渣油催化裂化工业提升管反应器的数值模拟

应用渣油催化裂化提升管反应器三维气固两相流动、传热及反应的数值模型，对工业提升管反应器进行了全面系统的数值模拟计算，得到了提升管反应器“灰箱”内部的流动、传热及催化裂化等信息，初步揭示了催化裂化提升管反应器内部流动、传热及反应过程之间高度耦合、相互影响的基本特性。模拟结果表明，在提升管内气固两相沿轴向、径向和切向都存在着浓度、速度及温度变化梯度，这是造成催化裂化反应速度分布不均匀的主要原因。提升管的进料段是裂化反应最复杂的区域。在喷嘴上方５～１０ｍ处原料油反应基本结束，柴油产率最大值出现在提升管中下部，汽油产率最大值出现在中上部。提升管出口处反应温度及各组分浓度的模拟计算值与工业装置数据相一致，这说明该模型对工业提升管反应器具有较好的预测性，同时也验证了它的可靠性及合理性。

NUMERICAL SIMULATION ON COMMERCIAL FCC RISER REACTOR

A model for gas solid two phase flow, heat transfer and reaction of FCC riser reactor was used to simulate numerically the processes of flow, heat transfer and catalytic cracking reaction of three commercial RFCC. The detailed information about the main characteristics of the interaction of flow, heat transfer and reaction were obtained. The concentration, temperature and velocity in the axial, radial and tangential directions of riser are unsteady, which causes the non uniform distribution of velocity of cracking reactions. The most complex part of RFCC is in the feed injection zone. The calculated results for outlet parameters of reactor are in agreement with the commercial data, which gives a proof for the validation and good predictability of the two phase flow, heat transfer and reaction.