Experimental Study on Emission Characteristics of Particulate Matters from Wet Flue Gas Desulfurization System of a Coal-fired Power Plant

Particulate matters in areas before and after the wet flue gas desulphurization (WFGD) system of a 200 MW coal-fired power plant were collected at 100% and 80% boiler loads, so as to obtain the mass concentration and size distribution of particulate matters in the flue gas, and to detect the composition and content of elements involved by observing the morphology of above particulate matters. Results indicate that the mass concentration of total suspended particulate (TSP) is about 16 mg/m³ (in standard state) at the inlet of WFGD system, which is below 10 mg/m³ at the outlet, and the removal efficiency of TSP is 46.8%. The removal efficiency of particulate matters increase with the decrease of boiler load. Element calcium is found in the particulate matters at WFGD outlet, where irregular flocculation structures are formed through agglomeration and coagulation of particles. Under mist eliminator washing condition, the mass concentration of particulate matters decreases, and the content of elements Ca, S, C and O reduces obviously, when the particulate matters are mainly in round shape and dispersedly distributed.