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天然气集气站火灾事故对集气站安全生产构成严重威胁,研究集气站内关键设备泄漏引发的火灾特性具有重要意义。基于大涡模拟(Large Eddy Simulation)数值方法,针对分离器内介质成分、相态等参数特殊性,采用火灾动力学模拟软件FDS建立集气站卧式气液分离器喷射火模型,对分离器典型泄漏孔径下的喷射火进行数值仿真,研究其火焰几何特性、火场温度及热辐射特性。结果表明,随分离器泄漏孔径的增大,喷射火火焰长度及火焰最大宽度也相应增大。大、小两泄漏孔径的喷射火在充分燃烧区域火焰最高温度分别为1525℃和1065℃。大孔径泄漏的喷射火热辐射值明显高于小孔径,并由于湍流浓度脉动的作用导致热辐射值波动较大,喷射火火焰轴向对称面与相距1.5 m的侧平面上测点热辐射峰值之比与泄漏孔径成正比。根据模拟结果,定量分析了两泄漏孔径下喷射火的危险距离,并提出相应的事故控制措施。
The gas gathering station fire accident poses a serious threat to the safety of the gas gathering station. It is of great significance to study the fire characteristics caused by the leakage of key equipment in the gas gathering station. Based on the large eddy simulation numerical method, aiming at the particularity of the medium composition, phase state and other parameters in the separator, fire fire simulation model FDS was used to establish the jet fire model of horizontal gas-liquid separator in gas gathering station. The numerical simulation of jet fire under typical leakage aperture is carried out to study its flame geometry, fire temperature and thermal radiation characteristics. The results show that with the increase of separator leakage aperture, the length of the flame and the maximum width of the flame also increase accordingly. Large and small two leakage aperture jet fire in the full combustion zone flame temperature were 1525 ℃ and 1065 ℃. The fiery radiation value of large aperture leakage is obviously higher than that of small aperture, and the fluctuation of thermal radiation value is large due to the pulsation of turbulent concentration. The axial symmetry plane of jet flame and the measuring point heat radiation peak on the side plane 1.5 m away from each other Proportional to leakage aperture. According to the simulation results, the dangerous distance of the fire from the two leaky holes is quantitatively analyzed and the corresponding accident control measures are put forward.