物料与窑壁间歇接触对回转窑传热过程的强化效应  

Enhancement Effect Towards Heat Transfer of Rotary Kiln by Intermittent Contact Between Material and Kiln Wall

作　　者：雷先明[1] 肖友刚[2] 

机构地区：[1]邵阳学院机械与能源工程系,湖南邵阳422004 [2]中南大学轨道交通安全重点实验室,长沙410075

出　　处：《中国工程科学》2006年第8期39-44,共6页Strategic Study of CAE

基　　金：中国博士后科学基金资助项目(2005038227);湖南省自然科学基金资助项目(04JJ3050)

摘　　要：根据回转窑内物料颗粒的运动特点,推导了颗粒团在贴壁运动过程中的非稳态导热系数及界面处的接触传热系数,进而得出了物料与封盖窑壁间的换热系数;结合已有研究成果,建立了回转窑的传热数学模型。计算表明,未考虑物料与窑壁间歇接触对回转窑传热过程的强化效应时,物料温度偏低;温度越高,强化效应对物料温度的影响越大;考虑物料与窑壁间歇接触对回转窑传热过程的强化效应,有利于提高回转窑煅烧熟料的质量和热效率。In rotary kiln cluster moves against kiln wall. According to this feature, transient thermal conductivity of cluster and contact heat transfer coefficient of boundary between cluster and kiln wall are deduced, then heat transfer coefficient between material and covered wall is obtained. Combined with other research harvests, the heat transfer model of rotary kiln is established. The results can be shown as follows： the temperature of material is lower when the enhancement effect towards heat transfer of rotary kiln by intermittent contact between material and kiln wall has been ignored; the higher the temperature, the greater the influence of enhancement effect on material temperature; it is beneficial to improving the quality of clinker and thermal efficiency of rotary kiln when the enhancement effect has been considered.

关 键 词：物料 封盖 传热过程 强化效应 

分 类 号：TK124[动力工程及工程热物理—工程热物理]