P-22　グリーン水素を導入する木質バイオマス水蒸気ガス化を経由したBTLプロセスの環境性・経済性評価

抄録

In this study, the environmental impact analysis and economic performance of BTL (Biomass to Liquids) process via green hydrogen-enhanced steam gasification of woody biomass followed by methanol and methanol-to-gasoline (MTG) fuel synthesis were studied. A concept of addition of hydrogen (H₂) during biomass gasification to suppress the production of carbon dioxide (CO₂), as well as to retain high quality of carbon in the biochar, was developed and simulated in a commercial software. As a result, the green-hydrogen enhanced BTL (GH-BTL) showed a higher yield of fuel (0.36 kg-fuel/kg-biomass) than the conventional-BTL (C-BTL). The CO₂ emissions were reduced roughly 17% with an input of steam-to-biomass and hydrogen-to-biomass of 0.712 and 0.00395 kg/kg-biomass, respectively. From the economical point of view, the total product cost (TPC) computed for GH-BTL was 365.6 ¥/kg-fuel. However, the earning before taxes (EBT) were unfavorable in GH-BTL except the green hydrogen cost less than 250 ¥/kg-hydrogen.