自动清洗式流态化换热器传热强化的运行参数优化研究  

Optimization of operation parameter of heat transfer enhancement in self-cleaning fludization heat exchangers

作　　者：李桂芳[1] 肖福兵[1] 俞秀民[1] 

机构地区：[1]湖南工业大学清洗研究所

出　　处：《清洗世界》2006年第4期1-4,共4页Cleaning World

基　　金：国家九五重点推广计划项目(编号96050403A);湖南省教育厅资助项目(编号03C596)

摘　　要：液-固流态化传热强化机理还不完全清楚，已有文献对流态化粒子的粒度与传热系数的影响关系有较大分歧。从传热强化角度对水-沙流态化自动清洗的运行参数进行优化试验研究，得到的结果是：沙子粒度不是愈细愈好，而是Dp2mm（8目）左右为好；粒子体积分数以2．4％比较好；流速在0．2～0．28m／s（Re=6000-9000）的范围较好。虽然浓度低，但是在优化条件下的流灰化传热强化幅度几乎可以达到一倍左右，并且阻力又很低。The mechanism of heat transfer enhancement of liquid - solid fluidization is met clear so far. There is many different points about the relationship between the particles size and heat transfer coefficient in present literatures. From the point of heat transfer enhancement, the optimization experimentalstudy of parameter is made. Heat transfer coefficient will not always increase as the particle size decreased. The size of Dp 8 mm is the best. The optimal volume fraction of particles is 2.4%. The optimal range of flowing velocity is from 0.2 m/s to 0.28 m/s（ Re = 6 000～9 000）. The heat transfer enhancement is as great as nearly 100%and the total resistance is low under above conditions.

关 键 词：流态化 传热强化 粒子浓度 粒子粒度 流速最佳 

分 类 号：TQ051.62[化学工程] TK124[动力工程及工程热物理—工程热物理]