US4013399A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reduction of gaseous pollutants in combustion flue gas
Assignee: Aqua Chem Inc
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Filing: 1975-10-09
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Granted: 1977-03-22
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Expires: 1995-10-09
Abstract
Abstract Fuel is burned in a primary combustion chamber with less than the air required for stoichiometric combustion so that the combustion gases have a high carbon monoxide (CO) and hydrocarbon content and the temperature of the gases is held below that at which significant nitrogen oxides (NO x ) would be produced. The combustion gases are then passed through a secondary combustion zone in which more air is injected into the gas stream to oxidize the CO and hydrocarbons to carbon dioxide (CO.sub. 2). The secondary burner comprises a plurality of foraminous tubes through which secondary air is emitted. Combustion in the secondary zone is maintained at a temperature below that at which nitrogen oxides (NO x ) will be produced in significant quantities.
Inventors
- 👤 Glenn D. Craig
- 👤 David T. Feuling
- 👤 Paul G. LeHaye
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:24
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/8621; B01D53/8625; B01D53/8631; F; F23; F23C; F23C6/00; F23C6/04; F23B; F23B2700/00; F23B2700/018
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
100 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream within a combustion zone of a fuel burning device, said apparatus comprising: a plurality of elongate, hollow tubular means, means supporting said tubular means in a position generally transverse to and extending across said combustion zone, said tubular means being spaced apart in a direction generally transverse to the flow direction of said combustion product stream for causing said stream to flow into the gaps therebetween, and a plurality of gas discharge openings formed in each of said tubular means for injecting combustion supporting gases into said stream.
Claim 2
Dependent Claim
100 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream within a combustion zone of a fuel burning device, said apparatus comprising: a plurality of elongate, hollow tubular means, means supporting said tubular means in a position generally transverse to and extending across said combustion zone, said tubular means being spaced apart in a direction generally transverse to the flow direction of said combustion product stream for causing said stream to flow into the gaps therebetween, and a plurality of gas discharge openings formed in each of said tubular means for injecting combustion supporting gases into said stream.
Claim 3
Dependent Claim
17 words
The apparatus set forth in claim 1 wherein said tubular means are arranged generally in a row.
Claim 4
Dependent Claim
18 words
The apparatus set forth in claim 2 wherein said tubular means are arranged generally parallel to each other.
Claim 5
Dependent Claim
33 words
The apparatus set forth in claim 3 wherein the gaps between adjacent tubular means in said row are generally equal and the discharge openings are on the downstream sides of said tubular means.
Claim 6
Dependent Claim
69 words
The apparatus set forth in claim 1 wherein: a. said tubular means are arranged in rows which extend substantially transversely to the general direction of flow of said gaseous combustion products, the rows being displaced from each other in the general flow direction of the gaseous combustion products and the tubular means in each row being disposed in the path of flow between the tubular means in another row.
Claim 7
Dependent Claim
41 words
The apparatus set forth in claim 1 wherein said tubular means are arranged in rows, the rows extending substantially transversely of the general flow direction of said gaseous combustion products and the rows being displaced from each other along said direction.
Claim 8
Dependent Claim
23 words
The apparatus set forth in claim 1 wherein: a. said gas discharge openings are disposed longitudinally and spaced transversely of said tubular means.
Claim 9
Dependent Claim
26 words
The apparatus set forth in claim 7 wherein: a. said tubular means are positioned in said gaseous combustion product stream with said openings directed substantially downstream.
Claim 10
Dependent Claim
35 words
The invention set forth in claim 1 including: a. header means adapted for being supplied with combustion supporting gas, b. said plurality of tubular means being coupled with said header means for receiving gas therefrom.
Claim 11
Dependent Claim
58 words
The invention set forth in claim 1 wherein: a. said plurality of tubular means are arranged in groups, first and second header means adapted for being supplied with combustion supporting gas, the tubular means in one group being coupled with said first header means and the tubular means in another group being coupled with said second header means.
Claim 12
Dependent Claim
38 words
The invention set forth in claim 1 including: a. frame means having an opening in which said plurality of said tubular means are disposed, said frame means constraining said gaseous combustion products to flow about said tubular means.
Claim 13
Dependent Claim
108 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream of a fuel burning device, said apparatus comprising: a. a first plurality of hollow means each having a plurality of openings for dispersing said gas into said stream, b. a second plurality of hollow means each disposed adjacent one of said first hollow means and defining therewith a space for conducting coolant in heat exchange relationship with said first hollow means, c. isolating means for isolating said openings from said space, and d. means for supporting said first plurality of hollow means transversely of the flow path of said stream and in a spaced apart relation.
Claim 14
Dependent Claim
108 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream of a fuel burning device, said apparatus comprising: a. a first plurality of hollow means each having a plurality of openings for dispersing said gas into said stream, b. a second plurality of hollow means each disposed adjacent one of said first hollow means and defining therewith a space for conducting coolant in heat exchange relationship with said first hollow means, c. isolating means for isolating said openings from said space, and d. means for supporting said first plurality of hollow means transversely of the flow path of said stream and in a spaced apart relation.
Claim 15
Dependent Claim
56 words
The apparatus set forth in claim 12 wherein: a. said second hollow means comprise tubular means embracing its associated first hollow means and having an opening formed therein, said isolating means extending between the openings in the first hollow means and the tubular means to provide a gas passageway from the hollow means to said stream.
Claim 16
Dependent Claim
27 words
The apparatus set forth in claim 12 wherein: a. said isolating means comprises nozzle means projecting from said first hollow means for dispersing said combustion supporting gas.
Claim 17
Dependent Claim
51 words
The apparatus set forth in claim 14 wherein: a. said first hollow means comprise first elongated tubular means having said plurality of nozzle means projecting therefrom, b. said second hollow means comprising second tubular means surrounding said first tubular means and said nozzle means projecting sealingly through said second tubular means.
Claim 18
Dependent Claim
19 words
The apparatus set forth in claim 15 wherein: a. the exit ends of said nozzle means are directed downstream.
Claim 19
Dependent Claim
30 words
The apparatus set forth in claim 12 including: a. header means adapted for being supplied with combustion supporting gas, b. said first hollow means being coupled with said header means.
Claim 20
Dependent Claim
58 words
The apparatus set forth in claim 12: a. including first header means adapted for being supplied with said combustion supporting gas, and b. second header means adapted to be supplied with fluid coolant, c. said first hollow means being coupled with said first header means and said second hollow means being coupled independently to said second header means.
Claim 21
Dependent Claim
98 words
The apparatus set forth in claim 12 wherein: a. said first hollow means comprises first tubular means, b. said second hollow means comprises second tubular means surrounding said first tubular means, c. coolant inlet and outlet header means in substantially the same plane as said second hollow means and opposite ends thereof being coupled, respectively, with said inlet and outlet header means, d. gas header means for conducting combustion supporting gas, said first hollow means extending sealingly through one of said inlet or outlet header means and said first hollow means being coupled with said gas header means.
Claim 22
Dependent Claim
105 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream of a fuel burning device, said apparatus comprising: a. hollow means adapted to receive combustion supporting gas interiorly thereof, said hollow means having a plurality of openings for conducting the gas to the exterior thereof, b. said hollow means being positioned in said gaseous combustion product stream with said openings directed substantially downstream, at least a part of said hollow means being arcuate in cross section and said openings are at an angle of about 120° from each other in said arcuate part and substantially on the downstream side of said hollow means.
Claim 23
Dependent Claim
105 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream of a fuel burning device, said apparatus comprising: a. hollow means adapted to receive combustion supporting gas interiorly thereof, said hollow means having a plurality of openings for conducting the gas to the exterior thereof, b. said hollow means being positioned in said gaseous combustion product stream with said openings directed substantially downstream, at least a part of said hollow means being arcuate in cross section and said openings are at an angle of about 120° from each other in said arcuate part and substantially on the downstream side of said hollow means.
Claim 24
Dependent Claim
73 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream of a fuel burning device, said apparatus comprising: a. hollow combustion supporting gas supply means having first and second groups of nozzle means projecting therefrom for dispersing said gas into said stream, and diverging from each other at about 120°, b. means associated with said hollow means defining a space for conducting coolant in heat exchange relationship with said hollow means.
Claim 25
Dependent Claim
73 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream of a fuel burning device, said apparatus comprising: a. hollow combustion supporting gas supply means having first and second groups of nozzle means projecting therefrom for dispersing said gas into said stream, and diverging from each other at about 120°, b. means associated with said hollow means defining a space for conducting coolant in heat exchange relationship with said hollow means.
Claim 26
Dependent Claim
30 words
The apparatus set forth in claim 21 wherein: a. said diverging nozzle means are directed generally downstream and are equiangularly displaced from a plane directed substantially in the downstream direction.
Claim 27
Dependent Claim
117 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream within a combustion zone of a fuel burning device, said apparatus comprising: a plurality of elongate, hollow tubular means, means for supporting said tubular means in a position generally transversely to and across said combustion zone, said tubular means being spaced apart in a direction generally transverse to the flow direction of said combustion product stream for causing said stream to divide into separate flow paths in the gaps between said tubular means, and a plurality of gas discharge openings formed in the downstream side of each of said tubular means for injecting combustion supporting gases into spaced apart portions of said separate flow paths.
Claim 28
Dependent Claim
117 words
Apparatus for dispersing combustion supporting gas into the gaseous combustion product stream within a combustion zone of a fuel burning device, said apparatus comprising: a plurality of elongate, hollow tubular means, means for supporting said tubular means in a position generally transversely to and across said combustion zone, said tubular means being spaced apart in a direction generally transverse to the flow direction of said combustion product stream for causing said stream to divide into separate flow paths in the gaps between said tubular means, and a plurality of gas discharge openings formed in the downstream side of each of said tubular means for injecting combustion supporting gases into spaced apart portions of said separate flow paths.
Claim 29
Dependent Claim
35 words
The apparatus set forth in claim 23 wherein said openings in each tubular means are arranged in longitudinal rows on the downstream side thereof and arranged symmetrically relative to the flow direction of said stream.
Claim 30
Dependent Claim
55 words
The apparatus set forth in claim 24 wherein there are a pair of elongate flute means extending axially from the downstream sides of said tubular means, said flute means being arranged symmetrically relative to the flow direction of said combustion products, one of said rows of openings being disposed in each of said flute means.
Claim 31
Dependent Claim
45 words
The apparatus set forth in claim 25 wherein said tubular means are arranged in at least a pair of rows oriented across said combustion zone, the tubular means of each row being in alignment with the gaps between the tubular means of an adjacent row.
Claim 32
Dependent Claim
27 words
The apparatus set forth in claim 25 wherein a cooling jacket means surrounds each of said tubular means, said flute means extending through said cooling jacket means.
Claim 33
Dependent Claim
30 words
The apparatus set forth in claim 27 wherein said flute means are arranged parallel to the axis of said tubular means and spaced at a central angle of approximately 120°.
Claim 34
Dependent Claim
45 words
The apparatus set forth in claim 28 wherein said tubular means are arranged in at least a pair of rows oriented across said combustion zone, the tubular means of each row being in alignment with the gaps between the tubular means of an adjacent row.
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) | 1980-03-21 | 1980-09-20 | 1981-03-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-03-21 | 1984-09-20 | 1985-03-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-03-21 | 1988-09-20 | 1989-03-22 | $7700.00 | Window Closed / Lapsed |