Abstract
Baghouse filters are used 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 rises. A good performance of a baghouse filter is closely linked to the correct flow distribution inside it, whether in the hopper or in the bags. Other important variables for good performance are internal speed, filtration rate (RAP), pressure drop, cleaning efficiency, etc. The upgrading of existing bag filters to current standards is a major challenge for the industry, generally due to, among other factors, emission regulations and common physical and dimensional constraints of the existing equipment. Computational Fluid Dynamics analysis (CFD) can help deal with this problem because it makes possible to perform several analyzes at a lower cost and with great result accuracy when compared with the traditional approaches. In this work, the analysis of an existing bag filter, which presents serious problems of premature discharging of components due to nonuniformity in the internal distribution of the flow, is performed. This analysis has several steps, among them, 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 and to identify possible dimensional changes to improve flow uniformity.
Highlights
Existing environmental standards have become increasingly restrictive because of growing concerns about climate change, employee and public health
The baghouse filter is the most used in the industry because it has high collection efficiency for inhalable particles
The objective of this work is to find a better distribution of the pressure profile and velocity within the dirty air chamber of the bag filter, so the variables to be evaluated will be the velocity in the three directions ݑ(=݅ݑ1, ݑ2, ݑ3) and pressure , because there is no heat transfer or chemical reactions
Summary
Existing environmental standards have become increasingly restrictive because of growing concerns about climate change, employee and public health. The need emerged to control air quality, minimizing the amount of atmospheric pollutants released by the industrial sector. In this context, environmental protection systems have become increasingly important within industrial facilities, with the purpose of exhausting gases from the production process, containing particulate matter, providing separation and disposing of clean gases (particulate free) or containing particulate matter within the allowable limits. The baghouse filter is the most used in the industry because it has high collection efficiency (above 99%) for inhalable particles. Direct impaction is used as a particle capture mechanism.
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