( 1. 中南大学 能源与动力工程学院， 长沙 410083;
2. 中国铝业股份有限公司 郑州轻金属研究院， 郑州 450041)
摘 要: 以d4.5m×90m熟料窑的喷射干燥段为研究对象， 建立了三维传热、 传质数学模型。 应用数值方法， 研究了不同窑尾压力和料浆粒径时， 窑内温度分布和水蒸气的浓度分布， 并对操作参数和工艺参数进行了优化。 结果表明： 窑尾负压和生料浆的平均粒径对窑内温度分布和水蒸汽浓度分布有较大影响； 需要提高窑尾温度和窑尾烘干能力时可提高负压， 反之则减小负压； 减小料浆粒径， 有利于降低窑尾烟气温度， 加快物料的升温过程； 对直径为4.5m左右的大型回转窑， 窑尾负压可根据窑况在-200~-300Pa之间调节， 生料浆的平均粒径不宜大于0.1mm。
关键字: 氧化铝熟料窑； 喷射干燥； 温度分布； 仿真优化
（ 1. School of Energy and Power Engineering,
Central South University, Changsha 410083, China;
2. Institute of Light Metal, China Aluminum Corp,
Zhengzhou 450041, China）
Abstract: A3-D numerical model of spray drier zone in a d4.5m×90m alumina rotary kiln was established. With the spray drier model, the effects of particle size of raw slurry and pressure of kiln end on temperature and water vapor concentration profile in kiln are studied numerically and some parameters are optimized. The results show that the pressure of kiln end and particle diameter of raw slurry affect the performance of spray drier zone obviously. Drying capability can be enhanced by increasing negative pressure of kiln end and decreasing mean particle diameter of raw slurry. According to the work conditions, the pressure of kiln end is supposed to be regulated between -200～-300Pa and the mean particle diameter of raw slurry should be within 0.1mm for large kiln.
Key words: alumina rotary kiln; spray drier; temperature profile; numerical simulation
