FLUIDIZED BED

Solid flow through the loop seal of a circulating fluidized bed (CFB) was studied by investigating the effect of the horizontal passage length on solid flow through the loop seal. As horizontal passage length increased it was found that the minimum aeration required also increased. As well the maximum obtainable solid flux decreased with increasing passage length due to the increased resistance in the longer passage. The increased resistance to solid flow through the passage was also seen in the increasing pressure drop per unit length across the passage, as the passage length increased. The division of air flow through the loop seal was also investigated in order to determine how the solids were driven through the loop seal. At high solid flow rates all of the supply chamber aeration flowed into the horizontal passage along with an amount of air entrained by the solids falling down the standpipe