US5505146A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Burner pattern to minimize sidewall corrosion potential
Assignee: Babcock and Wilcox Power Generation Group Inc
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Filing: 1995-05-02
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Granted: 1996-04-09
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Expires: 2015-05-02
Abstract
Abstract A burner system for a furnace includes horizontal rows of cell burners some of which contain a secondary air port vertically spaced from a coal nozzle. The cell burners are in the front and rear walls of the furnace. Near the side walls of the furnace, which are connected between the front and rear walls, additional double-burner cells are provided which include a pair of vertically spaced coal nozzles or burners. Either a single lower row or a lower and upper row of cell burners include the double-burner cells at the side walls. The double cell burners are operated at 1.0 or higher throat stoichiometry. This reduces corrosion at the side walls while only slightly increasing NO x emission.
Inventors
- 👤 Thomas A. Laursen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 01:36
CPC Classifications
F; F23; F23C; F23C5/00; F23C5/08
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
159 words
A burner system for a furnace having spaced apart front and rear walls connected between spaced apart side walls, the system comprising: a plurality of cell burners lying along at least one horizontal row in at least one of the front and rear walls, each cell comprising a coal nozzle for projecting a primary air plus coal mixture into the furnace, and a secondary air port spaced vertically from the coal nozzle for supplying secondary air into the furnace at a vertically spaced yet adjacent location to the primary air plus coal mixture supplied to the furnace; means for supplying primary air and coal to the coal nozzles; means for supplying secondary air to the secondary air ports; and a double-burner cell in each of the front and rear walls and adjacent each of the side walls, each double-burner cell including a pair of spaced apart coal nozzles for projecting a primary air plus coal mixture into the furnace.
Claim 2
Dependent Claim
159 words
A burner system for a furnace having spaced apart front and rear walls connected between spaced apart side walls, the system comprising: a plurality of cell burners lying along at least one horizontal row in at least one of the front and rear walls, each cell comprising a coal nozzle for projecting a primary air plus coal mixture into the furnace, and a secondary air port spaced vertically from the coal nozzle for supplying secondary air into the furnace at a vertically spaced yet adjacent location to the primary air plus coal mixture supplied to the furnace; means for supplying primary air and coal to the coal nozzles; means for supplying secondary air to the secondary air ports; and a double-burner cell in each of the front and rear walls and adjacent each of the side walls, each double-burner cell including a pair of spaced apart coal nozzles for projecting a primary air plus coal mixture into the furnace.
Claim 3
Dependent Claim
27 words
A system according to claim 1, wherein at least some of the coal nozzles in at least some of the double-burner cells comprise single air zone burners.
Claim 4
Dependent Claim
30 words
A system according to claim 1, wherein at least some of the coal nozzles in at least some of the double-burner cells comprise dual air zone low NO x burners.
Claim 5
Dependent Claim
26 words
A system according to claim 1, wherein the coal nozzles of the double-burner cells include means for operation at a throat stoichiometry of 1.0 or greater.
Claim 6
Dependent Claim
49 words
A system according to claim 1, wherein at least some of the cell burners are non-inverted cell burners with the secondary air port spaced above the coal nozzle, and at least some of the cell burners are inverted cell burners with the secondary air port below the coal nozzle.
Claim 7
Dependent Claim
31 words
A system according to claim 1, including at least two vertically spaced rows each containing a plurality of cell burners with the double-burner cells being at least in the lower row.
Claim 8
Dependent Claim
30 words
A system according to claim 6, including double-burner cells in each of the at least two rows, and in the front and rear walls adjacent each of the side walls.
Claim 9
Dependent Claim
40 words
A system according to claim 1, including means for supplying from 7% to 20% a total amount of fuel for the furnace to the double-burner cells, the double-burner cells being operated at a throat stoichiometry which is greater than 1.0.
Claim 10
Dependent Claim
23 words
A system according to claim 1, including from 40 to 56 cell burners and from 4 to 8 double-burner cells in the furnace.
Claim 11
Dependent Claim
161 words
A burner system for a furnace having spaced apart front and rear walls connected between spaced apart side walls, the system comprising: a plurality of cell burners lying along at least one horizontal row in at least one of the front and rear walls, each cell comprising a coal nozzle for projecting a primary air plus coal mixture into the furnace, and a secondary air port spaced vertically from the coal nozzle for supplying secondary air into the furnace at a vertically spaced yet adjacent location to the primary air plus coal mixture supplied to the furnace; means for supplying primary air and coal to the coal nozzles; means for supplying secondary air to the secondary air ports; and a double-burner cell in at least one of the front and rear walls and adjacent each of the side walls, each double-burner cell including a pair of spaced apart coal nozzles for projecting a primary air plus coal mixture into the furnace.
Claim 12
Dependent Claim
161 words
A burner system for a furnace having spaced apart front and rear walls connected between spaced apart side walls, the system comprising: a plurality of cell burners lying along at least one horizontal row in at least one of the front and rear walls, each cell comprising a coal nozzle for projecting a primary air plus coal mixture into the furnace, and a secondary air port spaced vertically from the coal nozzle for supplying secondary air into the furnace at a vertically spaced yet adjacent location to the primary air plus coal mixture supplied to the furnace; means for supplying primary air and coal to the coal nozzles; means for supplying secondary air to the secondary air ports; and a double-burner cell in at least one of the front and rear walls and adjacent each of the side walls, each double-burner cell including a pair of spaced apart coal nozzles for projecting a primary air plus coal mixture into the furnace.
Claim 13
Dependent Claim
27 words
A system according to claim 10, wherein at least some of the coal nozzles in at least some of the double-burner cells comprise single air zone burners.
Claim 14
Dependent Claim
30 words
A system according to claim 10, wherein at least some of the coal nozzles in at least some of the double-burner cells comprise dual air zone low NO x burners.
Claim 15
Dependent Claim
26 words
A system according to claim 10, wherein the coal nozzles of the double-burner cells include means for operation at a throat stoichiometry of 1.0 or greater.
Claim 16
Dependent Claim
49 words
A system according to claim 10, wherein at least some of the cell burners are non-inverted cell burners with the secondary air port spaced above the coal nozzle, and at least some of the cell burners are inverted cell burners with the secondary air port below the coal nozzle.
Claim 17
Dependent Claim
31 words
A system according to claim 10, including at least two vertically spaced rows each containing a plurality of cell burners with the double-burner cells being at least in the lower row.
Claim 18
Dependent Claim
30 words
A system according to claim 15, including double-burner cells in each of the at least two rows, and in the front and rear walls adjacent each of the side walls.
Claim 19
Dependent Claim
40 words
A system according to claim 10, including means for supplying from 7% to 20% a total amount of fuel for the furnace to the double-burner cells, the double-burner cells being operated at a throat stoichiometry which is greater than 1.0.
Claim 20
Dependent Claim
23 words
A system according to claim 10, including from 40 to 56 cell burners and from 4 to 8 double-burner cells in the furnace.
References Cited (Backward Citations)
US5205226A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-04-09 | 1999-10-09 | 2000-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-04-09 | 2003-10-09 | 2004-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-04-09 | 2007-10-09 | 2008-04-09 | $7700.00 | Window Closed / Lapsed |