Lime: theoretical concepts of active lime, is a chemical properties and lively, strong ability to participate in the reaction, containing S (sulfur), low P (phosphorus) and other harmful impurities. It has the following main characteristics: volume density, porosity, large surface area, the reaction performance. It also has: CaO crystal fine: ≤1 wm Shanxi limestone powder, CaO content: ≥90% Hebei limestone powder, S, low P content: <0.02% and traces, SiO2 + Fe2O3 + Al2O3 content is low: <2% Anyang limestone powder residual CO2 Low: ≤2% lighter and other characteristics of burnt lime. Influence of Limestone Flour for wet flue gas desulfurization performance: from the wet desulfurization process can be seen in the main reaction limestone powder, to absorb and neutralize flue gas SO2, the key is the formation of Ca2 +, which and limestone or limestone powder The component (mainly CaCO3 content), fineness, reactivity, etc. are closely related. Quality limestone has a direct impact on the performance of wet flue gas desulfurization.