煤焦CO_2气化的热重分析研究　（Ⅰ）等温热重研究

A THERMOGRAVIMATRIC STUDY OF CHAR-CO_2 GASIFICATION PART(Ⅰ)BY ISOTHERMAL TECHNIQUE

运用等温热重技术，对三种不同煤化度的煤焦，在９５０～１４００℃温度区内进行了ＣＯ_２气化研究，考察了这三种煤焦在不同气化温度下的活性变化，并对动力学计算的结果进行了讨论，研究发现，气化温度对煤焦气化速率的影响程度不同，１１００℃以下反应为。动力学控制阶段，１１００℃以上逐步过渡为扩散控制阶段，在高的气化温度下，反应速率增大，表现活化能值降低。

Gasification rates of three coal chars were measured thermogravimatrically in a carbon dioxide atmosphere at temperatures in the range 950～1400℃.These chars were prepared by carbonization of Zhalainuoer lignite(ZL),Shenfu bituminous(SF),Yangquan anthracite(YQ)with different ranks in N2 to 800℃ at 15℃/min with 0.5h soaking time.Kinetic parameters were calculated and discussed in detail.The results showed that the effect of gasification temperature during different period on char-CO_2 gasification reactivity were not same:the reaction was controlled by kinetics below 1100℃ and gradually became diffusion-controlling step when gasification temperature was higher than 1100 ℃.Higher gasification temperature led to higher reactivity and lower apparent activation energy.