环氧氯丙烷工艺中分离罐气相出口的燃爆危险性分析

Blast Risk Analysis of Gas Phase of Knockout Drum through ECH Technology

环氧氯丙烷生产工艺中双氧水分解产生的氧气与含氯丙烯、环氧氯丙烷、甲醇的可燃气体混合存在燃爆危险,为预防燃爆发生,利用5L爆炸极限测试仪测定分离罐气相出口可燃气在不同氧气浓度条件下的爆炸极限,并以此绘制爆炸极限三元图,得到不同工况条件下"可燃气-氧气-氮气"混合体系的燃爆区域。结果表明:随着氧气浓度的升高,可燃气爆炸上限明显提高,但爆炸下限变化不明显;随温度上升,气相出口组分发生变化,LOC值逐渐降低;正常冷却条件下极限氧含量为12%,冷却效果差时为10%,冷却失效时为9.3%;设置氧浓度报警时参考最小LOC值,留出裕度空间,控制体系氧含量小于5%有助于预防燃爆发生。

There is blast risk in mix of oxygen dis- solved by hydrogen peroxide in ECH production tech- nology with the combustible gases of chloropropene, ECH and methanol. To prevent from the blast, 5L ex- plosion limit tester is used to test the explosion limit of combustible gas at gas phase of knockout drum un- der different conditions of oxygen concentration to draw ternary chart of explosion limit and get blast ar- eas of the mixed system of ＂combustible gas, oxygen and nitrogen＂ under different working conditions. The resuh manifests that along with the rise in oxygen concentration, the upper explosion limit of combusti- ble gas is obviously increased. However, the changes in lower explosion limit are not obvious： along with the rise in temperature, there are changes in exit of gas phase and LOC value is reduced gradually; the limit inferior oxygen content is 12% under the normal cooling condition and it is 10% when the cooling ef- fect is undesirable and 9.3 when the cooling is inval- id; when setting the oxygen concentration alarm, please refer to the smallest LOC value and leave out marginal space. It is conducive to prevent from the blast when the content of controlled system＇ s oxygen is smaller than 5%.