SlSHIP Boost with Waste Heat Recovery System (WHRS)
Fuel consumption is one of the largest cost items in ship operation. Remaining competitive over the long term will require highly efficient drive solutions and intelligent energy management. At the same time, environmentally friendly technologies are called for to comply with ever stricter environmental protection regulations. The WHRS (waste-heat recovery system) is the best way to meet both requirements.
Clean, efficient, flexible
WHRS uses exhaust gas from the diesel propulsion system to produce additional energy cleanly and inexpensively. By reducing energy costs by up to 12%, reducing CO2 and NOX emissions, and significantly lowering maintenance expenditures, the system gives you a competitive edge. You also gain more flexibility in vessel design. Smaller fuel tanks permit a more creative use of space and line, and the ship’s main drive can get by with a lower rated output. Dependable, internationally available, standard components and our well-established spare parts logistics facilitate maintenance and provide you with maximum reliability.
Versatile, powerful, safe
In two-stroke direct drives, the WHRS turns the hot combustion gases into superheated steam (HP and LP) that drives a 2-stage steam turbine. The surplus combustion gas not needed by the turbocharger can be used to feed an exhaust gas turbine. Together with the steam turbine, the exhaust gas turbine drives the power generator (waste-heat recovery principle), which generally provides all on-board power. At full load, the surplus electrical energy can be used to assist the ship’s drive by means of an elecric drive that acts directly on the propeller shaft. At low main engine load, the waste heat recovery system can be operated in parallel with a DG set. Even parallel operation with a shaft generator (PTO operation) is easily implemented.
All the functionalities of the WHRS are controlled using an energy management system that ensures optimal use of the available energy and automatically adapts shaft generator operation to current requirements. That means you are able to access additional power reserves, reduce wear and tear on the main engine, and increase the reliability of the on-board power supply.