进口温压和管道传热系数对超临界CO2管输特性影响研究

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进口温压和管道传热系数对超临界CO2管输特性影响研究
Influence of inlet temperature and pressure and heat transfer coefficient of pipelines on supercritical CO2 pipeline transportation characteristics

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DOI:: 10.3969/j.issn.1001-2206.2025.04.004

作者:: 任长胜, 张树弘
REN Changsheng, ZHANG Shuhong

作者单位:: 1. 国家石油天然气管网集团有限公司科学技术研究总院分公司, 天津 300457;2. 国家石油天然气管网集团有限公司甘肃分公司, 甘肃兰州 620100

关键词:: 超临界CO2; 模拟; 管道输送; 输送距离
supercritical CO2;simulation;pipeline transportation;transportation distance

摘要:: 基于连续性方程、动量方程和能量方程，建立了超临界CO₂一维管道流动模型，并对进口温度与压力以及管道传热系数对超临界CO₂管输特性的影响进行了研究。结果表明，随着进口温度增加，管道沿程温降、压降、安全输送距离均增大；随着进口压力的增加，温降幅度增大，压降幅度减小，对安全输送距离和进口压力存在最优值，压力过高会加速CO₂向亚临界状态转变；随着管道传热系数增加，管道沿程温降幅度增大，压降幅度减小，安全输送距离呈下降趋势。针对长度200 km的超临界二氧化碳管道，进口温度>65℃、进口压力为10 MPa、传热系数≤1.0 W/（m²·K）时，可保证管输CO₂全程维持在超临界状态安全运行。

This paper builds a one-dimensional pipeline flow model of supercritical CO₂ based on the continuity equation, momentum equation and energy equation, and studies the influence of the inlet temperature and pressure and heat transfer coefficient of pipelines on supercritical CO₂ pipeline transportation characteristics. The results show that as the inlet temperature increases, the drops in temperature and pressure, and the safety transportation distance along the pipelines all grow. Additionally, the decrease amplitude of temperature and pressure increases and decreases respectively with the rising inlet pressure. There is an optimal value of inlet pressure for the safe transportation distance, and too high pressure will accelerate the transformation of CO₂ to the subcritical state. As the heat transfer coefficient of pipelines increases, along the pipelines, the decrease amplitude of temperature and pressure increases and decreases respectively, with the safe transportation distance showing a tendency to decrease. For a 200 km supercritical CO₂ pipeline, the inlet temperature of more than 65 ℃, inlet pressure of 10 MPa, and heat transfer coefficient≤1.0 W/(m²·K) can ensure that the safe operation of CO₂ is in the supercritical state throughout the entire process.