【作者】

Kenneth Widell

【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。The possibility to mix gas and liquid fuel could be a useful feature for vessels where the quantity of the boil-off gas is not sufficient for providing the needed vessel speed but where there still is a need to use the boil-off gas to a certain extent. In order to meet the demands from the market, this feature has now been introduced to Wärtsilä gas engines and the first ships have been delivered with this function in early 2015. Two main aspects of the operation have been emphasized in the development of the function. First of all is the robustness of the function, which means that the fuel sharing function has to be safe to use and the performance of the engine cannot be compromised regarding operation and loading. The second aspect is the operating area regarding both engine load and the gas and liquid fuel ratios to be used. The paper will present how the fuel sharing operating area has been defined according to optimal engine operation and how the engine will operate in this area and how the engine will be controlled if the operating area needs to be exceeded. The fuel sharing function has also been introduced as a new fuel mode, and tests and demonstrations have been carried out for classification societies and customers in order to release the function. Several failure mode operations have been demonstrated, and the paper will show how the engine behaves at different situations when running in the fuel sharing mode. Situations like loss of gas or loss of liquid fuel must be well defined in the engine automation system to have a safe operation of the ship even in an abnormal or failure situation. The ship operator also needs to know the impact on the engine performance when operating in the fuel sharing mode. This has been mapped all over the fuel sharing operating area, and the impact on engine emissions and engine total efficiency has been defined from these tests. With the new released function, the ship operator has been given yet another feature that will improve the flexibility of the ship operation.

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

2

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