螺旋分选机结构参数对最佳入料粒度范围的影响探究

Study on influence of structural parameters of helical sorter on optimal feeding granularity range

以山西吕梁某选煤厂粗煤泥为研究对象,探究螺旋分选机结构差异对最佳入料粒度范围的影响,分别改变螺旋圈数、螺距和螺旋直径进行试验研究。结果表明:随着入料粒度的减小,精煤灰分呈先降低后升高的趋势,可燃体回收率呈先增高后降低的趋势。螺旋圈数的增加使得最佳入料粒度范围略微有变大的趋势,但最佳入料粒度范围总体保持在2~0.25 mm之间,在这个范围内,精煤灰分基本保持在10%以下,可燃体回收率可达60%以上。最佳入料粒度范围随螺距的增大有着变小的趋势,当螺距小时,最佳入料粒度范围在2~0.5 mm;当螺距大时,最佳入料粒度范围在1~0.25 mm。直径的变化对最佳入料粒度范围的影响不大,最佳入料粒度范围总体保持在2~0.25 mm。因此,实际生产过程中可以根据螺旋分选机的结构改变入料粒度范围来强化分选效果。

The spiral sorting machine because of its structure difference,is bound to bring the sorting effect difference.In order to explore the influence of the structural difference of the spiral separator on the optimal feeding particle size range,the coarse slime from a coal preparation plant in Luliang,Shanxi Province,was taken as the research object,and the number of spiral coils,pitch and diameter of the spiral were respectively changed for experimental research,the results show that with the decrease of the into the grain-size,plant ash content was lower before rising trend,the burning body recovery are set to increase after the fall.The increase of the number of spiral rings makes the optimal feeding particle size range slightly larger and wider,but the optimal feeding particle size range generally remains between 2 and 0.25 mm.Within this range,the cleaned coal ash content is basically kept below 10%,and the recovery rate of combustible material can reach more than 60%.The optimal feeding particle size range tends to decrease with the increase of screw pitch.When the screw pitch is small,the optimal feeding particle size range is 2~0.5 mm.When the screw pitch is large,the opti-mal feeding particle size range is between 1 and 0.25 mm.The change of diameter has little effect on the optimal feeding particle size range,and the optimal feeding particle size range generally remains between 2 and 0.25 mm.Therefore,the sorting effect can be enhanced by changing the feeding granularity range according to the structure of spiral separator in the actual production process.