2000 Volume 79 Issue 11 Pages 1070-1077
Influence of alkali metal compounds on desulfurization characteristics of sea-shell and limestone was elucidated quantitatively by using a thermobalance in this study. Scallop removed alkali metals and chlorine and Tsukumi limestone added several alkali metal compounds and chlorides were used as a sample. In order to elucidate additive effect of sodium chloride into the limestone on the desulfurization characteristics, the mean pore size by a pore sizer, the sulfur distribution within a reacting particle by an EDX system and the crystal structure of particles by a XRD system were measured.
As a result, the desulfurization efficiency for the scallop even after removing the alkali metals and chlorine little changed. The addition of sodium chloride into the limestone can increase the desulfurization efficiency best. Both the mean pore size and the crystal structure of the calcined limestone, into which sodium chloride was added, was similar to those of the calcined scallop.Thus the desulfurization reaction produced over the whole of a particle. However, even if sodium chloride was added into the calcined limestone (CaO), the desulfurization efficiency was not promoted.