783E-12.882.

关 键 词：高灰分煤 燃烧 热重分析 动力学 

分 类 号：TQ172[化学工程—水泥工业]