Análise da distribuição de ar em um filtro de mangas utilizando dinâmica dos fluidos computacional

Abstract

The baghouse filters are equipment used broadly of the industry to reduce the emission of pollutants in the atmosphere. With the stricter environmental regulations and the need to avoid the emission of pollutants into the atmosphere, the demand for better results in terms of collection efficiency and filtration becomes more and more. A good performance of a baghouse filter is closely linked to a correct flow distribution inside it, whether in the hopper or in the middle of the bags. Other variables are also of great importance for good performance, such as internal speed, filtration rate (RAP), pressure drop, cleaning efficiency, etc. The upgrading of existing bag filters to current standards is a major challenge at the plants, generally due to, among other factors, emissions regulations and common physical and dimensional constraints on existing equipment. Thus, the Computational Fluid Dynamics analysis (CFD) becomes a great ally because it is possible to perform several analyzes at lower cost and with great acuracy in the results obtained mainly when compared with the traditional approaches. In this work the analysis of an existing bag filter will be performed, which presents serious problems of premature discharging of components due to nonuniformity in the internal distribution of the flow. This analysis will have several steps, among them, the documentation survey, field survey, flow and pressure drop measurements (pressure differential between the clean side and the dirty side of the filter) with the aid of CFD, with the objective to raise pressure and velocity fields and to identify possible dimensional changes to improve the flow uniformity.