【作者】

Stefan Mayer

【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 novel MAN B&W LGI engine design aims at enabling low speed marine diesel engines to operate on a large variety of low flash point fuels, like LPG or methanol. In the present paper the design details of the LGI concept will be shown and its adoption to methanol operation will be discussed. This includes the methanol LGI fuel booster injection system, pilot injection system ensuring ignition, double wall piping of all methanol containing pipes thus eliminating the risk of methanol contamination of the engine room, safety systems, etc.. The LGI-methanol concept has been so far tested on two engines; a four cylinder 50 bore LGI test engine and a 7S50ME-B9.3-LGI production engine and results from both will be presented and discussed, The engines operate on both diesel oil and methanol with the same rating and according to the standard performance layout of the base-line diesel engine. The tests show very good performance when operating on methanol. The NOx emissions levels for methanol were found to be approximately 30% lower for methanol than for diesel oil, given same load and operating conditions. The specific fuel oil consumption was at the same time found to be better for methanol than for diesel oil. The measured CO emission was comparable to that for diesel oil operation, while HC emissions were measured to somewhat higher. The NOx reduction accompanied with methanol operation can be traded into an additional SFOC improvement when optimizing the overall engine performance with respect to IMO Tier II NOx limits. The general conclusion is that the tests have shown a very successful demonstration of the operation of MAN B&W low speed two stroke engines on methanol. The first LGI-methanol engines are scheduled for sea trial in 2016.

【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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