A life cycle assessment of biomass energy system

摘要

In recent years, biomass resources have been expected to produce energy including electricity with reducing CO{sub}2 emissions. We can evaluate that the net amount of CO{sub}2 emissions is equivalent to zero, if we could realize a sustainable plantation of the biomass resources in long term. In this paper, we investigate the bioenergy power plant in the developing country utilizing Life Cycle Assessment (LCA). Namely, we compare the following three systems; the system including an integrated gasification combined cycle (IGCC), the system including an internally circulating fluidized-bed boiler plant (ICFB) and the system including the coal power plant. Whole processes like establishment, fertilization, scattering pesticides, harvesting and transportation are usually taken into account in the biomass LCA. Further, in this paper, soil erosion and the change of biomass production by the rainfall are included. As results, in the case of ICCC system, the CO{sub}2 intensities (=the net amount of CO{sub}2 emissions [kg-CO{sub}2/electricity [kJ/h] are 38.3 [kg-CO{sub}2/GJ] in the highest and 15.3 [kg-CO{sub}2 /GJ] in the lowest case. In the case of ICFB system, they are 39.8 [kg-CO{sub}2/GJ] in the highest case and 37.0 [kg-CO{sub}2/GJ] in the lowest case. Their systems are superior to the coal system concerning the CO{sub}2 intensity.