金属铁颗粒高温流化特性  

Fluidization Characteristic of Iron Powder at High Temperatures

作　　者：钟怡玮[1] 王志[1] 郭占成[2] 唐清[1] 

机构地区：[1]中国科学院过程工程研究所,北京100190 [2]北京科技大学,北京100083

出　　处：《化学反应工程与工艺》2014年第1期22-27,共6页Chemical Reaction Engineering and Technology

基　　金：国家自然科学重点基金(50834007)

摘　　要：利用高温可视流化床研究了金属铁颗粒的高温流化特性和粘结失流化行为。探讨了流化气速,颗粒尺寸对粘结温度的影响。结果表明,气速越高,粒径越大,粘结失流化越难发生。不同温度下颗粒初始流化速率的测定结果表明,初始流化速率在高温下随温度升高而增大。热机械分析表明,随着温度的升高,颗粒表面粘度降低,颗粒间粘性力增大。结合粘性流理论,探讨了金属铁颗粒流化特性转变和粘结失流化的机理。The fluidization characteristic and defluidization behavior of iron powder was investigated at higher temperature in a visual fluidized bed reactor. Influences of fluidizing gas velocity and particle size on defluidization temperature was studied. Results showed that the defluidization temperature increased with increasing fluidizing gas velocity and particle size. The minimum fluidization velocity at different temperatures was measured. Results showed that the minimum fluidization velocity increased with increasing temperature. The thermo-mechanical analysis indicated that the surface viscosity decreased with temperature, suggesting an increase of adhesion force between particles. Based on viscous flow theory, the mechanism of fluidization transition and defluidization was discussed.

关 键 词：金属铁颗粒 粘结失流化 初始流化速率 可视流化床 颗粒粘附 

分 类 号：TQ021.1[化学工程]