Emission and economic performance analysis of dual fuel marine engine
By adding a gas injection system to the intake manifold,a marine engine is converted into a dual-fuel diesel/CNG engine.Bench tests are performed in fuel mode,fuel mode with SCR and dual-fuel mode to explore its emissions and economy.The results show that the NOx emission of the engine in dual-fuel mode can reach the emission level of the fuel mode with SCR,which meets the Tier Ⅲ of MARPOL Annex Ⅵ for NOx emission.However,the manifold intake results in high HC and CO emission,which makes it difficult to meet the emission standard for marine engines in China(GB 15097-2016).MARPOL Annex Ⅵ does not impose any restrictions on dual-fuel diesel/CNG engines with high HC and CO emissions,an omission that needs to be reviewed and improved.Both the engine fuel mode with SCR and the dual fuel mode meet Tier Ⅲ standards.However,the dual-fuel mode is more cost effective than the engine-fuelled mode when the ship on which the engine is installed navigates in the MARPOL Annex Ⅵ emission control area.The results of the study are expected to serve as a reference for ship operation management and the revision of MARPOL Annex Ⅵ.
dual fuel engineemission performanceeconomic performanceanalysis and evaluation
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