Fluidized bed mass burner for solid waste
OwnerRichard D. Smithinventor
Life of this patent
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Abstract
A fluid bed combustion apparatus for burning heterogeneous solid waste material and being particularly adapted for burning light, bulky combustible materials usually found in municipal waste. The apparatus includes means for removing a portion of the fluid bed, cooling it below the ignition temperature of the waste material and delivering it atop the incoming waste material so as to submerge the waste material and to confine its combustion within the fluid bed.
Claims12
In a bubbling-type fluid bed combustion apparatus including a combustion chamber, an air pervious support within said chamber, a quantity of finely divided inert particles disposed upon said support, means for introducing a supply of air into said chamber beneath said support for forming a bubbling-type fluid bed of said inert particles having a distinct surface, means for heating said inert particles to a temperature above the ignition temperature of a combustible material, means for delivering said combustible material into said chamber onto said distinct surface of said fluid bed, and means for venting the products of combustion out of said chamber, the improvement comprising:
- means for removing a portion of said inert particles from said fluid bed, and
- means for transporting said portion of said inert particles including,
- means for cooling said portion of said inert particles to a temperature below the ignition temperature of said combustible material, and
- means for delivering said cooled portion of said inert particles atop said delivered combustible material so as to submerge said combustible material beneath said distinct surface of said fluid bed.
A method of combusting waste material in a fluid bed combustion chamber comprising the steps of
- providing a bed of finely divided inert particles.
- fluidizing said bed of particles with an upwardly directed stream of air,
- heating said bed of particles to a temperature above the ignition temperature of said waste material,
- depositing said waste material atop said fluid bed at a localized zone,
- withdrawing a portion of said bed of particles,
- cooling said portion of said bed of particles to a temperature below the ignition temperature of said waste material,
- transporting said cooled particles to a location above said localized zone,
- dropping said cooled particles atop said deposited waste material so as to submerge said waste material below the surface of said fluid bed, and
- combusting said waste material within said fluid bed.
Dependencies are inferred from the claim text.