エネルギー有効利用からみた石炭変換プロセスの評価(I)

抄録

In this series, we attempt to evaluate various coal conversion processes from an energy efficient use viewpoint, and also clarify how and where each conversion process has to be utilized in the total energy network of Japan.
In this paper, various energy chains, which produce h eat and mechanical work from different primary energies, are compared by two efficiencies of an energy-conversion process, i. e., thermal and exergy efficiencies.
To see how primary energies were consumed in the overall energy flow in Japan, an exergy flow diagram for Japan in 1975 was presented and compared with its for the U. S. by Reistad. A typical difference in the wasting of exergy between Japan and the U.S. was that the largest contributor to the wasting of exergy in Japan was industrial sector, while in the U. S. the industrial sector was the lowest. Finally, a coal energy chain is illustrated, in which coal is converted into different secondary energies through various coal conversion processes and they are consumed in the end-uses. The future coal energy chain in Japan was briefly discussed.