Patent US4089278A successfully refreshed from Google Patents.
US4089278A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Furnace, especially a coal burning furnace, and method of operation
Assignee: Individual
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Filing: 1977-06-22
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Granted: 1978-05-16
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Expires: 1997-06-22
Abstract
Abstract A furnace, especially a coal burning furnace, in which the coal to be burned is placed on a grate near the bottom of a combustion chamber. According to the invention, a fan, or blower, has the inlet and the outlet connected to conduits which lead downwardly at opposite sides of the furnace and turn inwardly into the combustion chamber and blow the flue gases back into the combustion chamber at about 3 inches above the flame center and slightly forward thereof to provide an over and under draft. The conduits extending downwardly from the fan, or blower, at the sides of the boiler preferably have clean-outs at the lower ends thereof, with doors, and solid particles entrained in the flue gas which drop out therefrom can thereby be removed from the conduits. Further, each conduit is preferably provided with a blowdown nozzle at the top to which compressed air can be supplied to blow down the conduit and thereby dislodge solid material that may accumulate therein during operation of the boiler.
Inventors
- 👤 Cecil R. Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:03
CPC Classifications
F; F23; F23J; F23J3/00; F22; F22B; F22B9/00; F22B9/02; F22B9/08; F23B; F23B5/00; F23B5/02; F23B7/00; F23B7/002; F23B7/007
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
102 words
In a combustion system furnace; a combustion chamber having a grate at the bottom to support material to be burned, a stack in fluid communication with said combustion chamber, fan means connected to the stack and operable for withdrawing gases therefrom, conduit means for fluid communication between the discharge side of said fan means and said combustion chamber above said grate, first means comprising a fixed orifice in said stack for restricting flow of ambient air into said stack to be predetermined limited flow, second means for admitting flow of ambient air in unrestricted quantities into the combustion chamber below said grate.
Claim 2
Dependent Claim
102 words
In a combustion system furnace; a combustion chamber having a grate at the bottom to support material to be burned, a stack in fluid communication with said combustion chamber, fan means connected to the stack and operable for withdrawing gases therefrom, conduit means for fluid communication between the discharge side of said fan means and said combustion chamber above said grate, first means comprising a fixed orifice in said stack for restricting flow of ambient air into said stack to be predetermined limited flow, second means for admitting flow of ambient air in unrestricted quantities into the combustion chamber below said grate.
Claim 3
Dependent Claim
55 words
The system of claim 1 wherein said stack has a predetermined cross-sectional area, said first means comprising a fixed orifice in the said stack for providing flow between the ambient air and the suction side of the said fan, said orifice having an area in the order of one percent of said stack cross-sectional area.
Claim 4
Dependent Claim
34 words
The system of claim 1 with trap means with clean out door means in said conduit means near the lower end thereof to receive solids entrained in the gases flowing in said conduit means.
Claim 5
Dependent Claim
35 words
The system of claim 3 including means in said conduit means near the upper end thereof for blowing air downwardly in said conduit means to dislodge solids which may accumulate therein into said trap means.
Claim 6
Independent Claim
76 words
The method of combusting which comprises the steps of: supporting combustible material on a grate near the bottom of a combustion chamber and igniting the material, withdrawing the combustion gases from the chamber near the top thereof, admitting a predetermined limited quantity of ambient air through a fixed orifice into the withdrawn gases, blowing the withdrawn gases above the flame center, admitting an unrestricted flow of ambient air to the combustion material below the flame center.
Claim 7
Independent Claim
76 words
The method of combusting which comprises the steps of: supporting combustible material on a grate near the bottom of a combustion chamber and igniting the material, withdrawing the combustion gases from the chamber near the top thereof, admitting a predetermined limited quantity of ambient air through a fixed orifice into the withdrawn gases, blowing the withdrawn gases above the flame center, admitting an unrestricted flow of ambient air to the combustion material below the flame center.
Claim 8
Dependent Claim
149 words
In a furnace; a combustion chamber having a grate at the bottom to support material to be burned, a stack in fluid communication with said combustion chamber, fan means connected to the stack and operable for withdrawing gases therefrom, conduit means for fluid communication between the discharge side of said fan means and said combustion chamber above said grate, first means for restricting flow of ambient air into said stack to a predetermined limited flow, second means for admitting flow of ambient air in unrestricted quantities below said grate, said conduit means comprises a pair of conduits extending from the discharge side of said fan means downwardly along each side of the furnace and into the combustion chamber above said grate on respective sides of said chamber, each said conduit having trap means therein near the lower end and each conduit also having means for blowing air downwardly therein.
Claim 9
Dependent Claim
149 words
In a furnace; a combustion chamber having a grate at the bottom to support material to be burned, a stack in fluid communication with said combustion chamber, fan means connected to the stack and operable for withdrawing gases therefrom, conduit means for fluid communication between the discharge side of said fan means and said combustion chamber above said grate, first means for restricting flow of ambient air into said stack to a predetermined limited flow, second means for admitting flow of ambient air in unrestricted quantities below said grate, said conduit means comprises a pair of conduits extending from the discharge side of said fan means downwardly along each side of the furnace and into the combustion chamber above said grate on respective sides of said chamber, each said conduit having trap means therein near the lower end and each conduit also having means for blowing air downwardly therein.
Claim 10
Dependent Claim
17 words
A system according to claim 6 which includes a variable speed electric motor driving said fan means.
Claim 11
Dependent Claim
26 words
A system according to claim 6 in which the combined cross sectional areas of said conduits is less than the cross sectional area of said stack.
Claim 12
Dependent Claim
67 words
A system according to claim 1 in which said conduit means comprises a pair of conduits extending from the discharge side of said fan means downwardly along each side of the furnace and into the combustion chamber above said grate on respective sides of said chamber, each said conduit having trap means therein near the lower end and each conduit having means for blowing air downwardly therein.
Claim 13
Dependent Claim
132 words
In a combustion system furnace for a boiler; a boiler having first and second horizontally spaced ends; an enclosed combustion chamber having a grate at the bottom to support fuel to be burned being at said first end; a stack being at said second end; fan means having an intake side connected to said stack and operable to withdraw gases therefrom; conduit means for providing enclosed fluid passage between the discharge side of the fan means and said combustion chamber above said grate; first means comprising a fixed orifice in said stack on the intake side of said fan means for restricting flow of ambient air into said stack to a predetermined limited flow; second means for admitting flow of ambient air in unrestricted quantities into the combustion chamber below said grate.
Claim 14
Dependent Claim
132 words
In a combustion system furnace for a boiler; a boiler having first and second horizontally spaced ends; an enclosed combustion chamber having a grate at the bottom to support fuel to be burned being at said first end; a stack being at said second end; fan means having an intake side connected to said stack and operable to withdraw gases therefrom; conduit means for providing enclosed fluid passage between the discharge side of the fan means and said combustion chamber above said grate; first means comprising a fixed orifice in said stack on the intake side of said fan means for restricting flow of ambient air into said stack to a predetermined limited flow; second means for admitting flow of ambient air in unrestricted quantities into the combustion chamber below said grate.
Claim 15
Dependent Claim
43 words
The system of claim 10 including flue means for providing an enclosed fluid passage through said boiler between said chamber and said stack to the intake side of said fan means to provide enclosed combustion gas passage through said boiler to said stack.
Claim 16
Dependent Claim
19 words
The system of claim 11 wherein said flue means comprises a plurality of substantially parallel, elongated, transversely spaced flues.
Claim 17
Dependent Claim
75 words
The system of claim 12 including a first substantially vertical flue sheet between said chamber and said boiler; said flue sheet having a plurality of openings therein; first ends of said flues being in fluid tight relation with said openings; a second substantially vertical flue sheet being between said boiler and said stack and having a second plurality of openings therein; second ends of said flues being in fluid tight relation with said second openings.
Claim 18
Dependent Claim
40 words
The system of claim 10 wherein said conduit means comprises a pair of down-comer tubes one of said tubes being on one side of said stack and the other of said tubes being on the other side of said stack.
Claim 19
Dependent Claim
85 words
The system of claim 10 wherein said orifice is at the upper end of said stack; said conduit means having trap means at the chamber end thereof for receiving particles from said stack; said conduit means being connected to said stack below said orifice whereby heavier smoke particles will be carried upwardly in said stack beyond said fan means and into the restricted flow from said orifice after which said particles will be carried by fan means through said conduit means to said trap means.
Claim 20
Independent Claim
33 words
The system of clam 10 wherein said fan means comprises a steam motor in driving relation to a fan; a steam outlet being on said boiler in fluid power communication with said motor.
Claim 21
Independent Claim
33 words
The system of clam 10 wherein said fan means comprises a steam motor in driving relation to a fan; a steam outlet being on said boiler in fluid power communication with said motor.
Claim 22
Dependent Claim
43 words
The system of claim 10 including a collector tank; first box inlet for receiving steam into said tank; a second tank inlet for receiving distilled water; a tank outlet and pumping means for pumping distilled water from said tank outlet into said boiler.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-15 | 1981-11-14 | 1982-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-15 | 1985-11-14 | 1986-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-15 | 1989-11-14 | 1990-05-16 | $7700.00 | Window Closed / Lapsed |