可燃气体-空气-氮气混合物爆炸极限的预测

Prediction of flammability limits of gaseous mixtures of combustible-air-nitrogen

可燃气体爆炸是工业生产中时有发生的重大灾害事故类型之一,爆炸极限是判断其爆炸危险性的一个重要参数。工业过程中常采用向被保护的设备中引入惰性气体的方法来防止爆炸事故的发生。本研究采用计算绝热火焰温度法,对几种常见的有机可燃气体与氮气混合物的爆炸极限范围进行预测计算,并将计算值与文献值进行比较。结果表明该方法对爆炸下限的预测与实验值吻合程度较好,对爆炸上限的预测则存在一定的误差,并对产生误差的主要原因进行分析。

Explosions of flammable gases were the possible major disasters occurring in industrial processes,and the flammability limits were important parameters to judge the explosion risk of flammable substances.Inerting was a common procedure in process industries to lower the likelihood of explosion by adding an inert gas to a combustible mixture.The inert gas was usually nitrogen or carbon dioxide.In this study,the calculated adiabatic flame temperatures（CAFT） were used to forecast the flammability limits of several organic flammable gases diluted with inert nitrogen,and the calculated values were compared with observed values in available literatures.It was found that the CAFT method could well describe the lower flammability limit of combustible diluted with inert nitrogen,while deviation existed between the observed and calculated values in the case of upper flammability limit,and the main reasons of the error were analyzed.