Energy Sources Part A-recovery Utilization and Environmental Effects, Vol.39, No.2, 166-171, 2017
Effect of additives on limestone reactivity in flue gas desulfurization
In this article, the influence of temperature, stirring speed, limestone type, particle size, and desulfurization additives on the limestone dissolution rate was investigated. The dissolution reaction was modeled by shrinking-core model. As the temperature increases, the dissolution reaction rate increased rapidly, and the activation energy was 25.76 kJ/mol. The relation between reaction rate constant and stirring speed was obtained to be k = 0.0205 degrees.(511). When the CaCO3 content of limestone was higher, the improving effect of reducing particle size on dissolution rate will be more significant. Sulfates were found to inhibit the limestone dissolution, while magnesium salts were found to improve the dissolution.
Keywords:Conversion rate;desulphurization additives;limestone dissolution;shrinking-core model;WFGD process