摘要
着眼于直接计算圆柱状催化剂效率因子的二维模型,进行了两方面的工作:发展合适的近似解析法并检验该方法的可靠性.在近似解析法中,以多项式关联效率因子和Thiele模数(φ),并结合二维问题的特征,选择(1/tanh∮-1/φ)/φ为多项式元素.通过极端情况下二维反应-扩散方程的求解,提供了使用该方法所需参数的实际数值.在一级可逆反应、变换反应和催化剂表面中毒的甲醇分解反应3种场合下考察本文所提出的近似解析法,所得结果表明:该方法不仅计算过程极其简单,而且结果可靠,其计算精度与有限元法和正交配置法相当.该方法对表面中毒情况的计算同样适应.
Aiming at the direct calculation of two-dimensional model of effectiveness factor for a cylindrical catalyst pellet,this paper presents the construction of approximate analytical method and the corresponding accuracy test.A polynomial form is chosen to correlate the relationship between effectiveness factor and Thiele modulus(φ),where (1/tanhφ-1/φ)/φ is the element considering the features of two-dimensional problem.The needed values of parameters in calculation are provided by solving two-dimensional diffusion-reaction equations under extreme conditions.The accuracy is tested by first-order reversible reaction,steam-shift reaction and methanol decomposition reaction,and the results show that the approximate analytical method is not only simple but also has the same accuracy as the finite-element method or orthogonal collocation method.Further,it can be used in the problem of surface poisoned catalyst pellets.
出处
《化工学报》
EI
CAS
CSCD
北大核心
1998年第6期649-654,共6页
CIESC Journal
关键词
圆柱状
催化剂
效率因子
二维模型
多孔
中毒
approximate analytical method,cylindrical catalyst pellet,effectiveness factor,twodimensional model