摘要
为减少低浓度瓦斯输送过程中输送管道爆炸事故,利用公称直径分别为700、500、200 mm的钢制爆炸实验管道,实验研究了管道中瓦斯爆炸压力及火焰波的传播规律。结果表明:爆炸传播过程中最大爆炸压力随长径比变化曲线呈波动上升趋势,管径变化会改变压力峰值出现的时间空间位置,700、500、200 mm管道最大爆炸压力分别出现在长径比115、103、103处,分别为0.59、0.28、0.09 MPa。管道直径越大,最大爆炸压力越大。火焰传播速度随长径比变化曲线起伏波动,整体呈上升趋势,通过分析可将火焰传播过程分为自由传播、反弹加速、稳定加速3个阶段,700、500、200 mm管道最大火焰传播速度分别出现在长径比83、108、96处,分别为846、943、250 m/s。实验中700、500 mm管道出现爆燃转爆轰现象,火焰速度可达800 m/s以上,管径越大爆燃转爆轰过程越早。研究结果可为工程实践中瓦斯管道输送和利用的安全防护提供有力支撑。
To effectively control the explosion accidents in low-concentration gas transmission pipelines,experimental research was conducted using steel explosion test pipelines with nominal diameters of 700 mm,500 mm,and 200 mm.The study investigated the propagation characteristics of gas explosion pressure and flame front in the pipelines.The results showed that the maximum explosion pressure during the propagation process exhibited a fluctuating upward trend with changes in the length-to-diameter ratio.The variation in pipe diameter only affected the temporal and spatial position of the pressure peak.The maximum explosion pressures for the 700 mm,500 mm,and 200 mm pipelines occurred at length-to-diameter ratios of 115,103,and 103,corresponding to 0.59 MPa,0.28 MPa,and 0.09 MPa,respectively.Larger pipe diameters resulted in higher maximum explosion pressures.The flame propagation velocity exhibited a fluctuating trend with changes in the length-to-diameter ratio,overall showing an increasing trend.The flame propagation process could be divided into three stages:free propagation,rebound acceleration,and stable acceleration.The maximum flame propagation velocities for the 700 mm,500 mm,and 200 mm pipelines occurred at length-to-diameter ratios of 83,108,and 96,corresponding to 846 m/s,943 m/s,and 250 m/s,respectively.During the experiments,deflagration-to-detonation transition phenomena occurred in the 700 mm and 500 mm pipelines,with flame speeds exceeding 800 m/s.Larger pipe diameters led to earlier deflagration-to-detonation transition processes.The research findings provide strong support for the safety protection of gas pipeline transportation and utilization in engineering practice.
作者
杨堃
司荣军
黄子超
贾泉升
赵井清
牛宜辉
YANG Kun;SI Rong-jun;HUANG Zi-chao;JIA Quan-sheng;ZHAO Jing-qing;NIU Yi-hui(China Coal Research Institute,Beijing 100013,China;State Key Laboratory of Coal Mine Disaster Dynamics and Control,Chongqing 400037,China;Fire and Explosion Pretention Research Brands,China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400039,China)
出处
《工程爆破》
CSCD
北大核心
2024年第4期17-25,共9页
Engineering Blasting
基金
国家自然科学基金资助项目(52104238,52174227)
重庆市自然科学基金资助项目(CSTB2022NSCQ-MSX0867)
重庆英才计划技术创新与应用发展资助项目(cstc2021ycjh-bgzxm0230)
重庆市博士“直通车”基金资助项目(CSTB2023NSCQ-BSX0018)。
关键词
瓦斯爆炸
不同管径
爆炸压力
火焰传播速度
gas explosion
different pipe diameters
explosion pressure
flame propagation speed
