摘要
为了研究无压三产品重介质旋流器内空气柱的形态和变化规律,利用计算流体力学软件Fluent,采用非稳态的雷诺应力模型一段旋流器结构参数和操作参数对空气柱的影响,进而分析对能耗和分选的影响。结果显示旋流器内部空气柱在21.67s时基本成型,二段旋流器先于一段旋流器形成空气柱;入料速度小于4m/s旋流器内部无法形成空气柱,超过临界速度后旋流器内部可以形成完整稳定的空气柱,过大的入料速度会使得一段旋流器内空气柱体积百分数减少,二段旋流器内空气柱体积百分数增加,一段旋流器内空气柱不贯通;一段旋流器溢流管直径为380mm,溢流管插入深度在410~610mm范围,旋流器内空气柱体积分数较低,空气柱摆动较小稳定性强。
In order to study the morphology and variation of the air core in the gravity-fed three-product heavy medium cyclone,the unsteady Reynolds stress model was used to simulate the influence of structure parameters and operating parameters of the first-stage cyclone on the air core,and then the impact on energy consumption and separation was analyzed. The results show that the internal air core of the cyclone is basically formed at 21. 67 s,and air core forms the second-stage cyclone before the first-stage cyclone. Air core can’t form in the cyclone when the feed velocity is less than4 m/s,and complete and stable air core forms when the feed velocity exceeds critical velocity. While excessive feed velocity will reduce the volume percentage of air core in first-stage cyclone,and lightly increase volume percentage of air core in the second-stage cyclone. The diameter of the overflow pipe of first-stage cyclone is 380 mm,the insertion depth of the overflow pipe is in the range of 410 ~ 610 mm,the volume percentage of air core is lower,the air core is small and the stability is strong.
作者
黄波
黄国桂
HUANG Bo, HUANG Guo-gui(School of Chemical and Environmental Engineering, China University of Mining and Technology （Beijing）, Beijing 100083, China)
出处
《煤炭工程》
北大核心
2018年第5期114-117,共4页
Coal Engineering
