连续进料多腔室流化床停留时间分布数值模拟OA

To reveal the hydrodynamic characteristics and particle residence time distribution(RTD)patterns of a multi-chamber fluidized bed reactor,and to optimize its structure and operational parameters,a numerical model of a continuously fed bubbling fluidized bed was developed using the Eulerian-Eulerian two-fluid model with species transport equations.Comparative simulations were carried out for baffle-free fluidized beds and multi-chamber beds under varying baffle opening heights,outlet tube heights,immersed tube bundle configurations,and solid feed rates.The gas-solid flow patterns,RTD,and back-mixing behavior were systematically evaluated.The results show that the multi-chamber baffled bed effectively suppresses bubble growth and promotes uniform hydrodynamics across chambers.The baffle structure makes the RTD approach plug flow,increases the average particle residence time by 14.5％,and reduces the variance from 0.79 to 0.58,with an orifice height of 20 mm being optimal.Reducing bed height shortened residence time by 45.2％but had limited mixing benefits,while adding immersed tubes further reduced variance by 15.1％.Decreasing the solid feed rate from 80 g/s to 60 g/s increased average residence time but intensified back-mixing.This study offers theoretical and practical insights for the design and scale-up of high-performance calcium looping reactors for thermochemical energy storage.