Minimum Fluidization Velocity in Gas-Liquid-Solid Minifluidized Beds
Minimum Fluidization Velocity in Gas-Liquid-Solid Minifluidized Beds
复制标题
气-液-固小型流化床中的最小流化速度
DOI：
10.1002/aic.15196
复制
发表时间：
2016
期刊：
影响因子：
3.7
通讯作者：
Li Xiangnan
中科院分区：
文献类型：
--
作者：
Li Yanjun;Liu Mingyan;Li Xiangnan
通过对气液固微型流化床床层压降的分析和直观观察，对气液固微型流化床的初始流化特性进行了实验研究。结果表明，ULmfin 3-5 mm MFB不能确定，由于广泛的压降波动所造成的复杂的气泡行为。对于8-10 mm的流化床，在低表观气速下，ULmf可由压降和Hurst指数两方面的数据分析确定。但在较高的表观气速下，由于流化床的流型转变点消失，床层处于半流化状态，不能获得ULmf。由于气液混合物性质和床壁的影响，气泡生长行为复杂，对固体颗粒的流化起着重要作用，并导致ULmf的降低。提出了一种经验相关性来预测ULmfin MFB。© 2016美国化学工程师学会AIChE J，62：1940-1957，2016
The initial fluidization characteristics of gas‐liquid‐solid minifluidized beds (MFBs) were experimentally investigated based on the analyses of bed pressure drop and visual observations. The results show that ULmfin 3–5 mm MFBs can not be determined due to the extensive pressure drop fluctuations resulting from complex bubble behavior. For 8–10 mm MFBs, ULmfcan be confirmed from both datum analyses of pressure drop and Hurst exponent at low superficial gas velocity. But at high superficial gas velocity, ULmfwas not obtained because the turning point at which the flow regime changes from the packed bed to the fluidized bed disappeared, and the bed was in a half fluidization state. Complex bubble growth behavior resulting from the effect of properties of gas‐liquid mixture and bed walls plays an important role in the fluidization of solid particles and leads to the reduction of ULmf. An empirical correlation was suggested to predict ULmfin MFBs. © 2016 American Institute of Chemical EngineersAIChE J, 62: 1940–1957, 2016