Method and apparatus for reducing sulfur dioxide content in flue gases

Patent · Tue Sep 17 04:00:00 EDT 1991

OSTI ID:5586402

Landreth, R R; Anderson, L R

This patent describes improvement in a combustion process wherein a sulfur containing fuel is introduced into a first zone of a combustion chamber, and wherein combustion air is introduced into the first zone or is introduced both into the first zone of the chamber downstream of the first zone, to produce downstream-flowing combustion reaction gases containing sulfur dioxide (SO{sub 2}), and wherein finely divided particles of a material calcineable into lime are inducted through an entry into the second zone in sufficient amount to reduce substantially the SO{sub 2} content of the combustion reaction gases. The improvement comprises: transporting a mixture of the particles and a carrier gas up to a location further from the entry than adjacent thereto, under a s dense phase transport in which the solids to gas ratio is at least about 20 to 1; the carrier gas being incapable of distributing the particles across the zone; and then adding to the mixture, at the location an additional gas volume, not employed in the dense phase transport.

• Assignee: Inland Steel Co., Chicago, IL (United States)
• Patent Number(s): US 5048431; A
• Application Number: PPN: US 7-548183
• OSTI ID: 5586402
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
014000 -- Coal
Lignite
& Peat-- Combustion
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
COMBUSTION CHAMBERS
CONTROL
DESULFURIZATION
EQUIPMENT
FLUE GAS
GASEOUS WASTES
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POLLUTION CONTROL EQUIPMENT
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
WASTES