Bubble flow in pressurized gas/solid fluidized beds

ABSTRACT This contribution presents measurements of bubble behaviour for A, B and D powder of Geldart classification in a semi-industrial scale pressurized fluidized bed. Using capacitance probes local measurements on bubble flow were taken at static pressures of 0.2, 1.0 and 2.5 M Pa. In a small “two-dimensional” transparent equipment, quartz sand with mean particle diameter of 157 µm was fluidized with Frigen® R 115. In addition, pressure fluctuations in the bulk of the fluidized bed with inner diameter of 0.4 m have been studied experimentally.