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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
EFFECTS OF INERTIZATION PROCESS IN CONFINED SPACES WITH APLLICATION IN THE AERONAUTICAL INDUSTRY
Submission Author:
Edwin Santiago Rios Escalante , SP , Peru
Co-Authors:
Christian Jeremi R. Coronado, Eliana Vieira Canettieri, João Carvalho, Edwin Santiago Rios Escalante
Presenter: Edwin Santiago Rios Escalante
doi://10.26678/ABCM.COBEM2017.COB17-2788
Abstract
A long time ago, you have heard about accidents by gas explosion, and the destruction that they can cause. To be able to avoid it requires the understanding of what a gas explosion is and what can reduced the frequency and consequences of these events. The upper and the lower flammability limits (UFL and LFL, respectively) are the maximum and the minimum concentration of the fuel in the air, respectively, in which a flame propagate, they are considered key tools in the prediction of fire, evaluating the possibility of explosion and design of protection systems. There is an interest in finding the flammability limits of ethanol mixed with an inert gas at reduced pressure as a safety measure for the future used of this biofuel in aeronautical applications, taking into account the typical altitude of a commercial airplane (<40 000 ft.). In this work the flammability of hydrated ethanol (5,18%vol. Water) was evaluated experimentally and the nitrogen was used as inert gas. The experimental bench was build according with the norm ASTM E-681. The ethanol was injected using a precision syringe with 1 ml of volume, nitrogen and air was injected using partial pressure law of Dalton. The method for measure the flammability was by visual observation of flame propagation. The results plotted as a function of the additions of nitrogen shows that when the initial pressure decreases, the UFL decreases and both the LFL and the limit oxygen concentration (LOC) increases. In addition, the variation of UFL is more noticeable than the LFL when the percentage of nitrogen increase in the ethanol/air mixture.
Keywords
Flammability Limits, Inert gas, Nitrogen, Hydrated ethanol, Visual criteria, Experimental measure
