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SAFETY4SEA

Siemens to equip UASC containerships with environmental friendly technology

by The Editorial Team
July 10, 2014
in Smart
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CO2 emissions reduced by approx. twelve percent

The Siemens Drive Technologies Division is equipping 17 container ships owned by the United Arab Shipping Company (UASC) with an environmentally friendly drive and power generation system (Siship SGM) under contract from Hyundai Heavy Industries, the largest shipyard in the world.

  • Waste heat recovery system enables fuel-efficient and therefore cost efficient operation of container ships
  • CO2 emissions reduced by approx. twelve percent

Siemens to equip UASC containerships with environmental friendly technology

Using a waste heat recovery system (WHRS), exhaust gas from the propulsion main engine is utilized to produce additional electrical power from the ship’s exhaust gas in a clean and efficient manner. This enables power to be generated with a lower overall fuel consumption while simultaneously reducing CO2 emissions by up to twelve percent.

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The drive system is a shaft generator which operates both as motor or generator and is automatically adapted to suit the requirements in hand by a higher-level power management system. This enhances the efficiency and flexibility of the power generation process as well as reducing wear on the main drive and the auxiliary generators.

The class A-14 and A-18 UASC container ships have a carrying capacity of 14 500 and 18 800 TEU respectively and are among the largest container vessels in the world. Due to the loaded cargo, the ships have significant power requirements which can be optimized with highly-efficient drive solutions and an intelligent power management concept.

For this reason, Siemens relies for the UASC container ships on a WHRS which generates superheated steam from the hot exhaust gas and in turn drives a two-stage steam turbine. An additional exhaust gas turbine can be fed with excess exhaust gas that is not needed for turbocharging.

Together with the steam turbine, it drives an electric generator which generally supplies the entire on-board electric power system. Due to the WHRS fuel consumption is reduced by up to twelve per cent.

To achieve the maximum propulsion power on the shaft line surplus electric power can be used to boost the ship’s propulsion system by means of the shaft generator and the Sinamics S120 frequency converter in the so-called power take-in (PTI) mode.

The generator is mounted directly on the propeller shaft without gears and affects it directly. At low main engine load, it operates as a generator in power take-off (PTO) mode to supply the electric mains. In this case the auxiliary engines can be switched off if the total power balance does allow. This leads to more efficient electric energy generation and reduces the wear and therewith also the maintenance costs of the auxiliary engines.

All functionalities of the WHRS are controlled by a power management system which ensures optimal use of the available energy, and automatically adjusts the shaft generator operation to match actual requirements. This utilizes reserve capacity, reduces the wear on the main propulsion system and the auxiliary generators, and increases the reliability of the on-board power supply.

“Together with UASC we worked as partner to adopt and comply with the very complex technical specifications from UASC. Due to extraordinary reduction of fuel cost the total cost for container transportation will be reduced significantly. This fuel saving also results in lower CO2 emissions of the same amount” said Stefan Kraus, Head of Strategy, Marine and Shipbuilding of the Siemens Drive Technologies Division.

Source & Image Credit: Siemens

Siemens to equip UASC containerships with environmental friendly technology
Siemens to equip UASC containerships with environmental friendly technology
Tags: container shipsHHIship technologySiemensUAEUASC
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