International Journal of Naval Architecture and Ocean Engineering

The Society of Naval Architects of Korea (대한조선학회)
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Internal modifications to reduce pollutant emissions from marine engines. A numerical approach

  • Lamas, M.I. (Department of Naval and Ocean Engineering, Universidade da Coruna) ;
  • Rodriguez, C.G. (Department of Naval and Ocean Engineering, Universidade da Coruna) ;
  • Rodriguez, J.D. (Department of Industrial Engineering, Universidade da Coruna) ;
  • Telmo, J. (Department of Agroforestry Engineering, Universidade de Santiago de Compostela)
  • Published : 2013.12.31
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Abstract

Taking into account the increasingly stringent legislation on emissions from marine engines, this work aims to analyze several internal engine modifications to reduce $NO_x$ (nitrogen oxides) and other pollutants. To this end, a numerical model was employed to simulate the operation cycle and characterize the exhaust gas composition. After a preliminary validation process was carried out using experimental data from a four-stroke, medium-speed marine engine, the numerical model was employed to study the influence of several internal modifications, such as water addition from 0 to 100% water to fuel ratios, exhaust gas recirculation from 0 to 100% EGR rates, modification of the overlap timing from 60 to $120^{\circ}$, modification of the intake valve closing from 510 to $570^{\circ}$, and modification of the cooling water temperature from 70 to $90^{\circ}C$. $NO_x$ was reduced by nearly 100%. As expected, it was found that, by lowering the combustion temperature, there is a notable reduction in $NO_x$, but an increase in CO (carbon monoxide), HC (hydrocarbons) and consumption.

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References

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