O-12 籾殻燃焼による熱利用と燻炭利用の経済性評価

抄録

This study aimed to propose economic evaluation for heat and rice husk charcoal utilization by rice husk combustion. Rice husk charcoal was prepared by electric furnace on the 12 combustion conditions, combination of combustion temperature (400, 500, 600, 700, 800, and 900°C) and combustion time (3 and 60 min). Economic value of heat utilization of rice husk was evaluated by output heating value and the amount of unburned carbon. Economic value of rice husk charcoal utilization was evaluated based on the amount of eluted soluble silica as fertilizer component measured by the molybdenum blue absorptiometry. As a result of 3 min combustion, economics increased with increasing combustion temperature, 0.14 JPY/g-fuel (400°C) to 0.23JPY/g-fuel (900°C). On the other hand, as a result of 60 min combustion, economics decreased with increasing combustion temperature, 0.26 JPY/g-fuel (400°C) to 0.09JPY/g-fuel (900°C). These results show the possibility of short-term and high-temperature combustion for developing rice husk burner as biomass utilization.