As deviations in H2 production
capacity by countries
become a considerable barrier to the realization of the global H2 economy, international trade between countries with abundant
resources and those with limited resources is required. In line with
this trend, numerous supply chains between several countries have
been planned, and associated studies have been conducted. However,
the study which treats international overseas H2 trade
chains considering numerous major importing and exporting countries
has rarely been conducted before. In this study, a comprehensive optimization
for the overseas H2 supply chain considering the three
major importing countries including Korea, Japan, and Germany was
conducted with mixed-integer linear programming considering both economic
and environmental aspects simultaneously. Through the optimization
study, the most feasible H2 supply chains for each importing
country could be verified according to years and case scenarios. Blue
H2 from Qatar turns out to be the most feasible supply
chain for Japan in 2030, while green H2 from South Africa
is the most feasible one for other importing countries. In 2040, green
H2 from South Africa and Australia becomes the best one
for Asian importers, and Australia finally dominates all the supplies
after 2050. In the case of Germany, green H2 from Spain
is considered the best after 2040. Depending on the scenario, the
difference in the selected countries and supply amounts is not significant,
though the costs are varied. Ammonia turns out to be the most feasible
carrier for H2, and the total cost including the carbon
tax ranges from 2.15 to 3.43 $ kgH2
–1, which is a range from the current green H2 to the blue
H2 price.