Marine Diesel Engine Waste Heat Recovery System on Car Carrier Trial

By George Backwell at August 25, 2012 07:14
Filed Under: General

A system that puts waste heat from main engine plant to productive use by adding to ship's electrical supply has been installed by Swedish manufacturers Opcon Marine aboard  Wallenius Lines' car/truck carrier MV Figaro, and is reportedly being tested and fine-tuned. This fuel-saving technology is suitable for marine diesel engines sized 5 MW and upwards, and promises typical bunker savings on a 15 MW engined vessel of between 5 and 10 percent.

Energy Sources and Electrical Power Schematic: Image courtsesy of Opcon Marine

Opcon Powerbox Offers Two WHR Systems

Powerbox utilises waste heat recovery (WHR) by means of two separate technologies, and both have been installed in the machinery space of MV Figaro.

  • Opcon Powerbox WST (Wet Steam Turbine), is a special type of steam turbine that generates electricity from wet or saturated steam that does not require overheating, unlike other, more conventional steam turbines.
  • Opcon Powerbox ORC (Organic Rankine Cycle), utilises low-value heat from jacket water and purge-air cooling systems.

The larger sized ORC unit, mainly taking waste heat from scavenge air, jacket water and lubricating oil can supply at most up to 500kW. The smaller WST unit is powered by surplus steam through the exhaust gas system.

In combination aboard Wallenius’s MV Figaro the two units are expected to result in a fuel saving  around 4 – 6 percent, but the potential in other installations is likely to be between 5 and 10 percent according to the manufacturers.

Loading the Opcon Powerbox ORC Unit: Photo courtesy of Opcon Marine

Car/Truck Carrier MV Figaro

Over the past two years Opcon Marine has collaborated with Wallenius Lines in a project supported by the Swedish Energy Agency aimed at adapting Opcon’s technology for marine application; measures to save fuel having commendable envirionmental as well as commercial justification of course.

This modern 74,258 gt ship MV Figaro, with a LOA of 227-m (745-ft) has a capacity for 7,879 cars or a combination of 3,508 cars and 432 buses.

The main engine is a B&W 8S60ME-C8 electronically controlled directly reversible marine diesel with constant pressure super-charging and a maximum output of 19,040 kW at 105 rpm.

In a separate compartment of the engine room there are two 450 V, 60 Hz, 1,700 kW AC-generators installed each powered by a STX/MAN-B&W diesel engine, type 9SL21/31H. In addition the vessel is equipped with a 1,100 kW shaft generator and an emergency diesel generator with a capacity of 215 kW.

MV Figaro: Photo credit Wallenius Lines






Comments (3) -

Great, the subject is the most important now a days.Most of the ship owners looking forward to do so.

Dr. Adel Tawfik |     9/1/2012 4:17:59 AM #

Good article for students of Marine engineering .Keep the good work-RG

Ranjith Gurugamage |     9/5/2012 11:30:21 AM #

This must be a be replacement type as I remember the one sailed on had a waste heat system on it. Will they put it on their other RO/RO's

Michael Novak |     9/12/2012 10:28:22 AM #

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