MAHLE fuel filtration system


The new MAHLE modular filter element concept for the water separation within the diesel fuel filter considers different requirements coming from the fuel injection system.

Main parameters for the water separation are the flow rate and the sizes of the water droplets which need to be separated. Flow rates vary between 150 – 600 l/h for standard common rail systems and 1.500 l/h for pressure amplified systems. The higher the flow rate, the more difficult the water separation because the water separation mechanism in the fuel filter always depends on the flow velocities and therefore on the flow rates.

The water droplet size depends on the location of the fuel filter/water separator. In principle the water separation could be located at the suction sided pre-filter in front of the fuel pump or at the pressure sided main filter behind the fuelpump. Water droplet sizes for suction sided applications are in the range of 50 – 300 µm, for pressure sided applications at around 10 µm or even lower.

Depending on the flow rates and water droplet sizes different water separation concepts can be applied to the new modular fuel filter element concept.

This concept starts with a simple 1-stage water separation for suction sided filters. In this separation the big water droplets from the tank are separated at the hydrophobic filter media itself.
A reduced water separation efficiency due to the contamination of the filter media and changed water separation performance could be a problem.

The next expansion stage is a 2-stage concept with a hydrophillic filter media. In this separation the water droplet are coalesced to bigger drops and then separated at a final water separator (hydrophobic mesh).

At high flow rates the use of a certain 2-stage coalescing media can be applied. Finally the separation of the coalesced water droplets can be optimized with a certain spin element.

All of these different water separation concepts can be applied with the new MAHLE modular water separation as a construction kit strategy to guarantee an optimal water separation efficiency. At the same time it reduces costs and development time.

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http://www.mahle.com

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MAHLE is a leading international development partner and supplier to the automotive industry as well as a pioneer for the mobility of the future. The MAHLE Group is committed to making transportation more efficient, more environmentally friendly, and more comfortable by continuously optimizing the combustion engine, driving forward the use of alternative fuels, and laying the foundation for the worldwide introduction of e-mobility.

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