催化裂化中可压缩湍流气固两相数值模拟

为了解决石油催化裂化中催化剂颗粒气体动力学难以进行实验的问题,采用基于大涡数值模拟(LES)的研究方法,在一定程度上克服了DNS法的超大计算量和RANS法的通用性小的缺点,对流场湍流有较高的仿真精度。利用工程常见的直管作为仿真对象,采用PFC-CCFD软件,对催化剂颗粒的运动和力学特征,气场的运动进行研究。分析仿真结果,得到管道内催化剂颗粒的速度分布、气场对颗粒的曳力、气场的运动状态、颗粒与颗粒的碰撞次数、颗粒和管壁的碰撞次数、颗粒动能的变化。通过PIV观测试验,研究颗粒运动轨迹,结合理论研究,揭示了管道内催化剂颗粒动力学特征。

Numerical Simulation of Gas-solid Two Phase Compressible Turbulent in Catalytic Cracking

In order to bypass the difficulties in test of catalyst particles fluid dynamic characteristics in oil catalytic cracking process, method based on large eddy simulation (LES) was accepted. This method overcome the drawback between the DNS method with the large amount of computation and RANS method with little versatility to a certain extent, describe turbulent in a high precision. Using a straight channel which was a common structre in engineer, the catalyst particles motion and mechanical characteristics and the movement of gas field were analyzed by making use of the combining PFC and CCFD. Analysis the simulation results, velocity distribution of catalyst particles, the drag force on the particles, the motion state of the gas field, the number of particle-particle and particle-wall collisions, particle kinetic energy changes can be obtained. Through PIV observation experiment and theoretical study reveals the dynamic characteristics of the catalyst particles inside the channel.