Sulfur dioxide removal from flue gases with sulfite oxidation inhibition

Patent · Tue Dec 11 04:00:00 EST 1990

OSTI ID:5146764

Lee, Y J; Benson, L B

This paper discusses an improvement in a method for removal of sulfur dioxide from flue gases in a wet scrubber, wherein an aqueous alkaline earth metal component slurry is contacted in the wet scrubber with the flue gases and the slurry after the contact, containing sulfites and bisulfites, is passed to a recycle tank from which a portion thereof is discharged while the remainder is recycled to the wet scrubber. The improvement comprises: forming a mixture of calcium thiosulfate and calcium polysulfides by reaction of lime and emulsified sulfur; adding the mixture so formed to the recycle tank for reaction with the sulfites and bisulfites in the slurry so as to produce thiosulfates from the calcium polysulfides and provide 0.5 to 20 millimoles of thiosulfate per liter of liquid contained in the wet scrubber; and recycling the slurry from the recycle tank to the wet scrubber to remove sulfur dioxide from the flue gases.

• Assignee: Dravo Lime Co., Pittsburgh, PA (USA)
• Patent Number(s): A; US 4976937
• Application Number: PPN: US 7-462083
• OSTI ID: 5146764
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
20 FOSSIL-FUELED POWER PLANTS
200202 -- Fossil-Fueled Power Plants-- Waste Management-- Noxious Gas & Particulate Emissions
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
AIR POLLUTION CONTROL
CHALCOGENIDES
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
EQUIPMENT
FLUE GAS
GASEOUS WASTES
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
REMOVAL
SCRUBBERS
SCRUBBING
SULFITES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES