Catalytic iron oxide for lime regeneration in carbonaceous fuel combustion
US4225572A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 29, 1978 |
| Grant date | Sep 30, 1980 |
| Priority date | — |
| Expiry date | Sep 29, 1998 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P20/584
- WIPO fieldChemical engineering
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.