US3736908A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for starting a fluidized bed boiler
Assignee: United States Department of the Interior
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Filing: 1971-10-08
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Granted: 1973-06-05
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Expires: 1991-10-08
Abstract
Abstract Vertical barriers divide a large fluidized bed boiler into smaller regions. During starting, openings in the barriers control mixing of the bed particles without mechanical intervention.
Inventors
- 👤 S Ehrlich
- 👤 J Bishop
- 👤 E Robison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:40
CPC Classifications
F; F23; F23C; F23C10/00; F23C10/18; F23C2900/00; F23C2900/99006
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
174 words
A method for activating an oxidizing fluidized bed comprising of steps of: dividing a particulate bed into separate portions, fluidizing the bed to an expanded level, preventing any substantial migration of bed material between the separate portions at this expanded level by means of physical barriers between the portions, heating one separate portion of the bed to the ignition temperature of an oxidizing fuel, injecting the fuel into the heated portion to cause combustion and raise the heated portion to an operating level, providing openings through the physical barriers so that as the height of any portion of the bed increases from the expanded to the operating level the fuel and heated portion spills over into and heats an adjacent portion, when the adjacent portion reaches the ignition temperature, injecting fuel into the adjacent portion to cause combustion and raise the adjacent portion to the operating level, injecting fuel into subsequent portions of the bed when they reach the ignition temperature as a result of fuel and heated bed material spilling over into them.
Claim 2
Independent Claim
174 words
A method for activating an oxidizing fluidized bed comprising of steps of: dividing a particulate bed into separate portions, fluidizing the bed to an expanded level, preventing any substantial migration of bed material between the separate portions at this expanded level by means of physical barriers between the portions, heating one separate portion of the bed to the ignition temperature of an oxidizing fuel, injecting the fuel into the heated portion to cause combustion and raise the heated portion to an operating level, providing openings through the physical barriers so that as the height of any portion of the bed increases from the expanded to the operating level the fuel and heated portion spills over into and heats an adjacent portion, when the adjacent portion reaches the ignition temperature, injecting fuel into the adjacent portion to cause combustion and raise the adjacent portion to the operating level, injecting fuel into subsequent portions of the bed when they reach the ignition temperature as a result of fuel and heated bed material spilling over into them.
Claim 3
Dependent Claim
64 words
A method for activating an oxidizing fluidized bed as claimed in claim 1 in which the step of providing openings includes: providing openings above the expanded level to enable spilling over and heating of the adjacent portion, And providing openings near the bottom of the bed to enable migration of bed material from the adjacent to the heated portion to maintain a level bed.
Claim 4
Dependent Claim
61 words
A method for activating an oxidizing fluidized bed as claimed in claim 1 in which: the one separate portion has a smaller mass than the other portions, and the openings through the physical barriers are arranged so that, as any portion reaches the operating level, spilling over from that portion affects only one inactive portion of the bed at a time.
Claim 5
Dependent Claim
61 words
A method for activating an oxidizing fluidized bed as claimed in claim 2 in which: the one separate portion has a smaller mass than the other portions, and the openings through the physical barriers are arranged so that, as any portion reaches the operating level, spilling over from that portion affects only one inactive portion of the bed at a time.
Claim 6
Dependent Claim
120 words
In an oxidizing fluidized bed combustion chamber having a vessel, a bed of particulate material within the vessel, a source of gas for fluidizing the particulate material, and a source of fuel for combustion within the bed of particulate material, the improvement comprising: an array of vertical barriers dividing the bed into separate portions, means for heating one of the portions to the ignition temperature of the fuel, openings through the physical barriers above the expanded level of the bed caused by fluidization without combustion, but below the normal operating level of the bed caused by combustion, so that combustion in any one portion of the bed causes fuel and heated bed material to spill over into an adjacent portion.
Claim 7
Dependent Claim
120 words
In an oxidizing fluidized bed combustion chamber having a vessel, a bed of particulate material within the vessel, a source of gas for fluidizing the particulate material, and a source of fuel for combustion within the bed of particulate material, the improvement comprising: an array of vertical barriers dividing the bed into separate portions, means for heating one of the portions to the ignition temperature of the fuel, openings through the physical barriers above the expanded level of the bed caused by fluidization without combustion, but below the normal operating level of the bed caused by combustion, so that combustion in any one portion of the bed causes fuel and heated bed material to spill over into an adjacent portion.
Claim 8
Dependent Claim
40 words
An oxidizing fluidized bed combination chamber as claimed in claim 5, further comprising: openings through the physical barriers near the bottom of the bed to enable migration of bed material between the portions in order to maintain a level bed.
Claim 9
Dependent Claim
51 words
An oxidizing fluidized bed as claimed in claim 5 in which: the one separate portion is relatively small, and the openings through the barriers are arranged so that, as any portion reaches the operating level, spilling over from that portion affects only one inactive portion of the bed at a time.
Claim 10
Dependent Claim
51 words
An oxidizing fluidized bed as claimed in claim 6 in which: the one separate portion is relatively small, and the openings through the barriers are arranged so that, as any portion reaches the operating level, spilling over from that portion affects only one inactive portion of the bed at a time.
Claim 11
Dependent Claim
17 words
An oxidizing fluidized bed as claimed in claim 5 in which the vertical barriers include boiler tubes.
Claim 12
Dependent Claim
17 words
An oxidizing fluidized bed as claimed in claim 6 in which the vertical barriers include boiler tubes.
Claim 13
Dependent Claim
17 words
An oxidizing fluidized bed as claimed in claim 7 in which the vertical barriers include boiler tubes.
Claim 14
Dependent Claim
17 words
An oxidizing fluidized bed as claimed in claim 8 in which the vertical barriers include boiler tubes.
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) | 1976-06-04 | 1976-12-04 | 1977-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-04 | 1980-12-04 | 1981-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-04 | 1984-12-04 | 1985-06-05 | $7700.00 | Window Closed / Lapsed |