(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)
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1 232～1 334 ℃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252 mm， 可使烧成带窑壁外表面温度维持在200 ℃。
关键字: 回转窑； 窑壁； 窑皮； 优化； 传热
kiln crust thickness optimization
（1. Key Laboratory of Track Traffic Safety of Ministry of Education,
Central South University, Changsha 410075, China;
2. School of Mechanical and Electrical Engineering,
Central South University, Changsha 410083, China;
3. School of Energy and Power Engineering,
Central South University, Changsha 410083, China）
Abstract: 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.
Key words: rotary kiln; kiln wall; kiln crust; optimization; heat transfer
