高碳铬铁粉冷态喷动流化特性试验研究  

Experimental Research on Cold-state Spouted Fluidized Characteristics of High-carbon Ferrochrome Powders

作　　者：张雪芳[1] 陈津[1] 郝赳赳[1] 郭丽娜[1] 刘金营[2] 张森浩[3] 

机构地区：[1]太原理工大学材料科学与工程学院,太原030024 [2]中国电子科技集团公司第十二研究所,北京100016 [3]太原理工大学现代科技学院,太原030024

出　　处：《太原理工大学学报》2015年第2期153-159,共7页Journal of Taiyuan University of Technology

基　　金：钢铁联合研究基金-国家自然科学基金委员会与上海宝山钢铁集团公司联合资助(51174252)

摘　　要：设计了喷动流化床试验装置,研究了不同物料粒径和物料质量的高碳铬铁粉冷态喷动流化特性,考察了最大床层压降、最小喷动流化速度、床层空隙率与物料特性之间的变化关系。试验结果和分析计算表明,在同样条件下,高碳铬铁粉在喷动流化床中的起始静床层高度大于最大喷动床床层高度时,物料才具有典型的喷动流化特征;物料密度、物料粒径是影响喷动流化形态的主要因素;最大床层压降随物料质量、物料密度的增加而增大,随物料粒径的增加趋于增大;最小喷动流化速度均随物料质量、物料粒径的增加而增大;床层空隙率随喷动流化气体流量的增加而增大,物料质量对粗颗粒物料的床层空隙率影响较大,对细颗粒物料的床层空隙率影响较小。根据高碳铬铁粉的冷态喷动流化特性和形态变化,得出了高碳铬铁粉混合物料的喷动流化床操作相图。Experimental research of the spouted fluidized characteristics has been carried out in a cone-base cylindrical spout-fluid bed with the height of 1000mm,inner diameter of 30 mm and nozzle diameter of 10mm. High-carbon ferrochrome powders with different sizes and masses were used as bed materials. The changing relation of the maximum bed pressure drop, the minimum spout-fluidized velocity and bed voidage with the bed material properties was researched in detail. The result shows that bed materials appear a spout-fluid bed characteristic when the initial static bed height of high-carbon ferrochrome powders is higher than the maximum spouted bed height by theoretical calculations. The particle size and density are the main factors that affect spouted fluidizing quality. The maximum spouting pressure drop progressively increases with static bed height and particle density and tends to increase with particle diameter. The minimum spout-fluidizing velocity grows with static bed height and particle diameter. The velocity bed voidage goes up as the superficial gas velocity increases. The material mass has a more remarkable influence on the bed voidage of coarse particles than the fine particles. In addition, the flow regime map of spouted fluidized bed with mixed high-carbon ferrochrome powder was developed,which is based on spout-fluidizing characteristics and flow patterns transitions.

关 键 词：高碳铬铁粉 喷动流化床 床层压降 喷动流化速度 床层空隙率 

分 类 号：TF641.12[冶金工程—钢铁冶金]