立式螺旋煤泥过滤离心机脱水时间模型研究

Research on Dewatering Time of the Helical Slime Filtering Centrifuge

根据立式螺旋煤泥过滤离心机的工作特点,提出了静态过滤时间和动态过滤时间的概念,推导了静态过滤时间、动态过滤时间与主要结构参数之间的函数关系,分析了主要参数的影响趋势并进行了验证.结果表明:沉降成饼时间是螺旋头数和相对速差的函数,对滤层厚度、阻力及滤层截留效应影响显著;动态过滤时间是螺旋升角、回转速差、过滤转鼓半锥角及过滤转鼓半径的函数,对滤层运动行为及脱水效果影响显著.采用小升角螺旋、降低转速差、增大转鼓高度有利于延长动态过滤时间、改善脱水效果.建立的模型对细煤泥过滤离心机的设计、优化具有指导意义.

Based on the realizing and controlling of moving-bed cake filtering, the concepts of static-bed filtering time and moving-bed filtering time in the helical slime filtering centrifuge were proposed. The function relations between the times defined above and the main factors related were deduced. The results show that the static-bed filtering time is the function of the spiral heads and the rotation rate deference between the spiral and the porous drum, which has remarkable effects on the thickness, resistance and withhold of cake. The moving--bed filtering time is the function of the cone angle of the porous drum, the radius of the porous drum, the spiral angle, and the rotation rate deference, which has remarkable effects on moving and dewatering efficiency of cake. The machine with smaller spiral angle, rotation rate deference, and cone angle may do a better job for slime dewatering. The functions deduced are meaningful for parameters designing and optimizing of the helical slime filtering centrifuge.