H2S Reactions with Limestone and Calcined Limestone

JOURNAL OF CHEMICAL ENGINEERING OF JAPAN

Masayuki Horio¹  Hitoki Matsuda²  Masanobu Hasatani²  Ali Al-Shawabkeh²  Shi-Ying Lin² 

[1]Department of Chemical Engineering, Tokyo University of Agriculture and Tecnology

[2]Department of Energy Engineering & Science/Chemical Engineering, Nagoya University

关键词: Desulfurization;    Hydrogen Sulfide;    Limestone;    Coal Gasification;    Carbon Dioxide;   

DOI  :  10.1252/jcej.28.708

来源: Maruzen Company Ltd

【 摘 要 】

References(18)Cited-By(5)Sulfur capture reactions of CaCO3-H2S and CaO-H2S have been investigated under various gaseous mixtures conditions using limestone and calcined limestone of 1 mm diameter in a thermogravimetric analyzer.Sulfidation of limestone (CaCO3-H2S) had a very low initial reaction rate and final conversion than the sulfidation of calcined limestone (CaO-H2S) due to its product layer having less porosity than those produced by calcined limestone. The products (CaS) produced by sulfidation of limestone have larger grain size and lower specific surface area than those produced by calcined limestone. Both suffidation reactions of limestone and calcined limestone were first order with respect to H2S partial pressure. The presence of CO2 inhibited both the initial reaction rate and final conversion of sulfidation of calcined limestone. This was explained by the fact that CO2 accelerated sintering of CaO, and thus reduced the specific surface area of CaO. The initial sulfidation rate of limestone decreased linearly with increasing CO2 partial pressure. The initial reaction rates of both limestone and calcined limestone decreased with increasing steam partial pressure. The effect of steam on final conversion of sulfidation of calcined limestone was found to be insignificant. Only with the presence of CO2 was the sulfldation rate of calcined limestone appreciably reduced by H2 addition.

【 授权许可】

Unknown