US4559211A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for reduced temperature operation of flue gas collectors
Assignee: Hamon Research Cottrell SA
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Filing: 1984-04-13
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Granted: 1985-12-17
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Expires: 2004-04-13
Abstract
Abstract A method for reduced temperature operation of flue gas collectors is disclosed wherein the benefits of low temperature operation are made possible by avoidance of the acid dewpoint limit. The process increases the specific collecting area of the collector, results in lower pressure drop through the collector and, where the collector is an electrostatic precipitator, allows improved collection efficiency through higher electric field strength and reduced particulate resistivity.
Inventors
- 👤 Paul L. Feldman
- 👤 Robert J. Gleason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 00:57
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501; B03; B03C; B03C3/00; B03C3/01; B03C3/013; B03C3/014; F; F23; F23J; F23J15/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
132 words
A method for reduced temperature operation of flue gas particulate collection comprising eliminating sulfur trioxide from hot flue gas by treating the flue gas with an alkali material to thereby lower the acid dewpoint; thereafter cooling the flue gas top about 140° F. to about 250° F. and then subjecting the cooled flue gas to particulate gas to particulate collection, wherein the cooling of the flue gas is accomplished by evaporation of water injected as a spray of very fine droplets less than 50 microns in diameter into the flue gas downstream of the alkali treatment, wherein the alkali material is a finely divided compound selected from the group comprising lime, limestone, dolomite, sodium carbonate, sodium bicarbonate, Trona and Nahcolie and wherein the alkali material is injected as a solution or slurry.
Claim 2
Independent Claim
132 words
A method for reduced temperature operation of flue gas particulate collection comprising eliminating sulfur trioxide from hot flue gas by treating the flue gas with an alkali material to thereby lower the acid dewpoint; thereafter cooling the flue gas top about 140° F. to about 250° F. and then subjecting the cooled flue gas to particulate gas to particulate collection, wherein the cooling of the flue gas is accomplished by evaporation of water injected as a spray of very fine droplets less than 50 microns in diameter into the flue gas downstream of the alkali treatment, wherein the alkali material is a finely divided compound selected from the group comprising lime, limestone, dolomite, sodium carbonate, sodium bicarbonate, Trona and Nahcolie and wherein the alkali material is injected as a solution or slurry.
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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) | 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 |