LNG接收站扩建储罐工程预冷工艺方案设计及建议  

Pre-cooling scheme design and suggestions for storage tank expansion project in LNG terminal

作　　者：刘光晓[1] 吴旸剑 董贵君 赵伟强 张旭[1] LIU Guangxiao;WU Yangjian;DONG Guijun;ZHAO Weiqiang;ZHANG Xu(Offshore Oil Engineering Co.Ltd.)

机构地区：[1]海洋石油工程股份有限公司

出　　处：《油气储运》2023年第5期517-524,共8页Oil & Gas Storage and Transportation

摘　　要：与接收站同步投产的储罐相比,扩建储罐的预冷工艺具有较大差异。针对扩建储罐预冷工艺方案研究较少的问题,为积累理论和工程经验,以某大型沿海LNG接收站扩建储罐项目为例,结合该接收站工艺流程,分析扩建与新建储罐工程之间的差异,并对4种LNG填充方法进行适用性分析,开展扩建储罐预冷工艺方案设计,形成了预冷关键流程与工艺指标,包括卸料管道预冷、卸料管道填充、氮气置换、储罐预冷、储罐充液静置、低压外输管道预冷填充及排净管道预冷填充。实例应用结果表明:设计形成的预冷方案操作工艺简单,且储罐、管道温降速率符合标准要求,预冷成效良好。该项目预冷工艺对后续扩建储罐项目普适性较好,可为后续项目预冷方案编制、现场预冷操作及关键工艺指标选取提供借鉴和参考。(图5,表1,参23)Compared with the storage tanks put into operation synchronously with the LNG terminal,the pre-cooling process for the expanded storage tank varies greatly.As few studies were carried out on the pre-cooling scheme for storage tank expansion,the differences between storage tank expansion projects and new projects were analyzed with reference to the process flow of the terminal based on the storage tank expansion project of a large coastal LNG terminal.Meanwhile,the adaptability of 4 LNG filling methods was analyzed,and the pre-cooling scheme was designed for the expanded storage tanks,thereby forming the key procedure and process indicators of pre-cooling,including the pre-cooling of the LNG discharge pipeline,filling of the LNG discharge pipeline,nitrogen replacement,pre-cooling of the storage tank,storage tank filling and standing,and the pre-cooled filling of low-pressure export pipeline and emptying pipeline.The case application results of the project show that the designed scheme is easy to operate in process,the cooling rate of the storage tank and the pipeline is as specified in the standard,and the good effect of pre-cooling is realized.The pre-cooling scheme is generally applicable to the subsequent storage tank expansion projects,which could provide a reference for the preparation of the pre-cooling scheme,the on-site precooling operation,and the selection of key process indicators.

关 键 词：LNG接收站 扩建储罐 预冷方案 工艺指标 

分 类 号：TE821[石油与天然气工程—油气储运工程]