Abstract
Energy utilization of rice straw with annual generation of about 9 millon ton has been required. Continuous combustion of rice straw pellets for a long time is difficult in household wood pellet stoves, which has been becoming popular, because the large amount of ash after combustion inhibits the continuous combustion easily. This study attempted to clarify a reason of the combustion inihibition and to investigate a possibility to use wood pellets mixed with rice straw for household wood pellet stoves. As a result, combustion inhibition was caused not by a clinker formation, but by accumulation of large-particle ash with the small bulk density. The volume of accumulated ash in case of wood pellets mixed with rice straw was smaller than that in case of co-combution of wood pellets and rice straw pellets with the same ratio of rice straw to woods. In addition, when the mixiture ratio of rice straw to woods was 10%, the wood pellets mixed with rice straw was burned continuously for a loger time than rice straw pellets, whose compostion was 100% rice straw.
