加油站维修改造中油罐的气体置换方案

Gas Replacement Scheme of Oil Tank in Gas Station Maintenance and Reconstruction

在对加油站维修改造中置换油罐气体常用的氮气、二氧化碳、氫气、七氟丙烷JG541等惰性气体的特征、市场价格、密度、灭火效果、对环境的影响程度等进行介绍和综合比较的基础上,提出油罐气体置换二氧化碳为首选,其次是氮气。分别阐述了控制氧浓度计算法和灭火系统计算法并对不同罐容的氮气或二氧化碳注入量进行了计算。指出前一种算法适用组分单一或爆炸极限明确的可燃气体,后一种算法适用于组分复杂或爆炸极限未知的可燃气体。同时说明了油罐气体置换施工中应当注意的一些问题。可为有关加油站维修改造过程中油罐气体置换施工提供参考。

Based on the introduction and comprehensive comparison of the characteristics,market price,density,fire-fighting effect and environmental damage degree of the inert gases such as nitrogen,carbon dioxide,argon,heptafluoropropane and IG541,which are commonly used in oil tank gas replacement during the maintenance and reconstruction of gas station,it is put forward that carbon dioxide is the first choice of oil tank gas replacement medium,followed by nitrogen.Using the calculation method of controlling oxygen concentration and the calculation method of fire extinguishing system,the amount of nitrogen or carbon dioxide used in the replacement of different tank capacity is calculated,respectively.Some problems needing attention in the gas replacement operation of oil tank are put forward,which can provide a reference for the gas replacement of oil tank in the process of maintenance and reconstruction of gas station.