中文摘要：

在直径为O．476m的椭圆底搅拌槽中，采用直径为0．238m的单层六叶深凹叶盘式涡轮桨（HEDT），在液位为0.5m的全挡板条件下研究了沸腾状态下，蒸汽、去离子水和玻璃珠组成的汽-液-固体系中搅拌功率、气含率及固体颗粒完全离底悬浮特性，并与常温通空气三相体系进行对比。研究结果表明，沸腾条件下的流体动力学性能与常温通气体系相比存在较大差异。在沸腾条件下，搅拌功率消耗随着搅拌转速的增加有所下降，但HEDT桨具有较高的载气能力，即使在高叶端线速度下，相对功率消耗（RPD）仍能保持在较高的水平：沸腾体系的气含率随单位质量流体输入功率的增加表现出先增后减的规律，即存在气含率的极大值，蒸汽成核位置和固体颗粒悬浮特性随搅拌功率增加而改变是造成上述行为的主要原因；沸腾体系中的气含率远远低于常温通空气体系。临界悬浮搅拌转速（NJSG）随固相体积分率的增加略有增加；沸腾体系中蒸汽量的变化对NJSG影响远小于常温通气体系。研究结果对于工业沸腾态三相搅拌反应器的设计和操作具有一定的参考价值。

英文摘要：

In a full baffled stirred tank with inside diameter of 0.476 m and equipped with a half elliptical disk turbine （HEDT） as impeller, the agitation power consumption, gas hold-up and critical impeller speed for just complete off-bottom suspension of solid particles （NJSG） were measured for the boiling three-phase system and the cold gassed three-phase system, respectively. In these two three-phase systems, the deionized water, vapor or air and glass beads were used as the liquid, gas and solid phase, respectively. The experimental results show that the hydrodynamic characteristics of the boiling systems are quite different from those of the cold gassed ungassed systems. The agitation power consumptions in boiling systems decrease uniformly with the increase of agitation speed, whereas the relative power demand （RPD--the ratio of agitation power input of HEDT for gassed system to that for ungassed system and under the same agitation speed） can maintain at a high level for high gas loadings even when the impeller is operating with a high impeller tip speed. The gas hold-up in the boiling system is much lower than that in the cold gassed system, and the gas hold-up in boiling system increases at first and then decreases with the increase of the agitation power consumption per liquid mass （Pm）. It implies that the boiling three-phase system has a maximum gas hold-up point. The changes of nucleation site of vapour bubble and the character of suspension of the solid particles with the rotational speed of the impeller are responsible for those behaviors mentioned. In the boiling system, the critical impeller speed for just complete off-bottom suspension of solid particles （NJSD） increases a little with increasing solid loading and it also changes very slightly with increasing vapor generation rate. The above-obtained results have referential value for the design and operation of stirred reactors with boiling liquid.