Explosion characteristics of oil shale dust in a confined space

WU Linyuan; YU Lifu; WANG Tianshu; SUN Wei; XU Jianhang; LI Hang

doi:10.11883/bzycj-2021-0139

Volume 42 Issue 1

Jan. 2022

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Article Navigation > Explosion And Shock Waves > 2022 > 42(1): 015401

WU Linyuan, YU Lifu, WANG Tianshu, SUN Wei, XU Jianhang, LI Hang. Explosion characteristics of oil shale dust in a confined space[J]. Explosion And Shock Waves, 2022, 42(1): 015401. doi: 10.11883/bzycj-2021-0139

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WU Linyuan, YU Lifu, WANG Tianshu, SUN Wei, XU Jianhang, LI Hang. Explosion characteristics of oil shale dust in a confined space[J]. Explosion And Shock Waves, 2022, 42(1): 015401. doi: 10.11883/bzycj-2021-0139

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Explosion characteristics of oil shale dust in a confined space

doi: 10.11883/bzycj-2021-0139

1.
College of Environmental and Safety Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China
2.
College of Chemical Engineering, Shenyang University of Chemical Technology, Shenyang 110142, Liaoning, China

Received Date: 2021-04-22
Rev Recd Date: 2021-08-19

Available Online: 2021-12-01

Publish Date: 2022-01-20

Abstract

Abstract

To investigate the explosion characteristics of oil shale dust, four kinds of oil shale dust from main mining areas such as Longkou (LK), Maoming (MM), Huadian (HD) and Fushan (FS) in China were chosen as experimental samples. A 20-litre explosion sphere vessel was used as the experimental device to carry out explosion experiments to systematically explore the influences of the parameters of the samples, including dust mass concentration, particle size, the content of volatile and ash, and oxygen content on the explosion characteristics of oil shale dust. The experimental results show that the higher the volatile content of the oil shale, the higher the maximum explosion pressure, the maximum rise rate of explosion pressure (dp/dt)_max, and the lower the minimum explosion mass concentration; the volatile has a significant promoting effect on the explosion of the oil shale dust, while the ash has a significant inhibiting effect on it. In the dust particle size range from 37.52 microns to 106.43 microns, the magnitudes of p_max and (dp/dt)_max of the four oil shale samples all decrease with the increase of particle size, and the time to reach p_max decreases gradually as the particle size becomes smaller. The smaller the particles are, the faster the volatiles are released, which can improve the reaction degree of the explosion. In the dust mass concentration range from 400 g/m³ to 2 500 g/m³, the magnitudes of p_max and (dp/dt)_max of the four samples all took on a trend of increasing first and then decreasing with the increase of dust mass concentration. After the critical pressure concentration (1000 g/m³) was exceeded, the explosion intensity decreased slightly, but still maintained at a high level, and still had relatively strong destructive power. The magnitudes of p_max (0.61 MPa) and (dp/dt)_max (29.32 MPa/s) of the LK sample are the highest in the four samples, which are at the same level as that of lignite with similar volatile content. The minimum explosion concentration (200 g/m³) of the LK sample is the lowest among the four samples, which is higher than that of the lignite with the similar volatile content. By using N₂ as the inert gas, the oxidation, the heat released and the magnitudes of p_max and (dp/dt)_max of the LK sample all decreased with the decrease of oxygen content. When the oxygen content was reduced to 15%, there were no more explosions in the system, and the limiting oxygen concentration was found to be 16%.
- oil shale dust,
- dust explosion,
- minimum explosion concentration,
- maximum explosion pressure,
- maximum rate of explosion pressure rise,
- limiting oxygen concentration

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References

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