US3696793A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Steam boilers
Assignee: Foster Wheeler Inc
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Filing: 1970-09-23
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Granted: 1972-10-10
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Expires: 1990-09-23
Abstract
Abstract This invention relates to steam boilers fired by fluidized bed burners. A small proportion of bed particles are entrained by the fluidizing gases and so these must be removed by separators so as to ensure that these particles do not form deposits on downstream parts of the boiler. According to the invention a number of centrifugal separators are provided above the bed in the path of the fluidizing gas, those separators being supported and cooled by steam- or water-carrying tubes. Because effective cooling of the separators can be achieved, this arrangement has the advantage that they can be positioned closely above the bed.
Inventors
- 👤 Alan Bell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:44
CPC Classifications
F; F22; F22B; F22B31/00; F22B31/0007; F22B31/0015; F22B31/0023; F23; F23C; F23C10/00; F23C10/18; F23J; F23J15/00; F23J15/02; F23J15/022; F23J15/027
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
113 words
In a fluidized bed steam boiler of the type having a fluidizable bed of combustible particles, means for supplying air to fluidize said particles whereby combustion of said combustible particles occurs and means for supplying fresh combustible particle to the bed and withdrawing spent combustible particles, in combination, a plurality of separators provided downstream of said bed of combustible particles, an inclined plate, said separators projecting through said plate, and fluid carrying cooling tubes adapted to be cooled by fluid which has absorbed heat created by the combustion of said combustible particles for the production of steam, said plate being supported by and in heat exchange contact with said fluid carrying cooling tubes.
Claim 2
Dependent Claim
113 words
In a fluidized bed steam boiler of the type having a fluidizable bed of combustible particles, means for supplying air to fluidize said particles whereby combustion of said combustible particles occurs and means for supplying fresh combustible particle to the bed and withdrawing spent combustible particles, in combination, a plurality of separators provided downstream of said bed of combustible particles, an inclined plate, said separators projecting through said plate, and fluid carrying cooling tubes adapted to be cooled by fluid which has absorbed heat created by the combustion of said combustible particles for the production of steam, said plate being supported by and in heat exchange contact with said fluid carrying cooling tubes.
Claim 3
Dependent Claim
30 words
The boiler defined in claim 1 in which some of said fluid carrying cooling tubes are adapted to carry fluid heated in tubes immersed in said bed of fluidized particles.
Claim 4
Dependent Claim
21 words
The boiler defined in claim 1 further comprising headers connected between said tubes immersed in said bed and said cooling tubes.
Claim 5
Dependent Claim
12 words
The boiler defined in claim 1 which said separators are centrifugal separators.
Claim 6
Dependent Claim
36 words
The boiler defined in claim 1 wherein said plates are of generally triangular shape and are each joined to two other of said plates at their edges to form an inverted pyramidal arrangement above said bed.
Claim 7
Dependent Claim
39 words
The boiler defined in claim 5 further comprising a particle outlet at the center of said inverted pyramidal arrangement, said separators being situated so that separated particles fall onto said plates and slide by gravity to said particle outlet.
Claim 8
Dependent Claim
94 words
The boiler defined in claim 1 wherein said separators comprise a cylindrical tube to direct gases therethrough, at least one swirler blade positioned in said tube adjacent the inlet thereof for imparting axial swirling motion to said gases passing through said tubes to thereby throw entrained particles outward and against said cylindrical wall of said tube, and an annular deflector adjacent said gas outlet end of said tube to deflect said particles thrown towards said cylindrical wall of said tube in a direction opposite to that said gases are moving and towards said plate.
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) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |