Catalytic iron oxide for lime regeneration in carbonaceous fuel combustion

Patent · Tue Jan 01 00:00:00 EST 1980

OSTI ID:863671

Shen, Ming-Shing ^[1]; Yang, Ralph T ^[2]

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1. Rocky Point, NY
2. Middle Island, NY

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.

• Research Organization: Brookhaven National Laboratory (BNL), Upton, NY (United States)
• DOE Contract Number: EY-76-C-02-0016
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4225572
• OSTI ID: 863671
• Country of Publication: United States
• Language: English

Related Subjects

catalytic
iron
oxide
lime
regeneration
carbonaceous
fuel
combustion
utilization
sulfurous
oxides
absorption
fluidized
fuels
improved
impregnation
porous
particulates
achieved
spraying
aqueous
solution
mixed
sulfate
sulfite
limestone
transfer
bed
combustor
whereby
compounds
react
substrate
form
surface
found
spent
catalyst
regenerate
reducing
environment
quantities
calcium
recycled
significantly
increased
rate
carbonaceous fuels
iron sulfate
fluidized bed
aqueous solution
iron oxide
bed combustor
fuel combustion
carbonaceous fuel
reducing environment
significantly increased
fluidized combustion
form iron
sulfurous oxides
significantly increase
porous lime
lime particulates
lime utilization
/423/