Gas Absorption and Particle Removal Performance of Wet Parallel-Membrane Array System

In this study, the gas absorption and particle removal performance of wet parallel-membrane array systems were investigated. SO ₂ and oil mist were used as the target gas and particles, respectively. To evaluate the gas absorption performance of the wet membrane, we compared it with a packed-bed scrubber at the same flow rate. Unlike a typical packed-bed scrubber, the membrane scrubber has a high absorption rate and easily absorbs water so that the liquid flows dynamically across the entire membrane. Therefore, the membrane exhibited a higher mass transfer rate than the packed bed. In addition, the pressure drop was extremely low because the flow was not blocked. We evaluated the particle removal performance of a wet two-stage electrostatic precipitator (ESP) with a wet parallel-membrane array collection stage. A PM _2.5 removal efficiency higher than 90% at a flow velocity of 1 m/s was achieved using the proposed system. In addition, the wet-membrane-based two-stage ESP was easy to design according to the existing ESP design theory, Cochet's charging theory, and Deutsch equation. Also, our new wet-membrane-based two-stage ESP can remove acid gas and particles simultaneously. Therefore, this membrane can be a promising material for air pollution control devices, such as scrubbers and ESPs.