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Study on propagation characteristics of decompression wave of supercritical CO2 pipeline based on isochoric thermodynamics
- Low-carbon Chemistry and Chemical Engineering Vol. 49, Issue 7, Pages: 129-138(2024)
- 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
- 作者简介：
- 基金信息：
DOI：10.12434/j.issn.2097-2547.20240051
CLC： TQ022;TE832Published：25 July 2024，
Received：06 February 2024，
Revised：25 April 2024，
- 稿件说明：
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李欣泽,姜星宇,王德中等.基于等容热力学的超临界CO2管道减压波传播特性研究[J].低碳化学与化工,2024,49(07):129-138.
LI Xinze,JIANG Xingyu,WANG Dezhong,et al.Study on propagation characteristics of decompression wave of supercritical CO2 pipeline based on isochoric thermodynamics[J].Low-carbon Chemistry and Chemical Engineering,2024,49(07):129-138.
李欣泽,姜星宇,王德中等.基于等容热力学的超临界CO2管道减压波传播特性研究[J].低碳化学与化工,2024,49(07):129-138. DOI： 10.12434/j.issn.2097-2547.20240051.
LI Xinze,JIANG Xingyu,WANG Dezhong,et al.Study on propagation characteristics of decompression wave of supercritical CO2 pipeline based on isochoric thermodynamics[J].Low-carbon Chemistry and Chemical Engineering,2024,49(07):129-138. DOI： 10.12434/j.issn.2097-2547.20240051.
摘要
CO
2
管道泄漏的减压行为预测和断裂控制是CO
2
管道输送安全的重要研究方向，现有减压波预测模型存在气液两相声速计算误差大，临界点计算不易收敛等问题。基于等容热力学改进了当地声速计算方法，建立了新的减压波预测模型，计算分析了气体组成、初始相态、起始压力和起始温度等对减压波曲线和降压曲线的影响，并对实际工程中CO
2
管道泄漏的减压行为进行了预测。结果表明，相比燃烧后捕集或燃烧前捕集，富氧燃烧捕集气体下的初始减压波波速降低约26%，减压平台压力提高22%。随着减压过程进行，管内介质温度和压力工况点不再沿气液平衡线移动，而是直接进入气液两相区。超临界态的降压曲线与CO
2
泡点线的交点所对应的饱和压力比密相态的高约26%，减压平台压力较高。低运行温度和高运行压力能够有效降低减压平台压力。由于管道沿程运行参数的差异，管道断裂风险由管道起点依次降低，前段管段是高风险管段。本研究可为CO
2
管道设计和工程应用提供理论依据。
Abstract
Predicting the decompression behavior and controlling the fracture of CO
2
pipelines are crucial research areas for the safe transport of CO
2
. Existing decompression wave prediction models have problems such as large errors in calculating the sound speed of the gas-liquid two-phase flow and difficulties in convergence near the critical point. The local sound speed calculation method based on isochoric thermodynamics was improved and a new decompression wave prediction model was established. The effects of gas compositions
initial phase state
initial pressure
and initial temperature on decompression wave curves and pressure drop curves were calculated and analyzed. Additionally
the decompression behavior of CO
2
pipeline leaks in practical engineering scenarios was predicted. The results show that compare
d to post-combustion capture or pre-combustion capture
the initial decompression wave speed under gas by oxy-fuel combustion capture is reduced by approximately 26%
and the decompression plateau pressure increases by 22%. During the decompression process
the temperature and pressure operating point of medium inside the pipeline no longer move along the gas-liquid equilibrium line but directly enter the gas-liquid two-phase region. Compared to the dense phase state
the saturation pressure corresponding to the intersection of the pressure drop curve and the CO
2
bubble point line is about 26% higher in the supercritical state
and the decompression plateau pressure is higher. Lower operating temperatures and higher operating pressures can effectively reduce the decompression plateau pressure. Due to the differences in operating parameters along the pipeline
the risk of pipeline fracture decreases sequentially from the starting point of the pipeline
with the front section of the pipeline being the high-risk section. This study provides a theoretical basis for CO
2
pipeline design and engineering applications.
关键词
超临界CO2管道输送等容热力学减压波曲线降压曲线
Keywords
supercritical CO2pipeline transportisochoric thermodynamicsdecompression wave curvepressure drop curve
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