氧化钙固硫反应动力学中的计算机模拟碱金属离子效应(英文)

Simulation and calculation on the kinetics of CaO desulfurization catalytic effects of alkali salts

研究了用催化剂提高CaO固硫率的可行性及其催化剂对固硫反应动力学的影响。用热天平研究了在CaO中添加不同催化剂后的固硫反应的进程,并用等效粒子模型来模拟和处理实验数据,计算了固硫反应动力学参数。结果表明,CaO固硫反应初期为表面化学反应控制阶段,后期转为产物层扩散控制阶段。碱金属的盐类催化剂均能使固硫反应前期的化学反应控制阶段的反应活化能E_α下降。E_α的大小按催化剂中Li^+、Na^+、K ^+、Cs^+离子半径增大的顺序依次递减;而碱金属盐类催化剂使固硫反应后期的产物层扩散控制阶段的反应活化能E_P不同程度地增加。

The effects of alkali salts on sulfation of CaO were studied using thermogravimetric analyzer. The results showed that the conversion of CaO increase by addition different alkali salts. The grain modei was used to describe the sulfation process. The overall rate of sulfation is controlled initially by surface chemical reaction, and then shift to product layer diffusion control. The additions of alkali salts might improve the initial reaction rate and final conversion of CaO. The activation energy of surface...