摘要
中国的LNG接收站工程中外输首站在工艺流程、设计压力、材质选择等方面存在诸多差异。通过SPS软件对LNG接收站下游外输管道切断阀关闭工况进行模拟,指出了已建首站对低设计压力管道超压保护设计的有效性和局限性。结果表明:(1)当设计压力分界点设置在接收站出站ESD阀,即首站设计压力与外输管道设计压力一致时,接收站外输PAHH联锁关闭出站ESD阀无法保证首站本质安全,应使首站的设计压力大于关断工况下的最大压力或等于接收站外输系统设计压力;(2)通过合理地设置接收站与阀室的间距及相应的接收站外输PAHH联锁,首站下游管道可以避免切断阀关断工况下的运行超压;(3)优化后的首站工艺流程中,发球筒应设置充氮口,取消安全阀及排污口,站内手动放空宜依托接收站的火炬系统,不应用于下游线路管道放空。研究成果可指导LNG接收站工程外输管道超压保护和首站流程的设计。
In China’s LNG terminal project,there are many differences in the process flow,design pressure,material selection,etc.for initial transportation station.The closing condition of shut-off valve in downstream transportation pipeline of LNG receiving terminal was simulated by SPS,and compared to the overpressure protection design of pipeline with low design pressure,the effectiveness and limitation of the built initial station were pointed out.The results show that:(1)when the design pressure demarcation point is at the outgoing ESD valve of the receiving terminal,i.e.the design pressure of the initial station is consistent with that of the transportation pipeline,the closing of the outgoing ESD valve by transportation PAHH interlocking of the receiving terminal may not be able to insure the intrinsic safety of the initial station,so the design pressure of the initial station should be greater than the maximum pressure under the closing condition,or equal to the design pressure of the transportation system of the receiving terminal,(2)when the shut-off valve is closed,the downstream pipeline of the initial station is able to get rid of the overpressure in operation by reasonably setting the interval between the receiving terminal and the valve chamber,as well as the receiving terminal’s transportation PAHH interlock,and(3)in the optimized process flow of the initial station,the pig launcher should be provided with nitrogen charging port,and the safety valve and sewage outlet should be cancelled.The manual venting in the station shall rely on the flare system of the receiving terminal,instead of being used for the venting of the downstream pipeline.For a LNG receiving terminal project,the research results may be used to guide the design of overpressure protection of the transportation pipeline and the process design of the initial station.
作者
远双杰
孟凡鹏
安云朋
谭贤君
董平省
孙立刚
崔亚梅
张效铭
YUAN Shuangjie;MENG Fanpeng;AN Yunpeng;TAN Xianjun;DONG Pingsheng;SUN Ligang;CUI Yamei;ZHANG Xiaoming(China Petroleum Pipeline Engineering Corporation;PetroChina Pipeline R&D Center;China Petroleum Pipeline Engineering Co.Ltd.International)
出处
《油气储运》
CAS
北大核心
2020年第10期1178-1185,共8页
Oil & Gas Storage and Transportation
基金
国家重点研发计划项目“油气管道及储运设施安全风险评价技术研究”,2016YFC0802104。
关键词
天然气管道
LNG接收站
外输首站
设计压力分界
工艺流程
超压保护
natural gas pipeline
LNG receiving terminal
initial transportation station
design pressure demarcation
process flow
overpressure protection
