Prediction of change laws of temperature, pressure and phase state in supercritical CO<sub>2</sub> pipeline shutdown process

LI Xinze; SUN Chen; LIU Xiaofei; ZOU Weijie; JIANG Xingyu; GUO Lianghui; DONG Baojun; XING Xiaokai

doi:10.12434/j.issn.2097-2547.20240157

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Prediction of change laws of temperature, pressure and phase state in supercritical CO₂ pipeline shutdown process

- Prediction of change laws of temperature, pressure and phase state in supercritical CO₂ pipeline shutdown process
- Vol. 50, Issue 1, Pages: 143-152(2025)
- 作者机构：
  
  1.中国石油大学（北京）克拉玛依校区工学院，新疆克拉玛依 834000
  2.新疆多介质管道安全输送重点实验室，新疆乌鲁木齐 830011
  3.中国石油天然气股份有限公司规划总院，北京，100083
- 作者简介：
- 基金信息：
- DOI：10.12434/j.issn.2097-2547.20240157
  CLC： TE81
- Published：25 January 2025，
  
  Received：14 April 2024，
  
  Revised：12 May 2024，
- 稿件说明：
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LI XINZE, SUN CHEN, LIU XIAOFEI, et al. Prediction of change laws of temperature, pressure and phase state in supercritical CO₂ pipeline shutdown process. [J]. Low-carbon chemistry and chemical engineering, 2025, 50(1): 143-152.
DOI：

LI XINZE, SUN CHEN, LIU XIAOFEI, et al. Prediction of change laws of temperature, pressure and phase state in supercritical CO₂ pipeline shutdown process. [J]. Low-carbon chemistry and chemical engineering, 2025, 50(1): 143-152. DOI： 10.12434/j.issn.2097-2547.20240157.

摘要

不同于原油、天然气管道，超临界CO

管道在停输过程中，需要关注温度和压力共同作用下的CO

相态变化。掌握停输过程管道各位置流体温压变化关系、初始气化工况点和气化程度，对实现管道安全状态预判具有重要意义。基于中国石油天然气股份有限公司新疆油田分公司百万吨级超临界CO

管道示范工程KB CO

管道，建立了管道水力热力模型并求解，获得了管道停输后全线压力、温度、密度、持液率及相态变化规律，发现流体密度值与单位温降对应的压降值存在正相关性。基于Peng-Robinson状态方程，得到流体气化前压力、温度和密度变化的函数表达式，该温压关系在CO

相图中为相态迁移路径线的斜率值。该值主要受流体密度影响，流体密度500 kg/m

、650 kg/m

和800 kg/m

对应的斜率值分别为0.213、0.325和0.473。同时，给出了流体初始气化时的温压计算公式和气化后持液率变化预测公式。CO

相图中相态迁移路径线与气液平衡线的交点即为流体初始气化压力和温度点。CO

流体气化后，压力和温度状态点将沿着气液平衡线移动，直到温度降至管道周围土壤环境温度。采用OLGA软件对推导出的计算公式进行了验证，计算值与模拟值的误差在±4.00%以内，说明公式具有较高的准确性。最后应用公式对示范工程停输过程安全状态进行了预测，发现管道起点发生气化时的压力最高，为避免管道任意点发生气化，需在管道压力降至7.0 MPa前进行再启动操作。

Abstract

Different from crude oil and natural gas pipelines

it is necessary to pay attention to CO

phase change under the combined effect of temperature and pressure during the shutdown process of supercritical CO

pipeline

s. It is of great significance to master the temperature-pressure change relationship

initial gasification pressure and temperature and gasification degree during shutdown process

in order to predict pipeline safety status. Based on the KB CO

pipeline of PetroChina Xinjiang Oilfield Company’s million-ton supercritical CO

pipeline demonstration project

the pipeline hydrothermal model was established and solved to obtain the change of pressure

temperature

density

liquid-holding rate and phase state in whole pipeline after shutdown

and it is found that there is a positive correlation between density of fluid and pressure drop corresponding to unit temperature drop. Based on the Peng-Robinson equation of state

the functional expressions of pressure

temperature and density changes before fluid gasification were obtained

and this temperature-pressure relationship can be expressed as the slope value of phase migration path line in CO

phase diagram. This value is mainly affected by fluid density

and the slope values corresponding to fluid densities of 500 kg/m

650 kg/m

and 800 kg/m

are 0.213

0.325 and 0.473

respectively. At the same time

the equations for temperature and pressure during initial gasification of fluid and the prediction equations for change of liquid-holding rate after gasification were given. The intersection point of phase migration path line and gas-liquid equilibrium line in CO

phase diagram is the initial gasification pressure and temperature points of fluid. After the gasification of CO

fluid

the pressure and temperature state points will be shifted along the gas-liquid equilibrium line until the temperature is reduced to temperature of soil around pipeline. The derived formulas were verified using the industry-recognised OLGA software

and the errors between calculation values and simulation values are within ±4.00%. Finally

the formula was applied to predict the safety state of demonstra

tion project’s during shutdown process. It is found that the pressure at the starting point of pipeline when gasification occurs is the highest. In order to avoid gasification at any point of pipeline

the pipeline needs to be restarted before the pressure drops to 7.0 MPa.

关键词

超临界CO2管道输送停输过程相变

Keywords

supercritical CO2pipeline transportshutdown processphase transition

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Prediction of change laws of temperature, pressure and phase state in supercritical CO2 pipeline shutdown process

DOI：10.12434/j.issn.2097-2547.20240157

摘要

Abstract

关键词

Keywords

references

Prediction of change laws of temperature, pressure and phase state in supercritical CO₂ pipeline shutdown process