Abstract

Marine lubricants’ ability of dispersing Heavy Fuel Oil (HFO) can be quantitatively observed and evaluated with an efficient and economic method: heating capillary video microscopy. Effects on HFO dispersion included those of surfactants’ type, over-basing level and temperature, while also discussing what Carbon chain lengths can be expected to perform better. For same-chain-length surfactants, samples with higher concentration of base showed lower ability of dispersing HFO. Samples with medium surfactants chain length and no overbased particles, dispersed up to 81% of the HFO at 100 °C in 200 seconds. Dispersion of HFO happened mostly at the beginning of its introduction to lubricant oils, while undispersed HFO remained almost intact even after days. Discussion is provided on the possible asphltene dispersing action of surfactants, reflecting on Total Base Number (TBN) and surfactant chain length, which are important parameters in optimizing lubricant formulations.

摘要

船用润滑油分散重燃料油 (HFO) 的能力可以通过一种有效且经济的方法进行定量观察和评估：加热毛细管视频显微镜。对 HFO 分散的影响包括表面活性剂的类型、高碱性水平和温度，同时还讨论了哪些碳链长度可以预期表现更好。对于相同链长的表面活性剂，碱浓度较高的样品对 HFO 的分散能力较低。具有中等表面活性剂链长且无高碱性颗粒的样品，在 100 °C 下在 200 秒内分散了高达 81% 的 HFO。HFO 的分散主要发生在其引入润滑油的开始阶段，而未分散的 HFO 甚至在几天后仍几乎完好无损。讨论了表面活性剂可能的沥青烯分散作用，