水泥厂新型高效分级设备研究.docVIP

编号 本科生毕业论文 水泥厂新型高效分级设备的研究 Research of New and High Efficient Grading Equipments for Cement Plant 学 生 姓 名 专 业 无机非金属材料工程 学 号 指 导 教 师 学 院 材料科学与工程 2010 年 6 月 摘 要 分级机是粉体制备行业中非常重要的设备之一，通过分级除去粉体原料或半成品中过大或过小的颗粒，控制产品的粒度在一定的范围之内，从而保证粉体颗粒粒度分布满足产品的质量要求。第三代动态空气分级设备，也就是涡流空气分级机，具有分级精度高、分级性能好的特点。分级机的关键技术是:分散和分级。本文对物料分散性和涡流空气分级机内流场特性二方面内容进行了实验研究与分析。 在物料进入涡流空气分级机前增加了机械打散装置，通过机械力打散使物料悬浮分散于气流中并输送到分级机内。以重质碳酸钙和水泥生料为原料进行了分级实验。结果表明，在高风速范围内增加打散装置对分级粒径的影响不大，但可以明显提高分级精度;增加打散装置后水泥生料的分级精度明显高于重质碳酸钙的分级精度，由于颗粒粒度分布和粉体物理特性的差异，水泥生料易团聚，表明此打散装置更适合用于易团聚物料的分级。 关键词:涡流空气分级机，机械打散，激光多普勒测速仪，流场特性， ABSTRACT In the powder industry classification is one of the most important basic operation, which makes the particle size suit to the demand of powder product.As the third-generation dynamic air classification equipment, turbo air classifier has high classification precision and good classification performance.As we know, the key technology of turbo air classifier is as follows: dispersion nd separation. In this study, mechanical dispersion of raw materials and the low field characteristics in the turbo air classifier were investigated and nalyzed. The mechanical pre-dispersion equipment was installed in a turbo air classifier before the raw materials were classified. Raw materials were suspended to disperse and conveyed into classifier by pressured airflow. The classification experiments of ground calcium carbonate and cement raw meal were made and the effect of mechanical pre-dispersion on classification performance was investigated under different operating parameters. The results show that on the high air flow rate condition the effect of different feeding manner on the classified particle cut size is unapparent and employingthe dispersing equipment classification precision is improved enormously; the result that classification precision of cement raw meal is higher than that of ground calcium carbonate demonstrates that the dispersion equipment was suit to raw materials