Characteristics of flame propagation during coal dust cloud explosion

Cao Wei-guo; Xu Sen; Liang Ji-yuan; Gao Wei; Pan Feng; Rao Guo-ning

doi:10.11883/1001-1455(2014)05-0586-08

Volume 34 Issue 5

Dec. 2014

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Cao Wei-guo, Xu Sen, Liang Ji-yuan, Gao Wei, Pan Feng, Rao Guo-ning. Characteristics of flame propagation during coal dust cloud explosion[J]. Explosion And Shock Waves, 2014, 34(5): 586-593. doi: 10.11883/1001-1455(2014)05-0586-08

Citation:

Cao Wei-guo, Xu Sen, Liang Ji-yuan, Gao Wei, Pan Feng, Rao Guo-ning. Characteristics of flame propagation during coal dust cloud explosion[J]. Explosion And Shock Waves, 2014, 34(5): 586-593. doi: 10.11883/1001-1455(2014)05-0586-08

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Characteristics of flame propagation during coal dust cloud explosion

doi: 10.11883/1001-1455(2014)05-0586-08

1.
School of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, Jiangsu, China
2.
National Quality Supervision and Inspection Center for Industrial Explosive Materials, Nanjing 210094, Jiangsu, China
3.
School of Engineering, The University of Tokyo, Tokyo 113-8656, Japan

Received Date: 2013-04-01
Rev Recd Date: 2013-06-29
Publish Date: 2014-09-25

Abstract

Abstract

Two kinds of different volatile pulverized coal were tested in a semi-enclosed vertical combustion tube.And a high-speed video camera and an infrared imager were used to record the flame propagation process and the spatial flame temperature distribution, respectively.The changes of the flame propagation velocity and temperature with time were analyzed for the two different coal dust clouds during combustion.Experimental results show that the flame propagation velocity and flame temperature of the high-volatile coal dust cloud are higher than those of the low-volatile coal dust cloud under the same experimental conditions.And the volumic mass of coal dust cloud as well as ignition energy can affect the flame propagation.With increasing the volumic mass of coal dust cloud, the flame propagation velocity and the flame temperature increase at first and then decrease, oscillating phenomena appear in the next process.With increasing the ignition energy, the flame propagation velocity and flame temperature increase.Based on the experimental data, an empirical formula was proposed for calculating the flame propagation velocity and flame temperature under certain conditions.
- mechanics of explosion,
- ignition energy,
- flame temperature,
- coal dust cloud mass fraction,
- dust explosion,
- flame propagation

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References(14)

References

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