トレファクションによる木質バイオマスの石炭混焼プロセスの LCCO₂

抄録

After the accident of Tokyo Electric Power Daiichi Fukushima nuclear power plant in 2011, dependence on the coal-fired power plant has been rising in Japan. On the other hand, the fuel unit price for coal has been low due to the high amount of CO₂ emission. Because of this, co-firing of woody biomass to coal firepower has been considered as the counter-measure. This paper focused on the biomass fuel torrefaction manufacturing process that can achieve over 30% of co-firing fraction in a coal firing power plant. Also, the paper discussed the LCCO₂ of a system where the heat waste of pyrolysis process was utilized. The CO₂ emission of the entire system including raw material production, transportation, and co-firing was calculated and compared with chip and pellet. As a result, CO₂ reduction was achieved and the in the case where 30% of torrefied material was used in coal co-firing power plant, 95,000 t of-CO₂/Y could be avoided for 50MW power generation compared to using 100% coal.