Lime: lime quality requirements. Many detection methods for quality or degree of activity of the active lime. Among them, often with hydrochloric acid-based titration. And during calcination, buy lime powder, using comparative method hydration, hydration knock sample weighing method and sampling method to determine, analyze quality calcined lime is relatively quick and practical. Effect of limestone composition of wet flue gas desulfurization performance: Limestone other impurities on the stable operation of the wet FGD system will bring greater impact, lime sales, thereby reducing the performance of FGD systems. FGD system is running, although there will be an excess of limestone slurry was added, pH values ??still declining, the pH value of the loss of control of the phenomenon, lime, desulfurization efficiency will fall, that is, into the limestone slurry "blind spots" or "bad slurry. "