适用于超临界CO<sub>2</sub>管道瞬态过程模拟的软件评价

马馨苑; 欧阳欣; 朱建鲁; 陈俊文; 刘罗茜; 杨腾; 宋光春

doi:10.6047/j.issn.1000-8241.2024.05.012

适用于超临界CO₂管道瞬态过程模拟的软件评价

Adaptability evaluation of the software for transient process simulation of supercritical CO₂ pipelines

摘要

摘要:
目的 CO₂管道运行过程中涉及泄漏、投产等瞬态过程，由于CO₂具有特殊的物性和相特性，使得CO₂管道瞬态过程模拟难度较大，目前尚缺乏CO₂管道瞬态过程数值模拟软件的适应性评价。
方法选取OLGA与LedaFlow两款主流瞬态模拟软件建立CO₂瞬态泄漏数值仿真模型，并利用自行搭建的DN200高压CO₂管道泄漏实验装置，开展不同相态CO₂瞬态泄漏实验，从压力变化、温度变化、相特性等多个角度评价软件的适应性；以中国某长输CO₂管道为例，将该CO₂管道瞬态投产现场数据与软件模拟结果进行对比，从工程角度验证两款软件的适应性。
结果通过对比泄漏实验结果与软件模拟结果发现，对于两个设定的泄漏工况，OLGA软件泄漏压力计算的平均误差分别为15.3%、14.7%，而LedaFlow软件则为16.7%、18.0%，故OLGA软件与LedaFlow软件压力求解准确度相近。OLGA、LedaFlow软件分别存在低估、高估泄漏过程管内最低温度的情况，OLGA软件预测两个测点处最低温度的平均相对误差分别为21.2%、24.5%，而LedaFlow软件平均相对误差分别为13.1%、11.1%。对于某CO₂管道投产过程中的压力、温度，OLGA软件模拟的结果平均相对误差分别为1.2%、6.1%，而LedaFlow软件则分别为1.3%、5.2%，可见两款软件模拟结果与现场数据均较为接近。
结论在CO₂管道泄漏过程中，OLGA软件低估泄漏过程最低温度可保证管道低温安全性，且OLGA软件更适用于CO₂泄漏过程中管内压力、温度及相特性的预测；在CO₂管道投产过程中，OLGA、LedaFlow两款软件均适用于管内的压力、温度模拟研究。

Abstract:
Objective Transient processes like leakage and commissioning in CO₂ pipeline operation pose simulation challenges due to the unique physical properties and phase behavior of CO₂. Currently, there is a deficiency in adaptability evaluation of numerical simulation software for CO₂ pipeline transient processes.
Methods This study utilized two mainstream transient simulation software, OLGA and LedaFlow, to establish a numerical simulation model for transient CO₂ leakage. Testing was conducted on a self-built experimental setup for DN200 high-pressure CO₂ pipeline leakage across different phases, with software adaptability evaluated in terms of pressure, temperature and phase behavior. Furthermore, the adaptability of these software types was verified through a comparison of the simulation results with field data from transient commissioning of a long-distance CO₂ pipeline in China.
Results The comparison of the results from leakage test and software simulations revealed that under two specified leakage conditions, OLGA exhibited average pressure calculation errors of 15.3% and 14.7%, whereas LedaFlow exhibited errors of 16.7% and 18.0%. Consequently, the pressure calculation accuracy of OLGA closely aligns with that of LedaFlow. OLGA underestimated the lowest temperature in the pipe during leakage, with average relative errors of 21.2% and 24.5% at the two measuring points. In contrast, LedaFlow overestimated the lowest temperature with average relative errors of 13.1% and 11.1% at the two measuring points. During the commissioning of a CO₂ pipeline, OLGA exhibited average relative errors of 1.2% for pressure and 6.1% for temperature, whereas LedaFlow exhibited errors of 1.3% and 5.2% for the same parameters. The simulation results from both software packages closely align with the field data.
Conclusion In conclusion, in the process of CO₂ pipeline leakage, OLGA underestimates the lowest temperature during the leakage process, which can enhance the low-temperature safety of the pipeline. OLGA is better suited for predicting pressure, temperature and phase behavior during CO₂ leakage. Both OLGA and LedaFlow are suitable for simulation studies on pressure and temperature in CO₂ pipelines during commissioning.

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适用于超临界CO2管道瞬态过程模拟的软件评价

Adaptability evaluation of the software for transient process simulation of supercritical CO2 pipelines

适用于超临界CO₂管道瞬态过程模拟的软件评价

Adaptability evaluation of the software for transient process simulation of supercritical CO₂ pipelines