Concept of magnetic-induced gas cleaning filter regeneration – Fundamental investigation of particle structure detachment from a magnetizable single fiber

  • Tagung:

    FILTECH 2023, The Filtration Event

  • Tagungsort:

    Cologne, Germany

  • Datum:

    14.02.-16.02.2023

  • Autoren:

    J. Szabadi, J. Meyer, A. Dittler

  • Magnetic forces can generally be used for deposition as well as for the detachment processes of particle structures. Either the collectors, the particles or both can be magnetized. Magnetic separation between particle structures and collectors is already well established in the field of solid-liquid separation and also allows separation of particles in the lower submicron size range on an industrial scale (Ladislav 2001; Svarovsky 2000).

    The use of magnetic effects, such as magnetic-induced motion excitation for the regeneration of individual filter fibers (in the field of depth filtration) or entire filter media (in the field of surface filtration), could also find application in the field of gas-particle separation technology. However, there are no studies in literature dealing with the separation of non-magnetizable particle structures from ferromagnetic fibers by exploiting magnetic effects. The detachment of non-magnetizable particle structures depends on the structural build-up of the particle layer to be detached and the loading of the fiber (Löffler 1972; Müller 2017). Therefore, knowledge of the morphology of the particle layer and the total load is of high significance. It is expected that the different morphology of particle structures will also result in differences in the detachment behavior.

    For the fundamental investigation of the novel regeneration concept by magnetic forces, the detachment of non-magnetic particle agglomerates will be performed using a single ferromagnetic fiber (Figure 1). The fiber is fixed on one side and is magnetized and deflected by the application of an external magnetic field (Helmholtz coils). If the inertial forces acting on the particle agglomerates due to the acceleration of the fiber are greater than the adhesive forces, the agglomerates detach from the fiber.

    The presented work aims to introduce the novel concept of magnetic-induced cleaning and to present first findings on magnetic-induced particle detachment.