CAJ | 학술논문

重介质旋流器在选煤领域中已得到广泛应用.根据硅和碳化硅等不同密度微细颗粒易团聚且难用化学方法分离的特点,本文选用重介质微型旋流器对其进行分离.为探索重介质微型旋流器的流场特性,本文基于CFD软件Fluent对重介质微型旋流器的切向速度场进行了数值模拟研究,考察了介质的密度及黏度对旋流器内切向速度的影响.结果显示,密度不变,黏度增大,切向速度减小,且旋流器直径越小,切向速度减小越快,即旋流强度衰减得越快.虽然黏度不变时密度的增大会导致切向速度的增加,但当密度和黏度按实际重介质溶液同时增大时,黏度对切向速度的影响远大于密度的影响.
중개질선류기재선매영역중이득도엄범응용.근거규화탄화규등불동밀도미세과립역단취차난용화학방법분리적특점,본문선용중개질미형선류기대기진행분리.위탐색중개질미형선류기적류장특성,본문기우CFD연건Fluent대중개질미형선류기적절향속도장진행료수치모의연구,고찰료개질적밀도급점도대선류기내절향속도적영향.결과현시,밀도불변,점도증대,절향속도감소,차선류기직경월소,절향속도감소월쾌,즉선류강도쇠감득월쾌.수연점도불변시밀도적증대회도치절향속도적증가,단당밀도화점도안실제중개질용액동시증대시,점도대절향속도적영향원대우밀도적영향.
Heavy medium cyclones have been widely used in the field of coal preparation. The fine particles of Si and SiC in different densities are likely aggregated,resulting in difficulties in chemical separation. This paper presented an experiment in the separation of Si particles from SiC particle using a heavy medium mini-cyclone. Simulation of the tangential velocity in the heavy-media mini-cyclone was conducted in order to study the flow field characteristics,and the influences of density and viscosity on the tangential velocity in the cyclone. The simulation software was CFD Fluent. Results showed that the influences of the viscosity were greater than the density. The tangential velocity increased when the density of the heavy medium increased. The tangential velocity decreased with the increase in the viscosity of the heavy medium. The swirling decayed more quickly in smaller cyclones.