Gas explosion characteristics and its control technologies in closed fire zone
Zhenzhen Jia1,2, Feng Tao1,2
COMPUTER MODELLING & NEW TECHNOLOGIES 2014 18(3) 21-25
1 School of Resources and Safety Engineering Central South University, Changsha City, Hunan Province, China, 410083
2 School of Energy and Safety Engineering Hunan University of Science and Technology, Xiangtan City, Hunan Province, China, 411201
The closure measures of fire zones are taken after gas explosion in the working face, which can bring two problems: whether closure measures will lead to a secondary gas explosion in closed fire zones or not, and what will be the rough time interval between taking measures and gas explosion occurrence. To solve these problems, gas accumulation characteristics, oxygen concentration characteristics and fire sources in the fire closure process were analysed, and then the characteristics and rules of gas explosion were acquired, in addition, the pressure change and gas accumulation model in closure zones under three conditions (the temporary closure wall only in air inlet laneway, only in air return laneway, or both in air inlet laneway and air return laneway) were obtained. Finally, the measures and technologies to prevent and control gas explosion were introduced in the fire closure process of working face.