Methanol solution promoting cotton fiber chemical looping gasification for high H2/CO ratio syngas

Abstract

Chemical looping gasification (CLG) is expected to act as an efficient novel technique realizing energy conversion, but solid fuel CLG suffers from inadequate fixed carbon conversion. Sufficient oxidant would be the grand cure for the torment that ever besets solid fuel CLG. We here reported a strategy to promote cotton fiber CLG to produce syngas with high H2/CO ratio by introducing methanol solution for supplying adequate H2O and CO. Experiments were performed under various oxygen excess number (Ω) at 850 °C. Ω around 0.3 favors the generation of syngas with high H2/CO ratio and high carbon conversion (η). Comparatively experiments concerning effect of methanol solution on cotton fiber CLG verified its significant promotion on syngas generation. Methanol solution can even play a more significant role than water to increase the H2/CO ratio and η from 5.64 to 71% to 6.82 and 87%, respectively, while H2/CO ratio and η for the direct cotton fiber CLG without water and methanol solution is only 1.28 and 29%. Stoichiometry and thermodynamics analysis further verified the possibility of cotton fiber CLG using methanol solution, which shows a double advantage of waste solution treatment and energy conversion.