Technologies reducing exhaust gas emissions from large marine diesel engines

Diesel engines manufactured today demonstrate impressive gains in engine fuel economy and reliability over engines produced a decade ago. Better turbocharging and fuel injection have resulted in much higher thermal efficiencies, but this increase in thermal efficiency has resulted in higher firing pressures and temperatures - and an attendant rise in NOx emissions. This paper discusses various technologies that are available for retrofit on existing engine installations and for new engines. Chosen technologies have been compared in terms of their quantitative efficiency.