滚筒式污泥干燥器特性仿真及结构优化  

Characteristic simulation and structure optimization of drum-type sludge dryer

作　　者：朱桂华[1] 徐洪威[1] 王建业 柳颖娇 彭南辉 ZHU Guihua;XU Hongwei;WANG Jianye;LIU Yingjiao;PENG Nanhui(School of Mechanical and Electrical Engineering,Central South University,Changsha,Hunan 410083,China)

机构地区：[1]中南大学机电工程学院,湖南长沙410083

出　　处：《江苏大学学报（自然科学版）》2018年第5期556-562,共7页Journal of Jiangsu University：Natural Science Edition

基　　金：湖南省科技计划重点项目(2014SK2020)

摘　　要：针对目前用滚筒干燥器进行污泥干化过程中热能利用率低等问题,运用Fluent软件与EDEM软件耦合仿真模拟其干燥过程,研究了在考虑颗粒物料相互碰撞作用以及热气流对物料的牵引作用时,滚筒结构对物料的运动路径及其干化效果的影响.提出虚拟吸热量的概念,描述物料在受热干化时气固两相复杂的热交换过程;通过仿真,分析滚筒内扬料板的分布、入料螺旋的长度对物料在滚筒内运动路径及其干化效果的影响,并进行优化设计.研究结果表明:对于规格一定的滚筒干燥器,其扬料板分布形式是影响污泥滚筒干燥器热效率的重要因素;在改进扬料板分布、入料螺旋长度后,滚筒干燥器热效率提高11.2%.To solve the problem of low thermal efficiency in the process of drying sludge in roller dryer,the drying process was simulated by Fluent software and EDEM softwares.Considering the collision of granular material and the thermal traction to material,the influence of roller structure on motion path and drying efficiency of materials was investigated.The concept of virtual heat absorption was put forward to describe the complex gas-particle two-phase heat exchange process when the material was dried by heating.By simulation,the effects of hopper plate distribution and feed screw length on motion path and drying efficiency of material in the roller were analyzed to conduct design optimization.The results demonstrate that for the roller dryer with a certain specification,the distribution of hopper plates in the roller dryer is important affecting factor on thermal efficiency.After improving the distribution of hopper plate and the length of feed screw,the thermal efficiency of roller dryer can be increased by 11.2%.

关 键 词：滚筒干燥器 耦合仿真 气固两相 热交换 结构设计 

分 类 号：TQ051[化学工程]