US4429644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed firing system
Assignee: Deutsche Babcock Anlagen AG
•
Filing: 1982-01-22
•
Granted: 1984-02-07
•
Expires: 2002-01-22
Abstract
Abstract A bottom of a combustion chamber of a fluidized bed firing system is penetrated by coal nozzles for introducing a coal/air mixture, and by air nozzles for injecting combustion air into the fluidized bed. A plate provided with openings is arranged in spaced relationship above each coal nozzle for achieving an improved burn-up.
Inventors
- 👤 Lothar Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 22:50
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1818; B01J8/1827; F; F23; F23C; F23C10/00; F23C10/18; F23C10/20; F23C10/22
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
132 words
Fluidized bed firing system comprising: a combustion chamber having a bottom; coal nozzles penetrating said bottom for introducing a coal/air mixture; air nozzles penetrating said bottom for injecting combustion air into the fluidized bed; a plate having openings and arranged within the fluidized bed in spaced relationship above each coal nozzle, said plates deflecting gas flow for destroying bubbles forming in the bottom of said fluidized bed and continuously enlarging after rising, so that fine particles are prevented from leaving the fluidized bed with the bubbles in unburnt condition and are held substantially long in said fluidized bed, said plate covering only a respective coal nozzle and air nozzle located in close adjacent vicinity, said plates being spaced from each other, the number of plates corresponding to the number of coal nozzles.
Claim 2
Dependent Claim
132 words
Fluidized bed firing system comprising: a combustion chamber having a bottom; coal nozzles penetrating said bottom for introducing a coal/air mixture; air nozzles penetrating said bottom for injecting combustion air into the fluidized bed; a plate having openings and arranged within the fluidized bed in spaced relationship above each coal nozzle, said plates deflecting gas flow for destroying bubbles forming in the bottom of said fluidized bed and continuously enlarging after rising, so that fine particles are prevented from leaving the fluidized bed with the bubbles in unburnt condition and are held substantially long in said fluidized bed, said plate covering only a respective coal nozzle and air nozzle located in close adjacent vicinity, said plates being spaced from each other, the number of plates corresponding to the number of coal nozzles.
Claim 3
Dependent Claim
16 words
Fluidized bed firing system according to claim 1, wherein said plate is supported on said bottom.
Claim 4
Dependent Claim
28 words
Fluidized bed firing system according to claim 1, including immersion type heating surfaces arranged within the fluidized bed; said plate being attached to said immersion type heating surfaces.
Claim 5
Dependent Claim
17 words
Fluidized bed firing system according to claim 1, wherein said plate is supported on said coal nozzles.
Claim 6
Dependent Claim
17 words
Fluidized bed firing system according to claim 1, including cooled support tubes for attachment of said plate.
Claim 7
Dependent Claim
23 words
Fluidized bed firing system according to claim 5, wherein said support tubes are connected to a coolant circuit of the combustion chamber bottom.
Claim 8
Dependent Claim
24 words
Fluidized bed firing system according to claim 5, wherein said support tubes are connected to a coolant circuit of said immersion type heating surfaces.
Claim 9
Dependent Claim
15 words
Fluidized bed firing system according to claim 1, wherein said plate comprises a perforated member.
Claim 10
Dependent Claim
14 words
Fluidized bed firing system according to claim 1, wherein said plate comprises a grating.
Claim 11
Dependent Claim
17 words
Fluidized bed firing system according to claim 1, wherein said plate is supported on said air nozzles.
Claim 12
Dependent Claim
64 words
A fluidized bed firing system according to claim 1, and said plate being supported on said bottom; immersion type heating surfaces arranged wihin said fluidized bed; said plate being attached to said immersion type heating surfaces; cooled support tubes for attachment to said plate; said support tubes being connected to a coolant circuit of the combustion chamber bottom; said plate comprising a perforated member.
References Cited (Backward Citations)
GB1084977A
Cited
US4287838A
Cited
US4336227A
Cited
US4356779A
Cited
US4312302A
Cited
US4377119A
Cited
US4309948A
Cited
US4363292A
Cited
US4357883A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |