海外で大規模太陽光発電して水電解水素変換後日本に輸送するシステムのエネルギー評価

抄録

This study proposes four possible energy supply chains from the megawatt class of photovoltaics (PV) installation in Kuala Lumpur, Kolkata, Beijing or Ulan Bator to end users in Tokyo Japan. In the proposed chains, the electricity generated from solar PV panels would be used to generate H₂ through water electrolyzer. The H₂ is then liquefied (or converted into organic hydride) and transported by tank truck for land as well as tanker for marine to Japan and finally supplied to fuel cells (FC) for power generation purpose. This study investigates the energy efficiencies of the proposed energy supply chain and the amount of CO₂ emission in the transportation process from the four locations. As a result, it is found that the largest amount of power could be generated in Ulan Bator than in other cities with the same size of solar panel array, while it also emitted the largest amount of CO₂ in the transportation process. The best energy efficiency is obtained in the case of Beijing. This study also revealed that the ratio of total energy consumption to caloric value of H₂ after transportation in the case of H₂ liquefaction is smaller than that in the case of organic hydride.