Method for determination of flammability limits of gaseous compounds diluted with N-2 and CO2 in air

Autor(es)

Mendiburu, Andres Z. ^[1] ; de Carvalho, Jr., Joao A. ^[1] ; Coronado, Christian R. ^[2]

Afiliação do(s) autor(es)

^[1] Sao Paulo Univ UNESP, Sch Engn, Energy Dept, BR-12510410 Guaratingueta, SP - Brazil

^[2] Fed Univ Itajuba UNIFEI, IEM, Ave BPS 1303, BR-37500903 Itajuba, MG - Brazil

• Tipo de documento: Artigo Científico
• Fonte: FUEL; v. 226, p. 65-80, AUG 15 2018.
• Citações Web of Science: 2

Resumo

The present work studies the flammability limits of combustible-diluent-air mixtures at 25 degrees C and 1 atm pressure. The diluent species, considered in this study, were nitrogen and carbon dioxide. A factor called k(FL) was obtained from mass and energy conservation, this factor relates the flammability limit of a combustible-air mixture to that of a combustible-diluent-air mixture. The factor k(FL) varies with diluent concentration. Nevertheless, it was shown that an average value of this factor (k(FL)(av)) av can represent, with good accuracy, the variation of the flammability limits with diluent concentration. An empirical method to determine the flammability limits of combustible-diluent-air mixtures was developed. The method approximates k(FL)(av) by means of correlations. For the total set of experimental data, it was found that, for dilution with N-2 and CO2 respectively: (a) at the LFL the Average of the relative errors (AARE) were 4.02% and 7.01%, the squared correlation coefficients (R-2) were 0.9833 and 0.9660; and (b) at the UFL the AAREs were 3.91% and 5.57%, the R-2 were 0.9920 and 0.9792. At the Fuel Inertization Point (FIP) there is an inert concentration above which the mixture is non-flammable. A method was developed to determine the diluent mole fraction in the combustible-inert mixture at the FIP. The AAREs of 0.82% and 1.95% were obtained for dilution with N-2 and CO2, respectively. (AU)

• Processo FAPESP: 15/23351-9 - Propagação e supressão de chamas de misturas etanol anidro - ar.
• Beneficiário: Andrés Armando Mendiburu Zevallos
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado