摘要
研究了流化床反应器内发生气固反应时的传热机理 ,认为气固间的传热面积包括两部分 ,即气泡内所含颗粒的表面积与气泡和泡晕间的有效传热面积 ,据此首次导出了气固传热面积模型A=u0 - umf2 2 .2 6 db0 .5- umf[4.5 umfρg Cpgdb +5 .85 (λgρg Cpg) 0 .5g0 .2 5db1.2 5]Lm Sα将该模型应用于半间歇的裂化催化剂烧炭再生过程 ,与实验数据的比较表明 。
According to the detailed analysis of the transient heat transfer mechanism between gas and solid in fluidized bed reactors, it was considered that the area of heat transfer includes two parts: the surface area of solid particles entering the gas bubbles and the heat transfer area between bubble halo and emulsion phase. A area model has been developed as following: A = uo-umf/22.26db0.5-um f LmS/α[4.5 μmfρgCpg/db + 5.85 (λgρgCpg)0.5 g0.25/db1.25] which is applied to the burning-off of carbon deposited in cracking catalyst pellets in a semi-batch fluidized bed reactor. Comparisons of model with experimental data were given. The result showed that the present models can give a good predication of experimental results.
出处
《化学反应工程与工艺》
EI
CAS
CSCD
北大核心
2001年第1期16-20,共5页
Chemical Reaction Engineering and Technology
