廃棄物エネルギを用いた循環型社会に向けたLCA解析モデルの構築

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Waste biomass has a feature of carbon-neutral and contributes to reduction of CO2 emissions greatly. Therefore, a sustainable energy system can be realized by utilizing the waste biomass such as wood, kitchen waste, sewage, and so on effectively. However, it is difficult to handle the waste biomass as fuel because of a difference in their form. For this reason, it is necessary to carry out energy transduction of the biomass to a suitable form for power generation. In this study, the energy conversion system was built up by pyrolysis gasification through superheated steam gesification system. However, biomass has a low energy density, due to low volume spread over wide areas, with large energy consumption by the transport of waste to the gasification process. Hence, using the technique of Life Cycle Assessment, evaluation should be conducted prior to implementation of this system. This study proposes modeling analysis for Life Cycle Assessment of the waste energy through superheated steam gasification system. Life cycle analysis is used to assess the energy balance and CO2 emissions on material's transportation, chipping, drying, gasification and generation process totally. In this paper, the impact of differences in the amount and type of resources in urban and rural area were considered to evaluate to energy balance and CO2 emissions for each process. It was obtained that energy independence ratio is over 10% in rural area with this methodology and both the energy profit ratio and the rate of CO2 reduction are improving with the increase in processing speed.
2013-07-00

廃棄物エネルギを用いた循環型社会に向けたLCA解析モデルの構築

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