为对大型全压力式液化烃球罐紧急切断阀的设置及选型提供指导,针对国内某大型项目6座3 000 m3全压力式液化烃球罐进出口管道上的紧急切断阀设计方案进行研究，着重对紧急切断阀的设置依据、设置方式、阀体及执行机构的选型进行对比、分析。研究表明:1)推荐在大型全压力式液化烃球罐进出口液相管道上设置双阀,分别为紧急切断阀和远程操作阀;2)紧急切断阀靠近球罐布置,安装位置宜尽量靠近球罐的第一道法兰密封面,参与SIS安全系统控制,与球罐的高高、低低液位等联锁;3)远程操作阀布置在防护墙外,应便于操作和维修且应易于迅速接近,参与DCS过程控制系统;4)紧急切断阀和远程操作阀具备仪表风气源可利用时,优先选择气动执行机构。研究结果可为大型全压力式液化烃球罐进出口紧急切断阀的选型和设置提供借鉴。

In order to provide guidance on the installation and selection of emergency shut-off valve for fully pressurized liquefied hydrocarbon spherical tanks, the design for the emergency shut-off valve on the inlet and outlet pipelines of six 3000 m³ fully pressurized liquefied hydrocarbon spherical tanks for a large domestic project is studied. Comparison and analysis have been performed focusing on the basis and method for process system configuration, selection of valve body and actuator of the emergency shut-off valve. From the study, it is concluded that: 1) it is recommended to install double valves on the liquid inlet and outlet pipelines of the large liquefied hydrocarbon spherical tank, namely emergency shut-off valves and remote operation valves; 2) The emergency shut-off valve is arranged close to the spherical tank. The valve installation position shall be as close as possible to the first flange sealing surface of the spherical tank to connect the SIS safety system, interlocking with the high-high, low-low liquid level control of the spherical tank; 3) The remote operation valve is installed outside the dike and shall be easy to operate and maintain and be easily accessible. The remote operation valve shall connect with DCS process control system; 4) Pneumatic actuators are preferred for emergency shut-off valves and remote operation valves when instruction air is available. The research results can provide reference for the selection and configuration of the emergency shut-off valve for the inlet and outlet pipes of the fully pressurized liquefied hydrocarbon spherical tanks.