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LOW-SPEED ENGINESEGR SOLUTIONSAdditional to Tier III dual fuel and SCR solutions, exhaust gasrecirculating (EGR) concepts might be commercially viable for certainapplications. Wärtsilä 2-stroke is further developing this concept anddevelops own EGR resolutions available upon request.High-Efficiency Waste Heat Recovery (WHR)Waste heat recovery is an effective technology for simultaneouslycutting exhaust gas emissions and reducing fuel consumption. High-Efficiency Waste Heat Recovery plants can be installed with Wärtsiläengines. This enables up to 10% of the main engine shaft power tobe recovered as electrical power for use as additional ship propulsionpower and for shipboard services. These WHR plants thus cut exhaustgas emissions and deliver fuel savings of up to 10%.Steam based WHR has already been successfully fitted in severalinstallations to Wärtsilä low-speed marine engines. In the WHR plant,a turbo-generator combines input from a steam turbine and an exhaustgas power turbine to generate electrical power, while steam from theeconomiser is available for ship service heating. Steam based WHR isrecommended for vessels with high installed power.Exhaust gaseconomizerSteamturbineShip service steamShip service powerTurbochargersMotor/generatorExhaustturbineAux. enginesMain engineSchematic of a High-Efficiency Waste Heat Recovery plant typical for largecontainer ships.87