【作者】

Jean-Philippe Roman

【摘要】

该论文已在芬兰赫尔辛基举行的第28届CIMAC大会上发表。论文的版权归CIMAC所有。The 2-stroke low speed engines with high BMEP are particularly sensitive to cold corrosion. It depends, among other factors, upon the sulphur content of the fuel, the operating load, and the lube oil feed rate. The cold corrosion occurrence can lead to corrosive wear and, as a matter of fact, to strong damages for the engine liners. To avoid failures, the engine manufacturers (OEMs) recommend monitoring on a regular basis the engine by checking the residual base number (BN) and the iron content (Fe) of the cylinder lube oil (CLO) sampled at the bottom of the liners. The BN and the Fe are generally determined by on-shore laboratory analysis because reliable techniques and standardized procedures are applied. However the timing to get the information while in operation is extended and sometime inappropriate to prevent engine failures. Therefore alternative solutions for BN and Fe determination on-board are proposed to the users. But sometime such alternatives are time consuming for the crews, require particular skills or are still questioned for their reliability. The advantage of doing the BN and Fe analysis onboard is then counterbalanced by the risk of taking inappropriate actions. We propose an alternative that combines the advantages of the existing solutions and provides additional perspectives. It is an on-line system that ensures the automatic sampling of the lubricant from the cylinder units, the continuous determination of 6 parameters including the BN and the Fe, the processing and the reporting of the data with indications on actions to take if necessary. This On-line Reporting System (ORS) combines novel sensors and a genuine automatic sampling system. It stands in small volume, is simply connected to the drain oil pipes and operates without particular maintenance (no additional work for the crew). The ORS maintenance and update is based on an exchange of parts or sensors if necessary and on regular upgrade of the software. The ORS is ideal for the chief engineer to monitor in real time the critical parameters of the CLO on-board the vessel, but for the fleet managers as well because data can be sent on-shore. In a basic configuration, the data are acquired continuously, processed and finally visualized in the engine room by using the vessel management IT system. However more sophisticated data treatment and management can be tuned upon user needs. Therefore the ORS is a very powerful tool to prevent corrosive wear, but also to finely optimize the LOFR according to the actual vessel environment or sailing condition. In this paper we describe the ORS and how it operates. We review the parameters measured and we show the reliability of the measurements. We report on the tests in service during long haul voyages of the vessel. We finally propose various ways to value the data provided by the ORS.

【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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