【作者】

Henrik Rolsted

【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。This paper share the experience gained with the first generations of Tier II NOx compliant MAN B&W engines in the Costamare fleet. The paper tells how- and why combustion chamber Cold Corrosion re-appeared, how corrosive wear was controlled and how MAN Diesel & Turbo have reduced the corrosive level on the latest Tier II engines. The previous MAN B&W engines were known by having a very low corrosive level, needing very little alkali neutralisations from the cylinder oil. In cases where this was not respected and the engines instead over-lubricated, the result was sometimes scuffing of the cylinder liners and piston rings due to bore polish. To increase the safety margin against such over-additivation, the oil industry developed cylinder oils with a lower alkali level. These oils were known as mid-range cylinder oils and typically had an alkali level between 55BN and 60BN. MAN Diesel & Turbo have fulfilled prevailing Tier II legislation, i.e. a maximum NOx limit 14.4 g/kWh, among others by means of “2-stroke Miller Timing”. Basic ingredients are a high scavenge air pressure, late closing of the exhaust valve and part load optimisation.

【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

返回