Patent US3881857A successfully refreshed from Google Patents.
US3881857A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustor
Assignee: BP Trading Ltd
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Filing: 1974-03-06
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Granted: 1975-05-06
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Expires: 1994-03-06
Abstract
Abstract A distributor plate suitable for use in a fluidised bed furnace or gasifier comprises a chamber with fuel gas and oil inlets and a number of vertical air tubes passing through the chamber. The interior of the air tubes communicate with the chamber, and the upper end of the air tubes have outlet heads that supplied combustible mixtures to the fluidised bed. The chamber is divided into zones having increasing numbers of air tubes per zone so that progressively increasing areas of the distributor plate may be ignited during start up of a fluidised bed furnace.
Inventors
- 👤 Herbert Raymond Hoy
- 👤 Alan Gregson Roberts
- 👤 Dennis Malcolm Wilkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:11
CPC Classifications
F; F23; F23C; F23C10/00; F23C10/18; B; B01; B01J; B01J8/00; B01J8/18; B01J8/24; B01J8/44; F23C2900/00; F23C2900/99006
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
A distributor plate for igniting a fluidized bed furnace comprising: a chamber having fuel gas inlets; a plurality of air tubes passing through the chamber, the interior of the air tubes being in communication with the chamber by means of holes, one end of the air tubes terminating in heads having outlets; dividing means in the chamber adapted to allow fuel gas to be supplied to a progressively increasing number of air tubes and fuel gas ignition means substantially adjacent to the plate.
Claim 2
Dependent Claim
83 words
A distributor plate for igniting a fluidized bed furnace comprising: a chamber having fuel gas inlets; a plurality of air tubes passing through the chamber, the interior of the air tubes being in communication with the chamber by means of holes, one end of the air tubes terminating in heads having outlets; dividing means in the chamber adapted to allow fuel gas to be supplied to a progressively increasing number of air tubes and fuel gas ignition means substantially adjacent to the plate.
Claim 3
Dependent Claim
22 words
A distributor plate according to claim 1 in which the dividing means comprise division plates fixed so as to sub-divide the chamber.
Claim 4
Dependent Claim
18 words
A distributor plate according to claim 1 in which the fuel gas ignition means is an auxiliary burner.
Claim 5
Dependent Claim
16 words
A distributor plate according to claim 3 in which the auxiliary burner has a spark igniter.
Claim 6
Dependent Claim
35 words
A distributor plate according to claim 1 in which the outlets form passageways through the side of the air tube, the direction of the passageways being substantially perpendicular to the wall of the air tube.
Claim 7
Dependent Claim
33 words
A distributor plate according to claim 1 in which the total cross-sectional area of the outlets of the tube heads is from 1 1/2 to 3 percent of the area of the plate.
Claim 8
Dependent Claim
19 words
A distributor plate according to claim 1 in which the air tube density is 10-30 tubes per square foot.
Claim 9
Dependent Claim
18 words
A distributor plate according to claim 1 in which the air tubes are 6 to 12 inches long.
Claim 10
Dependent Claim
18 words
A device according to claim 3 wherein the auxiliary burner is set into the walls of said furnace.
Claim 11
Dependent Claim
121 words
In a fluidized bed furnace, a distributor plate comprising: a chamber having fuel gas inlets; a plurality of air tubes passing through the chamber and having a density in the range of 10-30 tubes per square foot, the interior of the air tubes being in communication with the chamber through passageways therein, said passageways being substantially perpendicular to the wall of the tubes, one end of the air tubes terminating in heads having outlets, said outlets forming 1- 1/2 to 3 percent of the area of the plate; division plates fixed within said chamber and adapted to allow fuel gas to be supplied to a progressively increasing number of air tubes; and fuel gas auxiliary burner substantially adjacent to the plate.
Claim 12
Dependent Claim
121 words
In a fluidized bed furnace, a distributor plate comprising: a chamber having fuel gas inlets; a plurality of air tubes passing through the chamber and having a density in the range of 10-30 tubes per square foot, the interior of the air tubes being in communication with the chamber through passageways therein, said passageways being substantially perpendicular to the wall of the tubes, one end of the air tubes terminating in heads having outlets, said outlets forming 1- 1/2 to 3 percent of the area of the plate; division plates fixed within said chamber and adapted to allow fuel gas to be supplied to a progressively increasing number of air tubes; and fuel gas auxiliary burner substantially adjacent to the plate.
Claim 13
Dependent Claim
16 words
A fluidised bed furnace according to claim 10 in which the burner axis is inclined downwards.
Claim 14
Dependent Claim
22 words
A fluidised bed furnace according to claim 11 in which the burner axis is at an angle of 20*-30* to the horizontal.
Claim 15
Independent Claim
74 words
A method of igniting a fluidized bed combustion furnace or fluidized bed gasifier comprising passing a fluidizing gas containing oxygen into a fluidized bed in a furnace or gasifier through the air tubes of a distributor plate, passing fuel gas into a predetermined fraction or zone of the tubes and igniting the resultant combustible fuel gas/air mixture; and, sequentially increasing the number or zones of tubes carrying fuel gas and igniting the gas therein.
Claim 16
Independent Claim
74 words
A method of igniting a fluidized bed combustion furnace or fluidized bed gasifier comprising passing a fluidizing gas containing oxygen into a fluidized bed in a furnace or gasifier through the air tubes of a distributor plate, passing fuel gas into a predetermined fraction or zone of the tubes and igniting the resultant combustible fuel gas/air mixture; and, sequentially increasing the number or zones of tubes carrying fuel gas and igniting the gas therein.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |