Results of experimental measurement of solids mass flux profiles in a high density circulating fluidized bed riser over a wide operating condition are described.The existence of three solids flux radial profile regime...Results of experimental measurement of solids mass flux profiles in a high density circulating fluidized bed riser over a wide operating condition are described.The existence of three solids flux radial profile regimes:core-annular,parabolic and U-shaped is found.A model for all the three regimes is proposed and correlations of model parameters are obtained.Comparison of predicted solids flux profiles with experimental data is very promising.The correlations for the boundaries of the three regimes and the radius of core for core-annular regime are obtained.展开更多
采用离散单元法(Discrete element method, DEM)分别对漏斗形移动床内颗粒粒径、底部开口宽度和卸料口坡度对颗粒质量流率的影响规律进行了数值模拟.研究结果表明:颗粒粒径、底部开口宽度和卸料口坡度的大小均对颗粒流率有着较大的影响...采用离散单元法(Discrete element method, DEM)分别对漏斗形移动床内颗粒粒径、底部开口宽度和卸料口坡度对颗粒质量流率的影响规律进行了数值模拟.研究结果表明:颗粒粒径、底部开口宽度和卸料口坡度的大小均对颗粒流率有着较大的影响。颗粒质量流率与颗粒粒径、卸料口坡度、开口宽度均呈现正相关的依赖关系,尤其随着卸料口坡度的增长呈指数形式增长.并且,颗粒质量流率与卸料口坡度满足依赖关系—平底形移动床Beverloo方形出口修正公式.展开更多
文摘Results of experimental measurement of solids mass flux profiles in a high density circulating fluidized bed riser over a wide operating condition are described.The existence of three solids flux radial profile regimes:core-annular,parabolic and U-shaped is found.A model for all the three regimes is proposed and correlations of model parameters are obtained.Comparison of predicted solids flux profiles with experimental data is very promising.The correlations for the boundaries of the three regimes and the radius of core for core-annular regime are obtained.
文摘采用离散单元法(Discrete element method, DEM)分别对漏斗形移动床内颗粒粒径、底部开口宽度和卸料口坡度对颗粒质量流率的影响规律进行了数值模拟.研究结果表明:颗粒粒径、底部开口宽度和卸料口坡度的大小均对颗粒流率有着较大的影响。颗粒质量流率与颗粒粒径、卸料口坡度、开口宽度均呈现正相关的依赖关系,尤其随着卸料口坡度的增长呈指数形式增长.并且,颗粒质量流率与卸料口坡度满足依赖关系—平底形移动床Beverloo方形出口修正公式.