Catalytic iron oxide for lime regeneration in carbonaceous fuel combustion

Patent · Tue Sep 30 00:00:00 EDT 1980

OSTI ID:6543435

Shen, M; Yang, R T

Lime utilization for sulfurous oxides absorption in fluidized combustion of carbonaceous fuels is improved by impregnation of porous lime particulates with iron oxide. The impregnation is achieved by spraying an aqueous solution of mixed iron sulfate and sulfite on the limestone before transfer to the fluidized bed combustor, whereby the iron compounds react with the limestone substrate to form iron oxide at the limestone surface. It is found that iron oxide present in the spent limestone acts as a catalyst to regenerate the spent limestone in a reducing environment. With only small quantities of iron oxide the calcium can be recycled at a significantly increased rate.

• Assignee: Department of Energy
• Patent Number(s): US 4225572
• OSTI ID: 6543435
• Resource Relation: Patent File Date: Filed date 29 Sep 1978; Other Information: PAT-PPL-947664
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
20 FOSSIL-FUELED POWER PLANTS
ADSORBENTS
AIR POLLUTION CONTROL
REGENERATION
COAL
FLUIDIZED-BED COMBUSTION
FLUE GAS
DESULFURIZATION
IRON OXIDES
CATALYTIC EFFECTS
CATALYSTS
FOSSIL-FUEL POWER PLANTS
LIMESTONE
SULFUR OXIDES
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION
ENERGY SOURCES
FOSSIL FUELS
FUELS
GASEOUS WASTES
IRON COMPOUNDS
MATERIALS
OXIDATION
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
POWER PLANTS
ROCKS
SEDIMENTARY ROCKS
SULFUR COMPOUNDS
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
200202 - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions