摘要：通过理论与试验相结合的方法研究粒径为13～6 mm的末煤浅槽分选中存在的分选效率低, 布水板堵塞的难题, 得到最佳操作参数。研究结果表明, 当悬浮液密度分别为1.4、1.5、1.6、1.7 g/cm³时, 对于粒径为13～6 mm的入料颗粒, 所需的最小上升水流速度为6.3～11.4 cm/s;最佳水平流与上升流流速比值分别为2.0～2.5 (ρ=1.4、1.5 g/cm³) 和1.5～2.0 (ρ=1.6、1.7 g/cm³) ;给料位置距布水板高度H_i与液面高度H₀的比值为0.7, 距给料口长度L_i与分选室长度L0的比值为0.1～0.3时, 灰分离析度最高;在最优条件下, 分选精度分别为0.097、0.071、0.068、0.089 g/cm3, 精煤灰分分别为8.55%、8.87%、9.15%和9.54%。

关键词：重介浅槽；末煤分选；上升水流

Abstract：The pr oblem of low separation efficiency and blocked water distributor was studied by the combining method of theory and experiment, and optimum operating parameters werefound. Research shows, when the suspension density is 1.4, 1.5, 1.6, 1.7 g/cm³ respectively, for the 13～6 mm feeding particles:the required minimum flow velocity of upward water is 0.63～1.14 cm/s. The optimal ratio between horizontal and vertical flowrate is 2.0～2.5 (ρ=1.4 or 1.5 g/cm³) and 1.5～2.0 (ρ=1.6 or 1.7 g/cm³) ;the optimum feeding position is vertical ratio equals 0.7 between height Hiabove the water distributor and the suspension height H₀, and the horizontal ratio belongs 0.1～0.3 of distance Lifrom the feeding port and length L₀ of sorting chamber; Under the optimal conditions, the Ecart probable moyen is 0.097, 0.071, 0.068 and0.089 g/cm³ and the ash content is 8.55%, 8.87%, 9.15% and9.54%, respectively.

Keywords：heavy medium vessel；slack coal separation；rising water