Fluidized bed combustion system and method having multiple furnace sections
AssigneeFoster Wheeler Energy Corporation
InventorDavid H. Dietz
Life of this patent
Estimating the term…
Abstract
A combustion system in which a furnace having a fluidized bed disposed therein is divided into multiple sections by one or more partitions. Openings are provided in the lower portion of each partition for permitting the fluidized bed material to flow between the furnace sections, and openings are provided in the upper portion of each partition for equalizing the gas pressure between the furnace sections.
Claims24
A fluidized bed combustion system comprising an enclosure, partition means disposed in said enclosure and dividing said enclosure into a plurality of sections, means for introducing particulate material including fuel to said enclosure, grate means disposed in each of said sections for supporting said particulate material, means for introducing air through said grate means and into said particulate material for fluidizing said particulate material to form a relatively dense region of said particulate material in the lower portion of each of said sections, a region of decreasing density in the middle portion of each of said sections and a substantially constant and low density region in the upper portion of each of said sections, at least one opening extending through the lower portion of said partition means adjacent said dense regions for permitting said particulate material to flow between said sections to equalize the height of said particulate material in said sections and at least one opening extending through the upper portion of said partition means adjacent said low density regions for equalizing the pressure between said sections.
A method of operating a fluidized bed combustion system comprising the steps of dividing an enclosure into a plurality of sections, introducing particulate material including fuel to said sections, supporting said particulate material in said sections, introducing air into said sections and into said particulate material for fluidizing said particulate material to form a relatively dense region of said particulate material in the lower portion of each of said sections, a region of decreasing density in the middle portion of each of said sections and a substantially constant and low density region in the upper portion of each of said sections, combusting said fuel to generate combustion gases in said sections, equalizing the heights of said dense regions of said particulate material in said sections and equalizing the combustion gas pressure between said sections.
A fluidized bed combustion system comprising an enclosure, partition means disposed in said enclosure and dividing said enclosure into a plurality of sections, means for introducing particulate material including fuel to said enclosure, grate means disposed in each of said sections for supporting said particulate material, means for introducing air through said grate means and into said particulate material for fluidizing said particulate material, at least one opening extending through the lower portion of said partition means for permitting said particulate material to flow between said sections to equalize the height of said particulate material in said sections, separating means disposed adjacent said enclosure for receiving a mixture of flue gases and entrained particulate material from said sections and for separating said entrained particulate material from said gases, heat exchange means extending between said separating means and said enclosure for receiving said separated particulate material from said separating means and for removing heat from said separated particulate material, and means for passing said separated particulate material back to said enclosure.
Dependencies are inferred from the claim text.