Sulfidation of Fe2O3-SiO2 particles in coal gas from air blown gasifiers

Citation
H. Shirai et al., Sulfidation of Fe2O3-SiO2 particles in coal gas from air blown gasifiers, KAG KOG RON, 27(1), 2001, pp. 85-92
Citations number
15
Language
GIAPPONESE
art.tipo
Article
Categorie Soggetti
Chemical Engineering
Journal title
KAGAKU KOGAKU RONBUNSHU
ISSN journal
0386-216X → ACNP
Volume
27
Issue
1
Year of publication
2001
Pages
85 - 92
Database
ISI
SICI code
0386-216X(200101)27:1<85:SOFPIC>2.0.ZU;2-K
Abstract
Fe2O3-SiO2 particles, which removes H2S and COS in hot coal gas, are prepar ed. The characteristics of sulfidation are studied using simulated coal gas from an air blown gasifier. In the temperature range of 623 K to 973 K, the conversion rate of Fe2O3-Si O2 particle to iron sulfide was slowest at 823 K where Fe2SiO4 is formed at reduction before sulfidation. At lower than 823 K, the stable formation is Fe3O4. The conversion rate is of first order in H2S concentration. At more than 823 K. however sulfidation does not proceed in lower H2S concentratio n than 1,000 ppm-2,500 ppm levels. At temperature 823 K, this concentration is lower than 2,460 ppm, which is higher than the equilibrium concentratio ns (175 ppm). In the temperature ranges from 673 K to 823 K and from 923 K to 973 K. sulf idation is controlled by pore diffusion under Knudsen diffusion regime. Thi s result shows that sulfidation has the influence of the change of pore rad ius of Fe2O3-SiO2 particle at reduction.