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[1]张对红　丛思琦　胡其会　程磊　列斯别克·,塔拉甫别克　韩辉　李兆兰.初始温压对超临界/密相CO2管道泄放影响实验[J].油气储运,2024,43(05):1-15.
　ZHANG Duihong,CONG Siqi,HU Qihui,et al.Diffusion experiment for CO2 pipeline leaks and safety distance measurement[J].Oil & Gas Storage and Transportation,2024,43(05):1-15.

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初始温压对超临界/密相CO₂管道泄放影响实验

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年05期页码: 1-15 栏目: 出版日期: 2024-05-25

Title:: Diffusion experiment for CO₂ pipeline leaks and safety distance measurement

作者:: 张对红　丛思琦　胡其会　程磊　列斯别克·塔拉甫别克　韩辉　李兆兰

Author(s):: ZHANG Duihong; CONG Siqi; HU Qihui; CHENG Lei; Liesibieke·TALAFUBIEKE; HAN Hui; LI Zhaolan

关键词:: CO₂管道; 泄放实验; 浓度扩散; 温降

Keywords:: CO₂ ; pipelines; Venting experiments; Concentration diffusion; Temperature drop

分类号:: TE832

文献标志码:: A

摘要:: 【目的】工业CO₂管道输送一般维持在超临界/密相高压运行，一旦发生管道泄漏，泄漏口附近区域将产生高浓度CO₂，对周围人员、生物等带来严重伤亡威胁。目前针对CO2管道泄漏影响范围和安全距离定量分析评价的研究较为欠缺，为探究超临界/密相CO₂管道泄漏扩散规律，得到不同CO₂暴露浓度下的安全距离，【方法】采用自主设计的大型CO₂管道泄放扩散实验装置，开展不同压力和温度条件下的CO₂管道泄放实验，研究泄放后扩散区域的CO₂浓度变化规律及典型体积分数下CO₂的影响范围。【结果】在实验压力和温度范围内，①近泄放口处CO₂的体积分数主要受射流作用影响，在所有实验工况中，5 m处CO₂体积分数最高可达70%，10 m处CO₂体积分数均低于8%。计算得到距离泄放口5 m远处体积分数大于4%的CO₂泄放持续时间最长达到125 s，随着管内压力的升高，CO₂体积分数大于4%的泄放持续时间更久。②距离泄放口较远处CO₂的体积分数受湍流扩散和环境风速、风向的影响，管内压力在7.5~10.5 MPa时，体积分数4%的CO₂扩散的最远距离为32 m；管内运行温度20~40 ℃时，体积分数4%的CO₂扩散的最远距离为20 m。③CO₂管道泄放后，扩散区温度也会降低，随着初始压力的升高或管内初始温度的降低，扩散区的温降增大。【结论】管内运行压力越高或管内初始温度越低时，CO₂的扩散距离越远，但环境风会影响CO₂扩散距离。在工业CO₂管道发生泄放后，不仅要根据CO₂管道运行状态，还要结合环境风速和风向综合考虑来进行危险区域划定。

Abstract:: Supercritical/dense-phase high-pressure operation is frequently maintained in industrial CO₂ pipeline transportation. When the pipeline leaks, the area near the leakage port produces a high concentration of CO₂, posing a major threat to the surrounding persons and creatures. Currently, there is a dearth of quantitative investigation and evaluation about the safety distance and affect range of CO₂ pipeline leaks. In order to investigate the change rule of CO₂ concentration of leakage diffusion and the influence range of typical volume fraction CO₂, we conducted CO₂ pipeline leakage experiments under various pressure and temperature conditions using a sizable CO₂ pipeline leakage and diffusion experiment device that we designed. Jet flow is the primary factor influencing the volume percentage of CO₂ at the vent within the experimental pressure and temperature range. Under all experimental settings, the CO₂ volume fraction at 5 m can reach 70%, but at 10 m, it falls below 8%. The longest CO₂ release duration (exposure time) is estimated to be 125s when the volume percentage of CO₂ is more than 4% at a distance of 5 meters from the release port. This duration increases as the pressure in the pipe increases. The direction and speed of the wind as well as turbulent diffusion have an impact on the volume fraction of CO₂ far from the vent. With a 4% volume fraction, the farthest diffusion distance of CO₂ is 32 meters when the pipe pressure is between 7.5 MPa and 10.5 MPa. The maximum diffusion distance of 4% CO₂ is 20 meters when the tube's operating temperature is between 20 ℃and 40 ℃. The temperature in the diffusion zone will likewise drop following a CO₂ pipeline leak, and this temperature drop will get worse if the pipe's pressure increases or as the pipe's initial temperature drops. The experimental results show that the CO₂ diffusion distance will increase with increasing operating pressure or decrease with initial tube temperature. The direction and speed of the wind will also have an impact on the CO₂diffusion distance. As a result, following an industrial CO₂ pipeline leak, it's important to identify the hazardous area by taking into account the ambient wind speed and direction in addition to the CO₂ pipeline's operational status.

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[4]张对红　丛思琦　胡其会　程磊　列斯别克塔拉甫别克　韩辉　李兆兰.初始温压对超临界/密相CO2管道泄放影响实验[J].油气储运,2024,43(05):1.
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更新日期/Last Update: 2024-01-23