Publicação
Optimization of the gas filtration process by reducing the amount of particulate matter emitted into the atmosphere
| Resumo: | Currently, in the gas filtration processes, the presence of electrostatic charges in the particles has been shown to contribute positively to the performance of the filter medium. Due to its high competitiveness in the market for gas-solid separation equipment, the hybrid filter has shown great benefits, being able to operate with low-pressure drop and high collection efficiency for fine particulate matter, increasing the useful life of bags, besides reducing the expenses with energy and maintenance of filtration equipment should be very important for environment. Hybrid filters are the combination of two or more gas-solid separation equipment with the aim of improving the gas filtration process decreasing the particulate emission on the environmental. In this purpose, this work to evaluate the effect of the electrostatic charge applied to the particles, during the formation of the dust cake filtration in a glass fiber filter medium. Was investigated the particle size distribution of the particles, the specific resistance of the dust cake and the porosity of the filter cake using the Ergun equation with an electrostatic charge of -4, -10 and -12 kV. Images were obtained in a scanning electron microscope (SEM) to determine the behavior of the particles during the deposition in the filter media, the mean particle diameter and the experimental porosity of the filter cake. For the -4 kV loads applied to the particles, the specific resistance of the dust cake, the pressure drop as a function of the collected mass and the filtration time were estimated and it was verified that the specific resistance of the dust cake and the pressure drop decreased while the amount of particulate material retained in the filter media and the total filtration time increased. At the tensions of -10 and -12 kV where the corona effect was active, the electrostatic precipitator retained 89% of the particulate material fed in the process and thus the penetration of the particles in the tissue decreased and the filtration time increased by up to 6 times for a -12 kV curve. The filtration tests showed a positive influence of the electrostatic charge on the particles during the formation of the dust cake. Being able to improve the filtration process in the industries and at the same time reduce the emissions of particulate materials in the environment. |
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| Autores principais: | Rodrigues, Marcus Vinícius |
| Outros Autores: | Aguiar, Mônica; Silva, Flávia |
| Assunto: | Environment control Air filtration Particulate matter Bag filter Electrostatic charge |
| Ano: | 2021 |
| País: | Portugal |
| Tipo de documento: | documento de conferência |
| Tipo de acesso: | acesso aberto |
| Instituição associada: | Instituto Politécnico de Beja |
| Idioma: | português |
| Origem: | Repositório Institucional do IPBeja |
| Resumo: | Currently, in the gas filtration processes, the presence of electrostatic charges in the particles has been shown to contribute positively to the performance of the filter medium. Due to its high competitiveness in the market for gas-solid separation equipment, the hybrid filter has shown great benefits, being able to operate with low-pressure drop and high collection efficiency for fine particulate matter, increasing the useful life of bags, besides reducing the expenses with energy and maintenance of filtration equipment should be very important for environment. Hybrid filters are the combination of two or more gas-solid separation equipment with the aim of improving the gas filtration process decreasing the particulate emission on the environmental. In this purpose, this work to evaluate the effect of the electrostatic charge applied to the particles, during the formation of the dust cake filtration in a glass fiber filter medium. Was investigated the particle size distribution of the particles, the specific resistance of the dust cake and the porosity of the filter cake using the Ergun equation with an electrostatic charge of -4, -10 and -12 kV. Images were obtained in a scanning electron microscope (SEM) to determine the behavior of the particles during the deposition in the filter media, the mean particle diameter and the experimental porosity of the filter cake. For the -4 kV loads applied to the particles, the specific resistance of the dust cake, the pressure drop as a function of the collected mass and the filtration time were estimated and it was verified that the specific resistance of the dust cake and the pressure drop decreased while the amount of particulate material retained in the filter media and the total filtration time increased. At the tensions of -10 and -12 kV where the corona effect was active, the electrostatic precipitator retained 89% of the particulate material fed in the process and thus the penetration of the particles in the tissue decreased and the filtration time increased by up to 6 times for a -12 kV curve. The filtration tests showed a positive influence of the electrostatic charge on the particles during the formation of the dust cake. Being able to improve the filtration process in the industries and at the same time reduce the emissions of particulate materials in the environment. |
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