Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 409, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jhazmat.2020.124475
Keywords
Dust explosion; Two-phase explosion; Three-components system; Explosion intensity parameters; Flame propagation
Categories
Funding
- National Key Research and Development Program of China [2017YFC0804705]
- National Natural Science Foundation of China [11572044]
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The study shows that the explosion intensity parameters vary significantly under different conditions, with CH4/air explosion exhibiting higher intensity than cornstarch/air explosion. Adding methane can enhance the explosive intensity of cornstarch, but this effect decreases after a certain concentration is reached.
Both dust/air explosion and flammable gas/dust/air explosion are common forms of energy release. Experiments and simulation models with a multi-step chemical reaction mechanism were used to study the intensity parameters and mechanism of the CH4/air explosion, cornstarch/air explosion and CH4/cornstarch/air explosion in a closed container. Results showed that the peak overpressure, maximum flame temperature, and average flame propagation speed of the stoichiometric CH4/air explosion reach 0.84 MPa, 2614 K and 3.5 m/s, respectively. The optimal concentration of cornstarch explosion is 750 g/m(3), and its peak overpressure, maximum flame temperature and average flame propagation speed are 0.76 MPa, 2098 K and 1.77 m/s, respectively. For a three-components system, adding methane can significantly increase the explosive intensity and combustion performance of cornstarch. The explosive intensity parameters (peak overpressure, maximum flame temperature, average flame propagation speed) of a certain concentration of cornstarch first increase and then decrease with the increase of methane concentration. The maximum explosion intensity parameters of a three-components system with a certain concentration of lean-methane/air are higher than that of single-phase, but always lower than that of the stoichiometric methane/air. Moreover, the mutual coordination of dust and combustible gas in energy release and the mutual competition mechanism in oxygen consumption are described.
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