US3777680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace for combined incineration of rubbish, garbage, and sewage sludge
Assignee: Krupp Wilputte Corp
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Filing: 1972-06-27
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Granted: 1973-12-11
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Expires: 1992-06-27
Abstract
Abstract The specification discloses a furnace of the multihearth type, comprising a lower combustion zone having a plurality of vertically spaced annular hearths and an upper drying zone having a plurality of vertically spaced annular hearths. The central area of the drying zone hearths is open and provides a passage for rubbish and garbage to fall directly from a hopper at the top of the furnace upon the uppermost hearth in the combustion zone. Rabbling apparatus moves the rubbish and garbage progressively from hearth to hearth and thence in ash form to a removal chute. The sewage sludge is deposited on the uppermost of the drying zone hearths and moved progressively downward by rabbling apparatus in a zig-zag path from hearth to hearth and then falls in a dry state to the uppermost hearth of the combustion zone, where it is incinerated along with the garbage and rubbish, and then removed in ash form via the removal chute. A forced air system for cooling the rabbling apparatus is also provided.
Inventors
- 👤 J Eck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:43
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/24; F23G5/28
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
175 words
Apparatus for incinerating waste material, comprising a furnace having a lower combustion zone and an upper drying zone, said lower combustion zone having a plurality of superposed hearths and rabbling means for agitating and advancing the waste material deposited in said combustion zone hearths from hearth to hearth and thence to an ash removal chute, said drying zone having a plurality of superposed hearths in annular form, the aligned central openings in which provide a passage via which waste material of non-sludge type may be dropped gravitationally directly upon the uppermost of the combustion zone hearths, a first hopper means via which to deposit waste material of the non-sludge type into said passage, a second hopper means via which to deposit waste material of the sludge type directly upon the uppermost of the drying zone hearths, and rabbling means for agitating and advancing the sludge type waste material from hearth to hearth within the drying zone to first effect drying thereof and then deposit upon the uppermost ones of said hearths in the combustion zone.
Claim 2
Dependent Claim
175 words
Apparatus for incinerating waste material, comprising a furnace having a lower combustion zone and an upper drying zone, said lower combustion zone having a plurality of superposed hearths and rabbling means for agitating and advancing the waste material deposited in said combustion zone hearths from hearth to hearth and thence to an ash removal chute, said drying zone having a plurality of superposed hearths in annular form, the aligned central openings in which provide a passage via which waste material of non-sludge type may be dropped gravitationally directly upon the uppermost of the combustion zone hearths, a first hopper means via which to deposit waste material of the non-sludge type into said passage, a second hopper means via which to deposit waste material of the sludge type directly upon the uppermost of the drying zone hearths, and rabbling means for agitating and advancing the sludge type waste material from hearth to hearth within the drying zone to first effect drying thereof and then deposit upon the uppermost ones of said hearths in the combustion zone.
Claim 3
Dependent Claim
56 words
Apparatus for incinerating waste material according to claim 1, wherein means includes flow of combustion heat from the combustion zone over said hearths in said drying zone to effect drying of said sludge type waste, and damper means in the combustion zone of said furnace controls the degree of ambient air admitted to the combustion zone.
Claim 4
Dependent Claim
23 words
Apparatus for incinerating waste material according to claim 1, wherein said first hopper means is disposed inboard of the said second hopper means.
Claim 5
Dependent Claim
34 words
Apparatus for incinerating waste material according to claim 1, wherein a common drive means is provided for the said rabbling means in the combustion zone and the said rabbling means in the drying zone.
Claim 6
Dependent Claim
53 words
Apparatus for incinerating waste material according to claim 4, wherein said common drive means comprises a vertically disposed hollow shaft extending centrally through the hearths of the combustion zone and through the central openings of the hearths in the drying zone, and wherein means provides a flow of cooling air through said shaft.
Claim 7
Dependent Claim
82 words
Apparatus for incinerating waste material according to claim 5, wherein a hollow tube is supported coaxially within said hollow shaft, wherein said rabbling means comprises hollow rabbling arms communicating with the said hollow shaft, which rabbling arms have coaxially extending tubes therein open at their outer ends to the interior of the arms and connected at their inner ends to the said hollow tube, whereby cooling air is directed through the rabbling arms and to atmosphere out through the said hollow tube.
Claim 8
Independent Claim
182 words
The method of incinerating waste material, including in part sewage sludge having a high percentage water content and in part rubbish and garbage having relatively low percentage water content, in the same furnace without production of noxious or air pollutant gases, which method comprises the steps of: a. passing sewage sludge successively over a first series of superposed coaxial hearths by rabbling means while subject to an upward draft of hot air from a combustion zone beneath said hearths to effect drying of said sludge, b. depositing and passing rubbish and garbage successively over a second series of superposed coaxial hearths within the combustion zone in by-pass of the said first series of superposed coaxial hearths, c. depositing the dried sludge on the first one of the second series of superposed hearths within the said combustion zone and moving the combined waste material thereon by rabbling means in succession over the superposed coaxial hearths of said second series, and d. removing the ash remanence of said combined waste material from the last of the second series of hearths in the combustion zone.
Claim 9
Independent Claim
182 words
The method of incinerating waste material, including in part sewage sludge having a high percentage water content and in part rubbish and garbage having relatively low percentage water content, in the same furnace without production of noxious or air pollutant gases, which method comprises the steps of: a. passing sewage sludge successively over a first series of superposed coaxial hearths by rabbling means while subject to an upward draft of hot air from a combustion zone beneath said hearths to effect drying of said sludge, b. depositing and passing rubbish and garbage successively over a second series of superposed coaxial hearths within the combustion zone in by-pass of the said first series of superposed coaxial hearths, c. depositing the dried sludge on the first one of the second series of superposed hearths within the said combustion zone and moving the combined waste material thereon by rabbling means in succession over the superposed coaxial hearths of said second series, and d. removing the ash remanence of said combined waste material from the last of the second series of hearths in the combustion zone.
References Cited (Backward Citations)
US976175A
Cited
US1647050A
Cited
US2015052A
Cited
US2119601A
Cited
US2107127A
Cited
US2744477A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |