US4095928A
Expired / Lapsed
US
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Method of reducing nitrogen oxide emissions in flue gas
Assignee: Southern California Edison Co
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Filing: 1977-02-14
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Granted: 1978-06-20
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Expires: 1997-02-14
Abstract
Abstract A process for the simultaneous combustion of nitrogen-rich fuels and nitrogen-poor fuels which results in the production of less nitrogen oxide emissions.
Inventors
- 👤 Dale A. Jones
- 👤 Mansour N. Mansour
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:54
CPC Classifications
F; F23; F23C; F23C1/00; F23C6/00; F23C2900/00; F23C2900/99004
Claims Analysis
Total Claims: 33
Claim 1
Independent Claim
57 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone nitrogen-rich fuels; burning in a second combustion zone nitrogen-poor fuels; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen rich fuels to pass through said second combustion zone.
Claim 2
Independent Claim
57 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone nitrogen-rich fuels; burning in a second combustion zone nitrogen-poor fuels; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen rich fuels to pass through said second combustion zone.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein said nitrogen-rich fuels have a nitrogen content of about 1.0% to about 2.5% by weight.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said nitrogen-poor fuels have a nitrogen content of about 0 to about 0.6% by weight.
Claim 5
Dependent Claim
51 words
The method of claim 1 wherein said nitrogen-rich fuel is selected from the group consisting of crude oil, solvent refined coal, liquefication residues, synthetic oil from coal, synthetic oil from oil shale, synthetic oil from tar sands, coal-oil slurry, petroleum coke-oil slurry, asphaltene, pulverized petroleum coke, residual oil and raw coal.
Claim 6
Dependent Claim
68 words
The method of claim 1 wherein said nitrogen-poor fuel is selected from the group consisting of number two petroleum distillate, crude oil, refined light distillate liquid fuel from coal and oil shale, low sulfur oil, denitrified synthetic fuels, natural gas, synthetic natural gas from coal gasification and low and medium BTU gas from gasification of coal, petroleum coke and oil slurries thereof, tar sands and coal liquefication residue.
Claim 7
Independent Claim
63 words
A method of reducing nitrogen oxide emissions from fuel burning comprising: burning a nitrogen-rich fuel in a first burner means; burning simultaneously a nitrogen-poor fuel in a second burner means, said second burner means being positioned above said first burner means so that the combustion gases from the burning of said nitrogen-rich fuel pass through the combustion zone of said second burner means.
Claim 8
Independent Claim
63 words
A method of reducing nitrogen oxide emissions from fuel burning comprising: burning a nitrogen-rich fuel in a first burner means; burning simultaneously a nitrogen-poor fuel in a second burner means, said second burner means being positioned above said first burner means so that the combustion gases from the burning of said nitrogen-rich fuel pass through the combustion zone of said second burner means.
Claim 9
Independent Claim
64 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone nitrogen-rich fuels in a fuel-rich manner; burning in a second combustion zone nitrogen-poor fuels in an air-rich manner; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 10
Independent Claim
64 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone nitrogen-rich fuels in a fuel-rich manner; burning in a second combustion zone nitrogen-poor fuels in an air-rich manner; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 11
Dependent Claim
34 words
The method of claim 7 wherein said nitrogen-rich fuels are burned in an atmosphere having about 80% to about 105% of the theoretical amount of air needed to enable complete combustion of the fuel.
Claim 12
Dependent Claim
31 words
The method of claim 7 wherein said nitrogen-rich fuels are burned in an atmosphere containing about 90% of the theoretical amount of air needed to enable complete combustion of the fuel.
Claim 13
Dependent Claim
34 words
The method of claim 7 wherein said nitrogen-poor fuels are burned in an atmosphere containing about 120 to about 150% of the theoretical amount of air needed to enable complete combustion of the fuel.
Claim 14
Dependent Claim
21 words
The method of claim 7 wherein said nitrogen-rich fuels have a nitrogen content of about 1.0 to about 2.5% by weight.
Claim 15
Dependent Claim
21 words
The method of claim 7 wherein said nitrogen-poor fuels have a nitrogen content of about 0 to about 0.15% by weight.
Claim 16
Dependent Claim
52 words
The method of claim 11 wherein said nitrogen-rich fuel is selected from the group consisting of crude oil, solvent refined coal, liquefication residues, synthetic oil from coal, synthetic oil from oil shale, synthetic oil from tar sands, coal-oil slurry, petroleum coke-oil slurry, asphaltene, pulverized petroleum coke, residual oil and pulverized raw coal.
Claim 17
Dependent Claim
46 words
The method of claim 12 wherein said nitrogen-poor fuel is selected from the group consisting of natural gas, synthetic natural gas from coal gasification and low and medium BTU gas from gasification of coal, petroleum coke and oil slurries thereof, tar sands and coal liquefication residues.
Claim 18
Independent Claim
133 words
A method of reducing nitrogen oxide emissions from fuel burning comprising: burning a nitrogen-rich fuel having a nitrogen content of about 1.0 to about 2.5% by weight in a first burner means in an atmosphere containing about 80 to about 105% of the theoretical amount of air needed to enable complete combustion of the fuel; burning simultaneously a nitrogen-poor fuel having a nitrogen content of about 0 to about 0.15% by weight in a second burner means in an atmosphere containing 120 to about 150% of the theoretical amount of air needed to enable complete combustion of the fuel, said second burner means being positioned directly above said first burner means so that the combustion gases from the burning of said nitrogen-rich fuel pass through the combustion zone of said second burner means.
Claim 19
Independent Claim
133 words
A method of reducing nitrogen oxide emissions from fuel burning comprising: burning a nitrogen-rich fuel having a nitrogen content of about 1.0 to about 2.5% by weight in a first burner means in an atmosphere containing about 80 to about 105% of the theoretical amount of air needed to enable complete combustion of the fuel; burning simultaneously a nitrogen-poor fuel having a nitrogen content of about 0 to about 0.15% by weight in a second burner means in an atmosphere containing 120 to about 150% of the theoretical amount of air needed to enable complete combustion of the fuel, said second burner means being positioned directly above said first burner means so that the combustion gases from the burning of said nitrogen-rich fuel pass through the combustion zone of said second burner means.
Claim 20
Independent Claim
64 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising; burning in a first combustion zone nitrogen-rich fuels in a stoichiometric manner; burning in a second combustion zone nitrogen-poor fuels in a stoichiometric manner; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 21
Independent Claim
64 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising; burning in a first combustion zone nitrogen-rich fuels in a stoichiometric manner; burning in a second combustion zone nitrogen-poor fuels in a stoichiometric manner; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 22
Dependent Claim
21 words
The method of claim 17 wherein said nitrogen-rich fuels have a nitrogen content of about 1.0 to about 2.5% by weight.
Claim 23
Dependent Claim
21 words
The method of claim 16 wherein said nitrogen-poor fuels have a nitrogen content of about 0 to about 0.6% by weight.
Claim 24
Dependent Claim
53 words
The method of claim 17 wherein said nitrogen-rich fuel is selected from the group consisting of crude oil, solvent refined coal, liquefication residues, synthetic oil from coal, synthetic oil from oil shale, synthetic oil from tar sands, coal-oil slurry and petroleum coke-oil slurry, asphaltene, pulverized petroleum coke, residual oil and pulverized raw coal.
Claim 25
Dependent Claim
68 words
The method of claim 18 wherein said nitrogen-poor fuel is selected from the group consisting of number two petroleum distillate, crude oil, refined light distillate liquid fuel from coal and oil shale, low sulfur oil denitrified synthetic fuels, natural gas, synthetic natural gas from coal gasification and low and medium BTU gas from gasification of coal, petroleum coke and oil slurries thereof, tar sands and coal liquefication residue.
Claim 26
Independent Claim
94 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone of a furnace nitrogen-rich fuels in a fuel-rich manner; burning in a second combustion zone of a furnace nitrogen-poor fuels in a fuel-rich manner; introducing air into said furnace between said first and said second combustion zone to enable complete combustion of said nitrogen-rich and nitrogen poor fuels; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 27
Independent Claim
94 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone of a furnace nitrogen-rich fuels in a fuel-rich manner; burning in a second combustion zone of a furnace nitrogen-poor fuels in a fuel-rich manner; introducing air into said furnace between said first and said second combustion zone to enable complete combustion of said nitrogen-rich and nitrogen poor fuels; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 28
Dependent Claim
21 words
The method of claim 21 wherein said nitrogen-rich fuels have a nitrogen content of about 1.0 to about 2.5% by weight.
Claim 29
Dependent Claim
21 words
The method of claim 21 wherein sai nitrogen-poor fuels have a nitrogen content of about 0 to about 0.6% by weight.
Claim 30
Independent Claim
93 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone of a furnace nitrogen-rich fuels in a fuel-rich manner; burning in a second combustion zone of a furnace nitrogen-poor fuels in a stoichiometric manner; introducing air into said furnace between said first and said second combustion zone to enable complete combustion of said nitrogen-rich and nitrogen-poor fuels; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 31
Independent Claim
93 words
A method of reducing nitrogen oxide emissions from fuel burning, comprising: burning in a first combustion zone of a furnace nitrogen-rich fuels in a fuel-rich manner; burning in a second combustion zone of a furnace nitrogen-poor fuels in a stoichiometric manner; introducing air into said furnace between said first and said second combustion zone to enable complete combustion of said nitrogen-rich and nitrogen-poor fuels; and burning both said fuels simultaneously and in a manner to cause the combustion gases from the burning of said nitrogen-rich fuels to pass through said second combustion zone.
Claim 32
Dependent Claim
21 words
The method of claim 24 wherein said nitrogen-rich fuels have a nitrogen content of about 1.0 to about 2.5% by weight.
Claim 33
Dependent Claim
21 words
The method of claim 24 wherein said nitrogen-poor fuels have a nitrogen content of about 0 to about 0.6% by weight.
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |