Control Strategy for Mercury Emissions from Coal-Fired Flue Gas in China

• • Synergistic mercury removal in existing air pollution control devices (APCDs) after ultra-low emission retrofitting can achieve >90% removal efficiency, but optimization of operational parameters (e.g., flue gas temperature, sorbent injection rate) is critical to reach near-zero emissions. • • CuCl2-modified magnetospheres from fly ash demonstrate high elemental mercury (Hg0) removal performance: at a 50 MWth pilot plant, injection achieved >90% removal; at a 1000 MWth commercial demonstration, removal efficiency remained >85%, indicating scalability. • • Swirl diffusion strategy for magnetosphere injection boosts mercury removal effectiveness, as reported in Chemical Engineering Journal (2024), with improved sorbent dispersion and contact time, enhancing removal by up to 15% compared to conventional injection. • • Vacuum thermal desorption and microwave heating are effective for mercury recovery from spent catalysts and wastes, achieving >99% recovery efficiency, enabling resource recycling and reducing secondary pollution.