Fundamentals of applying magnetic effects for particle structure detachment from magnetizable fibers in gas-particle separation processes

气体清洁过滤器用于从气相中去除固体或液体颗粒。根据其结构和应用，过滤器可分为深度过滤器和表面过滤器。虽然深度过滤器通常不再生，但表面过滤器的再生通常通过压力脉冲的流动反向或流动反向来实现，并且在特殊情况下还通过机械振动或敲击来实现。在气粒分离技术中，利用磁效应将颗粒结构从收集器上分离在很大程度上是未开发的。磁效应可用于移动整个过滤介质或单个收集器。虽然整个介质的磁感应运动刺激可以使表面过滤器再生，但是对于深层过滤器，单个过滤纤维的运动刺激将是更可想象的。单纤维的研究已被证明有助于研究气粒分离技术中深度过滤领域的基本过程，这就是为什么本项目旨在通过对铁磁单纤维的磁刺激来研究结构分离的基本原理，并随后扩展到纤维阵列。单侧固定的单纤维用作不可磁化的颗粒材料的收集器，并且通过施加交变磁场而被磁化和设置成运动。因此，颗粒粘附力可以通过适当的加速来克服，并且颗粒结构分离。在由许多可磁化纤维制成的可能的过滤器元件中，加载的纤维之间的附加碰撞过程也可以支持再生。当在表面过滤器中使用可磁化纤维时，新颖的再生概念将避免暂时的流动逆转，并且在过滤器内/气流中不需要额外的机械移动部件，这显著地促进了系统在高温下和在流动逆转不可能的应用中的使用。此外，过滤器的有针对性的清洁也是可能的。由于颗粒结构的分离取决于要分离的颗粒层的结构组成和纤维负载，因此这些研究的重点是不同颗粒结构的分离和负载高度的影响。通过改变分离参数，将产生扩散/过渡/惯性范围内的颗粒结构。由于不同的结构组成，预期在分离期间颗粒结构上的不同类型的应力。该项目的目的是获得磁感应过滤器再生潜力的基本了解。

Gas cleaning filters are applied to remove solid or liquid particles from the gas phase. Depending on their structure and application, filters can be divided into depth filters and surface filters. While depth filters are typically not regenerated, the regeneration of surface filters is usually achieved by flow reversal of a pressure pulse or flow-reversal, and in special cases also by mechanical shaking or tapping. The use of magnetic effects for detachment of particle structures from collectors is largely unexplored in gas-particle separation technology. Magnetic effects could be used to move entire filter media or individual collectors. While a magnetically induced movement stimulation of an entire medium could regenerate surface filters, the movement stimulation of individual filter fibers would be more conceivable for depth filters. Studies with single fibers have proven useful for investigating the fundamental processes in the field of depth filtration in gas-particle separation technology, which is why this project aims to investigate the fundamentals of structure detachment through magnetic stimulation on a ferromagnetic single fiber and subsequently expand to a fiber array. One-sided fixed single fibers serve as collectors for non-magnetizable particulate material and are magnetized and set in motion by applying an alternating magnetic field. As a result, the particle adhesion forces can be overcome by appropriate acceleration, and the particle structures detach. In a possible filter element made up of many magnetizable fibers, additional collision processes between the loaded fibers could also support regeneration. When magnetizable fibers are used in surface filters, the novel regeneration concept would avoid temporary flow reversal, and no additional mechanical moving components would be necessary within the filter/in the gas stream, which significantly facilitates the system's use at elevated temperatures and in applications where flow reversal is not possible. Furthermore, targeted cleaning of the filter is also possible. Since the detachment of particle structures depends on the structural composition of the particle layer to be detached and the fiber loading, the focus of these studies is on the detachment of different particle structures and the influence of the loading height. By varying the separation parameters, particle structures in the diffusion/transition/inertial range are to be generated. Different types of stress on the particle structures during detachment are expected due to the different structural compositions. The aim of this project is to gain a fundamental understanding of the potential of magnetically induced filter regeneration.