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The Characteristics of Methane Combustion Suppression by Water Mist and Its Engineering Applications

by Rongkun Pan 1,2,3,*, Zejun Xiao 1 and Minggao Yu 1,4
1
Department of Safety & Science Engineering, Henan Polytechnic University, Jiaozuo 454003, China
2
The Collaborative Innovation Center of Coal Safety Production of Henan Province, Henan Polytechnic University, Jiaozuo 454003, China
3
Henan Key Laboratory of Prevention and Cure of Mine Methane & Fires, Jiaozuo 45403, China
4
State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
*
Author to whom correspondence should be addressed.
Energies 2017, 10(10), 1566; https://doi.org/10.3390/en10101566
Received: 7 September 2017 / Revised: 22 September 2017 / Accepted: 9 October 2017 / Published: 11 October 2017
To safely mine coal, engineers must prevent gas combustion and explosions, as well as seek feasible and reasonable techniques to control for these types of incidents. This paper analyzes the causes and characteristics of methane combustion and explosions. Water mist is proposed to prevent and control methane combustion in an underground confined space. We constructed an experiment platform to investigate the suppression of methane combustion using water mist for different conditions. The experimental results showed that water mist is highly effective for methane flame inhibition. The flame was extinguished with water mist endothermic cooling. However, the annular regions of water vapor around the fire played a vital role in flame extinction. Water from the evaporating mist replaces the oxygen available to the fuel. Additionally, the time required for fuel ignition is prolonged. For these reasons, the water particle action to flame surface is reinforced and the fuel’s reaction with air is delayed. As a result, flame stretching and disturbances occur, which serve to extinguish the flame. Engineering application tests were carried out in the goaf, drill hole and upper-corner to investigate the prevention and control of methane gas combustion, with the results showing a good application effect. View Full-Text
Keywords: methane gas combustion; water mist; prevent and control; flame stretch; gas disaster methane gas combustion; water mist; prevent and control; flame stretch; gas disaster
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Pan, R.; Xiao, Z.; Yu, M. The Characteristics of Methane Combustion Suppression by Water Mist and Its Engineering Applications. Energies 2017, 10, 1566.

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