Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion

ZHANG Yansong; LI Nan; GUO Rui; ZHANG Xinyan; ZHANG Gongyan; HUANG Xingwang

doi:10.11883/bzycj-2021-0470

Volume 42 Issue 7

Jul. 2022

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ZHANG Yansong, LI Nan, GUO Rui, ZHANG Xinyan, ZHANG Gongyan, HUANG Xingwang. Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion[J]. Explosion And Shock Waves, 2022, 42(7): 075402. doi: 10.11883/bzycj-2021-0470

Citation:

ZHANG Yansong, LI Nan, GUO Rui, ZHANG Xinyan, ZHANG Gongyan, HUANG Xingwang. Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion[J]. Explosion And Shock Waves, 2022, 42(7): 075402. doi: 10.11883/bzycj-2021-0470

Citation:

ZHANG Yansong, LI Nan, GUO Rui, ZHANG Xinyan, ZHANG Gongyan, HUANG Xingwang. Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion[J]. Explosion And Shock Waves, 2022, 42(7): 075402. doi: 10.11883/bzycj-2021-0470

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Relationship between pyrolysis kinetics and flame propagation characteristics of lauric acid and stearic acid dust explosion

doi: 10.11883/bzycj-2021-0470

1.
Institute of Safety and Environmental Engineering, Shandong University of Science and Technology, Qingdao 266590, Shandong, China
2.
State Key Laboratory of Mining Disaster Prevention and Control Co-founded by Shandong Province and the Ministry of the Science and Technology, Shandong University of Science and Technology, Qingdao 266590, Shandong, China

Received Date: 2021-11-10
Rev Recd Date: 2021-12-23

Available Online: 2022-06-09

Publish Date: 2022-07-25

Abstract

Abstract

The pyrolysis and oxidation characteristics and flame propagation characteristics in the semi-enclosed vertical pipe of lauric acid dust and stearic acid dust were studied by using the synchrotron thermal analyzer, improved Hartmann explosive test device and high-speed photography system, the pyrolysis kinetics was analyzed by Coats-Redfern method to obtain the kinetic parameters, and the influence of pyrolysis and oxidation characteristics on the law of flame propagation during the explosion and combustion of lauric acid and stearic acid dust was analyzed and discussed. The results show that, when the dust cloud concentration is 125 g/m³, the flame front structure of lauric acid dust cloud is smoother than stearic acid dust, but the flame propagation speed of stearic acid dust is significantly greater than that of lauric acid dust; with the increase of dust cloud concentration, the flame front structure of lauric acid dust and stearic acid dust gradually becomes discrete, and the flame propagation speed gradually increases, but the speed difference gradually decreases. The average flame propagation speed of lauric acid dust is higher than that of stearic acid dust at a dust cloud concentration of 750 g/m³, and the flame structure continuity is significantly reduced. The difference in flame propagation between lauric acid dust and stearic acid dust at low concentrations is mainly determined by the oxidation exothermic characteristics of the fast pyrolysis stage. The larger the pre-exponential factor, the more active sites involved in the pyrolysis and oxidation reactions, the larger the oxidation exothermic heat, the faster the exothermic rate, the faster the flame propagation speed, and the faster the flame frontal structure transition from smooth continuous to discrete complex. And with the increase of dust cloud concentration, the flame propagation difference is gradually controlled by the activation energy and the mass transport process of oxygen in the preheating zone of the flame front. The greater the activation energy, the greater the oxygen consumption, the faster the oxygen consumption rate, the easier it will lead to the decrease of flame propagation speed, the more complex the flame front, and the decrease of flame structure continuity.
- dust explosion,
- lauric acid,
- stearic acid,
- pyrolysis kinetics,
- flame propagation

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