ผลของวัสดุเบดต่อสมบัติของเชื้อเพลิงแข็งจากทอร์ริแฟกชันของชีวมวล / สุดาวัลย์ ดำหนก = Effect of bed materials on properties of solid fuel from biomass torrefaction / Sudawan Damnok
Torrefaction is a process for improveming the properties of biomass as solid fuel. The process was operated under mild conditions 200-300oC, inert gas and atmospheric pressure. Experiments were carried out in a shaking reactor of approximately 2 liter. Sawdust and giant leucaena were employed as biomass samples. This work focused on investigating effects of various bed materials, including sand, zeolite 3A and zeolite 5A, on the torrefaction process with ratio of biomass to bed material of 1:1 by weight. It was found that biomass torrefaction with bed material produced solid product with higher energy density and heating value while lower moisture content, volatile content and oxygen content, in comparison with the absence of bed material. Moreover, it revealed that torrefied biomass exhibited solid-fuel properties were closed to that of bituminous coal. In addition, an increase in temperature led to a decrease of solid yield, especially in case of giant leucaena. The optimal operating conditions for this work were sawdust torrefaction with zeolite 5A at temperature of 300 oC. The solid fuel had the heating value of 30 MJ/Kg, higher mass yield, lower volatile matter and oxygen content than the raw biomass.
