盐岩地下储气库泄漏的喷射火事故后果定量分析

CONSEQUENCE QUANTITATIVE ANALYSIS OF JET FIRE CAUSED BY GAS LEAKAGE FROM UNDERGROUND GAS STORAGES IN SALT ROCK

为提高盐岩储气库营运的安全性,建立燃气从注采井套管破裂时的稳态泄漏率模型,提出将热辐射模型与伤害概率方程相结合的方法,对盐岩地下储库气体泄漏后可能发生的喷射火的热辐射后果进行研究,并与事故调查数据进行对比验证。研究结果表明,提出的喷射火热辐射危险距离的计算值与已发生的天然气输送管道喷射火事故现场观察的燃烧面积基本一致,计算值与实际观察值的误差都在20%以内。采用该方法对影响盐岩储气库喷射火事故后果的主要因素进行分析,得出喷射火的伤害半径随着注采井管径和运营压力(埋深)的增大而增大。提出的方法可为盐岩地下储库气体泄漏后的喷射火热辐射后果定量评价提供参考。

To improve working security of underground gas storages in salt rock, a model for calculating the gas leakage rate at steady state was established; and a method for consequence analysis of thermal radiation from jet fire was presented based on probability equation and consequence evaluation model. The hazard distance estimated by the proposed method was then compared with the area of bum in the observation of the actual accidents. It is found that the estimated hazard distance agrees well with the observed value; and the maximum deviation by the proposed method is less than 20%. Furthermore, the main factors that influence the hazard range associated with jet fire accident from underground gas storages in salt rock were discussed. The results indicate that the hazard distance increases with the increase of operating pressure（or buried-depth） and pipeline diameter when a jet fire accident from the underground gas storages in salt rock happens. The quantitative assessment model will provide reference for quantitative hazard analysis of jet fire caused by gas leakage from underground gas storages in salt rock.