Numerical simulation study of low-temperature evolution characteristics of supercritical CO<sub>2</sub> pipelines under different blowdown strategies

GUO Fujiang; WANG Kai; YUAN Shining; MAO Gangtao; DING Yao

doi:10.12434/j.issn.2097-2547.20260002

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Numerical simulation study of low-temperature evolution characteristics of supercritical CO₂ pipelines under different blowdown strategies

更新时间：2026-04-27

- Numerical simulation study of low-temperature evolution characteristics of supercritical CO₂ pipelines under different blowdown strategies
- Pages: 1-11(2026)
- 作者机构：
  
  1.北京石油化工学院深水油气管线关键技术与装备北京市重点实验室，北京 102617
  2.中海油（天津）管道工程技术有限公司，天津 300450
  3.中石化石油勘探开发研究院，北京 102206
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20260002
  CLC： X937;TE832
- Received：03 January 2026，
  
  Revised：2026-02-04，
  
  Online First：24 April 2026，
- 稿件说明：
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郭富江,王凯,苑世宁等.超临界CO₂管道不同泄放策略下低温演化特性的数值模拟研究[J].低碳化学与化工,

GUO Fujiang,WANG Kai,YUAN Shining,et al.Numerical simulation study of low-temperature evolution characteristics of supercritical CO₂ pipelines under different blowdown strategies[J].Low-Carbon Chemistry and Chemical Engineering,
郭富江,王凯,苑世宁等.超临界CO₂管道不同泄放策略下低温演化特性的数值模拟研究[J].低碳化学与化工, DOI：10.12434/j.issn.2097-2547.20260002.

GUO Fujiang,WANG Kai,YUAN Shining,et al.Numerical simulation study of low-temperature evolution characteristics of supercritical CO₂ pipelines under different blowdown strategies[J].Low-Carbon Chemistry and Chemical Engineering, DOI：10.12434/j.issn.2097-2547.20260002.

摘要

超临界CO

管道在泄放过程中受节流效应影响易出现显著温降，可能诱发材料冷脆和冻堵等安全风险。因此，在工程实践中亟需在保障管道完整性前提下提升泄放效率和可控性。基于OLGA软件构建了超临界CO

管道模型，分别在单端泄放和两端同时泄放工况下，分析了泄放口径对温压演化特征和泄放时间的影响。在此基础上，提出了一种融合分级降压与分区协同思想的“两端交替泄放”策略，并评估了不同泄放口径组合下，该策略在抑制极端温降和提升泄放效率方面的综合调控效果。结果表明，在单端泄放和两端同时泄放工况下，增大泄放口径虽可显著提升泄放速率，但最低温度显著降低，部分工况降至-70 ℃，冷脆失效风险较大，因此难以兼顾安全性与泄放效率。相比之下，两端交替泄放策略通过阶梯式释放压力和非泄放侧换热回温，有效削弱了单次节流强度，抑制了极端温降，使最低温度高于-30 ℃，总泄放时间控制在8.0 h以内。其中，“75 mm + 25 mm”口径组合在保证结构安全的同时，在设定工况下将总泄放时间缩短至约5.0 h，较好平衡了泄放过程的安全性与效率。本文提出的交替泄放思路可为超临界CO

管道泄放过程的低温风险防控和放空工艺优化提供参考。

Abstract

During the blowdown of supercritical CO

pipelines

significant temperature drops are likely to occur due to the throttling effect

which may induce safety risks such as material cold brittleness and blockage. Therefore

in engineering practice

it is necessary to improve the blowdown efficiency and controllability under the premise of ensuring pipeline integrity. A supercritical CO

pipeline model was established based on OLGA

and the effects of vent diameter on temperature and pressure evolution characteristics as well as blowdown time were analyzed under single-end venting and simultaneous dual-end venting conditions. On this basis

an “alternating dual-end venting” strategy integrating staged depressurization and zonal coordination was proposed

and its combined regulation performance in suppressing extreme temperature drops and improving blowdown efficiency was evaluated under different vent diameter combinations. The results show that

under single-end venting and simultaneous dual-end venting conditions

increasing the vent diameter can significantly enhance the blowdown rate

but the minimum temperature decreases markedly

reaching -70 ℃ under some conditions

resulting in a high risk of cold brittle failure. Therefore

it is difficult to balance safety and blowdown efficiency. In contrast

the alternating dual-end

venting strategy effectively weakens the throttling intensity of each release and suppresses extreme temperature drops through stepwise pressure release and heat recovery on the non-venting side

maintaining the minimum temperature above -30 ℃ and controlling the total blowdown time within 8.0 h. Among them

the “75 mm + 25 mm” diameter combination shortens the total blowdown time to about 5.0 h under the specified conditions while ensuring structural safety

achieving a better balance between safety and efficiency of the blowdown process. The alternating venting concept proposed in this study can provide a reference for low-temperature risk prevention and venting process optimization in supercritical CO

pipeline blowdown.

关键词

Keywords

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Numerical simulation study of low-temperature evolution characteristics of supercritical CO2 pipelines under different blowdown strategies

DOI：10.12434/j.issn.2097-2547.20260002

摘要

Abstract

关键词

Keywords

references

Numerical simulation study of low-temperature evolution characteristics of supercritical CO₂ pipelines under different blowdown strategies