Abstract
The Rankine bottoming plant is a cost-effective means of energy saving on motor ships. However, drastic improvement in specific fuel consumption of main diesel engines caused a large reduction in its exhaust gas energy, hence made difficult to apply conventional bottoming plant. The author carried out research & development towards advanced heat recovery systems by introducing new ideas and made success in realizing dual steam pressure system in 1978, mixed pressure turbo-generator system in 1982, hot water heat recovery & flash steam turbine system in 1984 and finally combined steam & gas turbine generator system in 1986. The overall thermal efficiency of a diesel propulsion plant was improved from 40 % to 54 % in terms of propulsive power generation and from 51 % to 62 % in terms of cogeneration. The vessels equipped with advanced heat recovery systems amount to 136 vessels at the end of September 1988.
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