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

通过表面过滤器去除气体中的颗粒，颗粒层的定期构建和分离决定性地决定了过滤器的性能。除了特定类型的负载外，再生的质量和持续时间主要取决于颗粒层和过滤介质表面之间的粘附力（粘附力）以及颗粒层结构本身的强度（内聚力）。粘附力和内聚力由过滤介质上的滤饼结构决定性地确定。滤饼的形成以及由此产生的再生行为受到过滤介质的表面特性的影响。对这些相互作用还没有一个合理的理论描述。人们知道，滤饼去除后，过滤器表面仍然覆盖着一层薄薄的颗粒。由于与沉积颗粒的大小相比，过滤介质通常具有微观粗糙的表面结构，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期局部不均匀的层结构。由此产生的粘附力的不均匀分布影响颗粒层的分离行为至关重要。详细的研究尚不清楚。研究项目的主要目的是从实验和理论上（由模拟支持）研究作为不同的、定量表征的、不均匀的、微观上不均匀的过滤介质表面（包括它们的近表面多孔过渡区）的函数的下滤饼区域中的特征颗粒层结构的构建;这导致了某些不均匀的粘合力分布，就尺寸和它们的空间分布而言，本文首次探讨了颗粒层特性与分离性能之间的定量关系，- 滤饼在多个操作阶段的释放行为的变化，以及过滤介质表面的定量参数;从相应地表征任何过滤介质的表面纹理开始，可以定量地预测再生操作中介质的行为变化。新创建的基础知识将通过提高能源效率（成本）和更高的材料效率（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).