【作者】

Steffen Bots

【摘要】

该论文已在赫尔辛基举行的第28届CIMAC世界大会上发表，论文的版权归CIMAC所有。 At times when engines are only operating at partial load due to slow steaming, condensation occurs in the engine, causing corrosion which will deteriorate further if insufficient lubricant is supplied, but will not improve by adding too much engine oil. To ensure that the main engine of a ship works reliably and efficiently over several years and for well over one hundred thousand hours of operation, even under extremely unfavourable operating conditions, it requires excellent maintenance and effective control mechanisms. If the injection of the heavy fuel oil can also be optimised as part of the engine management, along with optimised feed rates for cylinder oil, the immense operating costs can be significantly reduced. After all, a large, slow-speed 2-stroke diesel engine requires up to 25 tonnes of HFO fuel per cylinder per day. Moreover, large ship engines consume up to 2,000 litres of cylinder oil per day with their 12 or even 14 cylinders. The 2-stroke marine diesel in particular, with an output of over 100,000 HP, is a hard worker with plenty of stamina. These are mostly operated with HFO (heavy fuel oil). Its quality not only varies constantly but it is also contaminated, above all, with sulphur. Then there are also impurities, such as water, salt, nickel, vanadium and cat- fines. These finegrained aluminium and silicone compounds have an abrasive effect like that of sand. They originate from the treatment of the HFO with a catalyst which is called cat-fines. HFO fuel and its fluctuating feed rates that depend on its quality pose a constant challenge for engines and their lubrication. The volume of lubricant, which is provided for each cylinder with an individually set dosing pump, needs to be continuously adjusted for the fuel and the operating conditions of the engine. The more sulphur the fuel contains, the higher the concentration of additives needs to be to neutralise the sulphuric acid and the combustion residues. In order to determine how heavily contaminated the lubricating oil is and whether more or less should be fed in, the cylinder oil running down from the liner is analysed with rapid test equipment, often on board the ship itself. Another option is the much more precise analysis of the drain oil, often called SDA analysis, in the laboratory. The detailed analysis shows opportunities for significant cost savings due to cylinder oil feed rate optimization. Further, they can ensure that no excessive corrosion or wear is occurring in the engine. But some key aspects for the analysis have to be considered: •Professional sampling equipment •Global availability and sample shipment •Combination of the right test procedures •Professional reporting •Speed and cost effectiveness

【会议名称】

第28届CIMAC会议

【会议地点】

芬兰 赫尔辛基

【下载次数】

3

返回