Hydrogen-Rich Gas Production by Cogasification of Coal and Biomass in an Intermittent Fluidized Bed

This paper presents the experimental results of cogasification of coal and biomass in an intermittent fluidized bed reactor, aiming to investigate the influences of operation parameters such as gasification temperature (T), steam to biomass mass ratio (SBMR), and biomass to coal mass ratio (BCMR) on hydrogen-rich (H(2)-rich) gas production. The results show that H(2)-rich gas free of N(2) dilution is produced and the H(2) yield is in the range of 18.25~68.13 g/kg. The increases of T, SBMR, and BCMR are all favorable for promoting the H(2) production. Higher temperature contributes to higher CO and H(2) contents, as well as H(2) yield. The BCMR has a weak influence on gas composition, but the yield and content of H(2) increase with BCMR, reaching a peak at the BCMR of 4. The H(2) content and yield in the product gas increase with SBMR, whilst the content of CO increases first and then decreases correspondingly. At a typical case, the relative linear sensitivity coefficients of H(2) production efficiency to T, SBMR, and BCMR were calculated. The results reveal that the order of the influence of the operation parameters on H(2) production efficiency is T > SBMR > BCMR.