Advanced CO_2 Exhaust Heat Recovery For Tomorrow's Energy-Efficient Ships

摘要

Integrating a promising marine application. Increasing fuel costs and stricter emissions requirements in the marine industry are compelling owners and operators to re-evaluate the impacts and economics of ship power plants. These trends set the stage for expanded use of energy efficient technologies on commercial and military vessels. One promising solution is exhaust heat recovery (EHR) using carbon dioxide (CO_2) as the working fluid. This technology offers the desired benefits of increased fuel efficiency coupled with marine-friendly features such as compactness and low maintenance requirements. Using similar thermodynamic cycle principles that have been in practice for over 100 years - but replacing traditionally used steam with CO_2 - these systems improve upon the many benefits of a proven technology. The recovery of exhaust energy is most commonly performed using a steam cycle. Cargo and cruise ships and other vessel types use exhaust heat boilers to produce steam from the exhaust stream. Steam has numerous auxiliary uses aboard a ship including space heating, power for auxiliary machinery, fuel heating, operating the galley and, in some cases, powering a steam turbine to produce electricity. Gas turbine powered vessels have also adopted steam bottoming cycles to increase overall system efficiency.