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Waste heat recovery systems

Using a waste heat recovery system (WHRS) to increase the energy output from combustion engines is becoming an increasingly viable way to reduce fuel costs.Through the WHRS, the recovered energy is converted back for mechanical work.

 

The waste heat recovery system

The system

The Main engine’s exhaust gases are channelled to a turbo generator, where the power for the vessel is produced. WHRS uses the heat, flow and pressure from the excess exhaust gas, which
rotates the generator and feeds the main electrical grid onboard the vessel.

Benefits

The recovered energy, which is typically up to 4% of the main propulsion shaft’s power output, is converted for electricity through the PTG WHRS. Essentially, the WHRS allows a vessel to produce more power at a very low cost, simply, by harnessing the excess power provided by the vessel’s
main engine.

Benefits

The initial cost of the WHRS will be covered by the fuel savings made during the operation of the vessel. The WHRS can be optimized to met the required level of efficiency and tailored for the specified propulsion plant. Based on these main parameters, the payback time can be estimated in advance relative to the prevailing cost of fuel and the operational profile of the ship.

Benefits

Energy efficiency is increased, and emissions reduced. WHRS allows for flexibility and redundancy in power plant operation, for example less operating hours for auxiliary engines at sea if so desired.

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References

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