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[1]柳歆,王海锋,杨腾,等.高压CO2管道放空及安全泄放的数值模拟[J].油气储运,2024,43(04):387-394.[doi:10.6047/j.issn.1000-8241.2024.04.003]
LIU Xin,WANG Haifeng,YANG Teng,et al.Numerical simulation of high-pressure CO2 pipeline venting and safe release[J].Oil & Gas Storage and Transportation,2024,43(04):387-394.[doi:10.6047/j.issn.1000-8241.2024.04.003]
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LIU Xin,WANG Haifeng,YANG Teng,et al.Numerical simulation of high-pressure CO2 pipeline venting and safe release[J].Oil & Gas Storage and Transportation,2024,43(04):387-394.[doi:10.6047/j.issn.1000-8241.2024.04.003]
高压CO2管道放空及安全泄放的数值模拟
《油气储运》[ISSN:1000-8241/CN:13-1093/TE]
卷:
43
期数:
2024年04期
页码:
387-394
栏目:
低碳与新能源
出版日期:
2024-04-25
- Title:
-
Numerical simulation of high-pressure CO
2 pipeline venting and safe release
- 文章编号:
- 1000-8241（2024）04-0387-08
- Keywords:
- CO2 pipeline; CCUS; venting simulation; safety relief
- 分类号:
- TE832
- 文献标志码:
- A
- 摘要:
- 【目的】碳捕集、利用与封存是实现碳中和不可缺少的关键技术，CO2管道输送是碳捕集、利用与封存技术的重要一环。超临界CO2管道输送过程中，当管道发生泄漏或进行放空作业时，因CO2强节流效应，主管及放空管内可能出现局部低温，生成干冰堵塞管道，并使钢管变脆。【方法】利用OLGA软件建立高压CO2管道泄放模型，并将模拟结果与国外实验数据进行对比，发现OLGA软件在计算压降方面较准确，在计算温降方面相对保守，可用于CO2管道设计计算。在此基础上，建立了长距离高压CO2管道放空模型，模拟分析了不同的阀门开度、初始温度及初始压力对CO2管道放空过程中管内低温、相态变化及放空时间的影响。【结果】减小放空阀阀门开度可以防止放空过程中管内温度过低，在选定的放空模拟条件下，不生成干冰的阀门开度应在13.5％，管内温度不低于-30℃时的阀门开度应在4.5％以下；高压CO2管道放空过程中，距离泄放口较远处，对流换热强度小、温降幅度较大；初始温度对于放空过程管内温度影响较大，初始温度越低，放空过程中管内温度越低，生成干冰的可能性也越大。【结论】在实际工程中应重点关注主管道上距离泄放端较远处管内流体温度，并在放空过程中根据管内温降情况自动控制放空阀阀门开度，减缓放空过程温降速率，对低温密相CO2管道放空需重点关注与防护。（图9，表3，参25）
- Abstract:
- [Objective] Carbon capture, utilization and storage (CCUS) is an indispensable technology for achieving carbon neutrality, and CO2 pipeline transmission is a significant component of this technology. In the process of supercritical CO2 pipeline transmission, unintentional pipeline leakage or venting operations may cause localized low temperatures in the trunk pipelines and vent piping due to the strong throttling effect caused by CO2, resulting in dry ice that blocks the pipeline and makes it brittle. [Methods] In the study, the OLGA software was utilized to develop a high-pressure CO2 pipeline relief model. The simulation results obtained from the model were then compared against foreign experimental data. The comparative analysis indicated that the OLGA software provided relatively accurate calculations for pressure drop and tended to be more conservative in calculating temperature drop. These findings supported the software’s suitability for performing calculations related to the design of CO2 pipelines. Building upon this foundation, a long-distance high-pressure CO2 pipeline venting model was established to simulate and analyze the effects of different valve openings, initial temperatures, and initial pressures on temperature decrease, phase state changes, and venting duration during the CO2 pipeline venting process. [Results] It was revealed that reducing the vent valve opening effectively prevented excessively low temperatures within the pipeline during venting. Under the venting simulation conditions selected for this study, 13.5% valve opening effectively prevented dry ice formation, and the valve opening below 4.5% could maintain the pipeline temperature at higher than -30 °C. The venting process of the high-pressure CO2 pipeline exhibited low convective heat transfer intensity and significant temperature drops, predominantly observed away from the relief port. The initial temperature had a substantial impact on the temperature in the pipeline during venting. More specifically, a lower initial temperature resulted in a decrease in the temperature in the pipeline during venting, increasing the likelihood of dry ice formation. [Conclusion] Therefore, in engineering practice, it is crucial to focus on fluid temperature in sections far from the relief port along the trunk pipelines and automatically reduce the vent valve opening in response to temperature drops, aiming to slow down the temperature drop rate during the venting process. Special attention should be paid to protecting CO2 pipelines, especially when operating under low-temperature dense phase conditions. (9 Figures, 3 Tables, 25 References)
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备注/Memo
柳歆，女，1983年生，高级工程师，2011年博士毕业于中国石油大学（北京）油气储运工程专业，现主要从事海底管道流动保障安全的研究工作。地址：北京市朝阳区太阳宫南街6号院海油大厦B座，100028。电话：010-84526760。Email：liuxin8@cnooc.com.cn
基金项目：中海石油（中国）有限公司“十四五”科技项目“海上CCUS上下游一体化技术研究”，KJGG-2022-12-CCUS-0103。
· Received: 2023-09-26 · Revised: 2023-11-15 · Online: 2024-01-09
更新日期/Last Update:
2024-04-25