Abstract
Recently, agricultural wastes such as sawdust, nutshell and woodchips have been considered as valuable resources which makes it possible to produce alternative fuels or valuable chemicals. The pyrolysis process is considered as the most promising and economical process for the conversion of agricultural wastes. In this study, the pyrolysis characteriscits of agricultural wastes have been determined in a TGA and a bubbling fluidized bed. The agricultural wastes are composed of biopolymers which consist of celluse, hemicelluloses and lignins, which were analyzed by elemental analyser. In TGA(TG-2171, Thermo Chan Co.), the effects of rising temperature rate on maximum pyrolysis temperature, pyrolysis status and so on have been determined. The effects of bed temperature, gas velocity, L/D ratio and bed particle diameter on conversion have been determined in a bubbling fluidized bed (I.D. 7.6cm and 80cm high). For the capturing the bio-oil mist, eletrostatic precipitator was equipped at the exit of cyclone. The amount of bio-oil and char decreases with the increase of reaction temperature because an increase of reaction temperature enhances the reaction between oxygen and organic compounds. Increase of L/D ratio slightly incerase the formation of gas product due to an increase of gas residence time in bed materials. Addition of small amount of oxygen changes the composition of pyroligneous acid.
