提升管催化裂化反应过程数值模拟

在气固两相流体动力学模型的基础上.采用基于机理反应的FCC14集总模型.考虑了反应温度、局部固体浓度变化以及流动对反应的影响,建立了重油流化催化裂化流动一一反应耦合模型.模拟结果表明,重油裂化反应主要发生在喷嘴附近区域,在喷嘴附近已经有45%的重油转化为汽油和柴油.随着距离喷嘴位置的增加,汽油产率逐渐上升,但距离喷嘴位置12m以后,汽油产率基本保持不变.从汽油组成变化来看,在整个提升管内汽油中烯烃含量一直处于下降趋势,由喷嘴区域的60wt%降低到提升管出口位置的42wt%左右.汽油烷烃含量一直呈增加趋势,而汽油中环烷烃含量和芳烃含量变化较小.

Numerical Simulation of Reaction Process in Commercial Riser Reactor

Besed on gas-solid two-phase turbulent flow model and the molecular kinetic FCC model,a three-dimension flow-reaction cou- pling model was derived to simulate the heavy oil cracking reaction in riser reactor.The simulation results show the primary reactions occurred at the oil-catalyst contact zone,which almost 45% heavy oil has converted to diesel and gasoline.The gasoline yield almost keeps the constant beyond the position that 12m from the feed location.The yield of olefin in gasoline on the basis of gasoline is decreased within the almost whole riser,from 60wt% in the nozzle zone decreasing to the value 42wt% in the riser outlet.The yield of Paraffin composition in gasoline basis of gasoline is increased gradually along the whole riser reactor.