基于DEM的振动筛筛孔形状对潮湿原煤筛分效果影响的研究

随着原煤含水量的增加,引起原煤颗粒间相互粘聚,影响振动筛筛分效率。基于离散元法,运用EDEM软件模拟了潮湿原煤颗粒在圆形筛孔、方形筛孔和矩形筛孔的筛分过程,并且以筛分效率和阻碍粒排出率为衡量指标,对振动筛筛孔形状影响潮湿煤筛分效果进行了研究。结果表明:在筛孔名义尺寸相同的情况下,潮湿煤在矩形筛孔筛面上的筛分效果最好,方形筛孔次之,圆形筛孔最差。

Study on influence of shape of sieving hole of vibrating screen on sieving effects of moist raw coal based on DEM

The increase of moisture in raw coal causes the cohesion of raw coal particles,and affects the sieving efficiency of the vibrating screen.Based on the DEM(discrete element method),EDEM was applied to simulate the sieving process of moist raw coal particles on round sieving hole,square sieving hole and rectangular sieving hole.And then,the sieving efficiency and the discharge ratio of obstructing particles being taken as the indicators,the influence of the shape of the sieving hole of the vibrating screen on the sieving effects of moist raw coal was researched.The results showed:at the same nominal size of the sieving hole,the sieving effects of moist raw coal on rectangular sieving hole was the highest,followed by square sieve hole,and round sieve hole is the worst.