稠密气体理论在催化裂化提升管中的应用

THE APPLICATION OF THE DENSE GAS THEORY FOR THE NUMERICAL SIMULATION OF FCC RISER REACTOR

运用已建立的颗粒动力学模型并耦合催化裂化反应的十三集总动力学模型 ,建立了催化裂化提升管反应器内反应油气和催化剂颗粒相的传质、传热、反应的数学模型 ,结合工业提升管的操作参数 ,模拟预测了速度场、温度场和组分分布。模拟结果表明 ,提升管内速度、温度无论是轴向还是在横截面上都存在明显的非均匀分布 ,特别是喷嘴附近 ,气粒回流严重 ,温度梯度存在双峰特征 ,汽油、柴油浓度迅速增长。模拟计算结果和工业实测数据基本一致。

Employing the developed kinetic model of granular flow and coupling the 13 lumping model of catalytic cracking ,a advanced mathematics model on mass transfer, heat transfer and reaction in the FCC riser reactor was developed. Using the operational parameters of commercial riser reactors, the vector field, temperature field and the composition distribution of gas phase along the height of the bed were obtained. It was demonstrates by the simulations that the distributions of velocity and temperature was heterogeneous whether in the axial direction or on the cross section. Especially, it was also indicated clearly that gas and catalysts refluence and their temperature gradient exists“two apices”and the concentration of gasoline and diesel increases rapidly at the nozzle zone. Comparison revealed that the simulated results are consistent with the commercial results. [WT5HZ]