US4325311A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and equipment for treatment of fuel for fluidized bed combustion
Assignee: Czech Academy of Sciences
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Filing: 1980-05-16
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Granted: 1982-04-20
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Expires: 2000-05-16
Abstract
Abstract The invention relates to the method and equipment for treatment of fuel for fluidized bed combustion, which includes drying, classification and crushing of the fuel. The method for treatment of fuel comprises mixing the fuel with hot ash removed from the fluidized bed combustor and drying said mixture in a fluidized bed dryer in which the velocity of the fluidization fluid equals or is lower than the minimum fluidization velocity of particles in the fluidized bed combustor. The equipment for treatment of fuel comprises a bunker, crusher and dryer, comprising a fluidized bed dryer provided with appropriate piping for interconnection of the fluidized bed dryer, fluidized bed combuster, fuel bunker and crusher.
Inventors
- 👤 Jaroslav Beranek
- 👤 Jan Cermak
- 👤 Jaroslav Dobrozemsky
- 👤 Vratislav Fibinger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:01
CPC Classifications
F; F23; F23C; F23C10/00; F23C10/18; F23K; F23K1/00; F23K1/04
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
164 words
A method for treatment of particulate fuel for fluidized bed combustion in a fluidized bed combustor, comprising: removing hot particles from the bed of said combustor and passing same to a fluidized bed dryer, mixing the fuel with the hot particles removed from the bed of the fluidized bed combustor and, drying the mixture at a drying temperature in the fluidized bed dryer while introducing fluidization fluid to said dryer at a velocity not greater than the minimum fluidization velocity of particles in the fluidized bed combustor, removing particles from the fluidized bed in the dryer, charging the same to the fluidized bed combustor, removing particulate material which fluidizes at a fluidizing fluid velocity higher than the fluidizing fluid velocity in the fluidized bed dryer from the bottom of the bed in the fluidized bed dryer, and passing the same to a crusher wherein the particle size is reduced, and returning the particulate material having a reduced particle size to the fluidized bed dryer.
Claim 2
Independent Claim
164 words
A method for treatment of particulate fuel for fluidized bed combustion in a fluidized bed combustor, comprising: removing hot particles from the bed of said combustor and passing same to a fluidized bed dryer, mixing the fuel with the hot particles removed from the bed of the fluidized bed combustor and, drying the mixture at a drying temperature in the fluidized bed dryer while introducing fluidization fluid to said dryer at a velocity not greater than the minimum fluidization velocity of particles in the fluidized bed combustor, removing particles from the fluidized bed in the dryer, charging the same to the fluidized bed combustor, removing particulate material which fluidizes at a fluidizing fluid velocity higher than the fluidizing fluid velocity in the fluidized bed dryer from the bottom of the bed in the fluidized bed dryer, and passing the same to a crusher wherein the particle size is reduced, and returning the particulate material having a reduced particle size to the fluidized bed dryer.
Claim 3
Dependent Claim
36 words
A method according to claim 1, further comprising controlling the temperature in the fluidized bed dryer by controlling the amount of flow of hot particles from the fluidized bed combustor which are mixed with the fuel.
References Cited (Backward Citations)
US1942687A
Cited
US3366080A
Cited
US3677404A
Cited
US3921590A
Cited
US3888193A
Cited
US3955512A
Cited
US3897739A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-19 | 1985-10-19 | 1986-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-19 | 1989-10-19 | 1990-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-19 | 1993-10-19 | 1994-04-20 | $7700.00 | Window Closed / Lapsed |