School of Environmental Science and Engineering, Donghua University, Shanghai 201620, China.
Int J Environ Res Public Health. 2019 Jan 16;16(2):247. doi: 10.3390/ijerph16020247.
The main objective of this study was to determine the effect of filter pore size and fiber diameter on the performance of the baghouse filters for ultra-low emission. In this study, three kinds of conventional polyester filter (depth filtration media) and two kinds of polytetrafluoroethylene membrane-coated polyester filter (surface filtration media), having various filter pore sizes and fiber diameters, were tested to determine the performance of static and dynamic filtration. In order to determine the static filtration performance, the filtration resistance and the filtration efficiency of the clean filter media were measured by the arrestance method. The dynamic filtration performance experiments were conducted to determine the dynamic resistances, dust depositions, and dynamic filtration efficiencies of the dust-containing filter media under the condition of dust airflow filtration through a pulse-cleaning cycle. In the dynamic filtration performance experiments, the size of 50% test dust was less than 2.5 μm, and the mass mean aerodynamic diameter of the dust was 1.5 μm. The filtration velocity was 2 m∙min, and the dust concentration was 18.4 g∙m. The static filtration performance experiments showed that the filter pore size greatly affected the filtration resistance and the filtration efficiency of the fabric structure of the surface filtration media. In the depth filtration media, the filtration efficiency and the filtration resistance of the fabric structure were improved when the filter pore size and the fiber diameter were smaller in magnitude. For all the five filter media, smaller the pore size of the filter media, greater was the filtration precision (for fine particles, such as PM) of the fabric structure. In the dynamic filtration performance experiments, the filter pore size and the fiber diameter of the depth filtration media affected the dynamic filtration resistance and the dynamic filtration efficiency of the depth filtration media by affecting the deposition rate of dust in the depth filtration media; however, the filter pore size of the surface filtration media affected the blocking rate of dust in the membrane micropores, thus influencing the dynamic filtration resistance and the dynamic filtration efficiency of the surface filtration media.
本研究的主要目的是确定过滤孔径和纤维直径对袋式除尘器实现超低排放性能的影响。在这项研究中，测试了三种常规聚酯滤料（深层过滤介质）和两种聚四氟乙烯膜涂覆聚酯滤料（表面过滤介质），它们具有不同的过滤孔径和纤维直径，以确定静态和动态过滤的性能。为了确定静态过滤性能，通过捕集率法测量清洁过滤介质的过滤阻力和过滤效率。通过进行动态过滤性能实验，确定了含尘过滤介质在脉冲清灰周期下通过含尘气流过滤时的动态阻力、粉尘沉积量和动态过滤效率。在动态过滤性能实验中，50%测试粉尘的粒径小于 2.5μm，粉尘的质量中值空气动力学直径为 1.5μm。过滤速度为 2m·min，粉尘浓度为 18.4g·m。静态过滤性能实验表明，过滤孔径对表面过滤介质的织物结构的过滤阻力和过滤效率有很大的影响。在深层过滤介质中，当过滤孔径和纤维直径较小时，织物结构的过滤效率和过滤阻力会提高。对于所有五种过滤介质，过滤介质的孔径越小，织物结构的过滤精度（对于细颗粒，如 PM）越高。在动态过滤性能实验中，深层过滤介质的过滤孔径和纤维直径通过影响深层过滤介质中粉尘的沉积速率来影响深层过滤介质的动态过滤阻力和动态过滤效率；然而，表面过滤介质的过滤孔径影响了膜微孔中粉尘的堵塞率，从而影响了表面过滤介质的动态过滤阻力和动态过滤效率。
