Steam generator and method of operating a steam generator utilizing separate fluid and combined gas flow circuits
AssigneeFoster Wheeler Energy Corporation
InventorsVenkatram Seshamani, Walter R. Campbell, Paul E. Moore
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Abstract
A steam generator and method for operating same in which a plurality of beds of combustible particulate material are established and air is introduced to each of the beds for fluidizing the beds. The flue gases and entrained fine particulate material from each bed are combined and the particulate material then separated from the flue gases externally of the beds and introduced back into one of the beds. Independent fluid circuits are established including some in heat exchange relation to the separate beds, for independently controlling the steam generation rate and the temperatures of the reheat steam, and the superheat steam.
Claims22
A method of operating a steam generator comprising the steps of forming a first bed of particulate material in a vessel, forming at least one additional bed of particulate material in said vessel, introducing air and fuel into each of said beds to fluidize said beds and promote the combustion of said fuel, establishing a first flow circuit for passing water in a heat exchange relation to said additional bed for converting said water to steam, combining a mixture of flue gases and the entrained particulate material from said additional bed with that of said first bed, separating said entrained particle materials from the flue gases of said combined mixture, passing said separated particles back into said first bed, passing said steam to external equipment for using said steam, establishing a second flow circuit independent of said first flow circuit for receiving said steam from said equipment, and passing said separated flue gases in a heat exchange relation with said second flow circuit for reheating said steam.
A steam generator comprising a vessel, means of forming a first bed of particulate material in said vessel, means of forming at least one additional bed of particulate material in said vessel, means for introducing air and fuel into each of said beds to fluidize said beds and promote the combustion of said fuel, first flow circuit means for passing water in a heat exchange relation to said additional bed for converting said water to steam, means for directing a mixture of flue gases and the entrained particulate material from said additional bed into said first bed where it combines with a mixture of flue gases and entrained particulate material from said first bed, means for separating said entrained particle materials from the flue gases of said combined mixture, means for passing said separated particles back into said first bed, means for passing said steam to external equipment for using said steam, second flow circuit means independent of said first flow circuit means for receiving said steam from said equipment, and means for passing said separated flue gases in a heat exchange relation with said second flow circuit means for reheating said steam.
Dependencies are inferred from the claim text.