Examination of Suitable Torrefaction Conditions for Bio-oils Production from Selected Biomass

Name: Onarin Khumsak

keyword: Torrefaction

Abstract: Biomass is derived from the living mechanism such as the photosynthesis of plant and is an important source of renewable energy which, due to the low content of sulfur and nitrogen in the biomass. Pyrolysis is a technology that can directly produce a liquid fuel from biomass which can be readily stored or transported. However, much research has reported on undesirable properties ofthe bio-oils such as low heating value, low pH value, incompatibility with conventional fuels, high viscosity, and chemical instability. These undesirable properties are mainly brought about by the high oxygen content in the biomass. On the other hand, it is known that the oxygen content in biomass can be reduced by torrefaction at the temperatures below 300 C. In this study biomass was upgraded first by torrefaction at such temperatures. Four types of biomass were used; Leucaena leucocephala, Eucalyptus, cassava rhizome, and rice straw. It was found that the oxygen content in the torrefied biomass decreased whereas yields decreased with the increase in torrefaction temperature for all biomass types. Then, the torrefied biomass was pyrolysed at 550 C to produce bio-oils. The bio-oils were fractionated into light oil and heavy oil fractions which were analyzed by GC-MS to examine the effects of fractionation on the bio-oils properties. Even though the yield of bio-oils decreased after torrefaction, the light oil yields had increased. The bio-oils produced from torrefied biomass have less acidity and water content than that of raw biomass. This may imply that torrefaction can improve bio-oils properties prior to pyrolysis.

King Mongkut's University of Technology Thonburi. KMUTT Library

Address: BANGKOK

Email: info.lib@mail.kmutt.ac.th

Name: Nakorn Worasuwannarak

Role: Advisor

Created: 2010

Modified: 2012-01-07

Issued: 2555-01-03

วิทยานิพนธ์/Thesis

application/pdf

CallNumber: JGSEE256

eng

DegreeName: Master of Science

Level: Master's Degree

Descipline: Energy Technology

Grantor: King Mongkut's University of Technology Thonburi

©copyrights King Mongkut's University of Technology Thonburi

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