空分装置膨胀机冰堵及处理预防对策

Ice Blockage Treatment and Preventive Measures of Expander in Air Separation Unit

由于增压透平膨胀机膨胀端入口前空气夹带杂质,导致空气冷却时固态杂质累积在膨胀机的导流器和喷嘴叶片,发生了“冰堵”现象。长期运行下,膨胀机前后温降减少,增压机出口与膨胀机进口压差增大。通过膨胀机在线加温吹除“冰堵”后,膨胀机恢复制冷效果,空分装置工况恢复正常。介绍“冰堵”形成的原因和危害,相应的处理步骤及效果,并对此提出预防措施。

When purified air entrained impurities was cooled before the inlet of the expander,impurities were frozen accumulated in the deflector and nozzle blades at the expander,resulting in“ice blockage”.Under long-term operation,the range of temperature decreased and the pressure difference increased between the outlet of the booster and the inlet of the expander.After the ice blockage was removed by online heating and blowing of the expander,the cooling effect of expander returned to normal.The operating conditions of the air separation unit was stable again.The characteristics of ice blockage,corresponding treatment process and the effect of measure were introduced.Preventive measures were proposed.