建立了一种新型的内循环流化床并实现了快速流态化运转，根据轴向和径向颗粒浓度的测定结果，分析了气固环隙流动和圆管流的差异，经实验数据关联，得到了曳力系数比值Ｃ＿ｄ／Ｃ＿（ｄｓ）随浓稀相极限颗粒浓度的变化趋势；实验中还考察了颗粒浓度受操作条件及物性参数的影响结果，并与传统空管快速床进行了比较。 A new type of inner circulating fluidized bed was established and a fast fluidized operation was achieved. According to the measurement results of axial and radial particle concentration, the differences between gas-solid annular flow and tube flow were analyzed. Experimental data , The trend of the drag coefficient ratio C_d / C_ (ds) with the limit concentration of the dilute and lean phase was obtained. In the experiment, the influence of the particle concentration under the operating conditions and physical parameters was also investigated. Compared with the conventional empty tube rapid bed Compare