摘要
针对煤泥矿化程度低导致的浮选效率低等问题,提出一种新型反击式环空喷射吸气搅拌器。利用水力反击原理,设计了新型反击式环空喷射吸气搅拌器以及30°、45°、90°3种喷嘴角度,利用FLUENT软件对3种喷嘴角度时搅拌器内压力及速度分别进行了二维数值计算,并对比分析了3种喷嘴角度在不同的射流速度下的流场分布特征,以及压力、速度等流体力学参数。研究表明,当喷嘴角度为45°时,搅拌区域内压力和速度云图分布合理,相邻喷嘴及叶轮叶片之间负压较低,利于空气相吸入;由于漩涡的存在,在一定程度上提高矿化效果,漩涡也使得矿浆形成死循环,可进一步试验进行研究。
In view of low flotation efficiency of coal slime due to poor mineralization, a new-type reaction- typed annular jet-suction agitator was proposed. Based on the principle of hydraulic reaction, the reaction-typed annular jet-suction agitator and three kinds of nozzle angle of 30° , 45° and 90° were designed. Moreover, FLUENT was applied to conduct 2D numerical calculation of pressure and velocity inside the agitator at three kinds of nozzle angle, and the distribution characteristics of flow field and such hydrodynamic parameters as pressure and velocity of the nozzle with three kinds of angle at various jet velocity were compared. The study results showed： while the nozzle angle was 45° , the pressure and velocity contours in agitation zone was reasonable, and the negative pressure between adjacent nozzles and between impeller blades was low, which was conducive to suction of air; due to the existence of vortex, mineralization effects improved, while slime caused endless cycling, so further test should be conducted.
出处
《矿山机械》
2016年第10期51-55,共5页
Mining & Processing Equipment
基金
国家自然科学基金项目(51374015)
