Paper details

Title:

Analysis of Syngas Production via Sorption Enhanced Chemical Looping Biomass Gasification

Author(s):

Wu, K-T., Hsu, W-H., Lin, S-C., Chyou, Y-P., Chen, P-C., Chein, R-Y.

Document(s):

Abstract:

In this study, thermodynamic equilibrium analysis of the sorption-enhanced chemical looping biomass gasification (SE-CL-BG) using Fe2O3 as oxygen carrier, CaO as the CO2 sorbent, and CO2 or H2O as the gasifying agent was conducted. Based on the amount of OC introduced and degree of reaction of carbon and hydrogen contained in biomass with oxygen supplied from oxygen carriers, four stages of biomass gasification can be identified and highly selective syngas can only be resulted when small amount of oxygen carrier was introduced. Due to the oxidations of carbon and hydrogen, the yields of CO and H2, cold gas efficiency, and the second-law efficiency of SE-CL-BG case were found to be lower than the conventional biomass gasification case in which no oxygen carrier and CO2 sorbent were introduced. As compared with conventional biomass gasification, the advantage of SE-CL-BG is that the biomass gasification can be operated at lower temperatures (500~750°C) with higher H2 yield due to enhanced water-gas shift reaction and lower heat duty due to heat release from CO2 absorption reaction. The computed results indicated that CaO loses the ability in absorbing CO2 as temperature higher than 800°C. For fuel reactor operated at 700°C, increase in gasifying agent CO2 or H2O amount resulted in decreases in cold gas efficiency and second-law efficiency for SE-CL-BG case as compared with conventional biomass gasification case. However, heat duty can be reduced in SE-CL-BG case due to exothermic CO2 absorption reaction.

Keywords:

CO₂ sorbent, sorption-enhanced chemical looping biomass gasification (SE-CL-BG), thermodynamic analysis, gasifying agent

Topic:

Biomass Conversion Technologies for Heating, Cooling and Electricity

Subtopic:

Gasification for synthesis gas production

Event:

26th European Biomass Conference and Exhibition

Session:

2BO.14.4

Pages:

536 - 545

ISBN:

978-88-89407-18-9

Paper DOI:

10.5071/26thEUBCE2018-2BO.14.4

Price:

FREE