Abstract
The fuel efficiency of marine diesel engine as any combustion engine falls with raising the temperature of air at the suction of its turbocharger. Therefore, cooling the engine turbocharger intake air by recovering exhaust gas heat to refrigeration capacity is a very perspective trend in enhancing the fuel efficiency of marine diesel engines. The application of water-fuel emulsion (WFE) combustion enables the reduction of a low-temperature corrosion, and, as a result, provides deeper exhaust gas heat utilization in the exhaust gas boiler (EGB) to the much lower temperature of 90–110 °C during WFE instead of 150–170 °C when combusting conventional fuel oil. This leads to the increment of the heat extracted from exhaust gas that is converted to refrigeration capacity by exhaust heat recovery chiller for cooling engine turbocharger sucked air accordingly. We experimentally investigated the corrosion processes on the condensation surfaces of EGB during WFE combustion to approve their intensity suppression and the possibility of deeper exhaust gas heat utilization. The fuel efficiency of cooling intake air at the suction of engine turbocharger with WFE combustion by exhaust heat recovery chiller was estimated along the voyage line Mariupol–Amsterdam–Mariupol. The values of available refrigeration capacity of exhaust heat recovery chiller, engine turbocharger sacked air temperature drop, and corresponding reduction in specific fuel consumption of the main low-speed diesel engine at varying actual climatic conditions on the voyage line were evaluated.
Highlights
Low-speed internal combustion engines are the most widespread as main engines in marine applications [1]
Deep utilization of exhaust gas heat of diesel engines is limited by the lowtemperature corrosion processes of exhaust gas boiler (EGB) surfaces
The application of water-fuel emulsion (WFE) combustion enables the reduction of a low-temperature corrosion (LTC), and as result utilization of exhaust gas heat, making it possible to reduce engine fuel consumption and, the amount of harmful emissions
Summary
Low-speed internal combustion engines (diesel engines) are the most widespread as main engines in marine applications [1]. The ambient air temperature variation along the voyage lines influences the fuel efficiency of the engines. An increase in engine turbocharger sucked air temperature by 1 ◦ C causes specific fuel consumption increase by. While sailing in warm climatic conditions when the main engine load is higher than 50%, the exhaust gas heat utilized by the exhaust gas boiler (EGB). Thereby, it is reasonable to use the excessive exhaust heat by ejector chiller (ECh) as the simplest in design [3,4] for engine turbocharger sucked air cooling to enhance fuel efficiency [5,6]. The efficiency of water-fuel emulsion (WFE) combustion is higher as compared with convention fuel oil combustion due to microexplosions of WFE droplets, which intensifies mixing of fuel with air and combustion processes in the whole. The raised fragmentation of WFE droplets leads to reduction of the particle emission
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