Ship Engine Intake Air Cooling by Ejector Chiller Using Recirculation Gas Heat

Abstract

AbstractOne of the promising ways in environmental protection of the marine internal combustion engines (ICE) is the neutralization of harmful substances in exhaust gas through engine gas recirculation (EGR) technology . However, the use of such techniques conflicts with the engine's energy efficiency and leads to increased fuel consumption. It is promising to use technologies that would increase fuel and energy efficiency of ICE with EGR systems and combine high environmental efficiency with engine fuel efficiency. The technology of precooling intake air at the suction of turbocharger by waste heat using chiller (WHUCh) was developed for ICE with the EGR system. The advantage of this solution is the possibility of using the waste heat of recirculation gases to reduce the heat load on the scrubber recycling system and fuel consumption. The scheme-design solution of the EGR system using the heat of recirculation gas by an ejector chiller (ECh) for cooling the air at the intake of the main ship engine is proposed. The effect of using the heat of recirculation gas for cooling engine intake air is analyzed, taking into account the changing climatic conditions on a vessel's route line. It is shown that using the heat of recirculation gas for cooling engine intake air by ejector refrigeration machine reduces the air temperature at the entrance of the main engine by 5–15 °C, which decreases the specific fuel consumption by 0.5–1.4 g/(kW∙h). It reduces emissions of harmful substances (NOx by 26–38%; SOx by 9–14%) when the engine is running with recirculation of gas.KeywordsHarmful emissionsExhaust gas recirculationEjector chillerSpecific fuel consumptionEcology