Pre-treatment of karanja biomass via torrefaction: Effect on syngas yield and char composition

Dhanavath, K, Satyavathi, B and Parthasarathy, R 2015, 'Pre-treatment of karanja biomass via torrefaction: Effect on syngas yield and char composition', in Asia Pacific Confederation of Chemical Engineering Congress 2015: APCChE 2015, incorporating CHEMECA 2015, Melbourne, Australia, 27 September - 1 October 2015, pp. 1174-1185.


Document type: Conference Paper
Collection: Conference Papers

Title Pre-treatment of karanja biomass via torrefaction: Effect on syngas yield and char composition
Author(s) Dhanavath, K
Satyavathi, B
Parthasarathy, R
Year 2015
Conference name Asia Pacific Confederation of Chemical Engineering Congress 2015: APCChE 2015, incorporating CHEMECA 2015
Conference location Melbourne, Australia
Conference dates 27 September - 1 October 2015
Proceedings title Asia Pacific Confederation of Chemical Engineering Congress 2015: APCChE 2015, incorporating CHEMECA 2015
Publisher Engineers Australia
Place of publication Melbourne, Australia
Start page 1174
End page 1185
Total pages 12
Abstract Torrefaction is a mild pyrolysis process that is carried out at relatively low temperatures. In the present study, torrefaction of karanja de-oiled seed cake was carried out in a bench-scale fixed bed reactor under inert (N2) atmosphere. Effects of different reaction variables like temperature and the residence time on the weight loss and carbon conversion have been studied. Experiments were performed to examine the properties of torrefaction products and cold gas efficiency. The effect of torrefaction was studied by measuring the changes in yield, efficiency, tar and char production during gasification of torrefied biomass. The study confirmed that torrefaction of biomass altered the compositions of syngas produced. Increased torrefaction treatment impacted syngas composition yield by reducing carbon dioxide (around 4 to 10 mol %) and increasing H2 and CH4. Observed cold gas efficiency ranged between 40 and 80%. The syngas produced was rich in H2, CH4, and CO implying that the syngas quality is significantly improved by torrefaction. Also as expected, the moisture content of biomass is reduced by torrefaction. This holds the advantage for storage, transport and subsequent treatments of biomass at large scale. For solid products, it is observed that torrefaction increased the energy density, decreased the oxygen/carbon ratio, resulting in a more complex pore structure. The non-condensable gases accounted for about 50% of the gaseous torrefaction products. Effective use of the torrefaction gases will save energy and improve efficiency. The results of the present study prove that torrefaction of karanja seed cake has good application prospects.
Subjects Chemical Engineering not elsewhere classified
Keyword(s) fixed bed gasifier
karanja biomass
mild pyrolysis
syngas
torrefaction.
ISBN 9781922107473
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