摘要
由于CO_(2)具有较强的节流效应,超临界CO_(2)管道放空过程在管道内会形成低温区域,低于三相点可能生成干冰堵塞管道,甚至引发钢管低温脆断。设计1套超临界CO_(2)管道节流放空装置,研究不同初始温度条件下CO_(2)管道泄放过程中压降、温降及相态变化特性。研究结果表明:超临界CO_(2)管道泄放过程中,管道底部流体温度明显低于管道顶部流体温度,泄放过程中管内流体径向温差较大(如8.9 MPa、40℃工况时,最大径向温差达42℃);在初始压力几乎一样的情况下,工况2(初始压力8.88 MPa、初始温度33.5℃)初始温度虽大于工况1(初始压力8.8 MPa、初始温度26.5℃)初始温度,但2个工况最低温度都可达-70℃,这说明放空过程中管内最低温度不仅与初始温度有关,与初始温压条件下充装量及充装量差异引起的相变历程、相变吸热量有密切关系。研究结果为预防CO_(2)管道放空干冰堵塞或冻伤管道提供参考。
Due to the strong throttling effect of CO_(2),t he venting process of supercritical CO_(2) pipeline will form a low-temperature area inside the pipeline.Below the triple-phase point,the dry ice may be generated to block the pipeline,and even cause low-temperature brittle fracture of steel pipe.Design a set of supercritical CO_(2) pipeline throttling and venting device to study the pressure drop,temperature drop,and phase change characteristics during CO_(2) pipeline venting under different initial temperature conditions.The results show that during the venting process of supercritical CO_(2) pipeline,the fluid temperature at the bottom of pipeline is significantly lower than that at the top of pipeline.During the venting process,the radial temperature difference of the fluid inside the pipeline is relatively large(for example,under the working conditions of 8.9 MPa and 40℃,the maximum radial temperature difference reaches 42℃).Under almost the same initial pressure,although the initial temperature of condition 2(initial pressure 8.88 MPa,initial temperature 33.5℃)is higher than that of condition 1(initial pressure 8.8 MPa,initial temperature 26.5℃),the lowest temperature of both conditions can reach-70℃.This indicates that the minimum temperature inside the pipe during the venting process is not only related to the initial temperature,but also closely related to the phase change process and heat absorption caused by the filling amount and difference under the initial temperature and pressure conditions.The research results provide reference for preventing the dry ice blockage or frost damage in CO_(2) pipeline venting.
作者
杨腾
李玉星
王海锋
衣华磊
柳歆
胡其会
殷布泽
列斯别克·塔拉甫别克
丛思琦
路建鑫
YANG Teng;LI Yuxing;WANG Haifeng;YI Hualei;LIU Xin;HU Qihui;YIN Buze;Liesibieke·Talafubieke;CONG Siqi;LU Jianxin(Shandong Key Laboratory of Oil&Gas Storage and Transportation Safety,China University of Petroleum(East China),Qingdao Shandong 266580,China;Tianjin Enterprise Key Laboratory of Subsea Pipeline,CNOOC(Tianjin)Pipeline Engineering Technology Co.,Ltd.,Tianjin 300456,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)
出处
《中国安全生产科学技术》
CAS
CSCD
北大核心
2023年第S02期101-107,共7页
Journal of Safety Science and Technology
基金
国家重点研发计划项目(2022YFE0206800)
中海石油(中国)有限公司“十四五”科技项目(KJGG-2022-12-CCUS-0103)
关键词
CCUS
二氧化碳
管道放空
泄放实验
carbon capture,utilization and storage(CCUS)
carbon dioxide
pipeline venting
vent experiment
