地形起伏超临界CO_(2)管道两端阀室放空动态模拟  

Dynamic venting simulation of valve chambers at both ends of supercritical CO_(2) pipelines with topographic relief

作　　者：闫冰[1] 史博会[1] 陈俊文 汤晓勇 昝林峰 王妍静 李玉培 宫敬[1] YAN Bing;SHI Bohui;CHEN Junwen;TANG Xiaoyong;ZAN Linfeng;WANG Yanjing;LI Yupei;GONG Jing(College of Carbon Neutral Energy,China University of Petroleum(Beijing)/National Engineering Reasearch Center for Pipeline Safetyl/MOE Key Laboratory of Petroleum Engineering/State Key Laboratory of Natural Gas Hydrate/Beijing Key Laboratory of Urban Oil and Gas Distribution Technology;Southwest Branch of China Petroleum Engineering&Construction Corporation)

机构地区：[1]中国石油大学(北京)碳中和示范性能源学院·油气管道输送安全国家工程研究中心·石油工程教育部重点实验室·天然气水合物国家重点实验室·城市油气输配技术北京市重点实验室 [2]中国石油工程建设有限公司西南分公司

出　　处：《油气储运》2024年第5期561-569,共9页Oil & Gas Storage and Transportation

基　　金：中国石油工程建设有限公司西南分公司研究项目“《CO_(2)输送管道工艺与流动保障技术资料》对外技术咨询”,CPECC2021KJ01。

摘　　要：[目的]碳捕集,利用与封存(Carbon Capture, Utilization and Storage, CCUS)技术作为实现碳中和的重要手段,其中CO_(2)的安全高效输送是关键环节。超临界相CO_(2)管道输送已在国际上得到广泛应用,国内现已基本掌握了超临界CO_(2)管道稳态输送的工艺规律,但对于具有起伏地形的超临界CO_(2)管道放空作业的动态规律和安全风险认识尚不够深入。[方法]借助OLGA软件,建立具有起伏地形的超临界CO_(2)管道两端阀室放空物理模型,开展管道放空的动态模拟分析,揭示了放空过程中主管道内低温现象的物理本征,探讨了地形起伏超临界CO_(2)管道放空过程中的关键问题,特别关注了地形起伏对相态变化、低温风险及干冰生成的影响,提出了控制背压的安全放空方案。[结果]具有地形起伏超临界CO_(2)管道放空应尽量避免在高压、低温下进行;需设计适宜的放空管径和开度,以规避低温脆断、干冰生成等风险;所提出的放空方案在具体地形条件下表现良好,能有效解决主管道放空过程中低洼地段的极致低温问题,并对放空出口的危害较小。[结论]研究成果为地形起伏地区超临界CO_(2)管道的安全放空工艺设计与工程建设提供了理论支持,对工程实际应用具有参考价值,有助于保障CO_(2)管道的安全高效输送。[Objective]Carbon capture,utilization and storage(CCUS)is essential for achieving carbon neutrality,in which the safety and efficiency of CO_(2) transmission plays a vital role.The pipeline transmission of CO_(2) in the supercritical phase has been widely applied internationally and China has basically mastered the rules to the process of supercritical CO_(2) pipelines steady-state transmission.However,further research is required to enhance understanding of the dynamic rules and safety risks associated with venting operations for supercritical CO_(2) pipelines with topographic relief.[Methods]Using OLGA,a physical model was developed for venting valve chambers at both ends of supercritical CO_(2) pipelines with topographic relief.A dynamic simulation analysis of pipeline venting was conducted,revealing the physical nature of the low-temperature phenomenon in the main pipeline during venting.Key issues in the venting process of the supercritical CO_(2) pipeline with topographic relief were discussed,focusing on the effects of topographic relief on phase transition,low-temperature risks,and dry ice formation.Finally,a safe venting scheme for backpressure control was suggested.[Results]The venting of supercritical CO_(2) pipelines with topographic relief should avoid high pressure and low temperatures as much as possible;appropriate venting pipe diameter and opening need to be designed to prevent risks such as low-temperature brittle fracture and dry ice formation;the suggested venting scheme was effective under specific terrain conditions,addressing extremely low temperatures in low-lying sections during main pipeline venting while minimizing harm at the venting outlet.[Conclusion]The research results offer theoretical backing for the safe venting process design and engineering construction of supercritical CO_(2) pipelines with topographic relief,holding practical value for engineering applications and contributing to ensuring the safe and efficient transmission of CO_(2) pipelines.

关 键 词：超临界CO_(2) 放空 低温风险 相态变化 

分 类 号：TE832[石油与天然气工程—油气储运工程]