摘要
目前对加氢裂化反应过程的整体能量衡算以及反应器大尺度空间放热情况报道较多,但对于反应过程中催化剂体系自身的温度分布情况却讨论极少。本文以真实蜂巢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波动对于催化剂内部温度分布的影响。同时使用能谱面扫描的方法分析积炭的蜂巢型催化剂截面,标示截面的碳元素分布,进而对计算获取的催化剂内部温度分布计算进行实验辅证。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以及催化剂内部的几何形态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。
At present, there are many reports about the overall energy balance and the large scale space heat release in hydrocracking process. Temperature distribution of catalyst bulk in hydrocracking process is rarely involved. Based on three-dimensional environment of real Honeycomb type hydrocracking catalyst, the Meshfree calculation solving Fourier partial differential equation is provided which uses the function of simulating industrial operating temperature as the boundary condition. The influence of external temperature fluctuation on the internal temperature distribution of the catalyst was analyzed using the calculated results. At the same time, the carbon distribution of honeycomb type catalyst cross section was analyzed by the method of energy spectrum scaiming, and the calculation of internal temperature distribution of catalyst was carried out. The analysis results showed that the actual reactions in the catalyst were not isothermal reaction. At the same time, catalyst bulk temperature distribution was restricted to the fluctuation of reaction temperature hydrocracking reaction process outside and catalyst internal hotspot distribution. Catalyst bulk phase average temperature was influenced by heat of reaction, the catalyst particle size, material density, reaction space velocity and catalyst inner hotspot distribution.
出处
《化工进展》
EI
CAS
CSCD
北大核心
2016年第B11期160-167,共8页
Chemical Industry and Engineering Progress
基金
中国石油化工股份有限公司综合课题(JQ-011308)
关键词
加氢
传热
模拟
催化剂
模型
hydrogenation
heat transfer
simulation
catalyst
model
