基于计算流体力学的气相烯烃聚合反应器模拟综述

气相聚合过程以流化床为核心反应器,其混合、传递和化学反应过程规律对工艺研发具有指导意义。计算流体力学是一种模拟流体流动的方法,可节省大量人力和物力并提供更全面的反应过程信息,在气固流态化领域得到广泛应用。基于计算流体力学的流态化模拟的难点在于如何建立能够恰当描述颗粒团聚过程的曳力模型,关于热量传递甚至聚合反应过程的模拟工作都是基于此发生的。随着计算机运算能力的提高,研究工业尺度的流化床反应器以及由粒径分布而带来的传递过程的影响可能成为模型广度及深度发展的方向。

Investigation of computational fluid dynamics on the gas phase polymerization reactor

The fluidized bed is a core reactor of the gas phase polymerization process.The law of the mixing,transport and chemical reaction process of the fluidized bed is very necessary for the technology research and development.Computational fluid dynamics (CFD) is a method to simulate the flow characteristic,which can save a lot of manpower and material resources,and obtain more detailed information of the reaction process.CFD,therefore,is widely applied in the field of gas solid fluidization.It is very difficult to develop a CFD model to describe the agglomerate of particles, however,the simulation on the processes of heat transfer and polymerization reaction are all carried out on the basis of this fact.With the improvement of computer calculating capacity,the simulation considering distribution of particle diameter and multiscale effect in the industrial reactors might become the development direction of CFD modeling on the gas phase polymerization.