【作者】

Henrik Rolsted,Rojgaard Charlotte,Jensen Ole

【摘要】

论文已在中国上海举行的第27届CIMAC大会上发表。论文的版权归CIMAC所有。Remains of Cat fines in the fuel oil en-program. Commercial methods such as Cat fines Size tering the engine account for a considerable part of the Distribution(CSD) screening adds an extra dimension wear of the combustion chamber components in two-by evaluating the particle size of the cat fines.A se- stroke engines. The attempt to lower the amount of vere cat fines attack has been monitored by measure-cat fines in fuel oil bunkers by the ISO 8217:2010 to ments of cylinder liner and piston ring wear through maximum 60 ppm has however not lowered the global online drain oil analysis. The results showed that the average content. On the contrary, increased use of wear dropped from an extremely high to normal level ECA fuel has lead to a significant increase in the num-few days after the supply of cat fines had stopped ber of cat fines related engine wear situations. Cat by changing of fuel and after manual cleaning of the fines entering the engine create wear by means of so-tanks. The conclusion is that cat fines damage over called 3-part abrasion. The sliding surfaces made of a long period of time is the result of a continuous flow cast iron are the most sensitive, as the cat fines has a of cat fines led to the engine, and that the wear is not tendency to embed into natural porosities of the cast stopped until manual cleaning of a contaminated sys-material structure and create wear on the counterpart. tem(including settling and day tanks). Proper lay-out Thereby cylinder liners, piston ring grooves and piston of tank and pipe connections of the fuel oil cleaning rings become the most affected components of two-systems onboard can prevent cat fines accumulation stroke engines. It is rare that cat-fine related dam-by continuously cleaning the tank bottoms. This in age is seen on the fuel equipment due to the high connection with optimised flow rate through the clean- hardness of those components. Recent statistic, in-ing system, taking advances of the fact that marine envolving 165 high cylinder and piston ring wear cases, gines mostly is operated at part load, may give a sigwhere replica technique have been used detecting cat nificant improvement of the cleaning efficiency. New fineparticles embedded in the liner surface, showed systems including settling-and day tank lay-out, recir-cat fines being the reason in 86% of the cases. This culation pipe connections with flow measuring device investigation has also shown that even small cat fine and dynamic control of the separator supply pumps particles below 10 micron contribute to the wear. Anal-are presented in the paper. Technologies, such as ysis results of the HFO bunkered in most of the high FSC, CSD, LinerScan and Cat Guard, have been used wear cases showed that the vessels in question had in combination with ' COCOS Engine Diagnostic Sys-bunkered fuel oil within the limits of the ISO 8217:2005 tem' to evaluate the correlation between cat fines conspecification. Consequently, the cause of the high centration and engine wear rates as well as the need wear may be found in either too low separation effi-to improve the fuel cleaning efficiency onboard. The ciency onboard, by settling and accumulation of cat paper will demonstrate that the risk of cat fines re- fines in the different tanks onboard or a combination of lated wear can be significantly reduced by ensuring both. This highlights the need of an approved method optimized fuel system treatment, by introducing a new specifying separator size and efficiency,e.g. Certified fuel cleaning system layout, by automatic control of the Flow Rate(CFR) or similar methods. It also calls for cleaning flow rate and by intensified monitoring of the regular checks of the onboard separation efficiency, fuel treatment efficiency.

【会议名称】

第27届CIMAC会议

【会议地点】

上海

【下载次数】

1

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