US4434727A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for low load operation of a coal-fired furnace
Assignee: Combustion Engineering Inc
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Filing: 1983-06-13
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Granted: 1984-03-06
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Expires: 2003-06-13
Abstract
Abstract When a pulverized coal-fired furnace is operating at low loads, the primary air and pulverized coal stream discharging from the coal delivery pipe is split into a first and a second coal-air stream and independently directed into the furnace by tilting at least one of the streams away from the other, thereby establishing an ignition stabilizing pocket in the locally low pressure zone created between the spread apart coal-air streams.
Inventors
- 👤 Michael S. McCartney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 19:56
CPC Classifications
F; F23; F23C; F23C5/00; F23C5/02; F23C5/06; F23C7/00; F23C7/02; F23D; F23D1/00; F23D2201/00; F23D2201/10; F23D2201/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
152 words
In a pulverized coal-fired furnace equipped with a plurality of individual burners wherein each of the burners provide a passageway through which a mixture of pulverized coal and primary air passes into the furnace, a method of operating at least one of said burners, comprising: a. during operation of the furnace at normal loads, discharging the mixture of pulverized coal and primary air passing through said burner into the furnace as a single stream coal-air stream; b. during operation of the furnace at low loads, splitting the mixture of pulverized coal and primary air discharging from said burner into a first and second coal-air substream; c. turning at least one of said substreams away from the other so as to extablish a divergent angular relationship between said first and second coal-air substreams; and d. directing said first and second coal-air substreams into the furnace in said divergent angular relationship to each other.
Claim 2
Dependent Claim
152 words
In a pulverized coal-fired furnace equipped with a plurality of individual burners wherein each of the burners provide a passageway through which a mixture of pulverized coal and primary air passes into the furnace, a method of operating at least one of said burners, comprising: a. during operation of the furnace at normal loads, discharging the mixture of pulverized coal and primary air passing through said burner into the furnace as a single stream coal-air stream; b. during operation of the furnace at low loads, splitting the mixture of pulverized coal and primary air discharging from said burner into a first and second coal-air substream; c. turning at least one of said substreams away from the other so as to extablish a divergent angular relationship between said first and second coal-air substreams; and d. directing said first and second coal-air substreams into the furnace in said divergent angular relationship to each other.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-03-06 | 1987-09-05 | 1988-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-03-06 | 1991-09-05 | 1992-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-03-06 | 1995-09-05 | 1996-03-06 | $7700.00 | Window Closed / Lapsed |