泄压点火不同端管道内甲烷爆炸特性数值模拟

发布时间：2018-12-23 08:59

【摘要】：结合气体爆炸传播机理,利用FLACS软件对泄压点火不同端两种方式(泄压口通径为25 mm和泄压口完全开放)下甲烷的爆炸过程进行数值模拟,获得了5种体积分数甲烷的爆炸特性参数,分析得出:两种不同泄压方式下,10%,9.5%,11%体积分数的甲烷爆炸特性变化趋势接近,7%,8%的甲烷较前三者有所延迟;5种甲烷在管道中心处的最大爆炸压力、最大爆炸压力上升速率、最大爆炸压力下降速率、温度峰值都随甲烷体积分数的增大而逐渐上升,在10%时达到最大,继续增加甲烷体积分数则出现下降趋势,最大爆炸压力时间变化趋势与其相反;管道中心处的爆炸产物浓度随着甲烷体积分数的增大而增大,与泄压方式无关;增大管道泄压口面积有利于爆炸压力以及爆炸高温高压气体的释放,使得各体积分数甲烷的最大爆炸压力、最大爆炸压力上升速率、最大爆炸压力下降速率、温度峰值均下降,到达最大爆炸压力的时间均增大。
[Abstract]:Combined with the mechanism of gas explosion propagation, the explosion process of methane was simulated by using FLACS software in two different ways (the outlet diameter was 25 mm and the outlet was completely open). The explosion characteristic parameters of 5 kinds of volume fraction methane are obtained. The results show that under two different pressure relief methods, the change trend of methane explosion characteristic of 10% volume fraction of 9.5wt% volume fraction is close to that of 7%, 8% of methane was delayed compared with the former three. The maximum explosion pressure at the center of the pipeline, the maximum explosion pressure rise rate, the maximum explosion pressure drop rate, and the temperature peak value rise with the increase of the volume fraction of methane, and reach the maximum at 10. When the volume fraction of methane continues to increase, there is a downward trend, and the time variation trend of maximum explosion pressure is opposite to that of methane. The concentration of the explosive product in the center of the pipeline increases with the increase of methane volume fraction, which has nothing to do with the pressure relief mode. Increasing the pressure relief area of the pipeline is beneficial to the explosion pressure and the release of the explosion gas at high temperature and high pressure. The maximum explosion pressure, the maximum explosion pressure rise rate, the maximum explosion pressure drop rate and the temperature peak value of each volume fraction of methane are all decreased. The time to reach the maximum explosion pressure increases.
【作者单位】：西安科技大学安全科学与工程学院;西部矿井开采及灾害防治教育部重点实验室;西部煤矿安全教育部工程研究中心;
【基金】：国家自然科学基金(51674193) 陕西省科技攻关项目(2015SF280) 西安科技大学博士启动基金(2013QDJ048)
【分类号】：O643.22;X932

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