Waste Heat Recovery (WHR) systems are more and more common on board new commercial ships, and their good efficiency now is to be considered also for retrofitting solutions. The paper describes the performance and cost analysis of a WHR system, based on an auxiliary steam turbine for electric power generation, supplied by the steam plant adopted for the waste heat recovery from the exhaust gas of the main diesel engines. The application concerns a passenger ship, powered by six diesel generators to drive the electric propulsion motors, to feed the several auxiliary systems and to fulfill the whole hotel service demand. The analysis is carried out on the basis of a comparison between new design and retrofitting solutions for the same application, considering that a complete optimization design process is really possible only for an “ex novo” ship project. In fact, the present paper considers the minimum retrofitting intervention (mere addition of turbo-generator and vacuum condenser) where the optimization process can be reasonably restricted to the steam turbine sizing, while for a new ship it can be extended to the selection of the whole machinery. The different results are based on an optimization numerical code, developed by the authors in Matlab software environment, and they are analyzed in terms of performance and cost, in order to provide helpful guidelines to assist ship-owners and shipbuilders in making their decisions.
Waste heat recovery systems from marine diesel engines: comparison between new design and retrofitting solutions
ALTOSOLE, MARCO;LAVIOLA, MICHELE;
2015-01-01
Abstract
Waste Heat Recovery (WHR) systems are more and more common on board new commercial ships, and their good efficiency now is to be considered also for retrofitting solutions. The paper describes the performance and cost analysis of a WHR system, based on an auxiliary steam turbine for electric power generation, supplied by the steam plant adopted for the waste heat recovery from the exhaust gas of the main diesel engines. The application concerns a passenger ship, powered by six diesel generators to drive the electric propulsion motors, to feed the several auxiliary systems and to fulfill the whole hotel service demand. The analysis is carried out on the basis of a comparison between new design and retrofitting solutions for the same application, considering that a complete optimization design process is really possible only for an “ex novo” ship project. In fact, the present paper considers the minimum retrofitting intervention (mere addition of turbo-generator and vacuum condenser) where the optimization process can be reasonably restricted to the steam turbine sizing, while for a new ship it can be extended to the selection of the whole machinery. The different results are based on an optimization numerical code, developed by the authors in Matlab software environment, and they are analyzed in terms of performance and cost, in order to provide helpful guidelines to assist ship-owners and shipbuilders in making their decisions.
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