Process for the desulfurization of flue gases

Patent · Tue May 13 00:00:00 EDT 1980

OSTI ID:5516403

Lurie, D

Flue gas having a content of sulfur dioxide is passed upwardly through a scrubbing tower against a descending flow of recycled aqueous sodium aluminate-sodium hydroxide liquor. The sulfur dioxide in the gas is converted to sodium and aluminum sulfates and sulfites and the liquor removes any fly ash present in the gas. Underflow is continuously discharged from the tower and is sent to an evaporator for removal of excess water. Make-up solutions of sodium hydroxide, sodium sulfate and aluminum sulfate are added, as necessary. Carbonaceous reducing agent is added to the discharge from the evaporator. The mixture is continuously fed into a reducing furnace where the sulfates and sulfites are reduced to sulfides. The product of the furnace (Molten sodium and aluminum sulfides) is charged into a continuous hydrolyzer. Hydrogen sulfide is evolved and collected, and, if desired, its sulfur content is converted to elementary sulfur. The underflow from the hydrolyzer is filtered. The filtrate is aqueous sodium aluminate-sodium hydroxide solution which is recycled to the scrubbing tower.

• Assignee: EDB-82-094372
• Patent Number(s): US 4202869
• OSTI ID: 5516403
• Resource Relation: Patent File Date: Filed date 9 May 1978; Other Information: PAT-APPL-904329
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
01 COAL, LIGNITE, AND PEAT
FLUE GAS
DESULFURIZATION
FLY ASH
REMOVAL
SULFUR DIOXIDE
AIR POLLUTION CONTROL
ALUMINATES
ALUMINIUM SULFATES
AQUEOUS SOLUTIONS
CARBONACEOUS MATERIALS
COUNTERFLOW SYSTEMS
FILTRATION
HYDROLYSIS
MATERIALS RECOVERY
REDUCTION
SCRUBBING
SODIUM COMPOUNDS
SODIUM HYDROXIDES
SODIUM SULFATES
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ASHES
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DECOMPOSITION
DISPERSIONS
GASEOUS WASTES
HYDROGEN COMPOUNDS
HYDROXIDES
LYSIS
MANAGEMENT
MATERIALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
PROCESSING
RECOVERY
RESIDUES
SEPARATION PROCESSES
SOLUTIONS
SOLVOLYSIS
SULFATES
SULFUR COMPOUNDS
SULFUR OXIDES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions
010800 - Coal
Lignite
& Peat- Waste Management