下行床及提升管催化裂化数学模拟

该文提出了一维轴向扩散模型，并结合气因循环流化床中下行床及提升管的基本流体力学规律与四集总反应动力学模型，对提升管及下行床反应器用于瓦斯油催化裂化过程进行了模拟。计算结果表明，气体轴向运混对汽油收率有很大影响，汽油收率对Ｐｅｃｌｅｔ准数在０．１～１０００之间时变化较敏感。相同条件下，瓦斯油的转化率在 Ｐｅ＝４（提升管）中比 Ｐｅ＝ １００（下行床）约低 １０％。当瓦斯油的转化率提高时，气体轴向运混对汽油收率的影响更大。

Numerical calculation for fluid catalytic cracking in downer and riser

A dimensional axial dispersion model for the fluid catalytic cracking(FCC) is proppseed. The model combines the four - lump kinetics and the hydrodynamic models for both riser and downer to predict the reaction performance of gas oil catalytic cracking in. downer and riser. The results show that the axial dispersion has largeinfluence on the gasoline yield of the reactor. The gasoline yield will change sensitively with the Pecler number between 0 1 and 1000. Under the same conditions, on the other hand, conversion of gas oil will increases approximately 10% when the Peclet number changes from 4(riser) to 100(downer). The higher theconversion of gas oil, the larger influence which the axial dispersion will have on the gasoline yield.