回转窑窑壁非稳态传热模型及窑皮厚度优化  

Transient heat transfer model of kiln wall and kiln crust thickness optimization

作　　者：肖友刚[1] 刘义伦[2] 马爱纯[3] 

机构地区：[1]中南大学轨道交通安全教育部重点实验室,长沙410075 [2]中南大学机电工程学院,长沙410083 [3]中南大学能源与动力工程学院,长沙410083

出　　处：《中国有色金属学报》2006年第6期1115-1119,共5页The Chinese Journal of Nonferrous Metals

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：烟气、料床、窑壁是回转窑传热过程的三要素，在确定这三要素之间传热量的基础上，建立了回转窑窑壁非稳态传热数学模型。对中铝河南分公司2号窑窑壁的非稳态传热过程进行了数值计算。结果表明：窑体旋转一周，烧成带窑壁内表面温度将在1232-1334℃变化，这易导致窑壁热疲劳破坏；窑皮越厚，窑壁的径向温度梯度越小，热应力越低；将烧成带窑皮厚度控制在252mm，可使烧成带窑壁外表面温度维持在200℃。Gas, material bed, kiln wall are the three main factors effecting kiln heat transfer process. On the basis of confirming the heat transfer equation among the three factors, the transient heat transfer model of kiln wall is set up. The numerical calculation of transient heat transfer process of kiln wall of No. 2 rotary kiln was carried out in He＇nan branch of China aluminum corporation. The results show the inner kiln wall temperature changes between 1 232 ℃ and 1 334 ℃ in sintering zone, which will make lining break down easily. The thicker the kiln crust, the smaller the radial temperature grade of kiln wall, the lower the heat stress, the outer kiln wall temperature keeps at 200 ℃ when kiln crust thickness is controlled at 252 mm in sintering zone.

关 键 词：回转窑 窑壁 窑皮 优化 传热 

分 类 号：TK124[动力工程及工程热物理—工程热物理]