Space Efficient Container Vessel Powered by Liquid Natural Gas Fueled Combined Gas Turbine and Steam Turbine Electric Propulsion
Publication Date: 2016-Dec-05
The IP.com Prior Art Database
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Space Efficient Container Vessel Powered by Liquid Natural Gas Fueled Combined Gas
Turbine and Steam Turbine Electric Propulsion
Sea going container vessels, such as ultra large container ships (ULCS), are cargo ships designed to carry loads in truck-size cuboid containers. These containers are conventionally measured and referred to as either twenty-foot equivalent units (TEU) or with refrigerated cargo containers in forty-foot equivalent units (FEU).
Many conventional container vessels are powered by heavy fuel oil (or HFO). To meet extant power requirements in the vessel's engine room, HFO fueled container vessels typically require one or more slow or medium speed diesel engines, or one or more HFO fueled boilers supplying steam to steam turbines. Gas turbine vessels have traditionally been fueled by Marine Gas Oil (MGO) distillate fuels
It is, however, desirable to fit as many TEUs onto a container ship as possible, and as a consequence, it is also desirable to minimize, or eliminate, the space consumed by the engine room.
Liquid natural gas (LNG) is an ideal fuel for gas turbine engines. For example, using LNG, turbine inlet temperatures and, as a consequence, turbine efficiency can be increased in comparison to turbines fueled with MGO. Moreover, turbines receiving LNG as a fuel may operate with increased turbine outlet temperatures. LNG thus allows for the installation of high- efficiency steam turbines in combined cycle, which use the turbine exhaust gas to produce steam for electric power. For these reasons, Combined Gas Turbine Electric and Steam (COGES) turbine power generation is an efficient and economical mechanism for the conversion of fuel into shipboard electrical power. Modern stationary COGES plants running on natural gas may achieve net plant efficiencies of approximately 60%, as opposed to conventional diesel engines, which...