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Santos A.A.B.,Centro Integrado Of Manufatura E Tecnologia Cimatec | Santos A.A.B.,Federal University of Bahia | Torres E.A.,Federal University of Bahia | Pereira P.A.P.,Federal University of Bahia
Journal of the Brazilian Chemical Society

The concept of energetic efficiency in equipments is highlighted nowadays, due to its implication with the global warming issues. Amongst industrial equipments, burners have one of the greatest impacts on this discussion, since they are large scale combustion devices. The search for more efficient burners is of paramount importance, toward a more adequate use of the fossil fuels, during the transition phase between this energy source and new alternatives, which may last more than fifty years. The present work brings an evaluation of the Oxygen Enhanced Combustion technique (OEC), identifying important issues, especially those related with the heat transfer and emission of pollutants, and discussing its application in the oil industry and its supply chain, where the OEC is barely used. As far as the authors could search in the literature, there are no published critical reviews regarding the use of OEC and its implications in the oil and gas industry. © 2011 Sociedade Brasileira de Química. Source

Lovatte E.,Federal University of Espirito Santo | Lovatte E.,Instituto Federal Of Educacao Tecnologica Do Espirito Santo Ifes | Feroni R.,Federal University of Espirito Santo | Furieri B.,Federal University of Espirito Santo | And 6 more authors.
HARMO 2014 - 16th International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, Proceedings

The aim of the present paper is to investigate the fluid flow pattern near a free surface (liquid phase) to quantify the amount of odorous compound (e.g., hydrogen sulphide) transferred by volatilization to the atmosphere (gas phase). Turbulent flow structures beneath the interface define the turbulent flux of a scalar in the fluid flow. This study presents the turbulent flow near the air-water interface with negligible deformation (quiescent liquid surface). The transport equations of mass, momentum and mass of a chemical specie were solved by means of computational fluid dynamic technique. Large Eddy Simulation (LES) was employed with dynamic sub-grid scale model to take into account the turbulence effects. Direct Numerical Simulations (DNS) data were used to validate the mathematical and turbulence models as proposed in this work. The values of global mass transfer coefficients obtained in the numerical simulations were in good agreement with predicted KL values found in the literature. The results have shown that LES is suitable for investigating the basic principles of gas exchange in gas-liquid interface in quiescent surfaces, allowing for the present paper the specific investigation of the effects of Schmidt numbers on the global mass transfer coefficient. © Crown Copyright 2014 Dstl. Source

Santos A.A.B.,Centro Integrado Of Manufatura E Tecnologia Cimatec | Santos A.A.B.,Federal University of Bahia | Torres E.A.,Federal University of Bahia | Pereira P.A.P.,Federal University of Bahia
International Communications in Heat and Mass Transfer

The effect of OEC on soot formation and thermal radiation was studied in confined acetylene diffusion flames. Confined flames are widely used in industrial settings. The flames were produced in a combustion chamber with a burner operating with a parallel annular coaxial flow of the oxidizer. The soot concentration was calculated by the laser-induced light extinction method. The thermal radiation was measured with a radiometer in the narrow band of influence of soot radiation. The oxygen content in the combustion air was less than 30% - 21 to 25% - which does not require significant retrofitting of existing equipment when combustion conditions are varied. The results suggest that the use of OEC enables soot formation and thermal radiation in confined acetylene flames to be managed and controlled. © 2012 Elsevier Ltd. Source

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