基于无网格方法的齿球型催化剂体相温度分布数值模拟

The numerical simulation about temperature distribution of teethspherical catalyst by meshless method

本文以真实齿球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波动函数作为边界条件,采用无网恪数值方法求解傅立叶传热方程,并使用计算结果分析加氢裂化催化反应过程中外界温度波动对于催化剂内部温度分布的影响。计算结果表明:实际反应过程中催化剂内部并非等温反应,在加氢裂化反应过程中外界的反应温度波动以及催化剂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作用。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 teeth-spherical hydrocracking catalyst, the method of meshfree calculation solving Fourier partial differential equation is provided which uses the function of simulating industrial operating temperature as the boundary condition of Fourier partial differential equation. The influence of external temperature fluctuation on the internal temperature distribution of the catalyst was analyzed using the calculated results. The analysis results show that the actual reactions in the catalyst is not isothermal reaction. At the same time, catalyst bulk temperature distribution is restricted to the fluctuation of reaction temperature hydrocracking reaction process outside and catalyst internal hotspot distribution. Catalyst bulk phase average temperature was influ- enced by heat of reaction, the catalyst particle size, material density, reaction space velocity and catalyst inner hotspot distribution.