The effects of internals and gas distributors on the local dynamics of the bubbles in the conventional gas–solid fluidized bed were studied. Mesh-type internals with different opening areas (50%, 70% and 90%) and different arrangements (two-layer and four-layer); and a sintered plate with a smaller pore size (1 μm) and a perforated plate with a larger pore size as distributors were investigated. Differential pressure drops and local solids holdups were measured under various superficial gas velocities to compare the performances of the different types of internals and distributors. The instantaneous solids holdup signals from the optical fibre probe were used to further examine the local bubble dynamics in detail. Smaller bubbles were found, with the installation of internals or using the sintered plate, resulting in lower pressure drops and a higher bed expansion. Internals with reduced opening area or distributor with smaller pore size further leads to a higher changeover rate between the bubbles and dense phase, both axially and radially, and hence a better gas–solid contacting and an earlier transition to the turbulent flow regime of the bed.

研究了内部和气体分配器对传统气固流化床中气泡局部动力学的影响。具有不同开口面积（50％，70％和90％）和不同布置（两层和四层）的网状内件；以及孔径较小的烧结板（1 （μm）和孔径较大的多孔板作为分配器。在各种表观气体速度下测量压差和局部固形物含量，以比较不同类型的内件和分配器的性能。来自光纤探头的瞬时固体滞留信号被用于进一步详细检查局部气泡动力学。使用内部组件或使用烧结板发现较小的气泡，从而导致较低的压降和较高的床膨胀率。具有减小的开口面积的内部构件或具有较小孔径的分配器进一步导致气泡和致密相之间轴向和径向的转换率更高，因此更好的气固接触和更早地过渡到床的紊流状态。