Experimental Study on Reactivity of Limestone in FGD System

Abstract

The limestone collected from the Ji county of Tianjin was investigated in this study. The characterization of the limestone dissolution in wet FGD system is carried out by sulfuric acid titration. The results indicate that A lower PH value is benefit for the limestone dissolution, which causes high dissolution rate within short time. Smaller particle size results in higher dissolution rate. The addition of inorganic salt and organic acid significantly affect the limestone dissolution. The limestone dissolution rate increases with the increase of organic acid concentration. In all the inorganic salt, it is obvious that Na+ has an positive effect while CI- plays a negative role on the limestone dissolution. However, the addition of composite additive of adipic acid plus MgO to the limestone slurry is greatly better than using the adipic acid or MgO only.

Enhanced Wet Flue Gas Desulfurization Properties by Additives of Organic Acids, Organic Salts, Inorganic Salts, and Organic Amines

“…The core of these chemical reactions is to promote the dissolution of CaCO 3 and oxidation and crystallization of CaSO 3 . − The synergistic mechanism of the composite additive in the desulfurization process was speculated. The composite additive (CA-3) contains acetic acid, sodium benzoate, sodium acetate, and MgSO 4 .…”