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US4378745A
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US
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Method and furnace for incineration of solid and liquid waste
Assignee: Norsk Hydro ASA
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Filing: 1980-06-25
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Granted: 1983-04-05
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Expires: 2000-06-25
Abstract
Abstract An incinerator includes primary and secondary combustion zones, the two zones being connected via an intermediate section having an interior in the form of a restricted annular space. The inner surface of the annular space is perforated, and secondary combustion air is introduced into the annular space through these perforations, whereby combustion gases and air under violent rotation expand into an enlarged secondary combustion zone.
Inventors
- 👤 Torkjell Flatland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:04
CPC Classifications
F; F23; F23G; F23G5/00; F23G5/08; F23G5/14; F23G5/16
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
244 words
A method for the incineration of solid and liquid waste, said method comprising: providing a primary combustion zone, a secondary combustion zone, and a restricted annular space extending from said primary combustion zone to said secondary combustion zone, with the area of said annular space being less than the areas of said primary and secondary combustion zones, and with said annular space having an inner surface defined by a substantially cylindrical central member having a height greater than its diameter; conducting primary combustion of waste in said primary combustion zone, thereby generating products of combustion including unburned combustibles and incombustible particles; passing said products of combustion from said primary combustion zone, smoothly through said annular space, toward said secondary combustion zone; introducing secondary combustion air, in a quantity sufficient to achieve complete combustion of said unburned combustibles, into said annular space in the form of high velocity air jets from a plurality of openings in said central member; introducing said secondary combustion air and said products of combustion into said secondary combustion zone under conditions of violent rotation and expansion, and thereby achieving mixing of said secondary combustion air and said unburned combustibles in said secondary combustion zone, and causing said incombustible particles to be thrown outwardly through an outlet and discharged from said secondary combustion zone; conducting secondary combustion of said unburned combustibles in said secondary combustion zone; and collecting said discharged incombustible particles in an ash pit separate from said combustion zones.
Claim 2
Independent Claim
244 words
A method for the incineration of solid and liquid waste, said method comprising: providing a primary combustion zone, a secondary combustion zone, and a restricted annular space extending from said primary combustion zone to said secondary combustion zone, with the area of said annular space being less than the areas of said primary and secondary combustion zones, and with said annular space having an inner surface defined by a substantially cylindrical central member having a height greater than its diameter; conducting primary combustion of waste in said primary combustion zone, thereby generating products of combustion including unburned combustibles and incombustible particles; passing said products of combustion from said primary combustion zone, smoothly through said annular space, toward said secondary combustion zone; introducing secondary combustion air, in a quantity sufficient to achieve complete combustion of said unburned combustibles, into said annular space in the form of high velocity air jets from a plurality of openings in said central member; introducing said secondary combustion air and said products of combustion into said secondary combustion zone under conditions of violent rotation and expansion, and thereby achieving mixing of said secondary combustion air and said unburned combustibles in said secondary combustion zone, and causing said incombustible particles to be thrown outwardly through an outlet and discharged from said secondary combustion zone; conducting secondary combustion of said unburned combustibles in said secondary combustion zone; and collecting said discharged incombustible particles in an ash pit separate from said combustion zones.
Claim 3
Dependent Claim
63 words
A method as claimed in claim 1, wherein said plurality of openings in said central member extend substantially tangentially of said annular space, and said step of introducing said secondary combustion air into said annular space comprises directing said high velocity air jets tangentially into said annular space, thereby imparting a rotating movement to said products of combustion and said secondary combustion air.
Claim 4
Dependent Claim
244 words
An incinerator for the incineration of solid and liquid waste, said incinerator comprising: a primary combustion zone for the primary combustion therein of waste and for the generation of products of combustion including unburned combustibles and incombustible particles; a secondary combustion zone for the secondary combustion therein of said unburned combustibles; a restricted annular space within an intermediate zone extending from said primary combustion zone to said secondary combustion zone for passing said products of combustion from said primary combustion zone to said secondary combustion zone, said annular space having an inner surface defined by a substantially cylindrical central member having a height greater than its diameter, the area of said annular space being less than the areas of said primary and secondary combustion zones; a plurality of opening means in said central member for introducing into said annular space secondary combustion air, in a quantity sufficient to achieve combustion of said unburned combustibles, in the form of high velocity air jets, thereby for causing said secondary combustion air and said products of combustion to be introduced into said secondary combustion zone under conditions of violent rotation and expansion, and thus for achieving mixing of said secondary combustion air and said unburned combustibles in said secondary combustion zone and causing said incombustible particles to be thrown outwardly; and outlet means in said secondary combustion zone for receiving said outwardly thrown incombustible particles and for discharging said incombustible particles outwardly from said secondary combustion zone.
Claim 5
Dependent Claim
244 words
An incinerator for the incineration of solid and liquid waste, said incinerator comprising: a primary combustion zone for the primary combustion therein of waste and for the generation of products of combustion including unburned combustibles and incombustible particles; a secondary combustion zone for the secondary combustion therein of said unburned combustibles; a restricted annular space within an intermediate zone extending from said primary combustion zone to said secondary combustion zone for passing said products of combustion from said primary combustion zone to said secondary combustion zone, said annular space having an inner surface defined by a substantially cylindrical central member having a height greater than its diameter, the area of said annular space being less than the areas of said primary and secondary combustion zones; a plurality of opening means in said central member for introducing into said annular space secondary combustion air, in a quantity sufficient to achieve combustion of said unburned combustibles, in the form of high velocity air jets, thereby for causing said secondary combustion air and said products of combustion to be introduced into said secondary combustion zone under conditions of violent rotation and expansion, and thus for achieving mixing of said secondary combustion air and said unburned combustibles in said secondary combustion zone and causing said incombustible particles to be thrown outwardly; and outlet means in said secondary combustion zone for receiving said outwardly thrown incombustible particles and for discharging said incombustible particles outwardly from said secondary combustion zone.
Claim 6
Dependent Claim
13 words
An incinerator as claimed in claim 3, wherein said central member is hollow.
Claim 7
Dependent Claim
50 words
An incinerator as claimed in claim 3, wherein said opening means in said central member extend substantially tangentially of said annular space, for thereby directing said high velocity air jets tangentially into said annular space and imparting a rotating movement to said products of combustion and said secondary combustion air.
Claim 8
Dependent Claim
24 words
An incinerator as claimed in claim 3, wherein said secondary combustion zone expands outwardly in size from the entrance thereinto of said annular space.
Claim 9
Dependent Claim
36 words
An incinerator as claimed in claim 3, further comprising passage means for receiving said discharged incombustible particles from said outlet means and for directing said incombustible particles to an ash pit separate from said combustion zones.
Claim 10
Dependent Claim
31 words
An incinerator as claimed in claim 3, wherein said central member has a bottom portion with inclined surfaces for facilitating the passage of said products of combustion into said annular space.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-04 | 1986-10-04 | 1987-04-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-04 | 1990-10-04 | 1991-04-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-04 | 1994-10-04 | 1995-04-05 | $7700.00 | Window Closed / Lapsed |