Impeller-driven scrubber system for enhanced nitric oxide capture using Fe(II)EDTA

To make it possible to simultaneously remove water-soluble SOx and insoluble NOx from flue gases, a novel scrubber system utilizing a specially designed impeller was developed. The impeller, which is a radial type, was equipped with mesh sheet for the sake of the generation of micro-sized liquid particles. With the modification, liquid particle decreased from 99 μm to 72 μm, which can accordingly raise the liquid-gas contact efficiency. With it, NO absorption, whose efficiency is known to be negligibly poor with water-based scrubbing, was aided with Fe(II)EDTA. The impeller-equipped, new scrubber showed 91.0 % of NO gas removal efficiency. When it was further amended with an inner impeller, enhancing the spreading and mixing effects, the efficiency rose to 93.6 %. Finally, by increasing retention time via dividing the chamber and using two discrete impellers, 96.6 % of efficiency was obtained. This impeller-based scrubber, while experimentally evaluated for NO control, is expected to offer a scalable and cost-effective water-based platform that can also be adapted for SOx removal in future applications.