Product Characteristics from the Torrefaction of Bamboo Pellets in Oxidative Atmosphere

Abstract

Bamboo is a potential energy crop for the future and an attractive option to replace wood due to its fast growth, high productivity, and essential fuel characteristics such as low ash content, alkali index, and high heating value. This study aimed to evaluate the effects of torrefaction on the physical properties of andong (Gigantochloa pseudoarundinacea) and betung (Dendrocalamus asper) bamboo pellets. Torrefaction of bamboo pellets was conducted in an oxidative atmosphere using an electric furnace at 280°C with a residence time of 40 min. The results showed that oxidative torrefaction caused a decrease in the equilibrium moisture content of bamboo pellets. Water resistance and water adsorption test showed that the torrefied pellets are more resistant to water and relative humidity than the non-torrefied pellet, which is beneficial when the pellet is stored for a long time and in humid conditions. The results also showed that the density of bamboo pellets decreased after torrefaction.