Navegando por Assunto "Controle de poeira"

Agora exibindo 1 - 3 de 3

Acesso aberto (Open Access)
Cálculo de ar induzido pela queda livre de materiais granulares via CFD
(Universidade Federal do Pará, 2021-12-17) LIMA, Leandro Ferreira Borba; MESQUITA, André Luiz Amarante; http://lattes.cnpq.br/1331279630816662
The proposal of the work consists of presenting an analysis method via ANSYS-Fluent using the DDPM tool (Dense Discrete Phase Model) of the integrated Eulerian multiphase model, a better understanding of the flow of granulated material with the adjacent induced air due to the drag provided by the free-falling particles, which result in the generation and propagation of dust, avoid simulations with materials where particle density and diameters are variable. The use of this analysis tool will make it possible to improve and improve de dusting projects in industries that work with granular materials that emit dust. The simulations carried out were compared with other computational methods and practical experiments, in addition to previous theoretical formulas.
Acesso aberto (Open Access)
Determinação experimental da vazão de despoeiramento na descarga de carvão coqueificável
(Universidade Federal do Pará, 2021-02-26) CHAVES, Gabriel Guedes; MESQUITA, André Luiz Amarante; http://lattes.cnpq.br/1331279630816662
Dust control mechanisms during industrial processes are often carried out using spray nozzle methods or exhaust systems, equipped with bag filters. The following work aims to develop an experimental method to determine the volume of exhaust in different quantities of materials and different heights of material discharge. A test protocol is presented to design exhaust systems for any material, mass flow and drop height, using an experimental method in which it simulates the material drop in order to evaluate experimental dedust flow rates for an industrial ventilation system. A literature review of the current empirical models of exhaustion volume is presented. The methodology is correlated through the concentration of respirable particles measured by the measurement equipment with the exhaust flow data. The results presented are for coal, comparing existing and suggested correlations with experimental data for three different heights of fall. It is hoped, therefore, to support design engineers in the design of industrial exhaust systems, reducing the damage caused by fine particles in workers and in the population that lives near the polluting source.
Acesso aberto (Open Access)
Procedimentos experimentais para avaliação da emissão de poeira em manuseio de minério
(Universidade Federal do Pará, 2018-11-29) SANTOS JUNIOR, Ronaldo Menezes dos; MESQUITA, André Luiz Amarante; http://lattes.cnpq.br/1331279630816662
The generation of dust during the handling and transportation of bulk causes a series of problems, such as the erected air and loss of valuable material. Due to the risk associated with inhalation of dust, several control mechanisms have been adopted. The use of water is a viable option to inhibit the generation of dust, although the use of chemical suppressants is in some cases more appropriate. However, standards and methods for characterizing the generation of particulates are not very consolidated in the literature, for the proper selection of the control mechanism. Therefore, this study aimed to develop test methodologies to evaluate the emission of minerals particulate. The emission of particulate during transport was evaluated in a test bench developed by adapting an existing wind tunnel, using a wagon model and air speeds of 40 km/h and 70 km/h, for different iron ore moisture values. Results show that the increase in flow speed increases the loss of material mass contained inside the wagon model and the increase in material moisture significantly reduces the loss of mass, being enhanced with the use of dust suppressants applied to the material surface. To simulate material handling, a bench was developed using the dust tower technique concept, which allows dust generation tests during material discharge. In the results obtained, it is also verified that the increase in material moisture significantly reduces the emission of particulates, being more evident for materials that have a higher percentage of fines. The influence of suppressants was also evaluated, and among the tested reagents Fe2(SO4)3 showed the best result for the pellet feed milled, greatly reducing the emission of particulates in relation to the use of water only. For pellets, Ca(OH)2 showed the best results without curing time and CaCl2 for the condition with curing time of 2 hours. Therefore, the results show that the benches and experimental procedures developed, presented satisfactory and coherent results, which are reliable for the characterization of the emission of particulates from different materials.