为提高破煤效率,以黄河大通发电厂内?4.04 m×5.54 m磨煤机为研究对象,探究了不同腔型衬板磨损前后磨介运动的演变过程,以磨介流动状态、碰撞关系、破煤效率、衬板承受冲击能量等进行了衬板改型优化,同时采用调节筒速促进磨损衬板高效破煤的方式,探究了筒速变化带来的介质流动变化规律.结果表明,改进后的衬板型腔使得破煤效率提高了 21.7%,同时延长了衬板使用寿命.采用提高筒速补偿衬板磨损带来的破煤率低下是可行的,最大可使破煤率提升98.6%,也造成衬板法向、切向累计接触能量分别提高144.9%,54.9%,加速磨损衬板的淘汰,两种方式均可为提高煤料利用率和生产效益提供理论指导.
In order to enhance the coal breaking efficiency of coal mills,we took the 4.04×5.54 m coal mill in Huanghe Datong Power Plant,to study the evolution process of the grinding medium movement before and after the wear of different cavity liners.The flow state of the grinding medium,the collision relationship,the coal breaking efficiency,and the impact energy of the liner were modified and optimized.At the same time,the mill barrel speed was adjusted to promote the coal breaking efficiency of the worn liner,and investigate the effect of barrel speed on the law of medium flow.The results show that the coal breaking efficiency of the improved liner cavity is increased by 21.7%,and the service life of the liner is prolonged.It is feasible to increase the barrel speed to compensate the low coal breaking rate caused by the wear of the liner.The maximum coal breaking rate can be increased by 98.6%.And the normal and tangential cumulative contact energy of the liner can be increased by 144.9%and 54.9%,respectively,which accelerates the consumption of worn liners.The study provides theoretical guidance for improving coal utilization and production efficiency.