海洋平台三相分离器天然气泄漏火灾热辐射影响

Influence of natural gas leakage fire thermal radiation on offshore platform three-phase separator

海洋平台三相分离器腐蚀泄漏后发生火灾会对周围人员和设备造成严重损害,研究其热辐射影响对安全生产和制定应对措施具有重要意义。以某海洋平台三相分离器为对象,基于PHAST软件建立了天然气泄漏喷射火模型,研究了泄漏孔径、三相分离器压力、海洋风速变化对天然气泄漏喷射火热辐射特性的影响。结果表明:在下风方向,热辐射先急剧升高至最高点后较快下降。随泄漏孔径增大,喷射火热辐射在侧风向、下风向和高度方向的影响范围均变大,泄漏孔径由20 mm升高至40 mm时变化最明显。随着分离器压力升高,热辐射下风向影响范围变大,高度方向几乎不变。随着风速的升高,热辐射下风向影响范围几乎不变,高度方向影响范围缩小。1%致死率影响范围随着泄漏孔径、压力的增大而增大,随着风速的增大而缩小。

The fire caused by the corrosion and leakage of the three-phase separator of the offshore platform will cause serious damage to the surrounding personnel and equipment.Studying the effect of thermal radiation is of great significance for safe production and formulating countermeasures.Taking the three-phase separator of an offshore platform as the object,a natural gas leakage jet fire model is established based on PHAST software,and the influence of the leakage aperture,the pressure of the three-phase separator,and the ocean wind speed on the thermal radiation characteristics of the natural gas leakage jet is studied.The results show that in the downwind direction,the thermal radiation first rises sharply to the highest point and then decreases quickly.With the increase of the leakage aperture,the influence range of jet fire thermal radiation in the crosswind direction,downwind direction and height direction becomes larger,and the change is the most obvious when the leakage aperture increases from 20 mm to 40 mm.As the pressure of the separator increases,the influence range of the wind direction under the thermal radiation becomes larger,and the height direction is almost unchanged.As the wind speed increases,the influence range of the wind direction under the thermal radiation is almost unchanged,and the influence range of the height direction decreases.The range of 1%lethality increases with the increase of leakage aperture and pressure,and decreases with the increase of wind speed.