US3635000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combustion gas scrubbing system
Assignee: Research Cottrell Inc
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Filing: 1970-03-13
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Granted: 1972-01-18
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Expires: 1990-03-13
Abstract
Abstract Suspended particulate matter, including sulfur-containing compounds of calcium and magnesium, and sulfur oxides are removed from combustion gases by passing the gases successively through a high-velocity venturi-type scrubber and a wetted film-packed bed scrubber. Scrubbing liquid from the venturi scrubber and from the packed bed scrubber may, after being clarified, be recirculated to the two scrubbing stages.
Inventors
- 👤 Robert F Brown
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:25
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
30 words
A method as claimed in claim 1, wherein the scrubbing liquid is heated to a temperature higher than that of the gas entering the second scrubber prior to recirculation therethrough.
Claim 2
Dependent Claim
132 words
Apparatus for removing particulate matter and sulfur oxide products with calcined limestone from combustion gases of sulfur-containing fuels comprising: A. a high velocity venturi-type first scrubber; B. a wetted film-packed bed second scrubber; C. a solid materials collecting and removing clarifier; D. conduit means for passing the combustion gases successively through said scrubbers; E. conduit means for conveying liquid and entrained particles from said scrubbers to said clarifier; F. recirculating conduit means for conveying clarified liquid from said clarifier separately to said first and second scrubbers; G. heating means for heating clarified liquid prior to recirculating to said scrubbers to prevent deposition of slightly soluble salts in said first and second scrubbers; and H. a fixed bed packing subsequent to said second scrubber for removing entrained liquid prior to discharging cleaned gas.
Claim 3
Dependent Claim
14 words
Apparatus as claimed in claim 3, wherein said first scrubber comprises a flooded-disc scrubber.
Claim 4
Dependent Claim
23 words
Apparatus as claimed in claim 4, wherein said second scrubber comprises a packed bed of high specific surface area and low pressure drop.
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) | 1975-01-17 | 1975-07-19 | 1976-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-17 | 1979-07-19 | 1980-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-17 | 1983-07-19 | 1984-01-18 | $7700.00 | Window Closed / Lapsed |