title: Estimation of lower flammability limits of C-H compounds in air at atmospheric pressure, evaluation of temperature dependence and diluent effect.
abstract: Estimation of the lower flammability limits of C-H compounds at 25 °C and 1 atm; at moderate temperatures and in presence of diluent was the objective of this study. A set of 120 C-H compounds was divided into a correlation set and a prediction set of 60 compounds each. The absolute average relative error for the total set was 7.89%; for the correlation set, it was 6.09%; and for the prediction set it was 9.68%. However, it was shown that by considering different sources of experimental data the values were reduced to 6.5% for the prediction set and to 6.29% for the total set. The method showed consistency with Le Chatelier's law for binary mixtures of C-H compounds. When tested for a temperature range from 5 °C to 100 °C, the absolute average relative errors were 2.41% for methane; 4.78% for propane; 0.29% for iso-butane and 3.86% for propylene. When nitrogen was added, the absolute average relative errors were 2.48% for methane; 5.13% for propane; 0.11% for iso-butane and 0.15% for propylene. When carbon dioxide was added, the absolute relative errors were 1.80% for methane; 5.38% for propane; 0.86% for iso-butane and 1.06% for propylene.
authors.affiliation: São Paulo State University - UNESP, Campus of Guaratinguetá - FEG Av. Ariberto P. da Cunha, 333 - Guaratinguetá, SP, CEP 12510410, Brazil. Electronic address: andresmendiburu@yahoo.es.
authors.forename: Andrés Z
authors.initials: AZ
authors.lastname: Mendiburu
authors.affiliation: São Paulo State University - UNESP, Campus of Guaratinguetá - FEG Av. Ariberto P. da Cunha, 333 - Guaratinguetá, SP, CEP 12510410, Brazil.
authors.forename: João A
authors.initials: JA
authors.lastname: de Carvalho
authors.affiliation: Federal University of Itajubá-UNIFEI. Mechanical Engineering Institute, IEM Av BPS, 1303 - Itajubá, MG CEP 37500903, Brazil.
authors.forename: Christian R
authors.initials: CR
authors.lastname: Coronado
mesh_terms: D000388:Air; D000465:Algorithms; D001274:Atmospheric Pressure; D002245:Carbon Dioxide / Q000737:chemistry; D005390:Fires / Q000517:prevention & control*; D006838:Hydrocarbons / Q000737:chemistry*; D016571:Neural Networks, Computer; D009584:Nitrogen / Q000737:chemistry; D017751:Safety Management; D013696:Temperature
chemical_list: D006838:Hydrocarbons; D002245:Carbon Dioxide; D009584:Nitrogen
keywords: Diluent effect; Estimation; Lower flammability limits; Temperature dependence