Title:
Improving the Efficiency of Hydrothermal Gasification of Carbonaceous Materials
Author(s):
Onwudili, J.A., Williams, P.T.
Document(s):
Paper
Abstract:
Alkaline hydrothermal reactions of different carbonaceous materials have been studied in a batch reactor. Based on experimental evidence, a chemical reaction model was developed for the hydrothermal reaction between alkali and samples for hydrogen gas production. In general, hydrogen gas production increased in the presence of sodium hydroxide for all samples. With each sample, two sets of reactions were carried out involving the effect of water loading of 2 ml and 20 ml. Glycerol and glucose produced the highest hydrogen gas molar yields of 76 % and 74% respectively. No significant differences were observed for the yields of hydrogen gas between the two water loadings. The formation of hydrogen gas and methane could be linked to the role of the stoichiometric reacting water during and after alkali degradation. Hence, once the intermediate compounds were formed, the gas forming reactions were essentially similar for the two water loadings. Indirectly, the results from low water loading show suggest that high concentrations of materials can be gasified in this process. Heatup time (and perhaps energy) savings of up to 46% can be achieved with the aqueous reaction. In addition, high concentration of biomass can also be processed.
Keywords:
gasification, hydrogen, hydrothermal, carbonaceous materials
Topic:
Biomass Conversion Technologies for Heating, Electricity and Chemicals
Subtopic:
Gasification for synthesis gas production
Event:
19th European Biomass Conference and Exhibition
Session:
VP2.4.21
Pages:
1602 - 1604
ISBN-13:
978-88-89407-55-4
ISBN-10:
88-89407-55-7
Paper DOI:
10.5071/19thEUBCE2011-VP2.4.21
Price:
FREE
