丙烯燃爆危险性分析

Analysis of Propylene Explosive Hazard

为预防丙烯氧化制环氧丙烷工艺流程中丙烯燃爆危险的发生,利用5 L爆炸极限测试仪测定丙烯在空气中常压不同温度条件下的爆炸极限,得到丙烯在常压下爆炸极限随温度的变化情况;针对丙烯工艺中的典型工况,采用11 L爆轰管测定不同工况温度、压力条件下,丙烯在空气中不同氧含量下的爆炸极限,并以此绘制爆炸极限三元图,得到不同工况条件下"丙烯-氧气-氮气"混合体系的燃爆区域。结果表明:随着温度、压力及氧气含量的升高,丙烯爆炸上限明显提高,但爆炸下限变化不明显;丙烯在80℃、0.24 MPa,130℃、0.96 MPa,40℃、1.90 MPa条件下的极限氧含量(LOC)分别为11.0%,10.2%和10.8%。降低体系中氧气含量有助于预防丙烯燃爆危险的发生。

For the purpose of preventing propylene explosion risk in production, propylene explosion lim-it was tested using 5L spherical exlosion device. The relationship between propylene explosion limit and temperature at ambient pressure and various temperature in air was studied. Propylene explosion limit was tested using 11L detonation tube at various initial temperature and pressure, therefor, the explosive ternary phase diagrams of ＂C3H6-O2-N2＂ were obtained. The results show that with the temperature, pressure and oxygen concentration rising, the upper explosion limit （UEL） goes up obviously elevate, but the low explosion limit （LEL） does not. Propylene LOC at 80 ℃ ,0. 24 MPa, 130 ℃ ,0. 96 MPa and 40 ℃, 1.90 MPa were 11.0 %, 10. 2 %, 10. 8 % respectively. Low concentration of oxygen in the system is ben-eficial to preventing propylene explosion.