US3826079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion method with selective cooling and controlled fuel mixing
Assignee: Phillips Petroleum Co
•
Filing: 1971-12-15
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Granted: 1974-07-30
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Expires: 1991-12-15
Abstract
Abstract New combustors, and methods of operating same, which produce lower emissions, particularly lower emissions of nitrogen oxides. Method and means are provided for reducing the flame temperature in a primary combustion zone of said combustors.
Inventors
- 👤 H Quigg
- 👤 R Schirmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:22
CPC Classifications
F; F23; F23R; F23R3/00; F23R3/28; F23R3/02; F23R3/04; F23R3/10; F23R3/12; Y; Y02; Y02T; Y02T50/00; Y02T50/60
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
159 words
A method for reducing the formation of nitrogen oxides formed in the combustion of a fuel in a combustor, which method comprises: introducing a swirling stream of air into the upstream end portion of a combustion zone as the sole stream of primary air introduced into said combustion zone; forming and introducing an annular stratum of said fuel around said stream of air by introducing said fuel in a direction toward and which is from tangent to less than perpendicular, but non-parallel, to the outer periphery oF said stream of air so as to effect controlled mixing of said fuel and air at the interface to produce an annular fuel-air mixture; passing said fuel-air mixture into said combustion zone as the sole fuel and air supplied to the upstream portion of said combustion zone; burning said fuel; and decreasing the flame temperature within said combustion zone by removing heat from an extended outer wall surface of said combustion zone.
Claim 2
Independent Claim
159 words
A method for reducing the formation of nitrogen oxides formed in the combustion of a fuel in a combustor, which method comprises: introducing a swirling stream of air into the upstream end portion of a combustion zone as the sole stream of primary air introduced into said combustion zone; forming and introducing an annular stratum of said fuel around said stream of air by introducing said fuel in a direction toward and which is from tangent to less than perpendicular, but non-parallel, to the outer periphery oF said stream of air so as to effect controlled mixing of said fuel and air at the interface to produce an annular fuel-air mixture; passing said fuel-air mixture into said combustion zone as the sole fuel and air supplied to the upstream portion of said combustion zone; burning said fuel; and decreasing the flame temperature within said combustion zone by removing heat from an extended outer wall surface of said combustion zone.
Claim 3
Dependent Claim
43 words
A method according to claim 1 wherein said fuel and said air are expanded during at least a portion of said mixing thereof, and said expansion of said fuel and said air is initiated immediately after the initial contact at said interface therebetween.
Claim 4
Dependent Claim
95 words
A method according to claim 2 wherein: said stream of air is initially introduced into a swirl zone having a diameter less than the diameter of said combustion zone; said initial contact between said fuel and said air occurs upon the exit of said air from said swirl zone; and said expansion of said fuel and said air occurs in a uniform and graduated manner from the volume thereof in the region of said initial contact to the volume of said combustion chamber at a point in said combustion chamber downstream from said initial contact.
Claim 5
Dependent Claim
35 words
A method according to claim 3 wherein said fuel is introduced at an angle within the range of from about 15* to about 75* with respect to the outer periphery of said stream of air.
Claim 6
Dependent Claim
53 words
A method according to claim 1 wherein: said flame temperature is reduced by passing a second stream of air over said extended outer wall surface of said combustion zone; and said second stream of air is introduced into said combustion zone downstream from the point of introduction of said swirling stream of air.
Claim 7
Dependent Claim
30 words
A method according to claim 5 wherein a third stream of air is introduced into said combustion zone downstream from the point of introduction of said second stream of air.
References Cited (Backward Citations)
US2828609A
Cited
US3067582A
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US3630024A
Cited
US3684186A
Cited
US3705492A
Cited
US3736747A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |