US4627367A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hot gas generation
Assignee: Coal Industry Patents Ltd
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Filing: 1984-11-14
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Granted: 1986-12-09
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Expires: 2004-11-14
Abstract
Abstract In a hot gas generating apparatus coal is fed to a first gasifying fluidized bed wherein it is partially gasified to generate a combustible gas and char. The char is circulated to a second combustion fluidized bed for burning in the presence of excess air. The combustible gas is mixed with the oxygen rich gases from the second bed and burnt to give a hot gas product.
Inventors
- 👤 Andrew R. Butt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:56
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/18; B01J8/1809; B01J8/24; B01J8/26; B01J8/34; B01J8/36; C; C10; C10J; C10J3/00; C10J3/46; C10J3/48; C10J3/482; C10J3/54; C10J3/56; F; F23; F23C; F23C10/00; F23C10/002; F23C10/005; F23C6/00; F23C6/02; B01J2208/00; B01J2208/00008; B01J2208/00017; B01J2208/00327; C10J2300/00; C10J2300/09; C10J2300/0913; C10J2300/093; C10J2300/094; C10J2300/16; C10J2300/1603; C10J2300/1606; Y; Y02; Y02E; Y02E20/00; Y02E20/34
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
124 words
A method of generating a hot gas including the steps of establishing a first fluidised bed of particulate material and a second fluidised bed of particulate material adjacent the first fluidised bed, feeding coal to the first fluidised bed, partially gasifying the coal in the said first fluidised bed to generate a combustible gas and char, circulating material in a bi-directional manner between the first and second beds across a mutual boundary, fluidising the material at the boundary during circulation thereof, burning the char in the second fluidised bed to generate oxygen rich gases, mixing the combustible and oxygen rich gases downstream of the first and second beds, and burning the combustible gas in the oxygen rich gases to generate a hot gas product.
Claim 2
Independent Claim
124 words
A method of generating a hot gas including the steps of establishing a first fluidised bed of particulate material and a second fluidised bed of particulate material adjacent the first fluidised bed, feeding coal to the first fluidised bed, partially gasifying the coal in the said first fluidised bed to generate a combustible gas and char, circulating material in a bi-directional manner between the first and second beds across a mutual boundary, fluidising the material at the boundary during circulation thereof, burning the char in the second fluidised bed to generate oxygen rich gases, mixing the combustible and oxygen rich gases downstream of the first and second beds, and burning the combustible gas in the oxygen rich gases to generate a hot gas product.
Claim 3
Dependent Claim
23 words
A method according to claim 1 in which the char is burnt within the second fluidised bed in the presence of excess air.
Claim 4
Dependent Claim
22 words
A method according to claim 1 in which material circulated between the first and second beds is fluidised during the circulation thereof.
Claim 5
Dependent Claim
31 words
A method according to claim 1 in which the circulation of material between the first and second beds is achieved by fluidising the first and second beds at different fluidising velocities.
Claim 6
Dependent Claim
23 words
A method according to claim 4 in which the fluidising velocity in the second bed is greater than that in the first bed.
Claim 7
Dependent Claim
27 words
A method according to claim 4 in which the rate of circulation of material is varied by varying the fluidising velocities in the first and second beds.
Claim 8
Dependent Claim
26 words
A method according to claim 1 in which the circulation of material occurs adjacent the bases of the first and second beds across the mutual boundary.
Claim 9
Dependent Claim
19 words
A method according to claim 1 in which the plan areas of the first and second beds are equal.
Claim 10
Dependent Claim
35 words
A method according to claim 1 in which coal is introduced into the second fluidised bed in order to maintain the temperature of the bed at the requisite level for the combustion of the char.
Claim 11
Dependent Claim
17 words
A method according to claim 1 in which coal is fed continuously into the first fluidised bed.
References Cited (Backward Citations)
GB1439457A
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GB1434314A
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GB1453400A
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GB1466813A
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GB1485319A
Cited
US4253409A
Cited
US4344373A
Cited
US4325327A
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US4419966A
Cited
US4344371A
Cited
US4457289A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-12-08 | 1990-06-09 | 1990-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-08 | 1994-06-09 | 1994-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-08 | 1998-06-09 | 1998-12-09 | $7700.00 | Window Closed / Lapsed |