RESIDENCE TIME DISTRIBUTION OF SOLIDS FLU IDIZED BY GAS WITHIN VOIDS OF BED PACKED OF SPHERES IN CYLINDRICAL APPARATUS

There was determined experimentally the residence time distribution of solids forming fluidized phase and moving in a, co-current flow with fluidizing gas throughout voids of bed of spheres randomly packed with in a column. The column was of 0.1 m inside diameter; the spheres, 0.0 1 and 0.015 m in diameter, were packed to the height of 1 m. The fluid ized phase was generated of sands by air stream at ambient conditions and with interstitial velocities corresponding to the fluidization num bers of 6-12 in individual experiments; the sands fraction was collect ed between the sieves with the meshes of 0.25.10(-3) and 0.315.10(-3) m. The results of experiments show that the residence time distributio n of the solids forming the fluidized phase in the open system investi gated is similar-to that characteristic for the flow tank system with ideal mixing in the flowing medium. No effects of the fluidization num ber as well as of the diameter of the spheres forming the bed have bee n observed.