Open AccessIgnition and propagation properties of coal dust – air – methane hybrid mixtures
Author(s) -
Maria Prodan,
Emilian Ghicioi,
Adrian Jurca,
Dumitru Oancea
Publication year - 2021
Publication title -
revue roumaine de chimie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.135
H-Index - 21
ISSN - 0035-3930
DOI - 10.33224/rrch.2021.66.1.02
Subject(s) - flammable liquid , methane , coal dust , ignition system , minimum ignition energy , atmospheric pressure , dust explosion , flammability limit , bar (unit) , coal , chemistry , thermodynamics , materials science , environmental science , meteorology , organic chemistry , physics
The presence of a flammable gas in a combustible dust cloud significantly modifies its explosivity parameters. Thus, a hybrid mixture can become flammable even when both the dust-air and gas-air binary mixtures are under the corresponding lower explosion limits. The pressure-time histories of hybrid mixtures formed by coal dust, methane and air at different concentrations, at 1 bar initial pressure and normal temperature, were studied using the standard 20 L spherical explosion vessel and 5kJ chemical igniters or 10 J permanent sparks. From the early stages of the pressure-time history, when the pressure increase is equal to or less than the initial pressure, the normal burning velocities were evaluated and discussed.