Abstract：A lab scaling wet flue gas desulfurization ( WFGD) experiment device was designed according to the actual operation. The experimental influences of main operating parameters ( flue gas temperature, SO₂concentration, flue gas quantity, the ratio of calcium to sulfur, spray layer numbers and tray bore diameters, etc.) on desulfurization efficiency were investigated. According to the results of the study, the process of flue gas desulfurization was designed for 2 × 220 t/h boiler in China Aluminum Branch. The concentration of sulfur dioxide emissions was 30. 9 mg/Nm³with the desulfurization efficiency of 97. 5%, which met the ultra-low requirement of flue gas emissions in power plant boiler.

Keyword：coal-fired boiler;wet flue gas desulfurization;lab scaling;ultra-low emission;desulfurization efficiency;