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针对近年来选煤过程中亟待解决的高灰细泥影响分选效果难题,进行了三产品旋流分级筛脱泥性能研究.论文以旋流两相流和颗粒透筛理论为基础,首先对颗粒运动进行分析,得出离心沉降相对末速、最大分级粒度及粒度分布规律;然后对脱泥性能影响较大的溢流管进行试验,得到当溢流管插入深度为475mm(柱-锥分界面)、最小溢流管内径为柱段内径的0.075~0.15倍时,细泥(-45μm)脱除率较高为90%;最后对比平衡轨道理论分级模型与实际分级粒度,确定内旋流波瓦罗夫公式为适合该设备脱泥特性研究的理论分级模型.
In order to solve the problem of separation effect of high ash fine mud which needs urgent solution in the process of coal preparation in recent years, the desilting performance of the three product cyclone graded sieve was studied.Based on the theory of two-phase flow and particle sieving, The results showed that when the overflow pipe is inserted into the overflow pipe with a depth of 475mm (column-cone Interface). When the inner diameter of the smallest overflow pipe is 0.075 ~ 0.15 times the inner diameter of the column section, the removal rate of fine mud (-45μm) is 90% higher. Finally, by contrasting the theoretical equilibrium model of the orbital path with the actual classification granularity, The Boworov formula is a theoretical grading model suitable for the deslagging characteristics of this equipment.