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Gas Turbines: Coal, Biomass, and Alternative Fuels

Experimental Study on Characteristics of Methane–Coal-Dust Mixture Explosion and Its Mitigation by Ultra-Fine Water Mist

[+] Author and Article Information
Hongli Xu, Rui Gu

State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, People’s Republic of China

Xishi Wang1

State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, People’s Republic of China

Heping Zhang

State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei 230026, People’s Republic of Chinawxs@ustc.edu.cn

1

Corresponding author.

J. Eng. Gas Turbines Power 134(6), 061401 (Apr 12, 2012) (6 pages) doi:10.1115/1.4005816 History: Received March 24, 2011; Revised May 28, 2011; Published April 09, 2012; Online April 12, 2012

This paper presents the results of an experimental investigation on the characteristics of methane–coal-dust mixture explosion and its mitigation by ultra-fine water mist. Four E12-1-K-type fast response thermocouples, two printed circuit board (PCB) piezotronic pressure transducers were used to obtain the temperature and pressure history, while a GigaView high-speed camera was used to visualize the processes. Different methane concentrations, coal-dust concentrations, diameters of coal particles, and volumes of ultra-fine water mist were considered to investigate their effects on methane–coal-dust mixture explosion. The temperature of explosion flame, the maximum explosion overpressure, the maximum rate of overpressure rise, and the critical volume flux of ultra-fine water mist were experimentally determined. The results show that the characteristics of the methane–coal-dust mixture explosion and the mitigating effectiveness by ultra-fine water mist are influenced by the methane concentration, the coal-dust concentration, the coal-dust diameter and the applied volume flux of ultra-fine water mist. For example, both the maximum explosion overpressure and rate of overpressure rise increased with increasing of coal-dust concentrations and methane concentrations. All of the test cases indicate that ultra-fine water mist can mitigate the mixture explosion and suppress the flame propagation efficiently from the images recorded by the high-speed video camera.

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Copyright © 2012 by American Society of Mechanical Engineers
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Figures

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Figure 6

Maximum overpressure of the mixture explosion with different coal-dust concentration

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Figure 7

Maximum explosion overpressure of the mixture explosion with different methane concentrations

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Figure 8

Maximum rate of overpressure rise of the mixture explosion with different coal-dust concentrations

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Figure 9

Maximum rate of overpressure rise of the mixture explosion with different methane concentrations

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Figure 10

Maximum overpressure of the mixture explosion mitigated with different volume flux of ultra-fine water mist

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Figure 11

Maximum rate of overpressure rise of the mixture explosion mitigated with different volume flux of ultra-fine water mist

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Figure 12

Sequence of video images of methane–coal-dust mixture explosion mitigated by ultra-fine water mist

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Figure 5

Overpressure history of methane–coal-dust mixture explosion

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Figure 4

Maximum explosion temperature of the mixture explosion with different methane concentrations

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Figure 3

Maximum explosion temperature of the mixture explosion with different coal-dust concentrations

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Figure 2

Temperature history of methane–coal-dust mixture explosion

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Figure 1

Experimental apparatus of methane–coal-dust mixture explosion and its mitigation by ultra-fine water mist

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