催化裂化装置蒸汽系统安全阀发生反冲的原因及治理

针对重油催化裂化装置中，中压蒸汽系统的安全阀当设备超压起跳时，巨大的泄放压力会对安全闽产生反冲力致使安全阀根部发生后仰。运用力学知识分析得出，安全阀反冲的根本原因是安全阀起跳后由于反冲力在连接管件根部产生的弯曲应力远远大于管子的最大许用应力，使安全阕起跳时管件发生弯曲。根据现场的实际情况，在安全阀的根部做加强筋板或在连接管与设备的焊接处进行补焊加强，解决了该安全隐患。

Causes of retroversion of safety valve in FCCU steam system and handling

When the safety valve of the FCCU medium pressure steam system is tripped at the equipment over-pressure,the large relieve pressure will produce a reactive thrust,which will retrovert the valve root.The root cause of retrovertion of safety valve found in dynamic analysis is that the bending stress at the root of the connection pipe resulted from retroversion at the tripping of safety valve is much greater than the maximum allowable stress of pipe,which will inevitably bend the pipe at stripping of safety va...