Abstract
An experiment was conducted obtain systematic data of particle holdup in a liquid-solid circulating fluidized bed. In the experiment, 2 kinds of riser tube having a diameter of 24 mm and 36 mm were used. Tested particles were of glass and ceramics, and their diameter range was from 2.10 to 4.95 mm. Water at ambient conditions was used as the fluidizing fluid. Particle holdup in the riser tube was measured using the shut-off method. Based on the experimental data, correlations for the drag coefficient and the particle holdup were derived, the latter could reproduce almost all experimental data with an accuracy of 15%. The effect of wall was not recognized within the experimental range, i.e., the particle to the riser tube diameter ratio of less than 0.2. The independent parameters for the flow characteristics were identified.
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