Fluidized bed unit including a cooling device for bed material
AssigneeFoster Wheeler Energy Corporation
InventorsRobert D. Stewart, Robert L. Gamble
Life of this patent
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Abstract
A fluidized bed combustion or gasification unit in which a grate is disposed in a housing to divide the housing into an upper chamber and a lower chamber. A bed of particulate material including burning fuel is supported by the grate and extends in the upper chamber. The lower chamber has an inlet for receiving pressurized air for passing through the lower chamber, the grate, and the bed of particulate material to fluidize the particulate material. A cooling device is provided for receiving the particulate material from the bed and cooling same prior to the material being discharged to external equipment.
Claims29
A fluidized bed unit comprising a housing, a fluid distributor plate disposed in said housing and dividing said housing into an upper chamber and a lower chamber, a bed of particulate material including fuel supported by said plate and extending in said upper chamber, said lower chamber having an inlet for receiving pressurized air for passing through said lower chamber, said plate and said bed of particulate material to fluidize said particulate material, an enclosure having an inlet communicating with said bed for receiving particulate material from said bed and an outlet for discharging said particulate material to external apparatus, an additional fluid distributor plate disposed in said enclosure over which said particulate material passes, and means for passing a cooling fluid through said additional plate and said particulate material in said enclosure to cool said material.
A fluidized bed unit comprising a housing, a fluid distributor plate disposed in said housing and dividing said housing into an upper chamber and a lower chamber, a bed of particulate material including fuel supported by said plate and extending in said upper chamber, said lower chamber having an inlet for receiving pressurized air for passing through said lower chamber, said plate and said bed of particulate material to fluidize said particulate material, an enclosure for receiving a portion of the particulate material from said bed, means for passing a cooling fluid through said portion of the particulate material in the enclosure to cool said material, means for directing said cooling fluid from said enclosure into said bed of particulate material in said upper chamber, and means for passing a cooling liquid in a heat exchange relation to the particulate material in said enclosure.
A method of operating a fluidized bed comprising the steps of supporting a bed of particulate material including fuel in a housing, passing air through said bed of particulate material to fluidize said particulate material, withdrawing a portion of the particulate material from said bed to a fluid distribution plate, and passing air through said fluid distribution plate and said withdrawn material to cool said withdrawn material.
Dependencies are inferred from the claim text.