US 4,108,088 AGranted

Rotary incinerator

AssigneeMet-Pro Systems, Inc.

InventorRoy B. Burden, Jr.

Life of this patent

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Abstract

An incinerator or dryer for sewage sludge and the like includes a horizontal rotating combustion chamber with a protruding internal helical conveyor. The wet sludge enters at one end and dry ash is discharged from the other end. Heat scavenging devices include lengths of chain having ends which are secured to the helical conveyor. These chains dip into the wet sludge when the drum rotates. As the drum rotates further, the chains move to a hanging position exposing the wet sludge to the combustion gas stream which flows through the drum. The dry ash lies in the bottom of the drum and is transported by the helical conveyor to an ash wheel at the opposite end of the drum. This wheel separates the ash from the combustion gases by rotating a series of ash holding plates which pick up the ash at the bottom of the drum and discharge it at the top of the rotation of the ash wheel.

Claims10

Dependent claims

Material treatment apparatus comprising:

a substantially horizontal rotating heated chamber, wet material to be dried being supplied to one end of said rotating chamber,
a helical conveyor on the inside of said rotating chamber for transporting said material from one end of said chamber to the other end of said chamber,
a plurality of elongated flexible metallic heat scavening elements secured at the ends thereof to said helical conveyor so that each flexible element lies in contact with said wet material when it is in the bottom of said rotating chamber, and wherein said flexible elements move to a hanging position as said chamber rotates to a position wherein the flexible element is at the top thereof, and
a primary burner fired by auxiliary fuel at said one end, gases from said primary burner blowing through the length of said drum and into contact with said flexible elements when they are disposed in a hanging position, the wet material clinging to said flexible elements having the moisture therein volatized by said gases, the remaining dry material being transported to the other end of said rotating chamber by said helical conveyor.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 05/744,591Filed 24 Nov 1976
Granted: 22 Aug 1978
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F26B 23/02
Heating arrangements: using combustion heating
F23G 5/20
Incineration of waste ; Incinerator constructions; Details, accessories or control therefor: having rotating or oscillating drums
F26B 11/0459
Using heated internal elements, e.g. which move through or convey the materials to be dried: the elements being chains
F26B 17/008
Machines or apparatus for drying materials in loose, plastic, or fluidised form, e.g. granules, staple fibres, with progressive movement: the…