Influence of diesel additives on the water separation efficiency in diesel water separators

R. Bernewitz*, M. Veit, A. Oraby, L. Wommer, J. Reyinger, H. Banzhaf, Mann+Hummel GmbH, Germany

As the injection pressures in engine systems continue to rise, sensitive components are increasingly affected by particles and water. The latter can be present in fuels dissolved or as droplets (free).

Although the fuel quality is regulated by industrial standards (e.g. DIN EN 590), water can directly get into the tank through filling actions, transport, storage and especially through tank ventilation or it can get into the tank in the form of air humidity. If dispersed water reaches the injection system, it can cause corrosion and microbiological induced corrosion (MIC), inadequate lubrication and it can lead to abrasion by cavitation. One solution to separate water from diesel is to increase the mean droplet size by induced coalescence and subsequent to separate the droplets via gravity and differing density. Coalescence can be induced by retardation of droplets on the surface of and within the structure of coalescer media. Here, surface properties play a major role. The performance of coalescer media can change during the lifetime of a coalescer element. It can be found in literature that surfactants which are provided by additives adsorb on the surfaces and change the surface properties.

In this work, investigations on the influence of additives on the diesel-water separation efficiency are presented. The influence of surfactants on the water separation efficiency of in-situ multistage water separators was investigated separately from a particle contamination. Current limits, trends and influencing parameters are outlined....

Session: L16 - Fuel Filtration I - Water Separation
Day: 13 October 2016
Time: 10:45 - 12:00 h

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