8000Nm^3/h空分装置的膨胀机增加平衡管前后效果分析

The Analysis of The Effect Before And After The Setting of Compensation Lines For The Booster Expanders of 8000Nm^3/h Air Separation Unit

8000Nm3/h新建空分装置于2008年6月4日正式投产后,由于两台增压透平膨胀机膨胀端轴承超温,先后5次联锁停车,经过检查确认是由于膨胀端叶轮背压高造成轴向推力不平衡,导致轴承受挤压摩擦生热,温度不断升高。通过将这部分背压气体对大气排放后,解决了温度高的问题,但造成新建空分装置的冷量和氮气的大量损失及次生的高速气流噪音污染,为此,通过与厂家的沟通确认,将这部分气体引至膨胀端的出口,获得了很好的效果。主要对增加平衡管前后的效果作了详细的分析比较。

Since the newly built 8000 Nm^3/h air separation unit going into production on July 4th 2008 ,there has been 5 times interlocks due to the over high temperature of the bearing near to the turbo wheel of the two booster expanders. After through examination,it was confirmed that the high pressure from the back of the turbo wheel caused the inbalance of axial thrust. So the bearing was compressed to generate heat and the temperature increased. By releasing this gas into the atmosphere, we can solve the probelm of over high temperature. However,it will cause a huge loss in cold and nitrogen as well as the noise pollution caused by high speed gas. Therefore, after the communication with the factory, the gas was lead to the exit of the two booster expander with two compensation lines to attain better effect. This paper is mainly focused on the analysis and comparison of the effect before and after the setting of compensation lines.