Membrane Absorption Of Flue Gas Desulfurization

The characteristics of FGD by hollow fiber membrane contactors have been widely investigated in this research. Under the experimental condition, the membrane's coefficient is equal to 16.7 10-3m/s, and the overall mass transfer coefficients are governed only by membrane's coefficient when feed gas velocity above 9m/s and the pH values of absorbing liquid above 10. Increasing the concentration of SO2 in flue gas, gas residence time, flux of absorbing liquid and the effective membrane area all will help to increase the desulfurization efficiency of modules. The removal fraction of SO2 would reach 99% under a certain experimental condition. Due to the function of second flow exist in helical tube, the desulfurization efficiency achieved in helical membrane contactor is about 4%~10% higher than that achieved in straight one. There are also some relationships between removal fraction of S02 and the configuration parameters of helical membrane. When the pitch of the helical membrane was decreased from 30mm to 10mm removal fraction of SO2 will be increased 3%~13%, while decreasing the inner diameter of helical membrane from 5mm to 3mm the removal fraction of SO2 also could be increased about 3%. Membrane moulds can be operated repeatedly, this reveals that membrane based FGD technology has the foundation of industrial application.