钻井液振动筛作为一级固相控制设备,常存在"筛堵""筛糊"和"跑浆"等问题,而通过改变"力心"和质径积比值等参数来得到合理的变椭圆振动轨迹,可以较好解决这些问题.针对变椭圆轨迹振动筛的结构参数改变要求,研究其对振动轨迹和颗粒行为的影响,并基于离散元法(Discrete Element Method)的耦合多体系统动力学(Dynamics of Multi-body System)研究方法,对变椭圆振动筛本体和物料颗粒进行联合分析求解;分析了变椭圆振动筛力心位置和偏心块质径积比值对振动轨迹、物料颗粒运移速度和透筛率的影响.结果表明:振动筛在力心与质心的距离在100～150 mm,偏心块质径积比值在10 ∶ 7 左右,入料端最大椭圆倾角在60°～65°时,变椭圆振动筛可以达到较好的筛分性能.研究结论可为变椭圆振动筛的设计提供理论支持.
Numerical Simulation on Sieving Performance of Variable-Ellipse Shale Shaker
As a primary solid control equipment,the shale shaker often faces problems such as screen blind-ing,screen pasting and mud runaway.These problems can be solved by obtaining a reasonable variable-ellipse shaking trajectory through changing the parameters such as force center and mass-radius product ratio.The influ-ence of the change in structural parameters of variable-ellipse shale shaker on the shaking trajectory and particle be-havior was studied.Then,the discrete element method(DEM)was coupled with the dynamics of multi-body sys-tem(MBD)for joint analysis on the variable-ellipse shale shaker and material particles.Finally,the influences of force center position of variable-ellipse shale shaker and mass-radius product ratio of eccentric block on the shaking trajectory,material particle migration velocity and sieving rate were analyzed.The results show that the variable-el-lipse shale shaker can achieve good sieving performance when the distance between the force center and the mass center is 100～150 mm,the mass-radius product ratio of eccentric block is about 10 ∶ 7 and the maximum elliptical inclination angle at the feeding end is between 60° and 65°.The research findings provide theoretical basis for the design of variatle-ellipse shale shoker.
万方数据
维普
