TY - JOUR
T1 - Transient reaction process and mechanism of cornstarch/air and CH4/cornstarch/air in a closed container
T2 - Quantitative research based on experiments and simulations
AU - Jing, Qi
AU - Wang, Dan
AU - Liu, Qingming
AU - Shen, Yang
AU - Wang, Zhisong
AU - Chen, Xu
AU - Zhong, Yingpeng
N1 - Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/5/5
Y1 - 2021/5/5
N2 - 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/m3, 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.
AB - 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/m3, 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.
KW - Dust explosion
KW - Explosion intensity parameters
KW - Flame propagation
KW - Three-components system
KW - Two-phase explosion
UR - http://www.scopus.com/inward/record.url?scp=85095946944&partnerID=8YFLogxK
U2 - 10.1016/j.jhazmat.2020.124475
DO - 10.1016/j.jhazmat.2020.124475
M3 - Article
C2 - 33187801
AN - SCOPUS:85095946944
SN - 0304-3894
VL - 409
JO - Journal of Hazardous Materials
JF - Journal of Hazardous Materials
M1 - 124475
ER -