用于超细粉体分级的涡流空气分级机流场设计及结构优化

项目名称： 用于超细粉体分级的涡流空气分级机流场设计及结构优化

项目编号： No.51204009

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 冶金与矿业学科

项目作者： 于源

作者单位： 北京化工大学

项目金额： 25万元

中文摘要： 涡流空气分级机是建材、矿业、化工、食品、医药等行业粉体制备系统中非常重要的气力分级设备之一。随着科技的发展和能源的日趋紧张，各行业对分级机分级性能的要求越来越高，不仅要求高精度、高效率，而且要求成品的颗粒微细化且分布满足特定需求。为寻求新的方法解决涡流空气分级机分级超细粉体时存在的上述问题，本项目以流体动力学及涡动力学为理论基础，对涡流空气分级机内部进行全局流场诊断，深入分析分级流场与旋涡产生机制、鱼钩效应、分级机内能量损失之间的内在关联，通过数值计算、模拟仿真、实际检测和物料实验验证相结合的方法，对涡流空气分级机三维流场进行设计并据此优化涡流空气分级机结构。应用量纲和谐原理及相似准则，推导涡流空气分级机相似准数方程并建立相似模拟器，对涡流空气分级机结构参数和操作参数进行优化及分级性能指标预报，强化对涡流空气分级机的控制，以期达到高效、高精度和低阻力的分级目的，为实际生产提供理论指导。

中文关键词： 涡流空气分级机；超细粉体；流场设计；计算流体力学；切割粒径

英文摘要： A turbo air classifier is one of the important pneumatic classification equipments in the powder preparation systems, which is widely used in chemicals, building materials, metallurgy, medicine, biotechnology and other fields. With the development of technology and the world energy resource drying up, the requirement on comprehensive classification performance of a turbo air classifier becomes higher and higher. In addition to high precision and efficiency, particle fineness, particle size distribution and fine powder yield must meet the special requirement of customers. To search a new approach of settling these bottleneck problems in ultrafine powder classification using turbo air classifier, the flow field of turbo air classifier is diagnosed overall based upon fluid dynamics and vortex dynamics. The influences of classification flow field on vortex creating mechanism, fish-hook effect and energy loss of classifier are researched based on numerical calculation and 3-Dimensional simulation in this project. The conclusions of numerical calculation and simulation are verified via actual detections and material experiments.Then the structure of turbo air classifier is optimized according to the designed flow field. In addition, the dimensionless equation that is able to describe classifying process of turbo air c

英文关键词： Turbo Air Classifier；Ultrafine Powder；Flow Field Design；CFD；Cut Size