道南洋上風力発電を用いた函館市水素サプライチェーンの計画

抄録

In order to achieve carbon neutrality by 2050, the introduction of renewable energy sources for the supply of electricity and heat will be necessary. Therefore, this study examines the supply of energy to Hakodate City from a 722 MW rated offshore wind turbine planned off the coast of Hiyama in southern Hokkaido. In the proposed system, the output power is transmitted to Hakodate City via a transmission line. The transmitted power is divided at a substation in the city into (i) power to be supplied to the demand side using transmission lines and (ii) power to produce water electrolysis hydrogen and convert it into MCH. The MCH produced is supplied to fuel cells installed in the city by pipeline via dehydrogenation equipment to supply hydrogen gas to the fuel cells to generate electricity. The heat generated during power generation is stored, and the heat is sent to nearby dwellings and facilities, where it is converted into heating and hot water for use. Considering the efficiency of each device, all output was converted to MCH and supplied, resulting in 18.3% of the annual electricity demand and 9.66% of the annual heat demand. However, when comparing the annual output of wind turbines with the annual energy demand, the output is more. Currently, the optimal values for separating power for water electrolysis and power for transmission are being studied and a more advanced analysis flow is being prepared, including storage of MCH.