首页|超临界/密相CO2管道泄漏压力响应及低温规律实验研究

超临界/密相CO2管道泄漏压力响应及低温规律实验研究

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为进一步了解超临界/密相CO2 在管道泄漏过程中的压力响应和温度变化,基于自行设计的高压CO2 管道泄漏实验装置,探讨压力响应、温降特性和相态变化的相互作用机理,以及低温分布规律.研究结果表明:19 mm口径纯CO2 的压降曲线有明显的2 个阶段,且密相泄放存在明显的压力平台,N2 会明显提高泄放速率;相同截面上温度呈现"上热下冷"的分布特征,管道轴线方向,泄放端温降相对最严重;从相态变化角度看,超临界CO2 泄漏没有明显两相区,但对于密相而言,管道底部的CO2 会经历密相、液相、过热液相、气液两相、气相的相态转变过程.研究结果可为管道泄放安全运行以及规避断裂风险等方案设计提供参考.
Experimental study on leakage pressure response and low-temperature law of supercritical/dense phase CO2 pipeline
In order to understand the pressure response and temperature change law of supercritical/dense phase CO2 during pipeline leakage,based on the self-designed experimental device for high-pressure CO2 pipeline leakage,the interaction mech-anism of pressure response,temperature drop characteristics and phase transition was explored,as well as the low-temperature distribution law.The results show that the pressure drop curve of pure CO2 under 19 mm diameter has two obvious stages,and there is an obvious pressure platform in the leakage of dense phase,while N2 will obviously increase the leakage rate.The tem-perature on the same section presents the distribution characteristics of"upper hot and lower cold",and the temperature drop at the release end in the pipeline axis direction is the most serious.From the perspective of phase transition,there is no obvi-ous two-phase zone in supercritical CO2 leakage,and for the dense phase,the CO2 at the bottom of pipeline will undergo the phase transition process of dense phase,liquid phase,superheated liquid phase,gas-liquid two-phase and pure gas phase.The research results can provide reference for the safe operation of pipeline discharge and the avoidance of fracture risk.

carbon dioxidepipeline leakagepressure responselow-temperature lawphase transitionsupercritical/dense phase

张明、王海锋、胡其会、殷布泽、王一飞、柳歆、贾启运、丛思琦、杨腾

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中海油研究总院有限责任公司,北京 100020

中海油(天津)管道工程技术有限公司 天津市海底管道企业重点实验室,天津 300450

中国石油大学(华东)山东省油气储运安全重点实验室,山东 青岛 266000

二氧化碳 管道泄漏 压力响应 低温规律 相态变化 超临界/密相

中海石油(中国)有限公司科技项目国家重点研发计划项目

KJGG-2022-12-CCUS-01032022YFE0206800

2024

中国安全生产科学技术
中国安全生产科学研究院

中国安全生产科学技术

CSTPCD北大核心
影响因子:1.119
ISSN:1673-193X
年,卷(期):2024.20(7)