裂解气压缩机系统长周期运行中的问题及对策

PROBLEMS IN LONG PERIOD OPERATION OF CRACKING GAS COMPRESSOR SYSTEM AND THE COUNTERMEASURES

裂解气压缩机是乙烯装置的“心脏”,其能否保持高效运行对乙烯装置的“安稳长满优”运行至关重要。介绍了中国石油独山子石化分公司1000 kt/a乙烯装置裂解气压缩机系统自开工以来出现的问题,分析了产生这些问题的原因,并采取合理的措施解决了低压阀全开、锅炉给水中SiO_(2)超标、结垢引起的轴位移增大、透平启机期间排汽温度高、分离罐捕沫器损坏、二段吸入罐高液位和关键仪表及调节阀故障等问题,进而保证乙烯装置长周期稳定运行。

Cracking gas compressor is the core of ethylene plant,and its ability to maintain efficient operation is critical to the safe and stable operation of ethylene plant.This paper focuses on the problems that had occurred since the startup of a 1000 kt/a ethylene plant,analyzes the causes of these problems,and takes reasonable measures to solve the problems including the full opening of low pressure control valve,the over high SiO_(2)content of boiler feed water,the increase in shaft displacement due to fouling,the high exhaust steam temperature during turbine startup,the breakdown of mist eliminator of separation tank,the high level of two-stage suction tank and the failure of critical instrument and regulating valve,thus guaranteeing the long period and stable operation of the ethylene plant.