US4530207A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power plant with a fluidized bed combustion chamber
Assignee: ABB Stal AB
•
Filing: 1984-04-20
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Granted: 1985-07-23
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Expires: 2004-04-20
Abstract
Abstract A power plant with a combustion chamber (8) with a fluidized bed (14) and a device for adjusting the bed height, comprising a storage container (21) for bed material, the storage container (21) being connected to the combustion chamber (8) by a first conduit (22) for feeding out bed compound from the combustion chamber (8) to the container (21) and a second conduit (23) for returning bed compound from the container (21) to the combustion chamber (8). The storage container (21) is connected, via a conduit (34) with a valve, to a space having lower pressure than the pressure in the combustion chamber (8). The return conduit (23) is connected, via a conduit (67) with a valve, to a pressure gas source (10) having higher pressure than the pressure in the combustion chamber (8). Transport of bed compound from the combustion chamber (8) is achieved by reducing the pressure in the storage container (21). Return transport of bed compound to the combustion chamber (8) is brought about by supplying transport gas to the return conduit (23).
Inventors
- 👤 Roine Brannstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:49
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1809; F; F23; F23C; F23C10/00; F23C10/16; F23R; F23R5/00; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00106; B01J2208/00265; B01J2208/00274; B01J2208/00389; B01J2208/00407; B01J2208/00477; B01J2208/00495; B01J2208/00548; B01J2208/0061
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
128 words
A power plant with a combustion chamber with a fluidized bed for combustion of fuel supplied to the bed and with means for adjusting the bed height by transferring bed material from the combustion chamber to a storage container and returning bed material from the storage container to the combustion chamber in which the storage container for bed material is connected to the combustion chamber by means of feed-out and return conduits in which the storage container is connected, via a conduit with a valve, to a space having a lower pressure than that in the combustion chamber, and in which the return conduit is connected, via a conduit with a valve, to a pressure gas source having a higher pressure than the pressure in the combustion chamber.
Claim 2
Dependent Claim
128 words
A power plant with a combustion chamber with a fluidized bed for combustion of fuel supplied to the bed and with means for adjusting the bed height by transferring bed material from the combustion chamber to a storage container and returning bed material from the storage container to the combustion chamber in which the storage container for bed material is connected to the combustion chamber by means of feed-out and return conduits in which the storage container is connected, via a conduit with a valve, to a space having a lower pressure than that in the combustion chamber, and in which the return conduit is connected, via a conduit with a valve, to a pressure gas source having a higher pressure than the pressure in the combustion chamber.
Claim 3
Dependent Claim
27 words
A power plant according to claim 1, in which the combustion chamber is enclosed in a pressure vessel pressurized by compressed combustion air (a so-called PFBC plant).
Claim 4
Dependent Claim
18 words
A power plant according to claim 2, in which the storage container is placed inside the pressure vessel.
Claim 5
Dependent Claim
28 words
A power plant according to claim 1 or 2, in which the outlet end of the feed-out conduit opens out into a dust separator above the storage container.
Claim 6
Dependent Claim
35 words
A power plant according to claim 1 or 2, in which the outlet end of the feed-out conduit opens out directly into the storage container, in the upper part thereof, and is substantially downwardly directed.
Claim 7
Dependent Claim
32 words
A power plant according to claim 5, in which the wall of the outlet end of the feed-out conduit includes a portion provided with openings at a distance from an outlet orifice.
Claim 8
Dependent Claim
28 words
A power plant according to claim 6, in which the outlet end of the feed-out conduit is provided with a sleeve placed concentrically around the portion with openings.
Claim 9
Dependent Claim
50 words
A power plant according to claim 1 or 2, in which the feed-out conduit at its inlet end in the bed is provided with a nozzle, which is connected to a pressure gas source through a conduit with a valve for control of the material flow in the feed-out conduit.
Claim 10
Dependent Claim
37 words
A power plant according to claim 2, in which the feed-out conduit at its inlet end in the bed is provided with a nozzle, which is connected to the pressure vessel through a conduit with a valve.
Claim 11
Dependent Claim
30 words
A power plant according to claim 1 or 2, in which the return conduit is connected, through a conduit with a valve, to a pressure gas source for transport gas.
Claim 12
Dependent Claim
35 words
A power plant according to claim 10, in which the return conduit includes a fluid valve of L-valve type, or the like, and in which the pressure gas source is connected to this fluid valve.
Claim 13
Dependent Claim
24 words
A power plant according to claim 2, in which the return conduit is connected to the pressure vessel through a conduit with a valve.
Claim 14
Dependent Claim
34 words
A power plant according to claim 12, in which the return conduit includes a material lock of L-valve type, or the like, and in which the pressure vessel is connected to said material lock.
Claim 15
Dependent Claim
20 words
A power plant according to claim 1 or 2, in which the storage container is provided with a heat insulation.
Claim 16
Dependent Claim
18 words
A power plant according to claim 14, in which the storage container is provided with a heating device.
Claim 17
Dependent Claim
45 words
A power plant according to claim 1 or 2, in which the conduit to a space having a lower pressure includes a pressure reduction device whereby combustion air is allowed to pass past the pressure reduction device in order thus to cool the transport gas.
Claim 18
Dependent Claim
40 words
A power plant according to claim 1 or 2, in which a number of storage containers, each one provided with feed-out and return conduits, are used for feeding out and returning bed material to and from the common combustion chamber.
Claim 19
Dependent Claim
23 words
A power plant according to claim 11, in which the L valve is provided with means for the supply of inert sealing gas.
Claim 20
Dependent Claim
16 words
A power plant according to claim 18, in which the sealing gas consists of water vapour.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-22 | 1989-01-21 | 1989-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-22 | 1993-01-21 | 1993-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-22 | 1997-01-21 | 1997-07-23 | $7700.00 | Window Closed / Lapsed |