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    Effect of the presence of HCl on simultaneous CO2 capture and contaminants removal from simulated biomass gasification producer gas by CaO-Fe2O3 sorbent in calcium looping cycles
    (2021-12-01)
    Dashtestani, Forogh
    ;
    Nusheh, Mohammad
    ;
    Siriwongrungson, Vilailuck
    ;
    Hongrapipat, Janjira
    ;
    Materic, Vlatko
    This study investigated the effect of HCl in biomass gasification producer gas on the CO<inf>2</inf> capture efficiency and contaminants removal efficiency by CaO-Fe<inf>2</inf>O<inf>3</inf> based sorbent material in the calcium looping process. Experiments were conducted in a fixed bed reactor to capture CO<inf>2</inf> from the producer gas with the combined contaminants of HCl at 200 ppmv, H<inf>2</inf>S at 230 ppmv, and NH<inf>3</inf> at 2300 ppmv. The results show that with presence of HCl in the feeding gas, sorbent reactivity for CO<inf>2</inf> capture and contaminants removal was enhanced. The maximum CO<inf>2</inf> capture was achieved at carbonation temperatures of 680<sup>◦</sup>C, with efficiencies of 93%, 92%, and 87%, respectively, for three carbonation-calcination cycles. At this carbonation temperature, the average contaminant removal efficiencies were 92.7% for HCl, 99% for NH<inf>3</inf>, and 94.7% for H<inf>2</inf>S. The outlet contaminant concentrations during the calcination process were also examined which is useful for CO<inf>2</inf> reuse. The pore structure change of the used sorbent material suggests that the HCl in the feeding gas contributes to high CO<inf>2</inf> capture efficiency and contaminants removal simultaneously.