Experimental study on hydrodynamics of multistage fluidized bed column with a draft tube

The applications of a multistage fluidized bed is limited by the adjustability of operation and stability of operation and so on. A small-size multistage fluidized bed with draft tube was employed to obtain hydrodynamic data in a range in operation condition. The multistage fluidized bed with draft tube exhibits properties different from a conventional one, such as lower stable pressure drop, higher disposal capacity and adjustable range and especially improving the fluidizability of the material. Besides, a multistage fluidized bed with draft tube possesses the characteristic of a spout-fluid bed and the function of flooding material when achieving a higher material level, thus further increasing the diathermanous efficiency and the disposal capacity of column. Finally, based on hydrodynamics analysis, the pressure drop characteristics with solid flux and gas velocity were summarized and simulated, the simulated results were agreed with the experimental data.