煤矿井下瓦斯爆炸后爆源临近区域特殊热环境分析研究

Special thermal environment of adjacent explosions center areas after methane explosions

为了研究瓦斯爆炸诱发次生灾害的致灾热因素,对煤矿瓦斯爆炸特殊热环境进行了分析。将瓦斯爆炸后的特殊热环境分为爆炸产生的高温高压的火焰波、较高温常压的爆源邻近区域的动态热环境两部分。通过对瓦斯爆炸火焰波的特征的理论分析和相关专家学者开展的瓦斯爆炸实验所测得火焰波特征数据,对爆炸火焰波的温度、速度等参数进行了分析。通过数学模型的建立,结合瓦斯爆炸后瞬间爆源所在巷道空气温度随距离的分布规律及数值模拟技术对爆炸后爆源临近区域的较高温、常压的动态热环境进行了研究。得出,瓦斯爆炸大多数是弱爆燃状态。爆炸后爆源临近区域空气温度随传播距离的增加逐渐降低,高温区域逐渐向远离爆源的方向运移,高温的持续时间越来越短。

The special thermal environment was analyzed to study the thermal factor that induced the sub-accident after methane explosions.The special environment was divided into two parts,the high temperature and high pressure fire flame,and the relatively high temperature and normal pressure environment of adjacent explosions center areas after methane explosions.The temperature and velocity of flame were discussed based on some theory study and some experiments which were done by some experts.The relatively high temperature and normal pressure environment of adjacent explosions center areas after methane explosions was studied based on some mathematical model,the temperature distribution of air after explosions,and numerical simulation technology.The results are as follows：most of the mine methane explosions are weak deflagration;the temperature of adjacent explosions center areas decreases along with the distance from explosion center,high temperature area moves far away from explosion center and the holding time becoming shorter and shorter.