バイオマス燃焼で生成される灰の性状

抄録

In this study, bamboo powder combustion experiment was conducted while changing the temperature using a flat flame in order to clarify the mass transfer mechanism of ash. Deposits and residues after combustion were predicted by EDX analysis and thermodynamic equilibrium calculation by FactSage. From the visualization results, only a small amount of deposit was observed at a maximum combustion temperature T_max = 1200 K, but a strong and large amount of deposit was confirmed at T_max = 1300 K. EDX analysis focused on K₂O, SiO₂, and Fe₂O₃, which are the main components of ash, and found that in the residue, the higher the combustion temperature made the more the ratio of SiO₂ and Fe₂O₃. From the EDX analysis results of the deposits, K₂O accounted for about 80 % at T_max = 1200 K, but the ratio of SiO₂ and Fe₂O₃ increased significantly at T_max = 1300 K. In the thermodynamic equilibrium calculation by FactSage, it was found that the higher the equilibrium temperature got the more the eutectic in the solid state of Fe₂O₃ and K-Si system.