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Reference.org
Combined gas and steam
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<p>Combined gas and steam (COGAS) is a type of <a href="/facts/Marine_propulsion/fmjXgupn">marine propulsion</a> system comprising <a href="/facts/Gas_turbine/JJJNwXrG">gas</a> and <a href="/facts/Steam_turbine/scacVXsB">steam</a> turbines, the latter being driven by steam generated using the heat from the exhaust of the gas turbines. </p>