A novel method for evaluation of fire prevention by using water curtain with large droplets

Zhong, Huiling; Chen, Guohua; Jiang, Saihua

doi:10.1016/j.jlp.2016.07.026

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…And they may cause gas and coal dust explosion. To prevent underground fires, direct fire extinguishing techniques such as the excavation of fire sources, water injection, grouting, inert gas injection, foam injection (including two-phase foam and three-phase foam), and gel injection are commonly used (Tian 2009;Shi et al 2017;Liang 2010;Lu et al 2018;Singh and Tripathi 1996;Zheng 2014;Walter 1981). However, if the fire in a goaf is out of control, the working face must be closed.…”

Section: Introductionmentioning

confidence: 99%

“…Very small, uniform droplets can be obtained using ultrasonic or electrostatic waves, but the diameters of such droplets can be as low as several nanometers, which is not suitable for fire prevention. Moreover, the mist production rate is low, and so these devices are generally only used for laboratory and medical purposes rather than in industry, especially in underground coal mines (Zhong et al 2016;Jones and Nolan 1995;Guo et al 2013;Fan 2011). There are several rotational methods.…”

Section: Introductionmentioning

confidence: 99%

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Novel technology for fire suppression using nitrogen-water mist in enclosed spaces

Shi

Ren

Liu

2019

Geomatics, Natural Hazards and Risk

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Water mists are an effective means of suppressing coal fires in enclosed spaces. In the present work, A new type of nitrogenwater mist atomizer was developed. This atomizing device does not need additional power facilities. Only relying on the interaction between nitrogen generated by nitrogen injection equipment in coal mine and water in underground pipelines, it can produce nitrogen with large flow rate, small droplet size, uniform particle size distribution and sufficient mixing, and water vapor liquid two-phase fluid. The structure and working principle of water atomization device were investigated. Numerical simulations and experimentation using the five-hole probe method were used to assess the velocity distributions generated by the atomization device when employing different starter twist numbers C L , and the optimal number was found. With the increase of C L , the gas rotating jet field in the expansion section tends to be more uniform and stable, and the backflow area of the rotating jet appears earlier. At the same time, the tangential velocity conducive to the liquid atomization process also increases significantly. A fire extinguishing experiment in an enclosed space demonstrated that the water mist produced a significant cooling effect and could reduce the combustion temperature effectively.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%