US3722178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur trioxide vapor for dust conditioning
Assignee: Joy Manufacturing Co
•
Filing: 1971-06-24
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Granted: 1973-03-27
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Expires: 1991-06-24
Abstract
Abstract A process and apparatus for heating, vaporizing and decomposing sulfuric acid for production of sulfur trioxide to be used in conditioning stack gases to be treated in an electrostatic precipitator.
Inventors
- 👤 H Aaland
- 👤 J Ma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:56
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; B03C3/013
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
28 words
The method of preconditioning flue gas as specified in claim 1 wherein said stream of hot gases includes combustion products from hydrocarbon fuel and an excess of air.
Claim 2
Dependent Claim
28 words
The method of preconditioning flue gas as specified in claim 1 wherein the temperature of said stream of hot gases is in the range of 1,000* to 1,200*F.
Claim 3
Dependent Claim
30 words
The method of preconditioning flue gas as specified in claim 1 wherein the temperature Of said mixture is maintained with less than 250*F drop in temperature until said introducing step.
Claim 4
Dependent Claim
30 words
The method of preconditioning flue gas as specified in claim 1 wherein said flow of sulfuric acid is varied in relation to the amount of said flue gas being produced.
Claim 5
Dependent Claim
30 words
The method of preconditioning flue gas as specified in claim 5 wherein the amount of flue gas being produced is related to the electric power output of a power plant.
Claim 6
Dependent Claim
33 words
The method of preconditioning flue gas as specified in claim 1 comprising the additional step of conducting the combined flow of said flue gas and said mixture into at least one electrostatic precipitator.
Claim 7
Dependent Claim
36 words
The method of preconditioning flue gas as specified in claim 1 wherein said counter-current flow of hot air is upward through said vessel while the flow of said acid is downward by gravity through said vessel.
Claim 8
Dependent Claim
41 words
The method of preconditioning flue gas as specified in claim 1 wherein said measured flow of sulfuric acid is controlled to provide a ratio of said acid to said flue gas in the range of 5 to 50 parts per million.
Claim 9
Dependent Claim
27 words
The method of preconditioning flue gas as specified in claim 1 wherein said concentrated sulfuric acid is in the range of 92 to 98 percent pure acid.
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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |