摘要：
为了解决双进双出钢球磨煤机初装球量过大、补装球制度不合理、钢球损耗大,磨煤电耗高的问题,本文在构建钢球在磨煤机筒内的运动模型和综合钢球冲击、磨剥、摩擦以及疲劳影响的钢球磨损模型的基础上,提出了一种确定双进双出钢球磨煤机初装球量和精准补装钢球周期、装球量和级配的新方法.该新方法以某机组E磨煤机为例,经过少球改造后,根据钢球装载量变化引起的功率、最大出力和煤粉细度变化精准确定了补装球周期及数量,利用磨损后钢球尺寸分布变化推导出钢球磨损稳态特性矩阵,求出各级钢球合理的补充量.与采用传统初装球和补装球方法的B磨煤机运行数据的对比结果表明,采用新方法的E磨煤机钢球损耗和磨煤电耗总费用为426.57元/h,B磨煤机钢球损耗和磨煤电耗总费用为706.82元/h,新方法经济效益显著.%On double-inlet and double-outlet ball mills, the initial balls loading is over capacity, the scheme for supplement balls is unreasonable, the abrasion of steel balls is excess, and the electricity consumption for grinding is huge. To solve these problems, a new method that can accurately calculate the initial balls loading, the period and quantity of adding balls for the double-inlet and double-outlet ball mill is presented, on the basis of building up the models for steal balls' motion in the barrel and abrasion synthesizing with impact, grinding, friction and impact fatigue. Taking coal mill E in a power plant as the example, this method was applied to ascertain the period and quantity of adding balls after less ball transformation, in consideration of variation of power, maximum capacity and fineness of coal powder caused by variation of steel ball loading. The steal ball abrasion steady characteristic matrix was deduced by variation of distribution of steel balls size, and it was employed to calculate the compensatory quantity of each grade of balls. Compared with the abrasion of steel balls and consumption of power of coal mill B which uses the conventional initial loading balls and adding balls method (706.82 yuan/h), that of the coal mill E applying the new method is 426.57 yuan/h, indicating the new method has remarkable economic benefit.
