Experimental Investigation into Fluid Behaviors of Nano-TiO_2 in an Annular Fluidized Bed

The pressure drop of bed and bed expansion curve and the minimum fluidization velocity were obtained by experimental measurements in an annular fluidized bed.The experimental results show that the bed pressure drop and ratio of bed expansion increase with increasing of gas velocity in fluidization state of gas increasing velocity.When gas velocity exceeds fixed value,nano-TiO2 particles are completely in fluidization;pressure fluctuation and ratio of bed expansion are smooth and steady.The minimum fluidization velocity increases with increasing of nano-TiO2 mass.