US3907488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of burning fuels by means of a burner
Assignee: Mitsubishi Heavy Industries Ltd
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Filing: 1974-02-14
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Granted: 1975-09-23
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Expires: 1994-02-14
Abstract
Abstract A method of burning a fuel by means of a burner which comprises premixing the fuel with air in an amount larger than the quantity theoretically required for the combustion of the fuel, allowing the resulting lean premixture to be issued from some of plural nozzles of the burner, while at the same time, premixing the fuel with air in an amount less than the theoretically required quantity, allowing the resulting rich premixture to be issued from the remaining nozzles, and burning the two gaseous premixtures together.
Inventors
- 👤 Yasuro Takahashi
- 👤 Yukihisa Fujima
- 👤 Hisao Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 19:13
CPC Classifications
F; F23; F23L; F23L7/00; F23C; F23C6/00; F23D; F23D11/00; F23D17/00; F23D17/002; F23D23/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
A method of burning a fuel by means of a burner which comprises premixing the fuel with air in an amount larger than the quantity theoretically required for the combustion of the fuel, allowing the resulting lean premixture to be issued from some of plural nozzles of the burner, while at the same time, premixing the fuel with air in an amount less than the theoretically required quantity, allowing the resulting rich premixture to be issued from the remaining nozzles, and burning the two gaseous premixtures together wherein the two gaseous premixtures are separately mixed with an inert liquid by spraying before they are issued from the respective burner nozzles for combustion.
Claim 2
Independent Claim
112 words
A method of burning a fuel by means of a burner which comprises premixing the fuel with air in an amount larger than the quantity theoretically required for the combustion of the fuel, allowing the resulting lean premixture to be issued from some of plural nozzles of the burner, while at the same time, premixing the fuel with air in an amount less than the theoretically required quantity, allowing the resulting rich premixture to be issued from the remaining nozzles, and burning the two gaseous premixtures together wherein the two gaseous premixtures are separately mixed with an inert liquid by spraying before they are issued from the respective burner nozzles for combustion.
Claim 3
Independent Claim
111 words
A method of burning a fuel by means of a burner which comprises premixing the fuel with air in an amount larger than the quantity theoretically required for the combustion of the fuel, allowing the resulting lean premixture to be issued from some of plural nozzles of the burner, while at the same time premixing the fuel with air in an amount less than the theoretically required quantity, allowing the resulting rich premixture to be issued from the remaining nozzles, and burning the two gaseous premixtures together wherein the two gaseous premixtures are separately mixed with a recycled combustion gas before they are issued from the respective burner nozzles for combustion.
Claim 4
Independent Claim
111 words
A method of burning a fuel by means of a burner which comprises premixing the fuel with air in an amount larger than the quantity theoretically required for the combustion of the fuel, allowing the resulting lean premixture to be issued from some of plural nozzles of the burner, while at the same time premixing the fuel with air in an amount less than the theoretically required quantity, allowing the resulting rich premixture to be issued from the remaining nozzles, and burning the two gaseous premixtures together wherein the two gaseous premixtures are separately mixed with a recycled combustion gas before they are issued from the respective burner nozzles for combustion.
Claim 5
Dependent Claim
51 words
A method of burning a fuel by means of a burner as defined in claim 2 wherein the lean premixture is formed to have an excess air rate from 1.3 to 1.6 and the rich premixture from 0.5 to 0.8 before they are issued from the respective burner nozzles for combustion.
Claim 6
Independent Claim
116 words
A method of burning a fuel by means of a burner which comprises premixing the fuel with air in an amount larger than the quantity theoretically required for the combustion of the fuel, allowing the resulting lean premixture to be issued from some of plural nozzles of the burner, while at the same time, premixing the fuel with air in an amount less than the theoretically required quantity, allowing the resulting rich premixture to be issued from the remaining nozzles, and burning the two gaseous premixtures together wherein the fuel is a gasified fuel prepared by thermally decomposing a heavy liquid fuel, adding an inert gas or liquid to the decomposed fuel, and cooling the mixture.
Claim 7
Independent Claim
116 words
A method of burning a fuel by means of a burner which comprises premixing the fuel with air in an amount larger than the quantity theoretically required for the combustion of the fuel, allowing the resulting lean premixture to be issued from some of plural nozzles of the burner, while at the same time, premixing the fuel with air in an amount less than the theoretically required quantity, allowing the resulting rich premixture to be issued from the remaining nozzles, and burning the two gaseous premixtures together wherein the fuel is a gasified fuel prepared by thermally decomposing a heavy liquid fuel, adding an inert gas or liquid to the decomposed fuel, and cooling the mixture.
Claim 8
Dependent Claim
100 words
A burner comprising gaseous or gasified fuel and air conduits, first premixing chambers for forming a fuel lean premixture consisting of the fuel and air in an amount larger than the quantity theoretically required for the combustion of the fuel, second premixing chambers for forming a fuel-rich premixture consisting of the fuel and air in an amount smaller than the theoretically required quantity, first nozzles for injecting the lean premixture, second nozzles for injecting the rich premixture, and conduits for an inert fluid means for discharging an inert fluid for mixing with the air to be used for the combustion.
Claim 9
Dependent Claim
100 words
A burner comprising gaseous or gasified fuel and air conduits, first premixing chambers for forming a fuel lean premixture consisting of the fuel and air in an amount larger than the quantity theoretically required for the combustion of the fuel, second premixing chambers for forming a fuel-rich premixture consisting of the fuel and air in an amount smaller than the theoretically required quantity, first nozzles for injecting the lean premixture, second nozzles for injecting the rich premixture, and conduits for an inert fluid means for discharging an inert fluid for mixing with the air to be used for the combustion.
Claim 10
Dependent Claim
17 words
A burner as defined in claim 5 further comprising heating means for gasifying a light liquid fuel.
Claim 11
Dependent Claim
104 words
A burner as defined in claim 5, further comprising a gasifying cylinder for converting heavy liquid fuel to a mixture of combustible gases, a premixer for auxiliary fuel, a screen burner for burning the auxiliary fuel, burners for spraying the heavy liquid fuel through the aid of steam, a burner cylinder formed with holes for supplying air to be mixed with a hot gas generated in the gasifying cylinder, means for cooling the hot gas formed in the gasifying cylinder by supplying and mixing therewith an inert fluid, air intake plates, gas passages defined by the air intake plates, and a starting oil burner.
Claim 12
Dependent Claim
38 words
A burner as defined in claim 7 wherein said means for cooling the resulting hot gas consists of a plurality of holes formed on the burner cylinder and conduit connected thereto through which the combustion gas is recycled.
Claim 13
Dependent Claim
31 words
A burner as defined in claim 7 wherein said means for cooling the resulting hot gas consists of a feed water pipe provided with water spraying nozzles inside the gasifying cylinder.
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) | 1978-09-22 | 1979-03-24 | 1979-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-22 | 1983-03-24 | 1983-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-22 | 1987-03-24 | 1987-09-23 | $7700.00 | Window Closed / Lapsed |