氧化铝回转窑内外风比例的数值模拟及优化  

Numerical Simulation and Optimization of Ratios between Internal and External Air Volume of Alumina Rotary Kiln

作　　者：易正明[1] 杜炳旭 曾壮壮 肖慧[1] 陶倩[1] 

机构地区：[1]武汉科技大学钢铁冶金及资源利用教育部重点实验室,武汉430081

出　　处：《有色金属（冶炼部分）》2016年第2期28-32,共5页Nonferrous Metals（Extractive Metallurgy)

基　　金：国家大学生创新计划项目(201310488007);湖北省教育厅科学技术研究项目(B2014088)

摘　　要：应用FLUENT软件对Φ4.5m×90m的氧化铝回转窑内的煤粉燃烧、流动、传热等过程进行数值模拟。通过改变内外风比例,得到相应条件下的温度与速度分布,并进行比较和分析。结果表明,内外风比例为0.6和0.8时,温度分布均匀且基本一致,火焰有效区间长度达到8.6 m以上,最高温度约2 030K,满足熟料烧成要求,实际生产中可在0.6~0.8附近调节内外风比例;轴向速度随外风量的减小而减小,径向速度随内外风速差的减小而减小。Pulverized coal combustion, flow, and heat transfer in φ4.5 m×90 m alumina rotary kiln were simulated with FLUENT soft. Temperature and velocity distribution were obtained under different ratios between internal and external air volume. The results show that with ratio set to 0.6 and 0.8, temperature distribution shows better conformance. The effective length of flame can reach up to 8.6 m or above, and temperature can reach as high as 2 030 K, which accord with the requirements of clinker burning. The ratio can be adjusted within 0.6 ~ 0.8 in practice production. Axial velocity will drop with decrease of external air volume, and radial velocity will go down with the decrease of speed difference between internal and external air volume.

关 键 词：氧化铝回转窑 内外风比例 温度分布 轴向速度 

分 类 号：TF821[冶金工程—有色金属冶金] TF806.12