The venting operation is a primary measure to mitigate overpressure in CO₂ transport pipelines. It involves intense oscillations and the threat of low temperatures arising from the throttling effect. Multistage throttling structures have been proven to effectively enhance the stability of the system, and the objective of this study is to explore the impact of multistage throttling structures on the pressure and temperature within the throttling structure using a one-dimensional model. The results indicate that by appropriately setting the numbering of valves, valve openings, and diameter of throttling pipes, multistage throttling can effectively elevate the temperature of the throttling structure. However, it is noteworthy that achieving the avoidance of low-temperature phenomena comes at the expense of reducing the pressure drop rate within the main pipeline. Therefore, the practical application should consider a balanced approach to both the low temperature in the throttling structure and the overpressure in the main pipeline.

中文翻译：

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多级节流结构对放空运行影响的理论研究


放空操作是缓解 CO ₂ 运输管道超压的主要措施。它涉及强烈的振荡和节流效应引起的低温威胁。多级节流结构已被证明可以有效增强系统的稳定性，本研究的目的是利用一维模型探讨多级节流结构对节流结构内压力和温度的影响。结果表明，通过适当设置阀门数量、阀门开度和节流管道直径，多级节流可以有效提高节流结构的温度。然而值得注意的是，避免低温现象的代价是降低主管道内的压降率。因此，实际应用中应考虑对节流结构中的低温和主管路中的超压采取平衡的处理方法。