双催化层固定床甲烷化反应器CFD模拟  

CFD simulation of fixed-bed methanation reactor with double catalyst layers

作　　者：赵静[1] 张亚新[1] 冉文燊 程源洪 

机构地区：[1]新疆大学化学化工学院,新疆乌鲁木齐830046

出　　处：《化工学报》2015年第9期3462-3469,共8页CIESC Journal

基　　金：国家自然科学基金项目(21366032)~~

摘　　要：温度分布直接影响着固定床甲烷化反应器的甲烷产量和设备安全性。以年产12.75亿立方煤制天然气绝热甲烷化反应器为研究对象,在建立真实设备三维模型的基础上,利用ANSYS-CFX有限元数值模拟的方法,建立多孔介质内化学反应、热交换与质量传递的气-固两相反应器模型,获得了双段固定床甲烷化反应器内部温度、压力、速度场的分布规律及甲烷产率分布。对不同床层结构对应的特征场分布进行了探索,分析了床层结构对各特征场分布的影响,确定了床层结构优化方案,MCR催化剂床层出口处支撑延长的结构更有利于温度场沿反应器径向的均匀分布和甲烷质量分数的提高。对反应器入口温度、空速、压力对特征参数分布的影响进行了研究,提出了针对本工艺的允许入口参数波动范围。The temperature distribution has its influence directly on methane production and equipment safety of the fixed-bed methanation reactor. To research the adiabatic methanation reactor which can produce 1.275 billion cubic meters SNG a year, the three-dimensional entity model was set up. A gas-solid two-phase reactor model for chemical reactions, heat exchange and mass transfer in porous media was established by the software ANSYS-CFX. The internal profile of temperature, pressure and velocity field and the methane yield profile in the fixed-bed internal methanation reactor with double catalyst layers were obtained. Based on the finite element numerical simulation method, the characteristic field distributions of different bed structures were explored. The influence of the bed structure on each characteristic field profile was analyzed, and then, the structure optimization of the bed layer was determined. The structure of the end support extend model was more favorable of the temperature profile along the radial of the reactor and the improvement of the methane mass fraction. The entrance temperature, space velocity and entrance pressure were researched. Through the analysis of the parameters that influenced the degree of the reaction, the fluctuation ranges of the permitted entrance were put forward for this process.

关 键 词：固定床 甲烷化反应器 数值模拟 有限元 场分布 计算流体力学 

分 类 号：TQ545[化学工程—煤化学工程]