Increasing gas-solids mass transfer in fluidized beds by application of confined fluidization-A feasibility study

摘要: Fluidized bed applications where the material plays an active role in chemical reactions, e.g. looping combustion, have seen increase interest over past decade. When these processes are to be scaled up industrial or utility scale mass transfer between gas and solids phases can become a limitation for conversion. Confined fluidized beds were conceptualized other purposes 1960's but yet applied recent technologies. Here it is investigated if they prove useful also feasible from perspectives such as pressure drop throughflow. Four spherical packing solids, 6.35-25.4 mm diameter at two different densities, tested. For experiments fluidizing air was humidified water adsorption rate onto silica gel particles acting measured. Olivine sand used further measuring segregation of packing, maximum vertical crossflow solids. It found that increased by factor 1.9-3.8 with compared non-packed reference. With high-density voidage inside 58% higher than conventional bed. Low density favoured its flotsam fluidization velocities yield better mixing Maximum cross-flow significantly low fluidized, stationary packing. Conclusively, prospect using confined improving looks promising both performance practical standpoints.