Life cycle analysis of a 'super incineration power plant'

摘要

In Japan, the first gas turbine repowered incineration power plant was introduced in Takahama city at Gunma prefecture in November, 1996. Here, the term of a gas turbine repowered incineration power plant means the steam produced by the incineration plant is superheated by the exhaust gas of a gas turbine introduced additionally within the plant, resulting in the increase of the efficiency of the bottoming steam turbine cycle. This new plant is named the "Super Incineration Power Plant" in short. This study aims to evaluate the energy analysis ratio and the CO{sub}2 emission per kWh of the super incineration power plant, a conventional garbage incineration plant, and a small sized gas turbine-steam turbine combined cycle plant with a bottom-up approach for life cycle analysis. The results are summarized as follows (1) The energy analysis ratio of the super incineration power plant is higher than that of the conventional garbage incineration plant, but is lower than that of the small sized combined cycle plant. (2) The CO{sub}2 emission per kWh of the super incineration power plant is larger than that of the small-sized combined cycle plant. But if the direct CO{sub}2 emission from the combustion of garbage is excluded from the life cycle CO{sub}2 emission in the calculation, the CO{sub}2 emission per kWh of the super incineration power plant becomes lower than that of the small-sized combined cycle plant. (3)The super incineration power plant could improve the energy analysis ratio and the CO{sub}2 emission per kWh in comparison with the average values calculated from the conventional garbage incineration plant and the small-sized combined cycle plant.