Abstract: For terminal control of PCDD/Fs generated during municipal solid waste (MSW) incineration, the predominant technology employs adsorption by activated carbon powder, combined with filtration and collection via fabric bag filters. This process concentrates PCDD/Fs into fly ash, although the total quantity remains unchanged. In this research, a dry process with deacidification+catalytic ceramic fiber tube integrated system+heat exchange+activated carbon fixed-bed adsorber was utilized. We deployed a pilot-scale system in a waste-to-energy plant, conducting sample collection at multiple locations and analyzing dioxin emission levels, and the mechanisms of dioxin formation and control were investigated. The results showed that the initial dioxin concentration (measured in TEQ) in the flue gas from the circulating fluidized bed (CFB) economizer section was 29.840 ng/m3, with the solid phase accounting for 80.46%. Using a hybrid system of catalytic ceramic fiber tubes coupled with an activated carbon fixed-bed adsorber, PCDD/Fs removal rate of 99.93% was achieved, resulting in a final emission concentration (measured in TEQ) of 0.022 ng/m3. The catalytic ceramic fiber tubes can physically intercept and filter solid-phase PCDD/Fs, and chemically decompose gaseous-phase PCDD/Fs, leading to an overall reduction in total dioxin levels. This study provides theoretical reference for dioxin control in MSW incineration flue gas.

Key words: waste incineration, flue gas purification；PCDD/Fs, catalytic ceramic fiber tube, activated carbon adsorption, regeneration mechanism