Modern fuel injection systems need to be protected from particles and water, causing wear on the system. A state-of-the-art fuel-water separator can reliably ensure a high purification by using multiple stages. The separated water is temporarily stored in collection space and needs to be drained regularly.
A fully automatic drain system removes the water when the sensor detects a certain level in the water collection chamber. Since the drained water is usually not collected automatically (e.g. in an extra tank), it should be cleaned prior to the release into the environment. A suitable adsorber removes the HC from the water phase.
The water that is separated by the fuel-water separator can be either clear or turbid. Whilst low additivated fuels usually lead to a clear water phase, an ultra-low sulfur diesel (ULSD) contains a high amount of additives and the drained water will be turbid due to the formation of a diesel in water emulsion. Why is this important? The solubility limit of diesel in water is reasonably low, approximately < 10 mg/l acc. DIN EN ISO 9377-2 H53 but an emulsion contains in average > 200 mg/l HC with levels up to > 2500 mg/l.
Activated carbon (AC) is the commonly used material in either systems that are already running on the street or are in a concept status, but only little evidence is found in the literature that activated carbon is actually suitable for this application. Experiments show that....
Session: L19 - Liquid/Liquid Separation
Day: 24 October 2019
Time: 14:45 - 16:00 h