Fluidized bed steam generation system and method having an external heat exchanger
AssigneeFoster Wheeler Energy Corporation
InventorIqbal F. Abdulally
Life of this patent
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Abstract
A fluidized bed steam generation system and method in which an external heat exchanger is located adjacent a furnace section. A mixture of flue gases and entrained particulate materials from a fluidized bed in the furnace section are separated and the flue gases are passed to a heat recovery section and the separated particulate material back to the fluidized bed in the furnace section. Particulate material from the fluidized bed in the furnace section is circulated through the external heat exchanger to add heat to water, steam or a steam/water mixture before the material is passed back to the furnace section. Water is passed through the furnace section, the heat recovery section, and the external heat exchanger to convert the water to steam.
Claims11
A fluidized bed steam generation system including a furnace section, a fluidized bed of particulate material including fuel formed in said furnace section, a separating section for receiving a mixture of entrained particulate material and flue gases from the combustion of said fuel from the fluidized bed in said furnace section and separating said entrained particulate material from said flue gases, a heat recovery section for receiving said separated flue gases, means for passing said separated particulate material from said separating section back into the fluidized bed in said furnace section, an external heat exchanger disposed adjacent said furnace section housing, first conduit means connecting said furnace section to said external heat exchanger for passing particulate material from said furnace section to said external heat exchanger, second conduit means connecting said external heat exchanger to said furnace section for permitting said material to flow from said external heat exchanger back to said furnace section, and means for passing water in a heat exchange relation to the particulate material in said furnace section and in said external heat exchanger, and to the separated flue gasses in said heat recovery section for adding heat to said water and converting it to steam.
A method of generating steam comprising the steps of fluidizing a bed of particulate material including fuel in a furnace section, the flue gases from the combustion of said fuel from the fluidized bed entraining said particulate material, separating said entrained particulate material from said flue gases, passing said said separated flue gases through a heat recovery section, passing said separated particulate material back into the fluidized bed in said furnace section, connecting said furnace section to a external heat exchanger for passing particulate material from said furnace section to said external heat exchanger, connecting said external heat exchanger to said furnace section for permitting said particulate material to flow from said external heat exchanger back to said furnace section, passing water in a heat exchange relation to the particulate material in said furnace section and in said external heat exchanger and to the separated flue gasses in said heat recovery section for adding heat to said water and converting it to steam.
Dependencies are inferred from the claim text.