搅拌釜中自浮颗粒三相体系的混合时间  

Mixing Time in Stirred Tank of Three-phase Gas-Liquid-Floating Particle Systems

作　　者：徐世艾[1] 冯连芳[1] 顾雪萍[1] 王凯[1] 

机构地区：[1]浙江大学聚合反应工程国家重点实验室

出　　处：《高校化学工程学报》2000年第4期328-333,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：教育部骨干教师计划;国家自然科学基金!(29734144);山东省自然科学基金!(Y98B07026)联合资助。

摘　　要：液相混合时间是搅拌过程的重要内容。在釜径３８６ｍｍ的搅拌釜内，采用热电偶温差法考察了搅拌桨型、挡板、气体分布器等结构因素和转速、气量、颗粒分率等操作因素对自浮颗粒三相搅拌混合的液相混合时间的影响。实验发现，轴向流动是决定液相混合时间的最重要因素，下层桨与釜底的距离以０．３Ｄ为宜，ＢＧＢＧ挡板最优，环径为０．８Ｄ的分布环最佳。 对４５ＳＰＵ＋４５ＳＰＤ＋ＤＴ配ＡＡＡＡ或ＡＢＡＢ挡板，大、中气体分布环，得到混合时间关联式为：对４５ＳＰＵ＋４５ＳＰＤ＋ＷＴ配ＡＡＡＡ或ＡＢＡＢ挡板，大、中气体分布环，得到混合时间关联式为：The liquid mixing time is of importance for the agitation process. The effects of impeller types, baffles, gas sparger, rotational speed, gas volumetric flow rate and particle fraction on mixing time were systematically investigated in three-phase gas-liquid-floating particle systems by measuring the temperature difference using thermocouples. It was revealed that axial flow was the most important factor for the liquid mixing time. The optimum space between lowest-impeller and tank bottom was 0.3D, the optimum baffle was BGBG, and the optimum sparger diameter was equaled to 0.8D. The correlation equations of mixing times were obtained. For the combination impellers 45SPU+45SPD+DT, AAAA or ABAB baffle, larger sparger and moderate sparger, the correlation equation of mixing times was expressed as following: For the combination impellers 45SPU+45SPD+WT, AAAA or ABAB baffle, larger sparger and moderate sparger, the correlation equation of mixing times was following:

关 键 词：自浮颗粒 三相体系 混合时间 搅拌釜 

分 类 号：TQ027.39[化学工程] TQ051.72