US4718361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alkali injection system with controlled CO2 /O2 ratios for combustion of coal
Assignee: GOVERNMENT OF UNITED STATES ENERGY THE, Department of
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Filing: 1986-11-21
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Granted: 1988-01-12
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Expires: 2006-11-21
Abstract
Abstract A high temperature combustion process for an organic fuel containing sulfurn which the nitrogen of air is replaced by carbon dioxide for combination with oxygen with the ratio of CO 2 /O 2 being controlled to generate combustion temperatures above 2000 K. for a gas-gas reaction with SO 2 and an alkali metal compound to produce a sulfate and in which a portion of the carbon-dioxide rich gas is recycled for mixing with oxygen and/or for injection as a cooling gas upstream from heating exchangers to limit fouling of the exchangers, with the remaining carbon-dioxide rich gas being available as a source of CO 2 for oil recovery and other purposes.
Inventors
- 👤 Gregory F. Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:10
CPC Classifications
F; F23; F23C; F23C99/00; F23C9/00; F23J; F23J15/00; F23J15/06; F23L; F23L2900/00; F23L2900/07001; Y; Y02; Y02E; Y02E20/00; Y02E20/30; Y02E20/32
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
119 words
A combustion process for an organic fuel comprising the steps of providing a combustion zone for burning a fuel with oxygen, introducing an organic fuel to a combustion zone, introducing a mixture of carbon dioxide and oxygen to the combustion zone to form a combustion gas, the mixture having essentially no nitrogen gas, providing heat exchanger means downstream from the combustion zone, introducing a carbon dioxide as a cooling gas into the combustion gas between the combustion zone and the heat exchanger means to reduce the temperature of the combustion gas to below about 1150K and from a cooled combustion gas, and, recycling a portion of the cooled combustion gas to be combined with oxygen for the combustion zone.
Claim 2
Dependent Claim
119 words
A combustion process for an organic fuel comprising the steps of providing a combustion zone for burning a fuel with oxygen, introducing an organic fuel to a combustion zone, introducing a mixture of carbon dioxide and oxygen to the combustion zone to form a combustion gas, the mixture having essentially no nitrogen gas, providing heat exchanger means downstream from the combustion zone, introducing a carbon dioxide as a cooling gas into the combustion gas between the combustion zone and the heat exchanger means to reduce the temperature of the combustion gas to below about 1150K and from a cooled combustion gas, and, recycling a portion of the cooled combustion gas to be combined with oxygen for the combustion zone.
Claim 3
Dependent Claim
22 words
The process of claim 1 including the step of removing a portion of the recycled cooled combustion gas as the cooling gas.
Claim 4
Dependent Claim
24 words
The process of claim 2 including the step of controlling the ratio of CO 2 /O 2 to develop combustion temperatures above about 2000K.
Claim 5
Dependent Claim
34 words
The process of claim 3 including the step of introducing an alkali metal based compound to the combustion zone to combine in a gas-gas reaction with sulfur oxide and form an alkaki metal sulfate.
Claim 6
Dependent Claim
26 words
The process of claim 3 wherein the step of controlling the ratio of CO 2 /O 2 provides a ratio in the range of about 1.5-2.0.
Claim 7
Dependent Claim
29 words
The process of claim 5 wherein the step of introducing a cooling gas of carbon dioxide provides a CO 2 /O 2 ratio in the range of about 2.2-2.5.
Claim 8
Dependent Claim
37 words
The process of claim 4 including the step of removing at least a portion of water, alkali metal sulfate, nitrogen oxide, or mixtures thereof from the remaining combustion gas following or before removal of the recycled gas.
Claim 9
Dependent Claim
29 words
The process of claim 4 including the step of using the remaining combustion gas following removal of the recycled gas for a source of CO 2 for oil recovery.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-01-11 | 1991-07-13 | 1992-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-11 | 1995-07-13 | 1996-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-11 | 1999-07-13 | 2000-01-12 | $7700.00 | Window Closed / Lapsed |