升温速率对煤焦-CO_2高温气化反应性的影响  

Influence of Heating Rates on Char-CO_2 Gasification Reactivity at Elevated Temperature

作　　者：李朋[1] 于庆波[1] 秦勤[1] 杜文亚[1] 

机构地区：[1]东北大学国家环境保护生态工业重点实验室,辽宁沈阳110004

出　　处：《东北大学学报（自然科学版）》2010年第9期1309-1312,共4页Journal of Northeastern University(Natural Science)

基　　金：国家高技术研究发展计划项目(2006AA05Z209);国家自然科学基金-钢铁联合研究基金资助项目(50574021);国家科技支撑计划项目(2006BAE03A11)

摘　　要：利用STA409PC综合热分析仪以程序升温法来研究煤焦-CO2气化反应,主要考察了高温下升温速率对煤焦气化反应性的影响,并用Ozawa法和单一升温速率法对其动力学参数进行了求算.实验结果表明:升温速率对煤焦气化反应有明显影响,升温速率越大,相同时间内,煤焦的碳转化率越高,但是其升温速率存在一上限值,而且这一上限值随煤种的不同而不同;随升温速率的增大,DTG曲线向高温方向移动,峰值温度和最大反应速率也随之增大;利用Ozawa法求得的鞍钢煤焦和本钢煤焦的活化能均在110 kJ/mol左右,阜新煤焦的活化能为87 kJ/mol.The char-CO2 gasification reaction at elevated temperature was investigated kinetically via the temperature-programmed thermogravimetry using STA409PC thermal analyzer,where the influence of heating rates on gasification reactivity was emphasized and the kinetic parameters were calculated by the Freeman and Ozawa methods.The results showed that the heating rate affects the reaction greatly,and that the higher the rate,the higher the conversion rate from char into CO2 within the same period.However,there is on upper bound for the heating rate,which varies in accordance to different coal origins.In addition,the relevant DTG （derivative thermogravimetry） curve moves forwards higher temperature with increasing heating rate,and the peak temperature and maximum reaction rate increase as well.The activation energy of coal char used in ANSTEEL and BENSTEEL is about 110 kJ/mol,while that supplied by Fuxin Coal Mine is just 87 kJ/mol.

关 键 词：煤焦 气化 动力学 程序升温法 CO2 

分 类 号：TQ546[化学工程—煤化学工程]