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

研究纺织过滤介质的宏观和微观结构对惰性颗粒矿物粉尘层周期性脱离的影响，目的是定量预测循环再生器的长期运行性能

• 批准号: 251833911
• 负责人: Professor Dr.-Ing. Eberhard Schmidt
• 金额: --
• 依托单位: Institut für Partikeltechnologie (IPT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2014
• 资助国家: 德国
• 起止时间: 2013-12-31 至 2018-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/251833911?language=en
• 关键词: Investigation; into; influence; macro; microstructure

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).

用表面过滤器去除气体中的颗粒、周期性的堆积和颗粒层的分离决定了过滤器的性能。除特定类型的负载外，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性(粘附性)，以及颗粒层结构本身的强度(粘聚力)。粘附力和内聚力由滤料上滤饼的结构决定。滤饼的形成和再生行为受滤料表面特性的影响。对这些相互作用的理论描述还没有成功。众所周知，在滤饼去除后，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、多孔过渡区域的横截面上预计会出现局部不均匀的层结构。由此产生的粘附力的不均匀分布对颗粒层的分离行为具有至关重要的影响。该研究项目的主要目的是从实验和理论上(在模拟的支持下)研究不同的、定量表征的、非均匀的、微观上不均匀的滤料表面(包括其近表面多孔过渡区)在下滤饼区域的特征粒子层结构的建立；这导致了某些粘附力在大小和空间分布上的不均匀分布，进而影响颗粒层特性的分离行为。首次探索了滤饼在多个运行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；从相应地表征任何过滤介质的表面结构入手，可以在定量的基础上预测介质在再生操作中的行为变化。新创建的基础知识将通过提高能源效率(成本)和提高材料效率(寿命)，在可持续发展概念方面应用于工业实践。