Pre-filter design of high efficient multilayer filter medium for pulse cleanable filter elements for challenging atmospheric conditions

F. Heuzeroth*, Hengst SE, Germany

The filter medium is the most important part of any filter element. It is possible to distinguish filter media into two major classes.

Surface filter media separate the dispersed phase mainly on the first layer of its embodiment. Particles which are bigger than the pore size of the first media layer start to build a filter cake on top of the material. The interaction between the filter medium and the separated particles are very week.

Depth filter media are the second material class. These separate the particles, depending on their size either on top of the media or in the depth of the material. This enable depth filter media to store a high volume of particles or humidity with a comparable low influence on its pressure drop.

Surface filter media are very suitable for pulse cleaning applications due to the point of particle deposition. But they react very sensitive on challenging atmospheric conditions like sticky dust or high humidity in combination with fine dust or salt. These conditions can lead to irreversible blockage of the surface filter media which requires a complete change of the used filter stage in the final application. Especially in air intake systems for gas turbines or turbo compressors this will lead to a loss of production capacity and thus very high cost for the plant owner.

Based on this knowledge it was the aim to design a filter media which merges the advantages of a depth filter with the high efficiency and cleanability of a surface filter media. To achieve this contrary aims the design of the filter media is crucial...

Session: G13 - Filter Element Design
Day: 24 October 2019
Time: 09:00 - 10:15 h

Learn more at FILTECH 2019 - Register Now!