沥青搅拌设备烘干筒料帘密度建模及仿真  

Modeling and simulation of material curtain density for asphalt mixing plant rotary dryer

作　　者：张晨光[1] 焦生杰[1] 谢立扬[1] 顾海荣[1] 

机构地区：[1]长安大学公路养护装备国家工程实验室,陕西西安710061

出　　处：《华中科技大学学报（自然科学版）》2017年第5期55-60,共6页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51408046)

摘　　要：为提高沥青搅拌设备烘干筒的传热效果,掌握烘干筒叶片对石料抛撒特性的影响,以4 000型烘干筒为研究对象,对筒内石料的运动轨迹进行了运动学建模及离散元仿真.采用几何法分象限建立了叶片持料量模型,通过石料颗粒的运动学分析,建立了料帘密度的数学模型.研究了不同叶片型式和圆周数量工况下的料帘密度变化趋势,提出了料帘密度合理的选值区间及叶片的设计方法,并利用EDEM离散元软件对研究结果进行了仿真验证.结果表明:适宜的烘干筒料帘密度范围为30~35g/m3,4 000型烘干筒若采用三段式叶片,则圆周数量可以选择为18片或20片;若采用两段式叶片,则适宜的圆周数量为20片.研究结论为烘干筒结构参数优化提供了科学依据.To improve the heat transfer efficiency of rotary dryer for the asphalt mixing plant and study how the rotary dryer flights influence the material spreading, 4000 series rotary dryer was tak- ing as the research object and the kinematic modeling and discrete element simulation of the material trajectory in drum were carried out. By using the geometric method, the holding capacity model of flights in the sub quadrant was established. Through the kinematic analysis of stone particles, the mathematical model of material curtain density was also established. The changing trend of material curtain density under different working condition of flights type and circular quantity was studied. The reasonable selected range of material curtain density and the flights design method were put for- ward. The result was verified by the EDEM discrete element software. Results show that the appro- priate range of material curtain density is 30~35 g/m3. If the 4000 series rotary dryer use the three stage type flights, the circular quantity can be chosen to be 18 or 20. If the two stage type flights were used, the appropriate circular quantity is 20. The research conclusions provide scientific basis for the structural parameter optimization of rotary dryer.

关 键 词：沥青搅拌设备 烘干筒 叶片 数学建模 EDEM仿真 

分 类 号：U416.52[交通运输工程—道路与铁道工程]