바이오매스 부산물의 저속 열분해 특성에 대한 실험적 연구

Abstract

Pyrolysis of biomass is the thermal decomposition of its carbohydrate structures into numerious hydrocarbon compounds, light gases and carbon-rich solid residue. Understanding the pyrolysis characteristics is essential as fundamental data for various thermo-chemical conversion of biomass. This study investigated slow pyrolysis of four Indonesian biomass (sugarcane bagasse, cocopeat, palm kernel shell (PKS), umbrella tree) for a temperature range of 300 ~ 600oC. With increase in temperature, all samples showed a decrease in the biochar yield as more compounds were released as vapors increasing the bio-oil and gas yields. The biochar became more carbon-rich with a carbon content of 85 % or higher at 500oC. However, the product yields and properties showed large variations between the samples. Cocopeat had the highest biochar yield, while wood and baggasse had the highest bio-oil yield. Despite the low mass yields, the biochar of wood and bagasse had the best quality in terms of macro-pore and micro-pore development, which is a key property for its applications as adsorbent, soil ameliorator, as well as fuel. The bio-oil did not have a sufficiently high HHV for use as main fuel, but could be utilized through co-firing or slurry production with biochar. In the light gases, CO and CO2 were dominant, but could be burned on-site to supply the heat required for pyrolysis.