Sub- and supercritical water gasification of rice husk: parametric optimization using the I-optimality criterion
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Date
2021
Journal Title
Journal ISSN
Volume Title
Publisher
American Chemical Society
Abstract
In this study, rice husk biomass was gasified under sub- and supercritical water conditions in an autoclave reactor. The effect of temperature (350–500 °C), residence time (30–120 min), and feed concentration (3–10 wt %) was experimentally studied using the response surface methodology in relation to the yield of gasification products. The quadratic models have been suggested for both responses. Based on the models, the quantitative relationship between various operational conditions and the responses will reliably forecast the experimental outcomes. The findings revealed that higher temperatures, longer residence times, and lower feed concentrations favored high gas yields. The lowest tar yield obtained was 2.98 wt %, while the highest gasification efficiency and gas volume attained were 64.27% and 423 mL/g, respectively. The ANOVA test showed that the order of the effects of the factors on all responses except gravimetric tar yield follows temperature > feed concentration > residence time. The gravimetric tar yield followed a different trend: temperature > residence time > feed concentration. The results revealed that SCW gasification could provide an effective mechanism for transforming the energy content of RH into a substantial fuel product.
Description
Full text article. Also available at https://doi.org/10.1021/acsomega.0c06318
Keywords
Rice, Rice husk, rice husk biomass, Sub- and supercritical water conditions, Autoclave reactor, Temperature, Biomass, Water gasification, Rice husk, Supercritical water
Citation
Bakari, R., Kivevele, T., Huang, X., & Jande, Y. A. (2021). Sub- and supercritical water gasification of rice husk: parametric optimization using the I-optimality criterion. ACS Omega, 2021(6), 12480−12499.