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US4790267A
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Arrangement for burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator
Assignee: Deutsche Babcock Werke AG
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Filing: 1987-12-22
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Granted: 1988-12-13
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Expires: 2007-12-22
Abstract
Abstract A steam generator and a method of burning fuels therein. A combustion chamber of gas-tight pipe walls has a fluidized bed. Above the bed is a free space with an incrementally lower solids density that accommodates heat-convection surfaces. Coarse-particle precipitators communicate with the top of the combustion chamber with their solids-extraction outlet communicating with the fluidized bed through a feedback system. The combustion chamber, its heat-convection surfaces, the coarse-particle precipitators, and the feedback system are surrounded by pressurized vessel. The fuel is burned in the fluidized bed under pressure. Densities of 0.5 to 5 kg of solids per kg of flue gas are maintained in the free space (4) above the bed by means of fluidizing rates of 1 to 5 m/sec. The temperature of and load on the fluidized bed are regulated by the amount of solids returned to the bed.
Inventors
- 👤 Horst Mollenhoff
- 👤 Heiko Rehwinkel
- 👤 Dirk Bunthoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:29
CPC Classifications
F; F22; F22B; F22B31/00; F22B31/0007; F22B31/0084
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
127 words
A method of burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising the steps: cooling flue gases to 300° C. to 500° C. and cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber; returning at least a part of resulting solids to the fluidized bed; burning fuel in the fluidized bed under pressure; maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rate of 1 to 5 m/sec; and regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed.
Claim 2
Independent Claim
127 words
A method of burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising the steps: cooling flue gases to 300° C. to 500° C. and cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber; returning at least a part of resulting solids to the fluidized bed; burning fuel in the fluidized bed under pressure; maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rate of 1 to 5 m/sec; and regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed.
Claim 3
Independent Claim
164 words
A method of burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising the steps: cooling flue gases to 300° C. to 500° C. and cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber; returning at least a part of resulting solids to the fluidized bed; burning fuel in the fluidized bed under pressure; maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rates of 1 to 5 m/sec; regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed; providing said precipitators with solids-extraction outlets communicating with said fluidized bed through feedback means, said free space having heat-convection surfaces; and surrounding said combustion chamber, said heat-convection surfaces, said precipitators, and said feedback means by a pressurized vessel.
Claim 4
Independent Claim
164 words
A method of burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising the steps: cooling flue gases to 300° C. to 500° C. and cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber; returning at least a part of resulting solids to the fluidized bed; burning fuel in the fluidized bed under pressure; maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rates of 1 to 5 m/sec; regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed; providing said precipitators with solids-extraction outlets communicating with said fluidized bed through feedback means, said free space having heat-convection surfaces; and surrounding said combustion chamber, said heat-convection surfaces, said precipitators, and said feedback means by a pressurized vessel.
Claim 5
Dependent Claim
135 words
An arrangement for burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising: means for cooling flue gases to 300° C. to 500° C. and means for cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber; returning at least a part of resulting solids to the fluidized bed; means for burning fuel in the fluidized bed under pressure; means for maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rates of 1 to 5 m/sec; and means for regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed.
Claim 6
Dependent Claim
135 words
An arrangement for burning fuels in a fluidized bed with an augmented solids circulation in a combustion chamber of a steam generator, comprising: means for cooling flue gases to 300° C. to 500° C. and means for cleaning preliminarily said flue gases in coarse-particle precipitators communicating with said combustion chamber at a top portion of said combustion chamber; returning at least a part of resulting solids to the fluidized bed; means for burning fuel in the fluidized bed under pressure; means for maintaining densities of 0.5 to 5 kg of solids per kg of flue gas in a free space above said fluidized bed by fluidizing rates of 1 to 5 m/sec; and means for regulating the temperature of said bed and load on said bed by amount of solids returned to the fluidized bed.
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) | 1991-12-13 | 1992-06-13 | 1992-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-12-13 | 1996-06-13 | 1996-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-12-13 | 2000-06-13 | 2000-12-13 | $7700.00 | Window Closed / Lapsed |