Characteristics of H2S Removal of Mixed-oxide Sorbents Containing Fe and Zn at High Temperatures
1998 Volume 77 Issue 11 Pages 1100-1110
Details
1998 Volume 77 Issue 11 Pages 1100-1110
An integrated coal gasification molten carbonate fuel cells power generation system (IG-MCFC) has higher thermal efficiency than an integrated coal gasi-fication combined cycle power generation system (IGCC). In IG-MCFC, it is necessary to remove sulfur compounds (H2S, COS) so that there are less than 1 ppm. Iron oxide sorbents developed in IGCC can not achieve this. New sorbents need to be developed for this reason.
A zinc element has high ability for sulfur removal to less than 1 ppm. We prepared mixed oxide sorbents containing iron and zinc, and evaluated the characteristics of H2S removal.
1. A zinc element, which was added to the sorbents as zinc ferrite (ZnFe204), had the highest reactivity.
2. Silica added to zinc ferrite had much effect on protecting of carbon depositions.
3. Zinc ferrite sorbents could remove H2S down to less than 1 ppm.
4. Zinc ferrite sorbents after regeneration couldalso have less than 1 ppm.
5. The sorbents' desulfurization performance after regeneration was influenced by change of the specific surface area caused by regeneration.
