US4322393A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for drying calcium chloride generated in high chloride flue gas desulfurization systems
Assignee: Hamon Research Cottrell SA
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Filing: 1980-11-17
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Granted: 1982-03-30
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Expires: 2000-11-17
Abstract
Abstract Some flue gas desulfurization processes applied to fuels containing high chloride concentrations are utilizing, or plan to utilize, by-product gypsum from the process stream. The utilization of such a process results in a calcium chloride buildup in the flue gas desulfurization system from fuels or water resource containing significant chlorides which interferes with the absorption and utilization of the lime or limestone reagent. In this invention, a method is used to convert the calcium chloride to a dry material by utilizing flue gas at elevated temperatures, normally found before an air preheater on steam generators used to produce power or any other conventional large size steam boilers. The monohydrate is produced at temperatures above 350 DEG F. By applying this drying process with a power plant system, energy consumed for this drying operation is very efficient.
Inventors
- 👤 Robert J. Gleason
- 👤 Chin T. Sui
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 18:23
CPC Classifications
C; C01; C01F; C01F11/00; C01F11/20; C01F11/24; C01F11/30; B; B01; B01D; B01D53/00; B01D53/34; B01D53/46; B01D53/48; B01D53/50; B01D53/501; B01D53/68; C01F11/46; C01F11/464; Y; Y02; Y02P; Y02P20/00; Y02P20/10; Y02P20/129
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
105 words
A process for drying calcium chloride generated in high chloride content flue gas desulfurization systems comprising the steps: 1. by-passing a portion of hot combustion gas containing SO 2 and chlorides to a spray dryer; 2. directing a concentrated calcium chloride brine to the spray dryer; 3. removing dry predominately calcium chloride from the spray dryer; 4. redirecting the by-passed gas to the main gas stream; 5. directing the gas stream serially through a gas cleaner and a gas quencher-scrubber; 6. directing a limestone slurry to the gas quencher-scrubber to react with the SO 2 and the chlorides to form calcium sulfate and calcium chloride;
Claim 2
Dependent Claim
105 words
A process for drying calcium chloride generated in high chloride content flue gas desulfurization systems comprising the steps: 1. by-passing a portion of hot combustion gas containing SO 2 and chlorides to a spray dryer; 2. directing a concentrated calcium chloride brine to the spray dryer; 3. removing dry predominately calcium chloride from the spray dryer; 4. redirecting the by-passed gas to the main gas stream; 5. directing the gas stream serially through a gas cleaner and a gas quencher-scrubber; 6. directing a limestone slurry to the gas quencher-scrubber to react with the SO 2 and the chlorides to form calcium sulfate and calcium chloride;
Claim 3
Dependent Claim
34 words
removing calcium sulfate from the spent limestone slurry from the quencher-scrubber and directing the remainder of the calcium chloride containing slurry to a brine concentrator and dust collector, and then to the spray dryer.
Claim 4
Dependent Claim
34 words
removing calcium sulfate from the spent limestone slurry from the quencher-scrubber and directing the remainder of the calcium chloride containing slurry to a brine concentrator and dust collector, and then to the spray dryer.
Claim 5
Dependent Claim
60 words
The process defined in claim 1 further including the steps: (a) directing the by-passed gas issuing from the spray dryer to the brine concentrator and dust collector and thereafter redirecting the by-passed gas to the main gas stream; and wherein the concentrated calcium chloride brine directed to the spray dryer is first concentrated in the brine concentrator and dust collector.
Claim 6
Dependent Claim
23 words
The process defined in claim 2 wherein the brine concentrator is provided with a calcium chloride containing effluent slurry from a vacuum filter.
Claim 7
Dependent Claim
22 words
The process defined in claim 3 wherein the vacuum filter is fed with the spent limestone slurry from the flue gas quencher-scrubber.
Claim 8
Dependent Claim
17 words
The process defined in claim 4 wherein the vacuum filter separates gypsum from the spent limestone slurry.
Claim 9
Dependent Claim
26 words
The process defined in claim 1 wherein the concentrated calcium chloride directed to the spray dryer is first concentrated in the brine concentrator and dust collector.
Claim 10
Dependent Claim
23 words
The process defined in claim 6 where the brine concentrator is provided with a calcium chloride containing effluent slurry from a vacuum filter.
Claim 11
Dependent Claim
22 words
The process defined in claim 7 wherein the vacuum filter is fed with the spent limestone slurry from the flue gas quencher-scrubber.
Claim 12
Dependent Claim
17 words
The process defined in claim 8 wherein the vacuum filter separates gypsum from the spent limestone slurry.
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) | 1985-03-29 | 1985-09-28 | 1986-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-03-29 | 1989-09-28 | 1990-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-03-29 | 1993-09-28 | 1994-03-30 | $7700.00 | Window Closed / Lapsed |