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Biomass Gasification Using Carbon Dioxide: Effect of Temperature, CO2/C Ratio, and the Study of Reactions Influencing the Process

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journal contribution
posted on 26.02.2016, 00:00 by Narendra Sadhwani, Sushil Adhikari, Mario R. Eden
Gasification of southern pine using carbon dioxide as an oxidizing medium was carried out in a bench-scale atmospheric bubbling fluidized bed gasifier, and the results were compared with an oxygen gasification study from literature. Evolution of gases (CO, CO2, H2, and CH4) was quantified as a function of temperature in the range 700 °C to 935 °C and CO2/C ratios in the range of 0.5–1.5 (wt/wt). The main aim of this study was to determine the effect of temperature and CO2/C ratios on the output syngas and to understand which reactions were influential within the operational limits of the experimental parameters. Additionally, results from CO2 gasification and oxygen gasification were thoroughly compared. Statistical analyses were performed to determine the significance of changes in operating parameters on the process. Variation in temperature seemed to have a significant effect on the output, whereas the effects of CO2/C ratios were not that profound. The analyses of the gas evolution trends suggested that the Boudouard reaction, char reforming reaction, and free radical combination reactions dominated the chemistry of the process.