US4600569A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flue gas desulfurization process
Assignee: Consolidation Coal Co
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Filing: 1985-03-22
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Granted: 1986-07-15
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Expires: 2005-03-22
Abstract
Abstract An aqueous solution of an alkaline earth salt of a low molecular weight carboxylic acid, such as calcium formate, is sprayed into a sulfur dioxide containing flue gas upstream of a solids particulate separator in amount sufficient to produce a flue gas temperature at least about 10° C. above its dew point at the separator.
Inventors
- 👤 Heeyoung Yoon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 03:26
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
160 words
The method for reducing sulfur dioxide content of a flue gas resulting from combustion of a sulfur-containing fuel, which method comprises: (a) spraying into said flue gas, at a point where its temperature is between about 120° and about 230° C., an aqueous solution of a calcium salt of a low molecular weight carboxylic acid, said acid being selected from formic and acetic; (b) providing a contact time between said flue gas and droplets resulting from said spraying of at least about 1 second; (c) subsequently separating from said flue gas solids resulting from drying of said droplets and solids resulting from combustion of said fuel; (d) discharging from said separating a flue gas of substantially diminished sulfur dioxide content; and (e) regulating the rate of said spraying relative to the rate of said flue gas such that the temperature of said flue gas at the point of said separating is at least about 10° C. above its saturation temperature.
Claim 2
Independent Claim
160 words
The method for reducing sulfur dioxide content of a flue gas resulting from combustion of a sulfur-containing fuel, which method comprises: (a) spraying into said flue gas, at a point where its temperature is between about 120° and about 230° C., an aqueous solution of a calcium salt of a low molecular weight carboxylic acid, said acid being selected from formic and acetic; (b) providing a contact time between said flue gas and droplets resulting from said spraying of at least about 1 second; (c) subsequently separating from said flue gas solids resulting from drying of said droplets and solids resulting from combustion of said fuel; (d) discharging from said separating a flue gas of substantially diminished sulfur dioxide content; and (e) regulating the rate of said spraying relative to the rate of said flue gas such that the temperature of said flue gas at the point of said separating is at least about 10° C. above its saturation temperature.
Claim 3
Dependent Claim
11 words
The method of claim 1 wherein said salt comprises calcium formate.
Claim 4
Dependent Claim
33 words
The method of claim 2 wherein additionally sorbent selected from calcium formate, oxide, and hydroxide is introduced in dry finely divided form into said flue gas at a point upstream of said spraying.
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) | 1989-07-14 | 1990-01-13 | 1990-07-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-14 | 1994-01-13 | 1994-07-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-14 | 1998-01-13 | 1998-07-15 | $7700.00 | Window Closed / Lapsed |