Based on the realization of moving-bed cake filtering, the concepts of static-bed filtering time and moving-bed fil- tering time in the helical-conveyor fine coal filtering centrifuge were proposed, and the mathematic relations between the time defined and the main factors related were studied in detail. 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, while 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. The functions deduced are of great significance for fine coal filtering centrifuge＇s parameters determining and optimizing. It is shown that the filtering centrifuge with smaller spiral angle, smaller rotation rate deference, and smaller cone angle may do a better job for fine coal dewatering.
针对传统液固流化床对难选粗煤泥分选效果差的问题,构建了三产品液固流化床为主的试验系统,对难选粗煤泥的逐步分离过程进行研究。开展了不同参数条件下的单因素试验,探索了物料在下分选室初步分离及上分选室再次分离的分选过程,并将试验结果进行对比分析。研究结果表明:床层压力及上升水流对物料的分离分选影响显著,当下分选室床层压力12 k Pa、上升水量0.4 m3/h以及上分选室床层压力5 k Pa、上升水量0.1 m3/h时,尾煤灰分最高,精煤灰分最低,难选粗煤泥的分离分选效果最好。
