US3910208A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluidized bed furnace having coarse particle discharging device
Assignee: Rheinstahl AG
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Filing: 1974-11-08
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Granted: 1975-10-07
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Expires: 1994-11-08
Abstract
Abstract A fluidized bed furnace for burning dehydrated sludge, comprises a furnace housing having a bottom on which the fluidized bed is supported. Means are provided for directing gases, including combustion air, upwardly through the fluidized bed in order to reduce the sludge to fine ash dust which is carried off with a portion of the gases and also to coarse particles which are removed from the furnace bottom. For this purpose, the combustion chamber is provided with a discharge opening directly adjacent the bottom, and preferably with a bottom which is aligned with the surface of the furnace bottom. The diameter of the discharge opening is such that it will allow very large size coarse particles to pass therethrough. A rotary drum is mounted so that its one end connects to the discharge opening, and it is provided with a screw having a pitch of a size to permit coarse particles to move between blade elements and to move them out of the discharge opening into a collecting shaft where the coarse particles are dropped into a receiving device.
Inventors
- 👤 Erhard Albrecht
- 👤 Heinz Wilhelm Oepke
- 👤 Herbert Wulfmeier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:41
CPC Classifications
F; F23; F23C; F23C10/00; F23C10/18; F23C10/24; B; B01; B01J; B01J8/00; B01J8/0015; B01J8/002; F27; F27B; F27B15/00; F27B15/02; F27B15/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
199 words
A fluidized bed furnace for dehydrated sludge, comprising a furnace housing having a bottom on which the fluidized bed is supported, means for directing combustion air upwardly through said bottom for maintaining the fluidized bed and for reducing the sludge to fine ash dust which is directed out of said furnace with a portion of the combustion air and for also generating coarse particles, wall means extending upwardly from, around and over said bottom and defining a fluidized bed chamber portion and a combustion chamber thereabove, means for admitting a sludge material connected into said wall means to said combustion chamber adjacent one side thereof, a discharge opening defined in said wall means adjacent said bottom on the opposite side of said wall means from said admitting means to permit withdrawal of relatively large size coarse particles therethrough, a discharge conduit connected to said discharge opening having a rotatable drum portion with an interior wall having a screw thread therein which when rotated will advance coarse particles out of said discharge conduit from said discharge opening, said threads having a pitch large enough to accommodate the size of a largest occurring particle to be moved therebetween through said discharge.
Claim 2
Dependent Claim
199 words
A fluidized bed furnace for dehydrated sludge, comprising a furnace housing having a bottom on which the fluidized bed is supported, means for directing combustion air upwardly through said bottom for maintaining the fluidized bed and for reducing the sludge to fine ash dust which is directed out of said furnace with a portion of the combustion air and for also generating coarse particles, wall means extending upwardly from, around and over said bottom and defining a fluidized bed chamber portion and a combustion chamber thereabove, means for admitting a sludge material connected into said wall means to said combustion chamber adjacent one side thereof, a discharge opening defined in said wall means adjacent said bottom on the opposite side of said wall means from said admitting means to permit withdrawal of relatively large size coarse particles therethrough, a discharge conduit connected to said discharge opening having a rotatable drum portion with an interior wall having a screw thread therein which when rotated will advance coarse particles out of said discharge conduit from said discharge opening, said threads having a pitch large enough to accommodate the size of a largest occurring particle to be moved therebetween through said discharge.
Claim 3
Dependent Claim
23 words
A fluidized bed furnace, according to claim 1, including a shut-off gate in said discharge between said rotary drum and said discharge opening.
Claim 4
Dependent Claim
28 words
A fluidized bed furnace, according to claim 1, including a collecting chamber connected to said discharge conduit on the side thereof opposite to the connection to said furnace.
Claim 5
Dependent Claim
25 words
A fluidized bed furnace, according to claim 3, including at least one nozzle for directing a cooling water against said drum adjacent said collecting chamber.
Claim 6
Dependent Claim
32 words
A fluidized bed furnace, according to claim 1, wherein said drum may be rotated in either direction for the purpose of discharging materials from said furnace or supplying material to said furnace.
Claim 7
Dependent Claim
31 words
A fluidized bed furnace, according to claim 1, wherein means for admitting sludge material is provided in the roof of said furnace on the side thereof opposite to said discharge opening.
Claim 8
Independent Claim
83 words
A device for use with a fluidized bed furnace which is connectable to the furnace adjacent the bottom thereof, comprising a discharge passage having a rotatable drum portion with an interior wall having a screw thread extending therealong of a pitch such that the spacing between successive thread windings is large enough to accommodate the largest size particles expected to be formed in the fluidized bed and having a central passage defined between the threads for permitting smaller size particles to pass therethrough.
Claim 9
Independent Claim
83 words
A device for use with a fluidized bed furnace which is connectable to the furnace adjacent the bottom thereof, comprising a discharge passage having a rotatable drum portion with an interior wall having a screw thread extending therealong of a pitch such that the spacing between successive thread windings is large enough to accommodate the largest size particles expected to be formed in the fluidized bed and having a central passage defined between the threads for permitting smaller size particles to pass therethrough.
Claim 10
Dependent Claim
33 words
A device for use with a fluidized bed furnace, according to claim 7, including a shut-off gate arranged between said rotatable drum and the end of the discharge passage connected to the furnace.
Claim 11
Dependent Claim
42 words
A device for use with a fluidized bed furnace, according to claim 8, including a receiving shaft connected to said discharge conduit at the end thereof opposite to the end connected to the furnace for receiving the particles from the discharge conduit.
Claim 12
Dependent Claim
39 words
A device for use with a fluidized bed furnace, according to claim 9, including a spray nozzle carried in said collecting chamber for directing a spray against said drum adjacent the end thereof which discharges into said receiving chamber.
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) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |