4 months ago

Petromin marine and offshore Jan-Feb Issue

Propulsion Systems

Propulsion Systems Powering the Seas “ Compared to direct diesel drives, diesel electric propulsion systems are technically and operationally superior in virtually all applications. This superiority has been a major reason for the steadily growing demand for dieselelectric main drives in marine engineering applications. ” Diesel-electric transmission, or dieselelectric powertrain is used by a number of vehicle and ship types for providing locomotion. A diesel-electric transmission system includes a diesel engine connected to an electrical generator, creating electricity that powers electric traction motors. No clutch is required. Before diesel engines came into widespread use, a similar system, using a petrol (gasoline) engine and called petrol-electric or gas-electric, was sometimes used. Electrical propulsion system offers numerous advantages for ships that are subject to specific requirements. They are rated as particularly economical, environmentally friendly and reliable, offer considerable comfort in terms of operation and control, have optimal maneuvering and positioning properties, low vibration and noise levels, and additionally enable the best possible utilization of space owing to their reduced noise levels. Some modern diesel-electric ships, including cruise ships and icebreakers, use electric motors in pods called azimuth thrusters underneath to allow for 360° rotation, making the ships far more maneuverable. An example of this is the Harmony of the Seas, the largest passenger ship as of 2016. 42 January to February 2018

Siemens Schottel azimuth thrusters Gas turbines are also used for electrical power generation and some ships use a combination: the Queen Mary 2 has a set of diesel engines in the bottom of the ship plus two gas turbines mounted near the main funnel; all are used for generating electrical power, including those used to drive the propellers. This provides a relatively simple way to use the high-speed, low-torque output of a turbine to drive a low-speed propeller, without the need for excessive reduction gearing. Layout of Diesel Electric Propulsion The electrical propulsion arrangement for a ship is often described as a diesel-electric or turbo-electric system. It is characterized only by the type of prime mover with no reference to the type of electrical propulsion motor. When the Layout of diesel electric propulsion in ship January to February 2018 43

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