These investigations [1,2] contribute to the understanding of ash behaviour in wall-flow filters used as diesel particulate filters. The experimental part of the investigations identifies relevant parameters influencing ash deposition and ash transport in particulate filters. In the simulative part, a comprehensive numerical model is being developed which can describe the behaviour of ash particles and soot burn-off during active filter regeneration at a molecular level.

    Within the scope of the experimental investigations, engine ash from the field is first examined in detail. By determining essential boundary data, a suitable ash substitute is selected, which is used in a specially adapted wind tunnel to load DPF samples with the ash substitute within a short time. In parallel, ash loading of various DPF substrates is carried out under real conditions in a rapid ashing system consisting of a car engine and a fuel oil burner. Suitable analytical methods are then developed and selected, with which the loaded DPF samples can be characterized with regard to their deposition patterns. The characterizations are carried out by means of optical microscope, SEM, EDX, CT and optical evaluation methods.

    The main parameters influencing the ash movement are the regeneration temperature, the type of regeneration and the flow velocity. According to the results, a hot, discontinuous regeneration at high flow velocity, preceded by a continuous passive regeneration above the balance point, tends to produce a dense ash plug at the end of the channel, which increases the ash storage capacity of the DPF. Furthermore, evidence is identified that ash detachment from the wall can be implemented even with pure continuous regeneration.

    In the simulative part of this project, several models are developed to describe the interaction of volumetrically dissolved particles and their oxidation. By developing for the first time a method based on the decomposition of the STL geometry into segments of half-spaces, the time required for the computation can be reduced immensely. The developed models are able to represent the transport behaviour of matter in a flowed through DPF channel and also the influence of temperature on the transport behaviour.


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    Titel :

    Ash Behaviour in Wall-Flow Filters


    Weitere Titelangaben:

    Proceedings


    Beteiligte:
    Bargende, Michael (Herausgeber:in) / Reuss, Hans-Christian (Herausgeber:in) / Wagner, Andreas (Herausgeber:in) / Schneider, Lukas (Autor:in) / Kaul, Matthias (Autor:in) / Braschke, Kamil (Autor:in) / Eilts, Peter (Autor:in) / Schmidt, Eberhard (Autor:in) / Janoske, Uwe (Autor:in)

    Erschienen in:

    Erscheinungsdatum :

    2022-03-14


    Format / Umfang :

    18 pages





    Medientyp :

    Aufsatz/Kapitel (Buch)


    Format :

    Elektronische Ressource


    Sprache :

    Deutsch




    Flow maldistribution measurement in wall-flow diesel filters

    Stratakis,G.A. / Stamatelos,A.M. / Univ.of Thessaly,GR | Kraftfahrwesen | 2004



    Flow maldistribution measurements in wall-flow diesel filters

    Stratakis, G A / Stamatelos, A M | SAGE Publications | 2004