N2和CO2惰化丙烯爆炸极限参数实验研究

Experimental study on explosion limits parameters of propylene with dilution of nitrogen and carbon dioxide

为得到惰化条件下丙烯的爆炸极限参数的变化规律,采用标准的可燃性气体爆炸极限测试装置(GB/T 12474-2008),测试研究了N2和CO2对丙烯的爆炸极限、临界氧浓度和最小氧浓度的影响,并绘制了C3H6-N2/CO2-Air爆炸三角形图,对比分析了N2和CO2对丙烯爆炸极限参数的惰化效果。结果表明,添加N2和CO2都会缩小丙烯爆炸极限范围,减小爆炸的危险度。N2惰化条件下,丙烯爆炸上下限重合时N2添加量为49%,临界氧浓度为9.79%;在CO2惰化条件下,丙烯爆炸上下限重合时,CO2的添加量为34%,临界氧浓度为12.94%。在丙烯浓度不变的情况下,发现CO2惰化氛围下的最小氧浓度值均高于N2惰化条件下的。两种惰化工况下的丙烯爆炸三角形结果显示,在CO2惰化的爆炸区域明显小于N2惰化下的;当添加惰性气体使丙烯处于完全惰化状态时,CO2的窒息比和添加量均小于N2。本文的实验数据及结论可为进一步研究丙烯爆炸和工业丙烯安全防爆工作提供理论基础。

To investigate explosion limits parameters of propylene with inert gas dilution,the explosion limits,critical oxygen concentration and minimum oxygen concentration of propylene,with the dilution effect of N2 and CO2,were determined by using a standard equipment on basis of GB/T 12474-2008.Furthermore,the explosion triangle diagram of C3H6-N2/CO2-Air was proposed,and in this way the inertial effect of N2 and CO2 on propylene explosion was obtained and analyzed.The results show that the addition of N2 and CO2 will reduce the explosion limit of propylene and reduce the risk of explosion.More specifically,the addition of N2 in 49%would merge the upper and lower explosion limits of propylene which the critical oxygen concentration was 9.79%.While for that of CO2,the corresponding added volume fraction and the critical oxygen concentration are 34%and 12.94%,respectively.For each propylene at a specific volume fraction,the value minimum oxygen concentration inerted by CO2 was higher than that of inerted by N2.Moreover,the explosion triangle diagram shows that the explosive area diluted by CO2 is much smaller than that diluted by N2.It takes more less CO2 in volume to completely inert propylene explosion,compared with N2.The obtained data can provide fundamental parameters for the prevention of propylene explosion in related industries.