US4589353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wood burning furnace
Assignee: Combustion Engineering Inc
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Filing: 1985-01-29
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Granted: 1986-05-20
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Expires: 2005-01-29
Abstract
Abstract A furnace (10) for burning cellulosic fuel has walls (64) which taper upwardly and outwardly, such that a given level or height (66) the cross-sectional flow area is 11/2 to 2 times the cross-sectional flow area near the bottom of the furnace. Thus the gas velocity continuously decreases, as the cross-sectional area increases. Any partially burned char particles initially entrained in the gases near the furnace bottom reach a height in the furnace where the gas velocity equals the particle terminal velocity, so that the particles remains suspended at this height until combustion as reduced their size enough so they can be carried on out of the furnace by the reduced gas velocity.
Inventors
- 👤 II Wesley P. Bauver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:54
CPC Classifications
F; F23; F23B; F23B1/00; F23B1/30; F23B1/16; F23B1/22; F23G; F23G7/00; F23G7/10; F23G7/105
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
163 words
In combination, a furnace having four walls for burning cellulosic fuel therein, a grate in the furnace bottom on which the fuel is burned, means for introducing cellulosic fuel onto the grate, means for introducing air into the furnace for supporting combustion of the fuel, a rear gas pass connected to the upper end of the furnace, the walls of the furnace being inclined upwardly and outwardly from the grate in such a manner that at a given height above the grate, the cross-sectional flow area is 11/2 to 2 times the flow area closely adjacent to the grate, such that most of the partially burned char particles entrained in the gases near the grate reach a height in the furnace where the gas velocity equals the particle terminal velocity, so that most of the particles remain suspended at this height until combustion has reduced their size enough so that they can be carried into the rear pass by the reduced gas velocity.
Claim 2
Dependent Claim
163 words
In combination, a furnace having four walls for burning cellulosic fuel therein, a grate in the furnace bottom on which the fuel is burned, means for introducing cellulosic fuel onto the grate, means for introducing air into the furnace for supporting combustion of the fuel, a rear gas pass connected to the upper end of the furnace, the walls of the furnace being inclined upwardly and outwardly from the grate in such a manner that at a given height above the grate, the cross-sectional flow area is 11/2 to 2 times the flow area closely adjacent to the grate, such that most of the partially burned char particles entrained in the gases near the grate reach a height in the furnace where the gas velocity equals the particle terminal velocity, so that most of the particles remain suspended at this height until combustion has reduced their size enough so that they can be carried into the rear pass by the reduced gas velocity.
References Cited (Backward Citations)
US2483728A
Cited
FR2098538A5
Cited
US3955512A
Cited
US4159000A
Cited
US4308806A
Cited
US4475472A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-05-19 | 1989-11-18 | 1990-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-19 | 1993-11-18 | 1994-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-05-19 | 1997-11-18 | 1998-05-20 | $7700.00 | Window Closed / Lapsed |