加氢反应釜中的气含率等参数将直接影响加氢反应的效率，通过自吸式搅拌器可以实现气液高效混合。借助计算流体力学的方法，探究了30 m³自吸式加氢反应釜的气液两相流场分布特征、气含率、吸气量以及最佳吸气临界转速。研究结果表明:气相介质主要集中分布在反应釜中上部区域，整个搅拌混合过程在76s内达到稳定；液相中平均气含率达到10.64%，集中区域气含率可达13.47%，自吸式搅拌器的吸气量达到398 m³/h；吸气量随着搅拌转速的增加而呈现“先大幅度增加，后小幅增加，再趋于稳定”的特点，最佳吸气临界转速为167 r/min。
关键词: 自吸式搅拌器 / 气含率 / 流体力学 / 最佳吸气临界转速
Abstract:
Parameters such as gas holdup in the hydrogenation reactor directly affect the efficiency of hydrogenation reactions, and a self-priming agitator can achieve efficient gas-liquid mixing. By means of the computational fluid dynamics (CFD) method, the distribution characteristics of the gas-liquid flow field, gas holdup, air intake and the optimal critical air intake speed of a 30 m³ self-priming hydrogenation reactor were investigated. The results show that the gas-phase medium is mainly in the upper and middle parts of the reactor, and the entire stirring and mixing process reaches a steady state within 76 seconds. The average gas holdup in the liquid phase reaches 10.64%, and can reach 13.47% in the dense part. The air intake of the self-priming agitator reaches 398 m³/h, which goes up sharply, then slightly and lastly stabilizes along with the increasing stirring speed. The critical rotary speed at optimal air intake is 167 r/min.
Keywords: self-priming agitator / gas holdup / fluid dynamics / critical rotary speed at optimal air intake