2015 年 94 巻 1 号 p. 137-142
This study proposed a comprehensive evaluation method for rice husk combustion in rural areas. The evaluation was considered with the aspects of economic value of energy as conventional evaluation criterion, environmental impact, and economic value of rice husk charcoal in the recycling system. Inventory analysis was conducted to estimate material and energy flow for inputs and outputs of a rice husk burner (Kaneko Agricultural Machinery Co. Ltd. Saitama, Japan). Inventory data was collected for the combustion experiment using the rice husk burner. Results revealed that 14.4 kg-fuel/h of rice husk supply was the highest value of overall evaluation, because of producing valuable rice husk charcoal as by-product and small quantity of harmful substances in rice husk combustion. Trade-off relationship between economic value of energy, environmental impact, and the economic value of rice husk charcoal was observed in variations of the integrated result. It was clarified that the comprehensive evaluation method contributed to achieve high economic value of energy, low environmental impact, and high economic value of RHC simultaneously.
