Abstract
The hot-water flash power generating plant recently developed by Mitsubishi Heavy Industries for diesel ship application far exceeds the conventional economizer-steam power generating plant in terms of waste heat recovery rate, and hence can adequately do its job even with the limited waste heat energy available from the lean exhaust of the increasingly fuel-efficient marine diesel engines which are also smaller for the ship size than hitherto and which are frequently run at part loads for slow steaming. Thus, it is believed that the hot-water flash power generating plant will prove especially worthwhile for ships powered by diesel engines 12, 000 PS and above in output, all these ships now finding it almost practically impossible to employ the conventional economizer-steam power plant.Mitsubishi's hot-water flash power generating plant comes in two types; MARK-N1 and MARK-N2. The former recovers the engine exhaust gas energy all with pressurized water in the exhaust-gas economizer and produces steam by flashing pressurized hot water to drive its generator turbine: The latter, though also equipped with the economizer, recovers high-temperature engine exhaust gas energy as steam and heat of low-temperature exhaust gas and scavenging air with pressurized water to drive the generator turbine with both superheated steam and flash steam.
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