催化裂化提升管反应器流动反应模型的建立

APPLICATIONOF KINETIC THEORY FOR GRANULAR FLOW TO DEVELOPMENT OF FLOW REACTION MODEL IN RISER REACTOR

基于流体力学和稠密气体分子运动的基本理论 ,建立了气粒两相流的颗粒动力学模型 ,并结合催化裂化反应的集总动力学模型建立起催化裂化提升管反应器内原料油气和催化剂颗粒两相流传质、传热、反应的三维模型 ,用于考察提升管内催化裂化反应历程。给出了模型方程的数值解法、边界条件和差分方法 ,编制了模拟计算程序。模拟计算了催化裂化提升管反应器喷嘴附近催化剂颗粒的流动特征。模型的计算结果与炼油厂实际标定的提升管出口组分浓度相一致 ,表明了模型的合理性。对喷嘴附近催化剂颗粒流动特征的考察表明 ,催化剂的速度存在极度的非均匀性分布 。

Based on the hydrodynamic theory and Chapman Enskog theory of dense gases and gas particle two phase turbulent flow granular model, a three dimensional flow reaction model for FCC riser reactor is developed by using thirteen lumping model of catalytic cracking. Turbulent fluctuation of gas and particles, particle particle collisions, intense interaction and mass transfer and heat transfer between gas and particles, as well as gas reaction are taken into account comprehensively. Initial and boundary conditions are discussed, and the related numerical solution is presented. The present model can be applied to numerical researches on the turbulent flow in circulating bed riser and the design or optimization of catalytic cracking riser reactor. Hydrodynamics of catalyst near nozzle in FCC riser reactor is simulated and calculated using this model. Calculated result of product concentration at outlet of the riser is consistent with that of actual experiment.