US4577567A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of combustion and burners
Assignee: BOC Group Ltd
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Filing: 1984-06-12
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Granted: 1986-03-25
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Expires: 2004-06-12
Abstract
Abstract A composition comprising a particulate fuel, typically pulverized coal, carried in water is formed such that it is readily able to be pumped without adding emulsifiers or lubricants to the composition. The composition typically includes at least 25% water and preferably 30 to 50% water. The composition is pumped to a burner 2 and is atomized therein, typically by means of a stream of oxygen supplied through a passage 6 in the nozzle 6 of the burner. This oxygen is taken from that supplied to a further passage for supporting combustion of the particulate fuel. A relatively short and intense flame can be produced at relatively low coal concentrations in the composition such that the need to use expensive emulsifiers etc. is avoided.
Inventors
- 👤 Colin Moore
- 👤 David P. Jenkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:48
CPC Classifications
F; F23; F23K; F23K1/00; F23K1/02; F23D; F23D1/00; F23D1/005
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
103 words
A method of burning a particulate fuel which comprises atomising a composition which comprises 50 to 70% by weight of particulate fuel and 30 to 50% by weight of an aqueous carrier and which composition is able to be pumped without the presence in the composition of an emulsifying agent or lubricant to facilitate such pumping, supplying said composition to a combustion zone and supplying to the combustion zone substantially pure oxygen or oxygen-enriched air at substantially ambient temperature such that a flame temperature of at least about 2000° F. is established in said zone and combustion of the particulate fuel is supported.
Claim 2
Independent Claim
103 words
A method of burning a particulate fuel which comprises atomising a composition which comprises 50 to 70% by weight of particulate fuel and 30 to 50% by weight of an aqueous carrier and which composition is able to be pumped without the presence in the composition of an emulsifying agent or lubricant to facilitate such pumping, supplying said composition to a combustion zone and supplying to the combustion zone substantially pure oxygen or oxygen-enriched air at substantially ambient temperature such that a flame temperature of at least about 2000° F. is established in said zone and combustion of the particulate fuel is supported.
Claim 3
Dependent Claim
17 words
A method accordingly to claim 1, in which the carrier is atomised upstream of the combustion zone.
Claim 4
Dependent Claim
19 words
A method according to claim 1, in which the composition is supplied to the combustion zone at ambient temperature.
Claim 5
Dependent Claim
14 words
A method according to claim 1, in which the particulate fuel is particulate coal.
Claim 6
Dependent Claim
25 words
A method as claimed in claim 4, in which the composition comprises from 55 to 65% by weight of coal, and a balance of water.
Claim 7
Dependent Claim
22 words
A method as claimed in claim 4, in which the composition comprises 60% by weight of coal, and a balance of water.
Claim 8
Dependent Claim
16 words
A method according to claim 1, in which the composition comprises relatively coarse particles of coal.
Claim 9
Dependent Claim
19 words
A method according to claim 7, in which the coal particles for the composition are formed by wet grinding.
Claim 10
Dependent Claim
19 words
A method according to claim 1, in which the composition is atomised by introducing an atomising agent into it.
Claim 11
Dependent Claim
16 words
A method according to claim 9, in which the atomising agent is a pressurised non-condensible fluid.
Claim 12
Dependent Claim
29 words
A method according to claim 9, in which the atomising agent is compressed air and is introduced into the composition upstream of a burner employed to burn the composition.
Claim 13
Dependent Claim
18 words
A method according to claim 9, in which oxygen or oxygen-enriched air is used as the atomising agent.
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) | 1989-03-24 | 1989-09-23 | 1990-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-24 | 1993-09-23 | 1994-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-24 | 1997-09-23 | 1998-03-25 | $7700.00 | Window Closed / Lapsed |