Gas absorption and particle removal performance of wet parallel-membrane array system

Abstract

In this study, gas absorption and particle removal performance of wet parallel-membrane array systems were studied. SO2 and oil mist were used as target gas and particle, respectively. To evaluate the gas absorption performance of the wet membrane, we compared it with a packed scrubber of the same flow rate. Unlike a typical packed bed scrubber, the membrane scrubber had high absorption rate and easily spread water, so that liquid flows dynamically in all areas. As a result, the membrane showed higher mass transfer rate than the packed bed. In addition, the pressure drop was extremely low because it did not block the flow. We evaluated the particle removal performance of a wet two stage electrostatic precipitator (ESP) with a wet parallel- membrane array collection stage. It was possible to achieve PM2.5 removal efficiencies more than 90% at a flow velocity of 1 m/s. In addition, the wet membrane-based two stage ESP was easy to design in accordance with the existing ESP design theory, Cochet's charging theory and Deutsch equation. Therefore, the membrane is a promising material for an air pollution control device such as a scrubber and an ESP.