显微组分焦样的CO_2气化动力学和表面变化  

REACTION KINETICS AND SURFACE VARIATION OF MACERAL CHARS IN CO_2 GASIFICATION

作　　者：张永发[1] 谢克昌[1] 凌大琦[1] 

机构地区：[1]太原工业大学

出　　处：《燃料化学学报》1991年第4期359-365,共7页Journal of Fuel Chemistry and Technology

基　　金：国家自然科学基金

摘　　要：用非等温热重法考察了平朔气煤的稳定组、镜质组和丝质组三种显微岩相组分焦样与CO_2的气化反应性。用CO_2吸附法测定了这些焦样在不同转化率下的比表面积,并用SEM观察了它们在特定转化率下的形貌特征。结果表明,在气化过程中这些焦样的比表面积的变化规律不同,镜质组焦样的变化适合Bhatia方程,丝质组和稳定组焦样的变化适合该方程的修正式;与这种变化关联的具有不同参数值的统一的CO_2气化动力学数学模型为dX/dt=A_oexp(-E/(RT))(1-x)~n[1-ψln(1-X)Reactivities of the chars in CO_2-gasification which are with the major maceral groups from a Pingshuo gas coal have been studied by a non-isothermal thermogravimetry. The specific surface of these chars at varied conversion was measured using the CO_2 gravimetric adsorption method.A model JSM-35 SEM was used to observe the morphology of the chars prepared at varied conversion. The results indicated that the Bhatia equation is suited for describing specific surface variation of vitrinite char, but the modified Bhatia equation is well fit for fusinite and liptinite char,a uniform expression. dX/dt=A_o exp(-E/RT)(1-X)~n [1-ψln(1-X)]~m, can describe the kinetics of the chars-CO_2 gasification with different parameter values.

关 键 词：二氧化碳 气化动力学 比表面 岩相 

分 类 号：O613.71[理学—无机化学]