US4558652A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion of coal-water slurries
Assignee: Babcock and Wilcox Co
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Filing: 1985-05-31
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Granted: 1985-12-17
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Expires: 2005-05-31
Abstract
Abstract A method of burning a coal-water slurry capable of being retrofitted to oil and gas fired industrial and utility steam boilers or as original equipment in new units using essentially pure oxygen, oxygen-enriched air or hydrogen-oxygen mixtures as the atomizing fluid in a burner atomizer.
Inventors
- 👤 William Downs
- 👤 John M. Rackley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:11
CPC Classifications
F; F23; F23D; F23D1/00; F23D1/005; Y; Y02; Y02E; Y02E20/00; Y02E20/34
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
57 words
A combustion process for achieving stable ignition of coal-water slurries during start-up of industrial and utility steam generators comprising: introducing essentially pure oxygen in a dual-flow atomizer; introducing a coal-water slurry in a dual-flow atomizer; atomizing and igniting the slurry, and switching from essentially pure oxygen to a conventional atomizing fluid after stable ignition of the slurry.
Claim 2
Dependent Claim
57 words
A combustion process for achieving stable ignition of coal-water slurries during start-up of industrial and utility steam generators comprising: introducing essentially pure oxygen in a dual-flow atomizer; introducing a coal-water slurry in a dual-flow atomizer; atomizing and igniting the slurry, and switching from essentially pure oxygen to a conventional atomizing fluid after stable ignition of the slurry.
Claim 3
Dependent Claim
59 words
A combustion process for achieving stable ignition of coal-water slurries during start-up of industrial and utility steam generators comprising: introducing oxygen-enriched air in a predetermined ratio in a dual-flow atomizer; introducing a coal-water slurry in a dual-flow atomizer; atomizing and igniting the slurry, and switching from oxygen-enriched air to a conventional atomizing fluid after stable ignition of the slurry.
Claim 4
Dependent Claim
59 words
A combustion process for achieving stable ignition of coal-water slurries during start-up of industrial and utility steam generators comprising: introducing oxygen-enriched air in a predetermined ratio in a dual-flow atomizer; introducing a coal-water slurry in a dual-flow atomizer; atomizing and igniting the slurry, and switching from oxygen-enriched air to a conventional atomizing fluid after stable ignition of the slurry.
Claim 5
Dependent Claim
60 words
A combustion process for achieving stable ignition of coal-water slurries during start-up of industrial and utility steam generators comprising: introducing hydrogen and oxygen to separate ports in a burner atomizer; introducing a coal-water slurry in a burner atomizer; atomizing and igniting the slurry, and switching from hydrogen and oxygen to a conventional atomizing fluid after stable ignition of the slurry.
Claim 6
Dependent Claim
60 words
A combustion process for achieving stable ignition of coal-water slurries during start-up of industrial and utility steam generators comprising: introducing hydrogen and oxygen to separate ports in a burner atomizer; introducing a coal-water slurry in a burner atomizer; atomizing and igniting the slurry, and switching from hydrogen and oxygen to a conventional atomizing fluid after stable ignition of the slurry.
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) | 1988-12-16 | 1989-06-17 | 1989-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-16 | 1993-06-17 | 1993-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-16 | 1997-06-17 | 1997-12-17 | $7700.00 | Window Closed / Lapsed |