【作者】

Hendrik Lange

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC大会上发表，论文的版权归CIMAC所有。ABSTRACT For years now, the industry, media and conferences on marine propulsion are putting a strong focus on gas as a marine fuel. One of the important enablers for the development of this concept from being accepted in a niche market in Norway to becoming a viable scenario for ECA-applications and even been taken into account for intercontinental traffic was the arrival of the dual fuel engine. The concept of being able to run on gas as a fuel while keeping the diesel fallback option for the case of gas supply shortage or problems with the more sophisticated engine and fuel system controls encourage ship owners to invest. For the time being, a kind of standard dual fuel engine concept has evolved for medium speed 4-stroke engines. There are of course important differences in the systems details, but the common features for a competitive dual-fuel engine today are gas supply via port-injection, AFR-control by the use of a wastegate and/or a compressor bypass valve, a pilot injection system for gas ignition, variable valve timing and in most cases an in-cylinder pressure measurement system supporting the engine control system. All these systems have their value for the engines capabilities, partly with no alternative at all, partly with advantages in terms of emissions and efficiency compared to alternative systems. And they have their cost. In a study conducted at Caterpillar different alternative and simpler dual fuel concepts were investigated in terms of engine performance and emissions on a testbed. Based on these results the overall profitability for the ship owner was analyzed looking at different market and application scenarios. Special attention was paid to the requirements of gas retrofits of vessels already in service. The results of the economic analysis depend heavily on the assumptions made for the fuel price development, especially on the price relation between liquid and gaseous fuels. But despite these strong dependencies, some basic lessons can be learned.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

3

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