海上平台低压气回收机控制系统程序设计缺陷的逻辑优化

Logic Optimization of Program Design Defects in Control System of Low Pressure Recovery Compressor on Offshore Platform

海上某生产平台设有2台螺杆式低压气回收机用于对工艺流程中的低压伴生气进行提压回收,以此来降低平台的总碳排放。在一次低压回收机报故障关停后,发现PLC故障后主电机未停机仍在运行,只能通过配电盘断电才能使电机停止。通过梳理控制系统设计逻辑,结合故障现象进行深度分析,发现存在程序设计缺陷。在不影响原有停机逻辑的前提下,通过对控制系统程序进行修改优化,实现在PLC故障后触发整个系统停机的保护功能,提升了设备本质安全,为设备安全、稳定运行提供了保障。

An offshore production platform is equipped with two screw low-pressure recovery compressors to boost and recover the low-pressure associated gas in the process flow,so as to reduce the total carbon emission of the platform.After a failure shutdown of low-pressure recovery compressors,it was found that the main motor was still running without shutdown after PLC fault,and the motor could only be stopped by de-energizing the switchboard.Through the in-depth analysis of the control system design logic combined with the fault phenomenon,the design defects of the program were found.Without affecting the original shutdown logic,by modifying and optimizing the control system program,the protection function of triggering the shutdown of the whole system after PLC failure is realized,which improves the intrinsic safety of the equipment and provides a guarantee for the safe and stable operation of the equipment.