Solid Flow Patterns and Heat Transfer Characteristics in a Pulsated Fluidized Bed with Flowing Large Bubbles

摘要

Enhanceemnt of bed-to-surface heat transfer and particle mixing rates is still needed in pulsated fluidized bed technology, in which fluidizing gas is regulated periodically for applications in dryign, catalytic reaction and heat exchanging systems. It is believed that mass and heat transfer rates in radial direction of pulsated fluidized bed could be promoted by passing large bubbles through the bed. Measurements of pressure drop and heat transfer coefficient between an immersed heater and the bed along the riser and observation of the fluidization mode with large bubbles were carried out. The results were compared with convetional fluidized beds with continuous gas flow to investigate the hydrodynamic and heat transfer characteristics in pulsated fluidized bed.