Catalytic iron oxide for lime regeneration in carbonaceous fuel

Details Catalytic iron oxide for lime regeneration in carbonaceous fuel Catalytic iron oxide for lime regeneration in carbonaceous fuel

1978-09-29

1980-09-30

Vertiz, O. R.

Chemistry of inorganic compounds

Oxygen or compound thereof

Metal containing

423244, 423635, C01B 1314, C01F 502, C01B 1700

Patent

active

042255724

ABSTRACT:
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.

REFERENCES:
patent: 3729551 (1973-04-01), Gorin
patent: 3781408 (1973-12-01), Lin
patent: 3784676 (1974-01-01), Moss
Colussi et al., "Thermal Decomposition of Calcium Sulfate", il Cemento, vol. 71, pp. 75-98 (1974).

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