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。
A 3-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 ～ -300 Pa and the mean particle diameter of raw slurry should be within 0.1mm for large kiln.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2004年第1期138-141,共4页
The Chinese Journal of Nonferrous Metals
基金
国家教育部博士点基金奖励项目(20010533009)
关键词
氧化铝
熟料窑
喷射干燥
仿真
优化
温度分布
alumina rotary kiln
spray drier
temperature profile
numerical simulation
