Abstract: Granules are widely used in chemical,energy,food,pharmaceutical,mining and relevant industries. In solid processing systems,electrostatics could be commonly generated,which causes many problems,such as granule clustering,blocking,sparking and even exploding.So far,the functional dependence of electrostatic charge generation on granular size and shape has not been fully understood.In this work,granules made of polyvinyl chloride(PVC)with shapes of triangle or trapezium and mean size 2.0—5.0 mm,were studied.Granular shape factors,such as front-facing angle,length-ratio,area,and sliding orientation,relative humidity affected electrostatics greatly,but independent of how many times of granule sliding.

Key words: granule, electrostatics, granular shape, triangle, trapezium

摘要： 固体颗粒广泛应用于化学化工、能源、食品、制药、采矿等行业。在工业过程中,颗粒与壁面摩擦产生静电对安全生产带来很多问题,如引起颗粒结团、堵塞、火星和爆炸等危害,然而静电产生的机理还有很多未知,如颗粒形体因素影响静电发生的机理尚不清楚。本工作目的是研究颗粒形体因素对因颗粒面摩擦产生静电的影响机理。实验选用颗粒材料为PVC,平均尺寸为2.0～5.0 mm,分别以三角形面和梯形面作为摩擦面,采用直接测量的方法获得单个颗粒产生的静电。实验证明,无论是一次摩擦产生的静电,还是多次摩擦产生的饱和静电,颗粒的形体因素如前冲角、长宽比、面积以及不同的滑行方向和环境湿度都会明显影响静电的产生。

关键词: 颗粒, 静电, 形体, 三角形, 梯形