Reducing sulfur content in flue gases produced by coal combustion

Patent · Tue Feb 24 04:00:00 EST 1987

OSTI ID:6698004

Barczak, V J

A process is described for reducing the gaseous sulfur oxide content of flue gases comprising the steps of: burning in a combustion zone coal containing weakly bound cations of one of the alkali metal and alkaline earth metals or combinations thereof in ion exchangeable form thereby producing flue gases. The burning of such coal in the combustion zone causes a substantial portion of the sulfur dioxide in the coal to be converted to sulfates in a residue in the combustion zone thereby reducing the amount of gaseous sulfur dioxide in the flue gases produced in the combustion zone; recovering the sulfate containing residue from the combustion zone; contacting at least a portion of the flue gases with coal containing weakly bound cations of one of the alkali metal and alkaline earth metals or combinations thereof in ion exchangeable form in a scrubbing zone to sorb a portion of the sulfur dioxide in the contacted flue gases on the coal; and combusting in the combustion zone the coal contacted by the flue gases in the scrubbing zone.

• Assignee: Kerr McGee Coal Corp., Oklahoma City, OK
• Patent Number(s): US 4645654
• OSTI ID: 6698004
• 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
ADDITIVES
ADSORPTION
AIR POLLUTION CONTROL
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION PRODUCTS
CONTROL
DESULFURIZATION
ENERGY SOURCES
FLUE GAS
FOSSIL FUELS
FUELS
GASEOUS WASTES
ION EXCHANGE
MATERIALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
SCRUBBING
SORPTION
SULFATES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
WASTES