摘要
为评估并行天然气管道事故中防爆墙的减灾作用,基于FLACS(气体爆炸模拟系统)-CFD(计算流体力学)构建并行双管与防爆墙组合的三维场景,在无风条件下,设置泄漏孔径0.1 m、泄漏率40 kg/s,并比较两种墙型与3、4、5 m墙高对泄漏扩散、蒸气云爆炸超压与火焰温度的影响。结果表明,设置防爆墙后关键监测点的峰值超压约为0.002~0.039 bar,较无遮挡情形明显降低;峰值火焰温度约为0.94×10^(3)~2.22×10^(3)K,墙高增加总体促使温度与超压进一步回落,并有利于将火焰约束在墙外侧,而对泄漏云团体量与峰值体积分数的影响较小。综合减灾效益与工程可实施性,建议在上述工况下优选约4 m的墙高,以在保证抑爆与隔热效果的同时控制建设成本。
To evaluate the mitigation effect of explosion-proof walls during accidents involving parallel natural-gas pipelines,the paper builds a 3-D FLACS-CFD model of twin pipelines with walls under a no-wind condition,sets a leak orifice of 0.1 m and a leak rate of 40 kg/s,compares two wall layouts at heights of 3/4/5 m for their influence on dispersion,vapor-cloud explosion overpressure,and flame temperature.Results show that adding walls reduces peak overpressure at key probes to about 0.002~0.039 bar relative to the no-barrier case,peak flame temperatures are approximately 0.94×10^(3)~2.22×10^(3) K,and greater wall height generally further lowers both temperature and overpressure while helping confine the flame to the outer side of the wall.The effects on overall cloud volume and peak fuel volume fraction are limited.Balancing mitigation benefits and constructability,it recommends a wall height of about 4 m for the tested conditions to achieve effective shock/flame attenuation an d thermal shielding at reasonable costs.
作者
孙正才
熊华勇
李森
肖国清
SUN Zhengcai;XIONG Huayong;LI Sen;XIAO Guoqing(Hubei Jianghanliangji Petrochemical Engineering Group Co.,Ltd.,Chengdu Branch,Chengdu 610500,China;National Pipe Network Group Southwest Pipeline Co.,Ltd.,Guiyang Branch,Guiyang 550081,China;College of Chemistry and Chemical Engineering,Southwest Petroleum University,Chengdu 610500,China;Sichuan Key Laboratory of Oil and Gas Fire Protection,Chengdu 611731,China)
出处
《油气与新能源》
2025年第6期57-68,共12页
Petroleum and new energy
基金
国家自然科学基金项目“基于物联网和事故模型的油气燃爆重大事故救援决策技术研究”(52174209)。
关键词
天然气管道
防爆墙
泄漏扩散
燃爆危害
数值模拟
Natural gas pipeline
Explosion-proof wall
Gas leakage diffusio n
Explosion hazard
Simulation
