Investigation into the influence of the macro- and microstructure of textile filter media to the periodic detachment of mineral dust layers of inert particles with the aim of quantitative forecasting of long-term operating performance of cyclical regenera

表面过滤器从气体中去除颗粒，定期建立和剥离颗粒层决定了过滤器的性能。除特定的加载类型外，再生的质量和持续时间主要取决于颗粒层与过滤介质表面之间的附着力（粘附性），以及颗粒层结构本身的强度（内聚性）。滤饼在过滤介质上的结构决定性地决定了其粘附力和内聚力。滤饼的形成和再生行为受到过滤介质表面特性的影响。对这些相互作用的合理理论描述尚未成功。据了解，滤饼去除后，过滤器表面仍包覆着一层薄薄的颗粒。与沉积颗粒的大小相比，过滤介质通常具有微观上粗糙的表面结构，因此在滤饼和过滤介质之间的近表面多孔过渡区域的截面中，预计会出现局部不均匀的层状结构。由此产生的粘附力的不均匀分布对颗粒层的分离行为影响至关重要。详细的调查尚不清楚。该研究项目的主要目的是通过实验和理论（以模拟为支持）研究不同的、定量表征的、不均匀的、微观上不均匀的过滤介质表面（包括其近表面多孔过渡区）在下滤饼区域形成特征颗粒层结构的函数；这导致在尺寸和空间分布方面存在一定的不均匀粘附力分布，从而相应地影响颗粒层特性的分离行为。首次探讨了滤饼在多个操作阶段的释放行为变化与过滤介质表面定量参数之间的定量关系；从相应的表征任何过滤介质的表面纹理开始，可以在定量的基础上预测再生操作中介质行为的变化。新创建的基础知识将通过提高能源效率（成本）和提高材料效率（寿命），在可持续性概念方面进入工业实践。

Particle removal from gases with surface filters, periodic building and detachment of particle layers decisively determine the performance of the filter. Except on the particular type of loading, the quality and duration of regeneration depends mainly on the adhesion between the particle layer and the filter medium surface (adhesion), and the strength of the particle layer structure itself (cohesion). The adhesive and cohesive forces are decisively determined by the structure of the filter cake on the filter medium. The formation of the filter cake and thus the regeneration behaviour are influenced by the surface characteristics of the filter media. A sound theoretical description of these interactions has not yet succeeded.It is known that, after the filter cake removal, the filter surface is still coated with a thin layer of particles. As filter media in comparison with the magnitude of the deposited particles generally have a microscopically rough surface structure, a locally inhomogeneous layer structure is expected in the sectional planes of the near-surface, porous transition region between the filter cake and the filter medium. The resulting inhomogeneous distribution of adhesive forces affects the separation behaviour of the particle layer crucial. Detailed investigations are not yet known.Main aim of the research project is to experimentally and theoretically (supported by simulations) investigate the building of characteristic particle layer structures in the lower cake region as a function of different, quantitatively characterized, inhomogeneous, microscopically uneven filter media surfaces including their near-surface porous transition zones; this results in certain inhomogeneous adhesive forces distributions, in terms of size and in terms of their spatial distribution, which in turn affect the separation behaviour of the particle layer characteristics accordingly.For the first time it will be explored the quantitative relationship between the change of the release behaviour of the filter cake across multiple operating stages, and the quantitative parameters of the filter medium surface; starting from the correspondingly to characterize surface texture of any filter medium, a prediction of the change in the behaviour of the medium in the regeneration operation is possible on a quantitative basis. The newly created basic knowledge will work its way into industrial practice in terms of the sustainability concept, both through improved energy efficiency (cost) and a higher material efficiency (life-time).