摘要
若天然气管道泄漏,与外部火源接触可能导致形成喷射火,对附近的工作人员和设备带来巨大风险.因此,深入研究天然气管道中喷射火焰的燃烧行为显得尤为关键.选取尺寸分别为 0.5、1.0、1.5、2.0、2.5、3.0 mm的 6 种孔径,压力分别为0.5、0.8、1.0、1.2、1.5 MPa,进行不同工况下的天然气管道喷射火试验.结果表明:当天然气燃烧达到稳定时,随着喷射压力和喷嘴口径的增大,火焰高度和热辐射逐渐升高;在孔径为3.0 mm时,火焰最长达到4.32 m,泄漏孔水平位置1.0 m处热辐射最大达到552 W/m2;当孔径在1.5 mm、压力为1.2 MPa时,火焰开始出现抬升现象,随着压力和孔径的增大,抬升现象更加明显.当泄漏孔径在3.0 mm、压力为1.5 MPa时,最大抬升到0.4 m.试验结果为处置天然气管道泄漏喷射火提供了数据依据.
Abstract
When a gas pipeline leaks and comes into contact with an external fire source,it may lead to the formation of jet fire,which poses a huge risk to nearby workers and equipment.There-fore,it is particularly crucial to conduct in-depth research on the combustion behavior of jet flames in gas pipelines.Six types of pore sizes were selected,including 0.5,1.0,1.5,2.0,2.5,3.0 mm,with pressures of 0.5,0.8,1.0,1.2,1.5 MPa,respec-tively,to conduct jet fire experiments on gas pipelines under dif-ferent operating conditions.The results show that when natural gas combustion reaches stability,the flame height and thermal ra-diation gradually increase with the increase of injection pressure and nozzle diameter;At a 3 mm aperture,the flame reaches a maximum length of 4.32 m,and the maximum thermal radiation reaches 552 W/m2 at a horizontal position of 1m from the leakage hole;When the aperture is 1.5 mm and the pressure is 1.2 MPa,the flame begins to rise.As the pressure and aperture increase,the rise phenomenon becomes more pronounced.When the leak-age aperture is 3 mm and the pressure is 1.5 MPa,the maximum lift is 0.4 m.The experimental values provide guidance for dealing with the situation of jet fire caused by natural gas pipeline leakage.
NETL
NSTL
维普
万方数据