假瞬态洁求解中温变换B109催化剂效率因子

FALSE TRANSIENT METHOD FOR DETERMININGEFFECTIVENESS FACTORS OF HIGH-TEMPERATURESHIFT REACTION CATALYST B109

建立了描述工业催化剂粒内浓度和温度分布的扩散数学模型.借助假瞬态法,提出了非等温扩散模型的有效解法.本文对16组宏观实验速率,获得了各组分的浓度和温度分布,及中温变换B109催化剂效率因子的数值解.采用该法能在不修改边界条件的情况下,求解催化剂颗粒内存在“死区”的定解问题.计算结果合理,计算速度快.

A mathematical diffusion model discribing the profiles of concentration and temperature in industrial catalyst particles is given. An effective algorithm based on false transient method to solve the non-isothermal diffusion model is developed. In this paper the numerical solution of the temperature profile and the concentration profile of each reaction component and the numerical solution of effectiveness factor of high-temperature shift reaction catalyst B109 are obtained from 16 groups of experimental data of global rates. The radius of 'dead zone' and the effectiveness factor can be directly determined by applying this false transient method and without the need for changing of boundary conditions. The calculated results are reasonable and the calculation is not time consuming.