Wet flue gas desulfurization using a physical mixture of limestone and lime for energy savings

Physical mixture of limestone and lime SOx absorbent was used to remove SO₂ in wet flue gas desulfurization system (WFGD) in this paper. The effects of varied running parameters such as slurry pH, molar ratio of CaO to (CaO and CaCO₃) and L/G ratio on removal efficiencies of SO₂ were investigated experimentally. The rational operation conditions were obtained, in which slurry pH was 6.0, molar ratio of CaO to (CaO and CaCO₃) was 0.25 and L/G ratio was 10L·m^-3. Taking the selected power plant as an example, system energy savings could be achieved by using the physical mixture of limestone and lime SOx absorbent and the better economic benefit was obtained.