US3922137A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for admixing fuel and combustion air
Assignee: PETROCANADA Inc A CORP OF CANADA
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Filing: 1974-11-04
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Granted: 1975-11-25
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Expires: 1994-11-04
Abstract
Abstract This invention provides apparatus for admixing combustion air, particularly air supplied at low pressure, with fluid or finely divided solid fuel for combustion, preferably in substantially stoichiometric proportions, in which air is passed from a windbox spirally inwardly between multiple overlapping vanes into a vortex chamber, thence through a coaxially aligned frusto-conical nozzle into a coaxially aligned cylindrical combustion chamber with the fuel being injected into the air passing through the nozzle, the critical dimensions of the air passage being related so that the flow of the air is constrained by its passage between the vanes, through the vortex chamber, through the nozzle and into the combustion chamber to generate therein a tangential velocity (swirl) which is sufficiently strong to establish a critical recirculating centre core of combustion gases in the combustion chamber and ensure complete combustion of the fuel.
Inventors
- 👤 Charles F Peczeli
- 👤 Edward T Tyrcz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:02
CPC Classifications
F; F23; F23C; F23C7/00; F23C7/002; F23C7/004; F23D; F23D1/00; F23C2202/00; F23C2202/40
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
263 words
An apparatus for admixing combustion air and fluid or finely divided solid fuel in substantially stoichiometric proportions for combustion, comprising: 1. a windbox for maintaining a supply of combustion air under pressure, said windbox having an outer wall and a parallel inner wall contiguous to 2. a cylindrical combustion chamber, 3. a fuel injector, 4. a plurality of overlapping vanes spaced around a hypothetical cylindrical surface coaxial with said fuel injector and extending between said outer and inner walls and perpendicular thereto to form a vortex chamber, the diameter of said surface in inches being designated as a dimension D1 and the length thereof, defined by the distance between the said parallel outer and inner walls, being designated as a dimension A in inches which is substantially 0.64 D1, the total minimum inlet area I between said vanes in square inches being substantially (0.43 D12 - 7.63), said fuel injector extending through said outer wall and hypothetical cylinder with its discharge end terminating in 5. a substantially 45* frusto-conical nozzle extending through said inner wall between the vortex chamber and the combustion chamber coaxially with said fuel injector, the largest circular diameter of said nozzle being adjacent the vortex chamber and having a diameter D2 in inches which is substantially 0.95 D1, the smallest circular diameter of the nozzle having a dimension D3 of substantially (0.34 D12 - 6)1/2 inches, and 6. the forward end wall of a combustor, adjacent said nozzle and normal to the axis thereof, with a contiguous cylindrical side wall forming said cylindrical combustion chamber coaxial with said nozzle.
Claim 2
Independent Claim
263 words
An apparatus for admixing combustion air and fluid or finely divided solid fuel in substantially stoichiometric proportions for combustion, comprising: 1. a windbox for maintaining a supply of combustion air under pressure, said windbox having an outer wall and a parallel inner wall contiguous to 2. a cylindrical combustion chamber, 3. a fuel injector, 4. a plurality of overlapping vanes spaced around a hypothetical cylindrical surface coaxial with said fuel injector and extending between said outer and inner walls and perpendicular thereto to form a vortex chamber, the diameter of said surface in inches being designated as a dimension D1 and the length thereof, defined by the distance between the said parallel outer and inner walls, being designated as a dimension A in inches which is substantially 0.64 D1, the total minimum inlet area I between said vanes in square inches being substantially (0.43 D12 - 7.63), said fuel injector extending through said outer wall and hypothetical cylinder with its discharge end terminating in 5. a substantially 45* frusto-conical nozzle extending through said inner wall between the vortex chamber and the combustion chamber coaxially with said fuel injector, the largest circular diameter of said nozzle being adjacent the vortex chamber and having a diameter D2 in inches which is substantially 0.95 D1, the smallest circular diameter of the nozzle having a dimension D3 of substantially (0.34 D12 - 6)1/2 inches, and 6. the forward end wall of a combustor, adjacent said nozzle and normal to the axis thereof, with a contiguous cylindrical side wall forming said cylindrical combustion chamber coaxial with said nozzle.
Claim 3
Dependent Claim
86 words
An apparatus as claimed in claim 1 for a normal heat generation rate designated as its rating R in 106 Btu/hr. with air supplied to the windbox under a pressure of 6 inches of water column at 80*F in which the angLe of the frusto-conical nozzle is 45* and the other critical dimensions of the apparatus are related to said rating R by the following formulae: I 7.63R D2 4.03 (R + 1)1/2 D1 4.23 (R + 1)1/2 D3 2.45 R1/2 A 2.69 (R + 1)1/2.
Claim 4
Dependent Claim
4 words
a cylindrical combustion chamber,
Claim 5
Dependent Claim
4 words
a cylindrical combustion chamber,
Claim 6
Dependent Claim
3 words
a fuel injector,
Claim 7
Dependent Claim
3 words
a fuel injector,
Claim 8
Dependent Claim
16 words
An apparatus as claimed in claim 1 in which the fuel injector is an oil atomizer.
Claim 9
Dependent Claim
33 words
An apparatus as claimed in claim 1 in which there are at least six vanes and the ratio of the overlapping to the minimum distance between adjacent vanes is at least about 3:1.
Claim 10
Dependent Claim
109 words
a plurality of overlapping vanes spaced around a hypothetical cylindrical surface coaxial with said fuel injector and extending between said outer and inner walls and perpendicular thereto to form a vortex chamber, the diameter of said surface in inches being designated as a dimension D1 and the length thereof, defined by the distance between the said parallel outer and inner walls, being designated as a dimension A in inches which is substantially 0.64 D1, the total minimum inlet area I between said vanes in square inches being substantially (0.43 D12 - 7.63), said fuel injector extending through said outer wall and hypothetical cylinder with its discharge end terminating in
Claim 11
Dependent Claim
109 words
a plurality of overlapping vanes spaced around a hypothetical cylindrical surface coaxial with said fuel injector and extending between said outer and inner walls and perpendicular thereto to form a vortex chamber, the diameter of said surface in inches being designated as a dimension D1 and the length thereof, defined by the distance between the said parallel outer and inner walls, being designated as a dimension A in inches which is substantially 0.64 D1, the total minimum inlet area I between said vanes in square inches being substantially (0.43 D12 - 7.63), said fuel injector extending through said outer wall and hypothetical cylinder with its discharge end terminating in
Claim 12
Dependent Claim
66 words
a substantially 45* frusto-conical nozzle extending through said inner wall between the vortex chamber and the combustion chamber coaxially with said fuel injector, the largest circular diameter of said nozzle being adjacent the vortex chamber and having a diameter D2 in inches which is substantially 0.95 D1, the smallest circular diameter of the nozzle having a dimension D3 of substantially (0.34 D12 - 6)1/2 inches, and
Claim 13
Dependent Claim
66 words
a substantially 45* frusto-conical nozzle extending through said inner wall between the vortex chamber and the combustion chamber coaxially with said fuel injector, the largest circular diameter of said nozzle being adjacent the vortex chamber and having a diameter D2 in inches which is substantially 0.95 D1, the smallest circular diameter of the nozzle having a dimension D3 of substantially (0.34 D12 - 6)1/2 inches, and
Claim 14
Dependent Claim
31 words
the forward end wall of a combustor, adjacent said nozzle and normal to the axis thereof, with a contiguous cylindrical side wall forming said cylindrical combustion chamber coaxial with said nozzle.
Claim 15
Dependent Claim
31 words
the forward end wall of a combustor, adjacent said nozzle and normal to the axis thereof, with a contiguous cylindrical side wall forming said cylindrical combustion chamber coaxial with said nozzle.
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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) | 1978-11-24 | 1979-05-26 | 1979-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-24 | 1983-05-26 | 1983-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-24 | 1987-05-26 | 1987-11-25 | $7700.00 | Window Closed / Lapsed |