US4229183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of refining solid fuel of organic vegetable material
Assignee: Svenska Flaktfabriken AB
•
Filing: 1979-03-30
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Granted: 1980-10-21
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Expires: 1999-03-30
Abstract
Abstract A method for refining organic material such as bark, wood shavings, wood chips, other wood waste and peat for use as a solid fuel or for gas generation in which the material after dewatering is disintegrated and dried by the flue gases passing from the heat exchange surfaces of the furnace in which the material is burned.
Inventors
- 👤 Jan-Mats Eneroth
- 👤 Sven A. Nordfeldt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:58
CPC Classifications
C; C10; C10F; C10F5/00; C10L; C10L5/00; C10L5/40; C10L5/44; Y; Y02; Y02E; Y02E50/00; Y02E50/10; Y02E50/30
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
95 words
A method of refining solid fuel of organic vegetable material, which fuel is dried with utilization of drying gases, characterized in that the fuel is supplied to a mill together with an adjusted amount of drying gases, in which mill the material is disintegrated to finely distributed state and dried simultaneously with said disintegration, whereafter the dried disintegrated material is transported pneumatically by the drying gas from said mill and is further dried in at least one pneumatic drying step, and the material thereafter is separated from the drying gas to produce refined solid fuel.
Claim 2
Independent Claim
95 words
A method of refining solid fuel of organic vegetable material, which fuel is dried with utilization of drying gases, characterized in that the fuel is supplied to a mill together with an adjusted amount of drying gases, in which mill the material is disintegrated to finely distributed state and dried simultaneously with said disintegration, whereafter the dried disintegrated material is transported pneumatically by the drying gas from said mill and is further dried in at least one pneumatic drying step, and the material thereafter is separated from the drying gas to produce refined solid fuel.
Claim 3
Dependent Claim
21 words
A method as defined in claim 1, characterized in that the fuel consists of bark, which has been de-watered by pressing.
Claim 4
Dependent Claim
31 words
A method as defined in claim 1, characterized in that the fuel consists of a mixture of one or more of bark, wood shavings, wood chips, other wood waste and peat.
Claim 5
Dependent Claim
18 words
A method as defined in claim 1, characterized in that the drying gas consists of inert waste gases.
Claim 6
Dependent Claim
34 words
A method as defined in claim 1, characterized in that the drying gas is taken from the pre-heating and after-heating surfaces of a firebox, so that a condition suitable for the drying is obtained.
Claim 7
Dependent Claim
24 words
A method as defined in claim 1, characterized in that the material is dried to a final dry content of between 70 and 90%.
Claim 8
Dependent Claim
35 words
A method as defined in claim 1, including the step of combusting the separated refined fuel and characterized in that the said drying gas consists of flue gases from the combustion of the refined fuel.
Claim 9
Dependent Claim
26 words
A method as defined in claim 1, characterized in that the material is finely disintegrated in said mill to produce refined fuel in a powder state.
Claim 10
Dependent Claim
17 words
A method as defined in claim 8, characterized in that the refined fuel is combusted by powder-firing.
Claim 11
Dependent Claim
16 words
A method as defined in claim 1, characterized in that the material is pelletized after refining.
Claim 12
Dependent Claim
18 words
A method as defined in claim 1, characterized in that the material is formed to briquets after refining.
Claim 13
Dependent Claim
25 words
A method as defined in claim 1, characterized in that the refined fuel is conveyed to gas generation where it is used for gas generation.
Claim 14
Dependent Claim
30 words
A method as defined in claim 1, characterized in that the drying gas separated from the material is cleaned in a dust separator before it is discharged into the atmosphere.
References Cited (Backward Citations)
US1870522A
Cited
US3064592A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-21 | 1984-04-21 | 1984-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-21 | 1988-04-21 | 1988-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-21 | 1992-04-21 | 1992-10-21 | $7700.00 | Window Closed / Lapsed |