【作者】

Jonathan Hughes

【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。 The gas engine market is currently seeing an increase in the demand for greater specific power outputs from engines. To meet this demand engine manufactures are introducing design changes into modern gas engines aimed at increasing overall engine efficiency. These design changes frequently involve the introduction of tighter tolerances and reduced clearances for engine components e.g. reduction of the height of the piston top land to reduce piston weight and minimise methane slip. These design changes have in turn led to an increase in the temperatures observed by the lubricant and greater pressures generated during engine operation to provide the required efficiency gains. With these increased demands many current additive technologies may struggle to provide the same level of performance over the oil drain duration as is achieved in today’s hardware, potentially resulting in a necessity to reduce the oil drain interval. The impact of shorter oil drain intervals is that any efficiency gains achieved by the design changes will be impacted by the need to shut down the engine sooner than envisaged to perform an oil drain or undertake preventive maintenance. Therefore, to meet the demands of these new high efficiency engines, the formulation of the lubricant additive system needs to be optimised, or even enhanced to provide better protection in the increasingly challenging chemical environment. Higher performance lubricants will allow modern gas engines to be operated at higher temperature and pressures for longer periods ensuring the performance of the engine (with respect to running time, running temperatures and pressures) to be maximised. This will therefore allow higher efficiency and higher power outputs to be achieved without an increased risk in engine damage. In this respect additive component choice becomes critical in providing the necessary protection required. This paper will describe the effects that additive component selection can have on prolonging lubricant life in a modern high efficiency gas engine for example the impact that detergent choice can have upon the cleanliness (to counteract deposit formation) and acid control (due to increased organic acid species) within the engine; the role dispersant plays in supporting the detergent in preventing deposit formation within the ring pack together with the crucial impact of antioxidants and anti-wear protection. A correctly tailored chemical additive package can help reduce the risk of ring sticking, bore polish, filter-plugging and bearing damage in a modern gas engine. To support the additive package the choice of base oil is also found to be crucial in defining robust lubricating oils for the future engine demands.

【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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