立式圆槽内多轴搅拌器固-液悬浮性能

在直径(T)为2 m、高(H)为0.8 m的圆形搅拌槽内，采用三桨搅拌，桨型为CBY III(桨径D=0.174 m)，3个桨在槽内均匀分布，通过对临界悬浮叶端线速度、沉积面积的分析，研究了搅拌桨槽内最优安装位置. 结果表明，最优径向安装位置为距壁面0.285R(R为圆形搅拌槽半径，m)处；液位为0.3T时的搅拌效果优于0.2T和0.25T；但液位在一定(0.2T~0.3T)范围内对功率的影响微小. 对比分析实验结果与文献数据可知，达到相同完全悬浮状态，立式多轴搅拌的功率消耗为单轴情况下(D=0.731 m)的2.8倍，但立式多轴搅拌器的制造成本更低；与侧伸式搅拌相比，5%沉积面积时立式多轴搅拌节省20%能耗，且安装维护更简便，在大型储罐中具有广泛的工业应用前景.

Solid-Liquid Suspension in a Vertical Three-impeller Stirred Tank

In order to improve the related efficiency in a storage tank, the solid-liquid suspension by three CBY III impellers 0.174 m diameter (D)] was studied. The three CBY III impellers were symmetrically fixed in a stirred tank with the diameter (T) of 2 m and height of 0.8 m. The optimum installing location and height of agitators were determined by analyzing the deposition area and just-suspension blade tip speed for glass beads of average 100 μm. The results show that the minimum just-suspension speed appears at 0.285R (R, the radius of tank, m) away from the tank wall, and the liquid level of 0.3T is superior to the situations of 0.2T and 0.25T, meanwhile the liquid level between 0.2T and 0.3T has only weak influence on power consumption. The power consumption of vertical three-impeller stirred tank is 2.8 times as that of standard stirred tank (single vertical agitator), but a vast of manufacturing cost can be saved. Compared with the three side-entering agitators, the vertical three-impeller agitation can save 20% of the energy when solids have 95% suspension, and installation and maintenance are very convenient and concise. It can be concluded that the vertical three-impeller agitation has an extensive application prospect in industrial storage tanks.