中文摘要：

在直径为0.34 m的无挡板平底圆筒搅拌槽内,采用PBT和ZHX两种搅拌桨对固相体积分数为20%的玻璃微珠-水固液两相体系的悬浮特性进行试验研究.采用固体激光器和数码相机分别研究了搅拌桨离底间距和桨型,以及偏心搅拌时偏心率对固相颗粒的悬浮状态与悬浮临界转速及功率消耗的影响,得出了无论是同轴搅拌还是偏心搅拌,搅拌槽底部边缘角落区的颗粒都不能沿周向同时悬浮.搅拌桨离底间距较低有利于颗粒的悬浮,所耗功率愈小,在相同工况下固相颗粒的悬浮效果PBT型桨优于ZHX型桨,偏心搅拌时,颗粒悬浮临界转速和功率消耗均较同轴时的大,且随偏心率的增加而增大,因而,对高浓度固液两相体系的悬浮混合不宜采用偏心的搅拌装置操作.

英文摘要：

Solid-liquid suspension performance in a high solid concentration was investigated.An unbaffled,flat bottom,cylindrical glass vessel of diameter d=0.34 m equaling to the liquid height was used,which was stirred with two different axial flow impellers,a ZHX propeller and a 45° pitched blade turbine（PBT） impeller.The spherical glass particles of 150 μm were chosen as dispersed phase.The particle volume fraction was 20%.The states of suspension were observed and recorded using a digital camera.The just-suspended speed was determined by making visual observations through the base of the vessel illuminatedby a laser light source.The effects of impeller off-bottom clearance,type of axial impeller and eccentricity of the impeller in eccentric agitation operation on the solid suspension states,the just-suspended speed and power consumption were examined.The experimental results show that,either co-axial agitationor eccentric agitation,solid particles at the corners of the tank base can not suspend simultaneosly along circular direction.The suspension of solid particles in the stirred tank can be improved by decreasing impeller off-bottom clearance height.Solid particles reach the better suspension when using PBT than ZHX.The just-suspended speed and power consumption increase with increasing eccentricity in eccentric agitation operation.The eccentric agitation has no effective action to improve the suspension performance in a high solid concentration stirred tank.