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Effects of oxygen concentration on the torrefaction of woody biomass at temperatures below 300oc |
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| รหัสดีโอไอ | |
| Title | Effects of oxygen concentration on the torrefaction of woody biomass at temperatures below 300oc |
| Creator | 1. Arthit Phopiyanukror 2. Nakorn Worasuwannarak |
| Publisher | Joint Graduate School of Energy and Environment |
| Publication Year | 2557 |
| Keyword | Biomass, Pyrolysis, Gasification, Torrefaction, Oxygen concentration |
| Abstract | Biomass is a renewable energy resource which is considered as an environmental friendly fuel by producing less CO2 emission when compared to that of fossil fuel. However, raw biomass has many drawbacks when compare with fossil fuel such as petroleum oil or coal. Firstly, biomass has low energy density. Secondly, fibrous nature of biomass causes the difficulty in size reduction. So, many techniques have been proposed to reduce those drawbacks and to improve the properties of biomass such as briquetting, biochar, bioslurry and torrefaction. Among these proposed technologies, torrefaction is considered to be very attractive due to its advantage in improve fuel volumetric energy density as well as increase grindability. Torrefaction is a pre-treatment technique, usually preformed in inert atmosphere at temperature below 300?C.It was found that the energy density as well as the higher heating value (HHV) was increased progressively at higher torrefaction temperature and at longer holding time. However, few studies have been conducted to examine the effect of oxygen concentrations at temperature below 300?C. In this study, woody biomass (Leucaena Leucocephala) was torrefied at 220, 240, and 260?C under the oxygen concentration of 2, 5, 10, and 22%. The gas formation rate during the torrefaction under the different oxygen concentrations was also examined in detail. It was found that the different oxygen concentrations affected significantly the reactivity of biomass during the torrefaction especially at 260?C. At 260?C, the high oxygen concentration affected significantly the chemical properties of the torrefied biomass. |
| ISBN | 978-616-92228-1-1 |
