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[1]张文辉　安国钰　熊小琴　李欣泽　邢晓凯.超临界CO2管道阀室放空方案设计[J].油气储运,2024,43(05):1-18.
　ZHANG Wenhui,AN Guoyu,XIONG Xiaoqin,et al.Design of venting scheme in block valve station for supercritical CO2 pipelines[J].Oil & Gas Storage and Transportation,2024,43(05):1-18.
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超临界CO2管道阀室放空方案设计

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年05期 页码: 1-18 栏目: 出版日期: 2024-05-25
Title:
Design of venting scheme in block valve station for supercritical CO2 pipelines
作者:
张文辉　安国钰　熊小琴　李欣泽　邢晓凯
Author(s):
ZHANG Wenhui;  AN Guoyu;  XIONG Xiaoqin;  XING Xiaokai
关键词:
超临界CO2; 管道输送; 阀室放空; 间歇放空
Keywords:
supercritical CO2;  pipeline ; transportation;  venting of ; block valve station;  intermittent venting
分类号:
TE832
文献标志码:
A
摘要:
【目的】超临界CO2管输是解决“CCUS（Carbon Capture, Utilization and Storage）”技术中碳源汇不匹配问题的最经济的方式。当管道因维检修需要进行放空作业时，由于相变及焦汤效应的影响，放空管段温度可能低于－20 ℃，诱发管道脆断。【方法】利用OLGA软件建立超临界CO2管道放空模型，将模拟结果与实验数据对比，发现OLGA软件在预测CO2相变、温降及压降方面具有较高的准确性。在此基础上，提出间歇放空方案，并模拟分析了不同初始压力及温度下放空阀开度对放空过程及关阀回温过程时长的影响。【结果】在整个干线管道放空段中，放空点是最危险点，其温度会率先降至－20 ℃。随着阀门开度的减小，放空点到－20 ℃所需时间呈指数规律增长。放空阀开度越小，一次开阀放空总量越大，但平均放空速率越小，放空时间成本越高。放空阀开度过大，一次开阀放空总量减小，且干线管道放空段整体压力水平高，也会使将管内介质完全放空至大气压力所需时间增加。关闭放空阀后，管内介质回温可分为由轴向传热或径向传热主导的两个阶段，且轴向传热主导阶段的温升速率更大。随着阀门开度的增加，关阀回温时长会迅速增加并趋于稳定。【结论】放空阀开度过大或过小均会导致放空时间过长，工程应用中可以将放空点处的温度或压力与放空阀的动作连锁，但是为保证控制的可靠性并尽可能缩短总的放空时长，需要合理确定放空阀每次动作的开度。
Abstract:
【Purpose】Under the dual carbon background, "CCUS" technology has become an important component of China's carbon neutrality technology. Supercritical CO2 pipeline transportation is the most economical way to solve the problem of carbon source sink mismatch in "CCUS" technology. When the pipeline needs to be emptied for maintenance, the temperature of the venting section may be lower than -20 ℃ due to phase change and J-T effect, causing the steel pipe to become brittle. 【Method】A supercritical CO2 pipeline venting model was established using OLGA software, and the simulation results were compared with experimental data. It was found that OLGA software has high accuracy in predicting CO2 phase transition, temperature drop, and pressure drop. On this basis, a method of intermittent venting was proposed, and the effects of different initial pressures and temperatures on the opening of the venting valve on the venting process, the duration of the valve closing and reheating process, as well as the temperature and pressure distribution of the venting pipe section were simulated and analyzed. 【Results】In the entire venting section, the venting point is the most dangerous, and its temperature will first drop to -20 ℃. As the valve opening decreases, the time required for the vent point to reach -20 ℃ increases exponentially. The smaller the opening of the vent valve, the greater the total amount during a venting, but the lower the average venting rate, the higher the cost of venting time. If the vent valve is opened too large, the total amount during a venting will decrease, and the pressure level distributing in the venting section can be high, which also increase the time releasing the pressure of medium inside the pipe completely to atmospheric pressure. After closing the valve, the possession of temperature increase inside the pipe is divided into two stages dominated by axial heat transfer and radial heat transfer, respectively, and the temperature rise rate is higher in the axial heat transfer dominated stage. With the increase of the opening, the duration of this possession rapidly increase and tend to stabilize. However, the opening is too small, the temperature level overall the pipeline will be too low at the end of the reheating process, causing the allowable temperature drop during the next venting process is small. 【Conclusion】Opening the vent valve too large or too small can lead to a long vent time. In engineering applications, the temperature or pressure of the vent point is linked to the action of the vent valve. However, to ensure control reliability and minimize the total vent time, it is necessary to reasonably determine the opening of each action of the vent valve. The determination of the opening requires a comprehensive consideration of the average vent rate when the temperature reaches -20 ℃ of vent point and the overall pressure level of the pipeline. It also requires a comprehensive consideration of the duration of reheating process, as well as the temperature level of the main pipeline after the reheating process is completed.

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更新日期/Last Update: 2024-03-25