镇海乙烯装置急冷油减粘系统运行分析

OPERATION ANALYSIS OF QUENCH OIL VISCOSITY DECREASING SYSTEM IN THE ETHYLENE PLANT IN ZHENHAI

镇海乙烯装置从首次开工之初,减粘系统运行状态不稳定,运行参数偏离设计值,减粘塔塔釜管线出现堵塞现象,威胁装置高负荷平稳运行。通过对出现的异常现象进行分析采取应急措施避免减粘塔系统局部停工,并提出避免急冷器结焦和大块焦块进入塔釜管线的解决方案。方案实施后减粘系统工况明显好转,保证了装置高负荷、平稳运行。

Since the startup of the ethylene plant in Zhenhai,the operation of its viscosity decreasing system had been unstable,the operation parameters had deviated from the design values,and the bottom pipeline of the viscosity decreasing tower had been plugged, thus threatening the smooth operation of the ethylene plant at high load. By analyzing the abnormal phenomenon,some emergency measures were taken to avoid the local shutdown of the viscosity decreasing system,and some solutions were put forward to avoid the coking of quench cooler and to prevent bulk coke from entering the bottom pipeline. After implementation,the operation conditions of the viscosity decreasing system were improved markedly,and the smooth operation of the ethylene plant at high load was ensured.