摘要
以小于1.0mm的粗煤泥为研究对象,利用实验室自制的充气搅拌式浮选机进行单元浮选试验,探讨了叶轮转速和充气量对宽粒级煤泥浮选的影响。研究结果表明,当充气量为400L/h及叶轮转速为1000r/min时,浮选精煤产率和可燃体回收率最大,并可以利用MATLAB数值计算软件拟合出浮选参数的关系。同时从颗粒与气泡碰撞和附着概率的角度分析了叶轮转速和通气量对浮选过程的影响,在一定范围内充气量和转速的增大有助于宽粒级煤泥的浮选,但充气量以及叶轮转速过高时浮选效果变差。最后,采用流体动力学模拟软件FLUENT14.5模拟出该浮选槽的流场,通过对比浮选机内部气相与水相的湍流度云图后发现与试验结果相符合。
The object of study is coarse slim which size below 1.0 mm. The authors conduc- ted a unit laboratory flotation within laboratory-made air-blowing flotation machine and discussed effects on wide size fraction coal slim floatation which impacted by impeller speed and inflating volume. The results showed that when the inflating volume is 400 L/h and impeller speed is 1000 r/min, the productive rate of clean coal floatation and the combustible material recovery are maximum. The authors fitted the relationship of floatation parameters by using MATLAB nu- merical recipes software, and also analyzed the effects on floatation process of impeller speed and ventilation volume from perspective on probabilities of collision and adhesion of particles and bub- bles. The results indicated that increasing inflating volume and rotate speed were contribute to wide size fraction coal slim floatation, but when inflating volume and rotate speed were over highly, the floatation effects were worse. Furthermore, the authors used fluid dynamics simula- tion software FLUENT14.5 to simulate flow field of the flotation cell. The results were con- sistent with the experimental phenomena.
出处
《中国煤炭》
北大核心
2015年第5期99-104,共6页
China Coal
基金
山西省科技攻关资助项目(20080321066)
山西省科技创新计划资助项目(2010102010)
关键词
叶轮转速
通气量
宽粒级煤泥
流场模拟
impeller speed, inflating volume, wide size fraction coal slim, flow field simulation
