An Innovative variable layout steam plant for waste heat recovery from marine dual-fuel engines
Marco Altosole, Ugo Campora, Luigia Mocerino, Raphael Zaccone
Abstract
The paper describes an original Waste Heat Recovery (WHR) variable layout plant to produce steam from the exhaustgases of marine dual-fuel engines. A large part of the steam feeds an electric turbogenerator to improve the ship's energy efficiency.The layout of the proposed steam plant is conceived in a double configuration to satisfy both the stack temperature constraints of theengine exhaust gas, due to the use of diesel oil (no less than 160°C as outlet gas temperature) or natural gas (there are no particularstack temperature limits). The comparison with a traditional WHR single pressure steam plant shows the potential benefits of thevariable configuration. Indeed, the proposed solution allows a better exploitation of the potential thermal energy of the natural gas,without precluding a proper performance even in diesel mode, with a moderate weight increase compared to a single pressure WHR system.