击打器在末精煤脱水系统的应用

Application of batter in dewatering system of final clean coal

针对隆泰选煤厂末精煤预脱水弧形筛脱水效果差的问题,基于选煤厂末精煤回收工艺流程,分析弧形筛窜料原因,并对其进行改造。结果表明,弧形筛的入料浓度过低导致弧形筛窜料严重,影响脱泥脱水效果;弧形筛入料以一定初速度沿弧形筛切线方向给入弧形筛,速度过快时会造成筛面窜料;振动电机功率偏小,造成振动量不够,严重影响脱水效果。通过调整弧形筛振动电机的振幅、定期清理弧形筛筛缝、在弧形筛入料口增加挡皮、增设气动击打器等措施对弧形筛进行改造。改造后彻底解决了弧形筛窜料问题,末精煤水分由原来的平均23.5%降至10.8%,使用效果明显。

In view of the poor dehydration effect of the end clean coal pre-dewatering arc screen in Longtai coal preparation plant,based on the recovery process of the final clean coal in the coal preparation plant,the causes of the arc screen string were analyzed and the modification was carried out.The results show that low feed concentration of arc screen leads to serious channeling,which affects the desliming and dehydration effect.Arc screen is fed along the tangent direction at a certain initial velocity,and if the speed is too fast,it causes channeling material on the screen surface.Vibration motor power is small,and has insufficient vibration,which seriously affects the dehydration effect.By adjusting the amplitude of the vibrating motor of arc screen,cleaning the screen seam of arc screen regularly,increasing the stopper at feed inlet ofarc screen and adding the pneumatic batter,channeling of arc screen is sloved,and water of fine cleaned coal changes from^23. 5% to 10. 8%.