Abstract. As abundant resources, ulin wood residues could be converted into bioenergy through pyrolysis process. To detail analysis, the pyrolyzer reactor was connected to micro GC for online gas analysis. By comparing to other biomass e.g. pinewood and low-grade coal, the ulin wood residues exhibited similar result when the pyrolysis process started around 400 o C. The char product decreased as elevated temperature due to gasification process. Based on the gas analysis, this pyrolysis produced a gas product which predominant composed of CO. The SEM analysis also showed that the pyrolysis treatment resulted in fine char with nanopores particles. Hence, the reactivity of the solid product would be increased significantly. Therefore, the ulin wood residues could be other alternatives as a renewable energy source through pyrolysis process.
Biomass as a renewable and sustainable energy source is expected to solve the energy crisis problem. Ulin wood residues as a biomass source could be converted into bioenergy utilizing the pyrolysis process since its primary component is a hydrocarbon. Pyrolysis process has received many interests for bioenergy production from biomass, elevating the importance of the kinetic study of pyrolysis. The kinetic study of pyrolysis is related to the beginning stage behavior of gasification and combustion process. The kinetic mechanism of pyrolysis is analyzed using Thermogravimetry Analysis (TGA), by estimating the mass decomposition at solid-state that shows TG and DTG curve. The TG and DTG curves were analyzed to see the effect of heating rate on decomposition temperature. This experiment was performed by heating 10 mg of Ulin wood sawdust from ambient temperature to 1473 K utilizing 100 mL/min of nitrogen (N 2) gas as carrier gas at various heating rate: 5, 10, 20, and 50 K/min. The kinetic parameters were determined by applying the iso-conversional methods, the Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods, and then compared the results with the non iso-conversional method, using Kissinger method. The average value of activation energy calculated using the KAS and FWO methods are 253.5514 and 245.2512 kJ/mol, with the average value of constant coefficient square (R 2) of 0.9848 and 0.9859, respectively, whereas the calculated activation energy and R 2 using the Kissinger method are 237.4478 kJ/mol and 0.8520, respectively.
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