US4351804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sulfur dioxide scrubber with hydroclone separator
Assignee: Hamon Research Cottrell SA
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Filing: 1980-04-08
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Granted: 1982-09-28
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Expires: 2000-04-08
Abstract
Abstract Sulfur dioxide is scrubbed from boiler flue gases in a double-loop alkali scrubber, one a quencher loop and the other an absorption loop. Preferably, the reagent flow of the two loops is isolated so that none of the reagent from the quencher loop is cycled to the absorber loop. A substantial portion of the make-up water for the quencher loop is received from the absorber loop and solids are concentrated in a dewatering system which includes a hydroclone.
Inventors
- 👤 Edward L. Biedell
- 👤 Robert J. Ferb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 12:45
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
188 words
Apparatus for removing sulfur dioxide from flue gas comprising: a quencher-absorber tower; a flue gas quencher; and a flue gas scrubber serially mounted in said tower; a flue gas inlet for said tower in communication with said flue gas quencher; gas outlet means for said tower in communication with the flue gas scrubber; means for serially passing the flue gas first through the quencher and then through the scrubber; an alkali reagent water slurry; means for serially contacting the gas first in the quencher and then in the scrubber with the alkali/water slurry; dewatering means for a portion of the partially spent alkali reagent water slurry; said dewatering means comprising a hydroclone, a tangential inlet at the upper end of the hydroclone, a bottom outlet for discharging heavy particles from the hydroclone, a vortex finder mounted in the upper end of the hydroclone forming the light fraction discharge from the hydroclone, a slurry feed control valve for the tangential inlet, a heavy particle control valve for the bottom outlet and means for directing the lighter fraction discharged from the hydroclone into the alkali/water slurry for the gas quencher.
Claim 2
Dependent Claim
188 words
Apparatus for removing sulfur dioxide from flue gas comprising: a quencher-absorber tower; a flue gas quencher; and a flue gas scrubber serially mounted in said tower; a flue gas inlet for said tower in communication with said flue gas quencher; gas outlet means for said tower in communication with the flue gas scrubber; means for serially passing the flue gas first through the quencher and then through the scrubber; an alkali reagent water slurry; means for serially contacting the gas first in the quencher and then in the scrubber with the alkali/water slurry; dewatering means for a portion of the partially spent alkali reagent water slurry; said dewatering means comprising a hydroclone, a tangential inlet at the upper end of the hydroclone, a bottom outlet for discharging heavy particles from the hydroclone, a vortex finder mounted in the upper end of the hydroclone forming the light fraction discharge from the hydroclone, a slurry feed control valve for the tangential inlet, a heavy particle control valve for the bottom outlet and means for directing the lighter fraction discharged from the hydroclone into the alkali/water slurry for the gas quencher.
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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) | 1985-09-27 | 1986-03-29 | 1986-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-09-27 | 1990-03-29 | 1990-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-09-27 | 1994-03-29 | 1994-09-28 | $7700.00 | Window Closed / Lapsed |