Effect of variation in gas distribution on explosion propagation characteristics in coal mines  

作　　者：ZHU Chuanjie 

机构地区：[1]State Key Laboratory of Coal Resources and Safe Mining, China University of Mining & Technology, Xuzhou 221008, China [2]School of Safety Engineering, China University of Mining & Technology, Xuzhou 221116, China

出　　处：《Mining Science and Technology》2010年第4期516-519,共4页矿业科学技术（英文版）

基　　金：provided by the National Natural Science Foundation of China (No.50574093);the Key Program of the National Nature Science of China (No.50534090);the National Basic Research and Development Program of China (No.2005CB221506);the National Science Foundation for Young Scholars of China (No.50804048);the National Key Technology Research and Development Program (Nos.2006BAK03B04 and 2007 BAK29B01)

摘　　要：In order to investigate the effect of variation in the distribution of gas on explosion propagation characteristics in coal mines, experiments were carried out in two different channels with variation in gas concentration and geometry. Flame and pressure transducers were used to track the explosion front velocity. The flame speed (Sf) showed a slight downward trend while the methane concentration varied from 10% to 3% in the experimental channel. The peak overpressure (Pmax) dropped dramatically when compared with normal conditions. As well, the values of Pmax and Sf decreased when the methane concentration dropped from 8% to 6%. The flame speed in the channel, connected to a cylinder with a length varying from 0.5 to 2 m, was greater than that in the normal channel. The peak overpressure was also higher than that under normal conditions because of a higher flame speed and stronger pressure piling up. The values of Pmax and Sf increased with an increase in cylinder length. The research results indicate that damage caused by explosions can be reduced by decreasing the gas concentration, which should be immediately detected in roadways with large cross-sections because of the possibility of greater destruction caused by more serious explosions.In order to investigate the effect of variation in the distribution of gas on explosion propagation characteristics in coal mines, experiments were carried out in two different channels with variation in gas concentration and geometry. Flame and pressure transducers were used to track the explosion front velocity. The flame speed （Sf） showed a slight downward trend while the methane concentration varied from 10% to 3% in the experimental channel. The peak overpressure （Pmax） dropped dramatically when compared with normal conditions. As well, the values of Pmax and Sfdecreased when the methane concentration dropped from 8% to 6% The flame speed in the channel, connected to a cylinder with a length varying from 0.5 to 2 m, was greater than that in the normal channel. The peak overpressure was also higher than that under normal conditions because of a higher flame speed and stronger pressure piling up. The values of Pmax and Sf increased with an increase in cylinder length. The research results indicate that damage caused by explosions can be reduced by decreasing the gas concentration, which should be immediately detected in roadways with large cross-sections because of the possibility of greater destruction caused by more serious explosions.

关 键 词：variation in gas concentration geometric variation flame speed peak overpressure explosion propagation 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] X928.7[自动化与计算机技术—控制科学与工程]