水介质流化床粗煤泥分选机流态化的研究

发布时间：2018-05-28 23:45

本文选题：粗煤泥 + 干扰沉降　；参考：《黑龙江科技大学》2015年硕士论文

【摘要】：水介质流化床分选机内部流态化的分布规律是研究水介质流化床粗煤泥分选的理论基础。通过颗粒的受力分析和沉降末速的具体测定,来研究水介质流化床分选机内部流态化的分布,旨在找出粗煤泥在干扰沉降中的实验指数n值、干扰沉降速度,分选机内固体容积浓度、以及对所分选出的粗煤泥密度分布规律。本文通过南山选煤厂3.0~2.0mm、2.0~1.0mm、1.0~0.25mm粗煤泥对水介质流化床进行试验分析得出:初始流态化速度随着粗煤泥粒度、密度的增大而增大,粗煤泥的粒度越小床层膨胀度随上升水流流速的变化越明显;实验指数n随着干扰沉降速度的增大而增大,随着细煤泥含量及粗煤泥粒度的增大而减小;在本试验中的容积浓度下,1~0.25mm粒级的粗煤泥干扰沉降末速为29.47~88.42mm/s,2.0~1.0mm粗煤泥为39.30~108.07 mm/s,3.0~2.0mm粗煤泥为49.12~137.54mm/s。为了进一步研究现场水介质流化床实际分选时的流态化情况,在实验室研究的基础上,对现场工业化的LHC-2400型水介质流化床分选机进行取样分析。通过分析得出:LHC-2400型水介质流化床在分选粗煤泥时,粗煤泥容积浓度随着床层高度的增加而减少,细煤泥容积浓度随着床层高度的增加而增大。0~600mm为矸石区,600~1300mm为流态化分选区,1300mm以上为溢流区,存在明显的矸石层与分选层分离带,有利于粗煤泥的分选回收。分布在分选机内部600mm以上高度的粗煤泥密度为1.3g/cm3;与之相反,600mm以下密度急剧上升,两者之间的显著差异有利于分选机对粗煤泥的分选。
[Abstract]:The distribution of fluidization in fluidized bed separator is the theoretical basis for studying the separation of coarse coal slime in water medium fluidized bed. The distribution of fluidization in fluidized bed separator is studied by analyzing the force of particles and measuring the final velocity of settlement. The purpose of this paper is to find out the experimental index n value and the velocity of interference settlement of coarse coal slime in the interference settlement. The solid volume concentration and the density distribution of coarse slime in the separator. In this paper, through the test and analysis of the fluidized bed in water medium with 3.0 ~ 2.0mm ~ 2.0mm ~ 1.0mm ~ 1.0mm ~ 1.0mm coarse slime in Nanshan Coal preparation Plant, it is concluded that the initial fluidization rate increases with the increase of coarse coal particle size and density. The smaller the particle size of coarse coal slime, the more obvious the change of bed swelling degree with the rising flow velocity, the experimental index n increases with the increase of interference settling velocity, and decreases with the increase of fine coal slime content and coarse slime particle size. Under the volumetric concentration of 0.25mm coarse slime, the final settlement velocity of coarse slime is 29.47 ~ 88.42mm / s ~ (2.0) mm / s ~ (1.0) mm = 39.30 / 108.07 mm / s ~ 3.0 ~ 2.0mm coarse slime = 49.12 ~ 137.54mm / s. In order to further study the fluidization of water medium fluidized bed in the field, on the basis of laboratory research, the LHC-2400 type water medium fluidized bed separator was sampled and analyzed. Through analysis, the volume concentration of coarse slime decreases with the increase of bed height in the separation of coarse slime in the water medium fluidized bed of type 1: LHC-2400. The volume concentration of fine coal slime increases with the increase of bed height. The volume concentration of fine coal slime increases with the increase of bed height. The density of coarse slime distributed above the height of 600mm in the separator is 1.3 g / cm ~ 3; on the contrary, the density below 600mm increases sharply, and the significant difference between the two is beneficial to the separation of coarse coal slime.
【学位授予单位】：黑龙江科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD94;TD45

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