抄録
From an energy saving viewpoint, an effective method to generate electricity for diesel ships is to recover the energy available from the exhaust gas of the main diesel engine.
So for turbo-generating plants driven by steam (7-8 kg/cm2g) which have been converted with an exhaust gas economizer have been used for this purpose.
However, when the rated-output of the main engine is less than 20, 000 BHP, this conventional system is not practical, i.e. the electric power obtainable cannot sufficiently meet the demands of the ship's plants due to the relatively small amount of exhaust gas energy available.
While, the need for saving energy has become more important following the energy crisis of 1973. In response to such social needs, Hitachi Zosen has developed a new turbo-generating plant which makes it possible to obtain the electric power needed on board even when only a relatively small amount of exhaust gas energy is available from the main diesel engine.
The main features of the new plant include a reduction in steam pressure, the addition of new heat recovery techniques and the application of newly developed compact steam turbine. Namely in each, the reduction in steam pressure allows increased heat recovery in the exhaust gas economizer by decreasing the saturated steam temperature and the heat recovery techniques aid in providing better steam evaporation and the compact steam turbine efficiently convert steam energy to electric power.
This new plant can be practically adopted for ships which have a main engine with roughly over 10, 000 BHP.
