垂直-倾斜组合立管中催化剂下料特征分析

以催化裂化装置典型的垂直-倾斜组合立管(Φ80 mm×3600 mm)为研究对象,通过试验分析在不同催化剂质量流率下立管内催化剂颗粒的流动状态及其演变过程;并通过分析立管内轴向时均压力和动态压力特性,对催化剂颗粒的流态进行辨识.结果表明:随着催化剂质量流率的增加,立管内催化剂颗粒由稀相流态过渡为密相流态,轴向压力梯度逐...

ANALYSIS OF CATALYST FLOW CHARACTERISTICS IN VERTICAL- INCLINED COMBINED STANDPIPE

A typical vertical-inclined combined standpipe with length of 3 600 mm and diameter of 80 mm was built to investigate the flow patterns of catalyst particles and their evolution under various mass flow rates. The flow patterns were identified by the distribution of the axial pressure and dynamic pressure. The results indicated that with the increase of the catalyst mass flow rate, the flow patterns of catalyst particles in the riser were changed from dilute to dense phase flow, and the axial pressure gradient was gradually decreased. When the catalyst mass flow rate was 720 kg/(m².s), the axial pressure was reversed with the filling flow at the bottom of the risers. The filling flow can be avoided by setting the aerating air. The main frequency range of different flow patterns is 0 - 0.5 Hz.