鉄・亜鉛系酸化物脱硫剤の高温下におけるH₂S除去特性

抄録

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.