A FLUIDIZED BED HEAT EXCHANGER FOR A CIRCULATING FLUIDIZED BED BOILER AND A CIRCULATING FLUIDIZED BED BOILER WITH A FLUIDIZED BED HEAT EXCHANGER

摘要

Abstract A heat exchanger (30) and a circulating fluidized bed boiler (10) with a heat exchanger comprising a first (36) and a second (38) fluidized bed heat 5 exchange chamber arranged in connection with a furnace (12) of the circulating fluidized bed boiler, a first inlet channel (18) for introducing hot solids from a particle separator of the external circulation of the circulating fluidized bed boiler (10) into the first heat exchange chamber (36), a second inlet channel (58) for introducing solids to the second heat exchange chamber (38), first discharge 10 means (54, 56) for removing a first portion of the cooled solids from the first heat exchange chamber (36) to the second inlet channel (58) and second discharge means (61) for removing cooled solids form the second heat exchange chamber (38) to the furnace (12), said heat exchanger comprising inlet means (64) for introducing hot solids directly from the internal circulation of 15 the furnace (12) to the second heat exchange chamber (38). The heat exchanger (30) also preferably comprises third discharge means (72, 74, 76) for removing a second portion of the cooled solids from the first heat exchange chamber (36) directly to the furnace.