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US 4,325,327 AGranted
Hybrid fluidized bed combuster
AssigneeCombustion Engineering, Inc.
InventorsPrabhudas P. Kantesaria, Francis T. Matthews
Life of this patent
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Abstract
A first atmospheric bubbling fluidized bed furnace is combined with a second turbulent, circulating fluidized bed furnace to produce heat efficiently from crushed solid fuel. The bed of the second furnace receives the smaller sizes of crushed solid fuel, unreacted limestone from the first bed, and elutriated solids extracted from the flu gases of the first bed. The two-stage combustion of crushed solid fuel provides a system with an efficiency greater than available with use of a single furnace of a fluidized bed.
Claims6
A system for burning solid fuel, including,
- a first furnace in which is supported a fluidized bed of crushed solid fuel and limestone,
- a supply of crushed solid fuel,
- means for separating the supply of crushed fuel into a predetermined coarse size and a predetermined fine size,
- a conduit connected to the separating means and the first furnace to supply the first furnace with the crushed fuel of predetermined coarse size,
- a second furnace,
- a conduit connected to the separating means and the second furnace to supply the second furnace with crushed fuel of predetermined fine size,
- means connected to the first furnace to supply combustion air at a velocity within the range of 6-12 ft./sec.,
- means connected to the second furnace to supply combustion air at a velocity within the range of 15-35 ft./sec.,
- means connected to the first furnace to supply crushed limestone for absorption of sulfur compounds from the crushed fuel burned in the first furnace,
- a conduit connected between the first and second furnaces for supplying the second furnace with incompletely utilized limestone drained from the first furnace,
- and heat exchangers mounted in the furnaces to absorb their heat of combustion into water for the production of steam.
8 more elements
Dependencies are inferred from the claim text.