末煤浅槽分选下限多因素分析及试验研究
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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/cm~3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/cm~3)和1.5～2.0(ρ=1.6、1.7 g/cm~3);给料位置距布水板高度H_i与液面高度H_0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%。
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/cm~3 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/cm~3) and 1.5～2.0(ρ=1.6 or 1.7 g/cm~3);the optimum feeding position is vertical ratio equals 0.7 between height Hiabove the water distributor and the suspension height H_0,and the horizontal ratio belongs 0.1～0.3 of distance Lifrom the feeding port and length L_0 of sorting chamber; Under the optimal conditions, the Ecart probable moyen is 0.097, 0.071, 0.068 and0.089 g/cm~3 and the ash content is 8.55%, 8.87%, 9.15% and9.54%, respectively.
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/cm~3 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/cm~3) and 1.5～2.0(ρ=1.6 or 1.7 g/cm~3);the optimum feeding position is vertical ratio equals 0.7 between height Hiabove the water distributor and the suspension height H_0,and the horizontal ratio belongs 0.1～0.3 of distance Lifrom the feeding port and length L_0 of sorting chamber; Under the optimal conditions, the Ecart probable moyen is 0.097, 0.071, 0.068 and0.089 g/cm~3 and the ash content is 8.55%, 8.87%, 9.15% and9.54%, respectively.
引文
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[2]文茂.重介浅槽分选技术在洗煤厂中的研究与应用[J].能源与节能,2018(1):184-185.
[3]黄振源.浅槽重介分选工艺在选煤厂的运用[J].煤炭科技,2017(2):117-118.
[4]周昭军.滚子链在浅槽分选机中的应用分析[J].煤炭加工与综合利用,2017(7):40-43.
[5]黄亚飞.降低浅槽重介分选机入料粒度下限的探讨[J].选煤技术,2017(2):56-58.
[6]郑均笛.煤泥减量化综合分析[J].煤炭加工与综合利用,2015(11):1-3.
[7]董卫红.重介浅槽分选机在凉水井煤矿选煤厂的应用[J].煤炭与化工,2017,40(6):86-88.
[8]贺民强,程国锋,刘家宝.重介浅槽分选机的原理及应用分析[J].能源与节能,2014(6):133-135.
[9]李晓军.济三选煤厂浅槽选矸作业入料粒度下限的探讨[J].煤炭加工与综合利用,2014(7):40-42.
[10]白光超,毕思锋,温朋朋.大型煤矿井下重介浅槽煤矸分离系统设计[J].煤炭工程,2016,48(5):24-26.
[11]谢广元.选矿学[M].徐州:中国矿业大学出版社,2016:110.
[12]周恩会,赵跃民,段晨龙,等.变径分选床中等沉颗粒的运动特性与分离机制研究[J].环境污染与防治,2013,35(10):29-32.
[13]魏占强.不连沟选煤厂降低浅槽重介质分选机分选下限的可行性分析[J].选煤技术,2017(1):70-72.
[14]班海俊.李家壕选煤厂降低重介浅槽入洗下限的工业试验研究[J].煤炭加工与综合利用,2017(5):25-32.
[15]荆萍.红庆梁选煤厂降低块煤入选下限的研究[J].洁净煤技术,2013,19(6):21-24.
[16]谭明兵,贺靖峰,邵换男,等.次生布风条件下气固重介质流化床褐煤分选提质研究[J].中国矿业大学学报,2017,46(2):404-409.
[17]周俊,孙培林.张家峁选煤厂准备车间改造分析[J].洁净煤技术,2015,21(5):38-41.