SOLIDS CIRCULATION IN A RECIRCULATING FLUIDIZED-BED UNDER STICKY CONDITIONS

Experiments have been carried out on a semicircular transparent recirc ulating fluidized bed (RCFB) cold model to study the circulation under sticky conditions and to foresee the likely problems of the actual in cinerator operations. It is observed that the circulation rate decreas ed with increase in stickiness. Auxiliary air supplied as downcomer ae ration and/or side push below the draft tube bottom facilitated the so lids movement and increased the circulation rates. Therefore, it is po ssible to operate the unit at higher stickiness with proper auxiliary air supply. The problems encountered during the operation of the RCFB under sticky conditions and the corresponding alterations in the desig n of an incinerator are also discussed.