粘性物料的搅拌

介绍了粘性物料在低速搅拌时的流型和桨叶形式。对高速状态下的粘性物料，特别是有固相存在的搅拌进行了试验研究。提出了流向改变和碰撞过程。推荐了几种用于粘度较大，尤其含固相较高的粘性物料的搅拌桨、搅拌槽和挡板形状。通过试验对桨叶直径、转速、层数、宽度各参数进行了合理选择，找出了提高效率、节约能耗的合理参数，并提出了高效节能的窄叶桨。通过流体力学分析和试验提出了固体颗粒悬浮液的“颗粒因数”对搅拌功率的影响，根据实验数据回归，提出了圆盘桨和窄叶桨当桨叶宽度、层数、液深改变时的功率修正系数。

STIRRING OF VISCOUS MATERIALS

he flow pattern and impeller type at lower stirring speed are introduced for the viscous materi-als.For stirring the viscous materials at higher speed,especially those containing solid pliase,the flowpattern and philosophy are described and the exchange of flow direction and collision process are pro-posed by experimental studies,and several kinds of stirring impellers,stirring cells and baffles applica-ble to the viscous materials,especially to the high solid phase containing materials,are proposed.Based on the experimental results,reasoilable selections of the parameters such as diameter,rotatingspeed,number of layer and width of the impeller are carried out,and the related parameters are foundout for improving efficiency and energy saving.As a result,a narrow impeller with high efficiencyand low anergy consumption is proposed. For calculating the stirring power,the effects of“particle factor”of suspended solution with solidparticles on the stirring power are proposed on the basis of hydraulic analysis and tests.The modifiedcoefficlents are given by regress of the experimental data for disc impeller and narrow impeller due tochanges of width,layer number and depth of liquid.