US4267801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Circulating fluidized bed boiler
Assignee: Deborah Fluidised Combustion Ltd
•
Filing: 1979-05-30
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Granted: 1981-05-19
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Expires: 1999-05-30
Abstract
Abstract A boiler wherein the combustion unit includes a fluidized bed which may be fluidized in a non-uniform manner to effect circulation of bed material by means of dual air distributors located within the bed.
Inventors
- 👤 Edwin Robinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:07
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/36; F; F22; F22B; F22B31/00; F22B31/0007; F22B31/0046; F22B31/0053; F23; F23C; F23C10/00; F23C10/02
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
A boiler comprising fuel burning means and means allowing heat exchange between the products of combustion of the fuel and a working fluid, the fuel burning means including a substantially cylindrical housing for accommodating a bed of particulate material, air distributors located within the housing so as to be surrounded by bed material, said air distributors effecting fluidisation of the bed material, said air distributors extending longitudinally of and being spaced from the housing and comprising first and second air distributors arranged on opposite sides of a vertical longitudinal plane through the bed and on each side extending substantially circumferentially with respect to the axis of the housing, and means for feeding air to the air distributors to effect circulation of the bed material in two zones on said opposite sides of said vertical longitudinal plane.
Claim 2
Dependent Claim
136 words
A boiler comprising fuel burning means and means allowing heat exchange between the products of combustion of the fuel and a working fluid, the fuel burning means including a substantially cylindrical housing for accommodating a bed of particulate material, air distributors located within the housing so as to be surrounded by bed material, said air distributors effecting fluidisation of the bed material, said air distributors extending longitudinally of and being spaced from the housing and comprising first and second air distributors arranged on opposite sides of a vertical longitudinal plane through the bed and on each side extending substantially circumferentially with respect to the axis of the housing, and means for feeding air to the air distributors to effect circulation of the bed material in two zones on said opposite sides of said vertical longitudinal plane.
Claim 3
Dependent Claim
27 words
A boiler according to claim 1, wherein the heat exchange means includes a plurality of tubes for transferring heat from the combustion gases to the working fluid.
Claim 4
Dependent Claim
30 words
A boiler according to claim 2, wherein the tubes are arranged as a single pass system in which the tubes pass through the boiler only once before leaving the boiler.
Claim 5
Dependent Claim
29 words
A boiler according to claim 2, wherein the tubes are arranged in a double pass system in which the tubes pass through the boiler twice before leaving the boiler.
Claim 6
Dependent Claim
37 words
A boiler according to claim 1, wherein the bed includes a spent fuel outlet, means for heating air by the spent fuel, and means for feeding the air heated by the spent fuel back to the boiler.
Claim 7
Dependent Claim
21 words
A boiler according to claim 1 further including a longitudinally arranged screw device for removing the spent fuel from the boiler.
Claim 8
Dependent Claim
15 words
A boiler according to claim 1 which includes a single fuel inlet to the bed.
Claim 9
Dependent Claim
122 words
Fuel combustion means adapted for fitting to a boiler, said fuel combustion means comprising a substantially cylindrical housing for accommodating a bed of particulate material, air distributors located within the housing so as to be surrounded by bed material, said air distributors effecting fluidisation of the bed material, said air distributors extending longitudinally of and being spaced from the housing and comprising first and second air distributors arranged on opposite sides of a vertical longitudinal plane through the bed and on each side extending substantially circumferentially with respect to the axis of the housing, and means for feeding air to the air distributors to effect circulation of the bed material in two zones on said opposite sides of said vertical longitudinal plane.
Claim 10
Dependent Claim
122 words
Fuel combustion means adapted for fitting to a boiler, said fuel combustion means comprising a substantially cylindrical housing for accommodating a bed of particulate material, air distributors located within the housing so as to be surrounded by bed material, said air distributors effecting fluidisation of the bed material, said air distributors extending longitudinally of and being spaced from the housing and comprising first and second air distributors arranged on opposite sides of a vertical longitudinal plane through the bed and on each side extending substantially circumferentially with respect to the axis of the housing, and means for feeding air to the air distributors to effect circulation of the bed material in two zones on said opposite sides of said vertical longitudinal plane.
References Cited (Backward Citations)
US783722A
Cited
GB1540378A
Cited
GB1522601A
Cited
US4026223A
Cited
GB2011594A
Cited
US4196676A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-05-18 | 1984-11-17 | 1985-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-05-18 | 1988-11-17 | 1989-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-05-18 | 1992-11-17 | 1993-05-19 | $7700.00 | Window Closed / Lapsed |