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ENCIT 2020
18th Brazilian Congress of Thermal Sciences and Engineering
Determination of the CO2 and N2 dilution influence on flame flashback limits of methane and propane combustible mixtures
Submission Author:
MARIA CLARA DE JESUS VIEIRA , RJ , Brazil
Co-Authors:
MARIA CLARA DE JESUS VIEIRA, Luís Fernando Figueira da Silva
Presenter: MARIA CLARA DE JESUS VIEIRA
doi://10.26678/ABCM.ENCIT2020.CIT20-0157
Abstract
The flashback phenomenon in tubes has been known and studied for several decades. The classical analysis of this phenomenon is based on the determination of a critical velocity gradient that delimits the boundaries of flame flashback as a function of the mixture properties. However, significant knowledge gaps remain, particularly with regard to the effect of CO2 dilution, which is important for predicting the safety of Brazilian pre-salt facilities. Accordingly, the general objective of this work is to experimentally determine the influence of CO2 dilution on the flame flashback of gaseous air/hydrocarbon mixtures. In particular, the critical velocity gradient was determined for CH4/air mixtures with CO2-diluted fuel (0, 10 and 30%), and with N2dilution as well. For comparison purposes, measurements were also performed on propane/air mixtures diluted by CO2 or by N2. For both diluent species, a reduction in the maximum value of the critical velocity gradient was observed with the increase of the dilution. Such as behavior was associated to the corresponding decrease with dilution of the laminar flame speed.
Keywords
Premixed flame, Flame flashback, Critical velocity gradient, Experimental Study
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