| 摘要 |
A circulating fluidized bed (CFB) system, and a method of operating, provide for improved heat recovery. One or more return ducts (16) from a particle separator (14) attached to the combustion chamber (12) have heat transfer sections (24) with heat transfer surfaces (30). Low velocity fluidizing gas is introduced into a bed (28) having distinct heat transfer (24) and particle transport (44) sections, in order to fluidize the bed, and transporting gas is separately introduced (48) to transport a desired rate of particles from the bed to the combustion chamber through a solid particle inlet (32) which is situated below the top surface of the bed of particles. Barriers are established which prevent the transporting gas from interfering with heat transfer in the heat transfer section.
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