Fuel gas production from co-gasification from black liquor mixed with eucalyptus bark

Abstract

Gasification of black liquor mixed with eucalyptus bark residues is an interesting approach to produce gaseous fuels for energy purpose. The objectives of this work were to suggest appropriate gasification parameters that produce the highest gas yield, carbon and hydrogen conversion to product gases, LHV, cold gas efficiency, syngas production and H2/CO ratio. The operation temperature of 700-900ºC, the ratio of black liquor to eucalyptus bark of 60:40 and 40:60, and equivalence ratio of 0.2-0.6 were applied. Major components in product gases including CO, H2 and CxHy (as CH4). Results from mixed sample gasification using fixed bed reactor indicated that temperature and ER significantly affecting both quantity and quality of produced gas. The increase in temperature and ER lead to greater production of CO, H2 with highest gas yield at 900 °C, while solid and liquid yields decreased. In addition, carbon and hydrogen conversion, gas LHV and cold gas efficiency increase with temperature and ER while H2/CO was lower. The maximum cold gas efficiency and H2/CO of 83.98% and 1.48 were achieved, respectively. The highest syngas production and LHV equals to 32.43 L and 5.66 MJ/m3, respectively, obtained from mixed sample 60:40 that gasified at 900°C and ER of 0.6. Char from gasification contained C, Na and S content. It shown that this char can reuse and suggested for use as a feedstock in gasification process for the further work. Furthermore, Na and S in char can be recovered for using as pulping chemical.