摘要
针对天津市主干道路既有天然气管道可能发生的泄漏扩散并诱发爆炸的风险,结合该城市气候特征,基于FLACS研究了天然气管道在泄漏点的泄漏扩散特征以及爆炸冲击波对附近建筑物的影响。结果表明:风速对主干道路下天然气管道泄漏扩散的影响非常明显,风速越大,处于爆炸范围的天然气云团越小,对抢险救援更有利,但应充分考虑救援过程中风速和风向可能出现的变化,同时在关闭阀门、疏散下风向人群时,严格控制泄漏点周边5 m、距地面高度24 m范围内的危险行为;主干道路下天然气管道泄漏扩散对周围影响很大,该城市最大风速下天然气的水平扩散距离可达25 m,应对该区域进行及时疏散。主干道路天然气管道泄漏爆炸超压荷载随距地面高度的增加而减小,最大超压超过1.5 kPa,超压荷载峰值主要集中在距地面4~22 m范围内,应注意抗爆防护。
For the possible leakage and diffusion of existing natu⁃ral gas pipelines under Tianjin urban main road and the risk of in⁃ducing explosion,combined with the climatic characteristics of the city,the leakage and diffusion characteristics of natural gas pipelines at the leakage point and the impact of explosion shock waves on nearby buildings were studied based on FLACS.The results show that the influence of wind speed on the leakage and diffusion of natural gas pipeline under the main road is obvious.The larger the wind speed is,the smaller the natural gas cloud in the explosion range is,which is more favorable for emergency res⁃cue.However,the possible changes of wind speed and wind direc⁃tion during the rescue process should be fully considered,when closing the natural gas valve and evacuating people in the down⁃wind direction,the dangerous behavior within 5 m around the leakage point and 24 m from the ground height should be strictly controlled.The leakage and diffusion of natural gas pipeline under the main road has a great impact on the surrounding area.The horizontal diffusion distance of natural gas under the maximum wind speed of the city can reach 25 m.The area should be evacu⁃ated in time.The explosion overpressure of natural gas pipeline leakage under the main road decreases with the increase of the height above the ground.The maximum overpressure exceeds 1.5 kPa,the peak value of overpressure load is mainly concentrated within the range of 4~22 m above the ground so the anti⁃explo⁃sion protection should be considered.
作者
赵伟
张海
李丹
王岱
Zhao Wei;Zhang Hai;Li Dan;Wang Dai(Tenth Design&Research Branch,North China Munici-pal Engineering Design&Research Institute Co.,Ltd.,Tianjin 300074,China;School of Civil Engineering,Joint Research Centre for Protective Infrastructure Technology and Environmen-tal Green Bioprocess,Tianjin Chengjian University,Tianjin 300384,China;Fourth Design&Research Branch,North China Municipal Engineering Design&Research Institute Co.,Ltd.,Tianjin 300074,China;Tianjin Key Laboratory of Civil Structure Protection and Reinforcement,Tianjin 300384,China)
出处
《消防科学与技术》
CAS
北大核心
2023年第10期1339-1343,共5页
Fire Science and Technology
基金
国家重点研发计划(2017YFC0805000)。
