Bubble control in gas-fluidized beds with applied electric fields

摘要: Abstract In some gas-fluidized bed applications the presence of bubbles and channeling is undesirable due to gas bypassing. The partial or total dissipation such will contribute improved fluidized performance in applications, as combustion catalytic reactors, where intimate gas—particle contact important. Preliminary studies this laboratory over past two years demonstrate that, size beds, can be controlled intensity by application suitably applied electric fields. fields are shown effective at a gas—solid particulate interface therefore “seek out” any existing within bed. required order kV/cm strength found influential on variety materials including both good conductors (e.g. copper) semi-insulators coal, glass, limestone). Both a.c. d.c. fields, with without electrode—particle contact, discussed geometries: rectangular cylindrical. Data presented for case electrodes placed externally separate experiment, data collected various kinds particles “gravity lifting tests” suggest that larger (and beds) than those here (29 – 390 μm) also so controlled.