Combined Gas Turbine Electric and Steam (COGES) – Definition and Pronunciation
What is COGES?
COGES (Combined Gas Turbine Electric and Steam) is a hybrid power system that couples a gas‑turbine generator with a steam turbine, using the gas turbine’s exhaust heat to generate steam for additional electricity. This configuration boosts overall plant efficiency and reduces fuel consumption compared to a standalone gas turbine.
Examples of COGES
Innovations like Steam Turbine and Gas Engine (STaGE) systems combine the benefits of both steam and gas propulsion, while COGES (Combined Gas and Electric) configurations optimize fuel consumption. Understanding these cutting-edge technologies is essential for navigating the future of marine propulsion.
From “Exploring Different Turbine Propulsions for Liquefied Gas Carriers”.
One further consideration is that the LNG carrier will rely on the additional COGES system’s functionality to perform the service condition (19,5 knots), which will degrade the overall propulsion system availability.
From “Fuelling the Future – Powering the LNG Carriers”.
Gas turbines could be used as electric power generators. We have not chosen them for several reasons: gas turbines alone are not efficient enough, a steam recovery plant is needed (other recovery systems are not proven); for efficiency reasons, steam plant should include a vacuum condenser i. e. a steam plant similar to present LNG carriers, which means cost and complexity; one gas turbine in a COGES mode offers the power needed. For redundancy and safety reasons a back-up system is needed, logically a spare gas turbine which is again costly.
From “The New Generation of Liquefied Natural Gas Carriers – Basic Design Philosophy”.
Pronunciation of COGES
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