US4649034A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyzed flue gas desulfurization
Assignee: C0NSOLIDATION COAL Co
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Filing: 1985-06-14
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Granted: 1987-03-10
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Expires: 2005-06-14
Abstract
Abstract Flue gas resulting from combustion of sulfur-containing fuel is treated for reduction of its sulfur dioxide content by creating in it a suspension of finely divided sorbent such as lime, and then contacting it at elevated temperature in a vertical contacting zone with a descending shower of sulfur dioxide oxidation catalyst. The resulting sulfur trioxide is captured as a powdered sulfate.
Inventors
- 👤 Gerald D. Rutledge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:42
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/08; B01J8/12; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/508; B01D53/74; B01D53/86; B01D53/8603; B01D53/8609
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
177 words
The method of reducing sulfur dioxide content of flue gas generated by combustion of sulfur-containing fuel which comprises: (a) passing said flue gas containing molecular oxygen at a temperature of at least about 415° C. into a first end of a vertically elongated boiler convection zone; (b) introducing into an upper end of said boiler convection zone a shower of dry particulate oxidation catalyst, said catalyst passing through said boiler convection zone co-currently with exiting gases; (c) removing from a lower end of said boiler convection zone a stream comprising said oxidation catalyst; (d) returning a portion of the removed stream of step (c) to the step of introducing in step (b); (e) providing finely divided dry lime, quicklime, limestone or dolomite sulfur trioxide getter to said flue gas at a point proximate to said first end of said boiler convection zone; and (f) removing from a second end of said boiler convection zone a stream comprising flue gas of diminished sulfur dioxide content carrying a suspension of finely divided reaction product of getter and sulfur trioxide.
Claim 2
Independent Claim
177 words
The method of reducing sulfur dioxide content of flue gas generated by combustion of sulfur-containing fuel which comprises: (a) passing said flue gas containing molecular oxygen at a temperature of at least about 415° C. into a first end of a vertically elongated boiler convection zone; (b) introducing into an upper end of said boiler convection zone a shower of dry particulate oxidation catalyst, said catalyst passing through said boiler convection zone co-currently with exiting gases; (c) removing from a lower end of said boiler convection zone a stream comprising said oxidation catalyst; (d) returning a portion of the removed stream of step (c) to the step of introducing in step (b); (e) providing finely divided dry lime, quicklime, limestone or dolomite sulfur trioxide getter to said flue gas at a point proximate to said first end of said boiler convection zone; and (f) removing from a second end of said boiler convection zone a stream comprising flue gas of diminished sulfur dioxide content carrying a suspension of finely divided reaction product of getter and sulfur trioxide.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein said first end comprises said upper end, and said second end comprises said lower end.
Claim 4
Dependent Claim
21 words
The method of claim 1 wherein said first end comprises said lower end, and said second end comprises said upper end.
Claim 5
Dependent Claim
21 words
The method of claim 2 wherein said providing of step (e) comprises injecting getter into said flue gas at said point.
Claim 6
Dependent Claim
22 words
The method of claim 2 wherein said providing of step (e) comprises injecting calcium carbonate into a region proximate to said combustion.
Claim 7
Dependent Claim
34 words
The method of claim 2 wherein said oxidation catalyst is of a size consist primarily larger than about 16 mesh, and said getter is of a size consist primarily smaller than about 200 mesh.
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) | 1990-03-09 | 1990-09-08 | 1991-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-09 | 1994-09-08 | 1995-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-09 | 1998-09-08 | 1999-03-10 | $7700.00 | Window Closed / Lapsed |