【摘要】 首先对喷动床流动特征参数关联式进行了扼要介绍,继而着重总结了近年来喷动床内气固流动模型(喷射区气固稀相流模式、环隙区气体渗流模式以及固体颗粒流模式)、以及喷动床放大规律等基础理论研究的进展。最后,提出了未来喷动床流动模型工作的突破点和相应思路。更多还原

【Abstract】 Spouted bed is an attracting gassolid contactor (dryer, catalytic or noncatalytic pyroreactors) for handling the coarse Geldart D particles, which superimposes the features of dilutephase fluidized beds and densephase moving beds. A brief description of hydrodynamic parameters of spouted beds is firstly introduced. The models on flow patterns in spouted bed, including gas model in annulus on basis of a force balance, solid flow model in annulus on basis of granular flow kinetics, and the mass and momentum balance of gassolid in spout on basis of twofluid model, were reviewed in detail. The solutions of each submodel as well as their coupling were also discussed. In addition, the scaleup studies of spouted beds were discussed. Finally, the further research ideas are proposed as conclusions, that’s, both the theory of turbulence and theory of quasistatic flow of granular materials should be paid more attention in the futural work of spouted bed modeling.更多还原