双溢流管旋流器分离性能试验研究
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摘要
为满足氢氧化铝粗细晶种分级的要求,采用双溢流管旋流器,一次分级可得到底流、内溢流和外溢流三种产品,具有分级效率高、适应性强和能耗低等优点。本文首先对传统旋流器和双溢流管旋流器进行对比试验,然后重点研究内溢流管直径对双溢流管旋流器分离性能的影响。结果表明:较普通旋流器,双溢流管旋流器底流产率增大,得到的内溢流更细,可以获得窄粒级范围的细粒级产品;随内溢流管直径的增大,内溢流流量增大、产率提高,底流、内溢流和外溢流三种产品的粒度都有变粗的趋势,综合分级效率有所提高。
In order to meet the requirements for the classification of the coarse and fine seeds of aluminum hydroxide,a double-overflow cyclone is used.Three levels of the underflow,inner-overflow and outer-overflow can be obtained at a single stage,with high classification efficiency,adaptability and low energy consumption. First compare the traditional cyclone and double overflow cyclone,and then focuses on the influence of the diameter of the inner overflow tube on the separation performance of the double overflow cyclone. The results show that the underflow yield of the double overflow cyclone is higher than that of the conventional cyclone,and the inner overflow flow is finer. A fine-grained product in narrow grain size range can be obtained. As the diameter of the inner overflow tube increases,the overflow flow rate increases,the yield increases,and the underflow,inner-overflow and outer-overflow possess coarser granularity. The overall classification efficiency is improved.
In order to meet the requirements for the classification of the coarse and fine seeds of aluminum hydroxide,a double-overflow cyclone is used.Three levels of the underflow,inner-overflow and outer-overflow can be obtained at a single stage,with high classification efficiency,adaptability and low energy consumption. First compare the traditional cyclone and double overflow cyclone,and then focuses on the influence of the diameter of the inner overflow tube on the separation performance of the double overflow cyclone. The results show that the underflow yield of the double overflow cyclone is higher than that of the conventional cyclone,and the inner overflow flow is finer. A fine-grained product in narrow grain size range can be obtained. As the diameter of the inner overflow tube increases,the overflow flow rate increases,the yield increases,and the underflow,inner-overflow and outer-overflow possess coarser granularity. The overall classification efficiency is improved.
引文
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[11]Ghodrat M,Kuang S B,Yu A B,et al.Numerical analysis of hydrocyclones with different conical section designs[J].Minerals Engineering,2014,62(3):74-84.
[2]史玉娟,崔焱洲,王宁,等.拜耳法生产砂状氧化铝种子分解工序工艺[J].有色矿冶,2010,26(02):22-23+27.
[3]宋俊超,齐正义,姜维等.基于PIV技术的单体三产品重介质旋流器内部流场分析[J].选煤技术,2017(03):5-9.
[4]Zhang Y K.LIU P K.Yang X H.Study on effect of the inner vortex finder length on the flow properties of the hydrocyclone with double vortex finders[J].Functional Materials,2016,23(3):502-508.
[5]Obeng D P,Morrell S.The JK three-product cyclone-performance and potential applications[J].International Journal of Mineral Processing,2003,69(1):129-142.
[6]杜振宝.新型双溢流水力旋流器分级试验研究[J].选煤技术,2015(06):12-15.
[7]朱庆庆,杨建国,王兴兴.筛网旋流器透筛机理研究[J].煤矿机械,2011,32(08):38-40.
[8]Mahmoud M A,Galal A I,Mohamed G F.Performance of a threeproduct hydrocyclone[J].Miner Process,2009,91(1):34-142.
[9]刘鸿雁,王亚,韩天龙等.水力旋流器溢流管结构对微细颗粒分离的影响[J].化工学报,2017,68(05):1921-1931.
[10]Song J,Wei Y,Sun G,et al.Experimental and CFD study of particle deposition on the outer surface of vortex finder of a cyclone separator[J].Chemical Engineering Journal,2017(309):249-262.
[11]Ghodrat M,Kuang S B,Yu A B,et al.Numerical analysis of hydrocyclones with different conical section designs[J].Minerals Engineering,2014,62(3):74-84.