Process for treating coal to reduce sulfur content in flue gases produced by coal combustion

Patent · Tue Oct 27 04:00:00 EST 1987

OSTI ID:5865587

Barczak, V J; Baldwin, R A; Graham, P R

A process for reducing the gaseous sulfur oxide content of flue gases is described 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, in the presence of water to maintain, during such contacting, a relatively high moisture content, the moisture content in the coal being from at least about 5% to about 60% by weight; 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 4702899
• OSTI ID: 5865587
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
ALKALI METALS
ALKALINE EARTH METALS
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COMBUSTION
COMBUSTION CONTROL
COMBUSTION KINETICS
CONTROL
DESULFURIZATION
ELEMENTS
ENERGY SOURCES
FLUE GAS
FOSSIL FUELS
FUELS
GASEOUS WASTES
ION EXCHANGE
KINETICS
MATERIALS
METALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REACTION KINETICS
REMOVAL
SCRUBBING
SULFUR COMPOUNDS
SULFUR CONTENT
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
WASTES