高圧縮固体バイオマス燃料の燃焼利用

抄録

Utilization of biomass fuel is attracting more attention due to its advantage to the global warming problem. Biocoke (BIC), highly densified biomass briquette, has unique features such as economical advantages for its versatility of biomass resources, high volumetric calorific value because of its high density and high mechanical strength. The BIC made of Reynoutria japonica (Japanese knotweed), cylindrical blocks with 48 mm in diameter and 85 mm in length, are selected in the study. To investigate the fundamental thermal and combustion properties of the BIC, ignition and combustion behaviors are observed in the hot air flow. The results show that the ignition mode and the mass loss rate during the flaming combustion are influenced by the supplied air temperature with an interesting manner. This may be ascribed to the thickness of the heated layer inside the BIC depending on the preheating condition. This is because the heated thickness strongly controls the evolution characteristics of pyrolysis gas and the temperature distribution inside the BIC depends on the distinctive property of the BIC, high density. Finally, a new concept of BIC combustion method is proposed considering the BIC unique physical features as well as its fundamental combustion characteristics.