LNG接收站海水提升泵故障停车原因分析及对策

Cause analysis and countermeasures of LNG terminal seawater lift pump fault shutdown

结合中石化天津液化天然气有限责任公司天津LNG项目海水泵启动过程中出现冷却润滑增压泵振动超标、主泵导轴承及推力轴承温度急剧升高的问题,通过对冷却润滑系统工艺流程和控制系统逻辑的分析,查找出引起振动的主要原因是启泵过程中增压泵泵体内空气未排出。在充分利用现有装置设备的基础上,通过在控制系统中增加增压泵自动排空工艺控制过程,解决了海水增压泵振动超标问题。系统改造过程中无新设备增加或工艺流程改造,施工工作量小,施工周期短;控制系统改造方面仅在控制系统中增加可调排空时间计时器,充分利用厂商控制集成系统,不需要新增控制设备和模块,保证了控制操作系统的稳定性不受影响。

It mainly discusses the vertical long shaft seawater pump in Tianjin LNG project of SINOPEC Tianjin LNG Co.,Ltd.,the vibration of the cooling lubrication booster pump exceeds the standard and the temperature of the guide bearing and thrust bearing of the main pump increases sharply.By analyzing the process flow of the cooling and lubricating system and the logic of the control system,it is found that the main reason for the vibration is that the air in the booster pump body has not been discharged during the pump starting process.By adding the process control of automatic emptying of booster pump in the control system,the problem of over-standard vibration of seawater booster pump is solved on the basis of making full use of existing equipment.In the process of system transformation,there is no new equipment increase or technological process transformation,so the construction workload is small and the construction period is short.In the aspect of control system transformation,only an adjustable emptying timer is added to the control system,making full use of the manufacturer’s control integrated system,without adding control equipment and modules,ensuring the stability of the control operation system is not affected.