A Study of Experimental and Improved Absorption Model for the Spray Towers of Wet Flue Gas Desulfurization

Abstract

The wet flue gas desulfurization has been the most widely used in the coal-fired power plants because of high SO2removal efficiency, reliability and low utility consumption. A mathematical model of limestone/gypsum wet flue gas desulfurization (WFGD) system was developed based on the two-film theory of mass-transfer. In the one-dimensional two-film theory , the concentration of SO2in the bulk of the liquid(cAs) is difficult to accurately determine. The authors derive the accurate calculation of the value of cAs on the basis of the one-dimensional mass transfer model, making the model in line with the actual process. The model predictions were verified by experimental data. Experimental investigations of the effects of different operating variables on the SO2removal showed the reasonable process parameters such as the pH value of the liquid phase, droplet size of the spray and the flow rates of liquid and gas. Keep the slurry flow in a 50 ml/min, adjust the flue gas flow changes. Keep the flue gas flow in 5 l/min, adjust the flow slurry changes. The experimental results reveal that the model can describe the processes in this absorber well. Some experimental parameters (temperature, flue gas velocity) are difficult to accurately control, the model can give them fluence on the desulfurization efficiency.