A Basic Study on the Nano CaO-Based CO2 Adsorbents in FFB for CO_2 Capture

摘要

In this paper, we study a nano CaO-based CO_2 adsorbent obtained froma nano CaCO3 precursor by calcination. Nano CaO-based CO_2 adsorbentspossess special features that underline their potential use in circulatingfluidized beds coal gasification. A fixed fluid bed reactor was used to evaluatethe target adsorbent, which was then analyzed using a thermo-gravimetricanalyzer. The following properties were observed from the adsorbentproduced: (1) lower carbonation and regeneration temperatures. This meansenergy savings in the CaCO3 regeneration looping system; (2) faster reactionrate with CO_2. As such, the adsorbent meets the fast reaction needs of CFBsystems; (3) higher sorption capacity of CO_2, especially in fast reaction, andlower decay of sorption capacity; and (4) lower attrition loss during the loopingprocess. Overall, the observed properties demonstrate the applicability of nanoCaO-based CO_2 adsorbents in CFB coal gasification and reactive sorptionenhanced reforming.