Flue gas desulfurization with oxidation of calcium sulfite in FGD discharges

Patent · Mon Dec 10 23:00:00 EST 1990

OSTI ID:5240754

Rathi, R J; Benson, L B

This paper discusses an improvement in a method of flue gas desulfurization. In the method a flue gas, containing sulfur dioxide, is contacted in a liquid scrubber unit with an aqueous slurry formed from calcium hydroxide and magnesium hydroxide. It contains magnesium hydroxide in an amount to provide an effective magnesium ion content of between 2500 to 9000 parts per million in the liquid scrubber unit. A portion of the slurry, after passage through the scrubber, contains undissolved calcium sulfite is recirculated through a thickener to produce an aqueous sludge containing calcium sulfite.

• Assignee: Dravo Lime Co., Pittsburgh, PA (USA)
• Patent Number(s): A; US 4976936
• Application Number: PPN: US 7-395667
• OSTI ID: 5240754
• 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
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CHEMICAL REACTIONS
CONTROL
DESULFURIZATION
EQUIPMENT
FLUE GAS
GASEOUS WASTES
OXIDATION
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SCRUBBERS
SCRUBBING
SULFITES
SULFUR COMPOUNDS
WASTES