基于无网格方法的圆柱型催化剂体相温度分布数值模拟

The Numerical Simulation About Temperature Distribution of Cylinder Catalyst by Meshless Method

以真实圆柱型加氢裂化催化剂三维体相环境为计算实体,以模拟工业运行温度的定值函数作为边界条件,采用无网格数值方法求解傅里叶传热方程,并使用计算结果分析加氢裂化催化反应过程中外界温度对于催化剂内部温度分布的影响。结果表明,实际加氢裂化反应过程中,催化剂颗粒内部并非等温,外界的反应温度以及催化剂颗粒内部的热点分布对于催化剂团簇内部的温度场分布有一定的影响。催化剂体相内部的平均温度也随着反应体系放热情况、催化剂粒径、原料油密度、反应空速以及催化剂内部热点分布情况的不同而有所变化。

Based on three-dimensional environment of real cylinder hydrocracking catalyst,the meshless calculation to solve Fourier partial differential equation was provided with industrial operating temperature as the boundary condition.The influence of external temperature on the internal temperature distribution of the catalyst was analyzed with the calculated results.The analysis results showed that during the actual reactions there was not isothermal inside catalyst particle.At the same time,the temperature distribution in bulk catalyst was restricted by the reaction temperature of hydrocracking process outside and internal hotspot distribution of the catalyst particle.The average temperature of bulk catalyst phase was influenced by reaction enthalpy,catalyst particle size,material oil density,reaction space velocity and catalyst inner hotspot distribution.