US4876076A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of desulfurization
Assignee: Tampa Electric Co
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Filing: 1988-02-10
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Granted: 1989-10-24
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Expires: 2008-02-10
Abstract
Abstract In the desulfurization of flue gas utilizing limestone as absorbent in a double loop system, in which the flue gas is introduced into a quenching zone for contact with a first slurry of the limestone, and thereafter passes to an absorbing zone for further contact with a second limestone slurry, the two slurries being supplied from a mixing zone into which water and limestone are charged, and in which air is introduced into the quenching zone to convert the calcium sulfite present in it to gypsum, air is also supplied to the mixing zone to convert calcium sulfite in it to gypsum, and limestone is directly added to the quenching zone.
Inventors
- 👤 James D. Colley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:29
CPC Classifications
C; C01; C01B; C01B17/00; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501; B01D53/14; C01F; C01F11/00; C01F11/46; C01F11/464; C01P; C01P2004/00; C01P2004/60; C01P2004/61
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
137 words
In a process for the desulfurization of flue gas utilizing limestone as absorbent in a double loop system, wherein the flue gas is introduced into a quenching zone for contact with a first slurry of said limestone, and thereafter passes to an absorbing zone for further contact with a second slurry of said limestone, the said second slurry being supplied from a mixing zone into which water and limestone are charged, said first slurry being supplied from the solids rich stream from a solid-liquid separator which is supplied from said mixing zone, and wherein air is introduced into said quenching zone to convert the calcium sulfite present therein to gypsum, the improvement which comprises supplying air to said mixing zone to convert calcium sulfite therein to larger gypsum crystals which are preferentially separated into said first slurry.
Claim 2
Dependent Claim
137 words
In a process for the desulfurization of flue gas utilizing limestone as absorbent in a double loop system, wherein the flue gas is introduced into a quenching zone for contact with a first slurry of said limestone, and thereafter passes to an absorbing zone for further contact with a second slurry of said limestone, the said second slurry being supplied from a mixing zone into which water and limestone are charged, said first slurry being supplied from the solids rich stream from a solid-liquid separator which is supplied from said mixing zone, and wherein air is introduced into said quenching zone to convert the calcium sulfite present therein to gypsum, the improvement which comprises supplying air to said mixing zone to convert calcium sulfite therein to larger gypsum crystals which are preferentially separated into said first slurry.
Claim 3
Dependent Claim
19 words
A process as defined in claim 1, further comprising the step of directly adding limestone to said quenching zone.
References Cited (Backward Citations)
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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) | 1992-10-23 | 1993-04-24 | 1993-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-10-23 | 1997-04-24 | 1997-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-10-23 | 2001-04-24 | 2001-10-24 | $7700.00 | Window Closed / Lapsed |