エネルギーキャリアLCAへの期待：CO₂フリー水素、アンモニア導入を例に

抄録

Objective. The author tried to explain the energy and environmental issue with a way which amateur could understand. While explaining the energy flow in Japan, the author tried to give a model how CO₂ emission could be reduced in the future. Importance of CO₂ free hydrogen and the evaluation with LCA method is to be discussed.

Results and Discussion. The Japanese population and energy demand are subjected to decrease 1% annually up to 2050. In order to access to the government road map of CO₂ reduction 3 kinds of fossil fuels（oil, LNG and coal）must be reduced annually 2%, 1%, and 1% respectively. At the same time CO₂ free energy source（renewable, atomic, and CO₂ free hydrogen energy）must be increased to keep the total energy demand at an appropriate level. Importance of CO₂ free hydrogen energy is pointed out. The new technologies which are now under development are shown, especially for the case of utilizing ammonia as a fuel. Finally, two examples to introduce CO₂ free ammonia from abroad are shown. Tentative LCA are also discussed there.

Conclusions. Tentative values of carbon foot print of ammonia fuels are shown, which are about 1/4 and 1/10 of the value of gasoline for natural gas based ammonia with EOR operation and renewable electricity based ammonia, respectively. Further work is expected to examine these values in the future.