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[1]柳歆　王海锋　杨腾　胡其会　殷布泽　李玉星　朱建鲁　朱振宇.高压CO2管道放空模拟及安全泄放[J].油气储运,2024,43(04):1-14.
　Liu Xin,Wang Haifeng,Yang Teng,et al.Simulation and safe discharge of high-pressure CO2 pipeline[J].Oil & Gas Storage and Transportation,2024,43(04):1-14.
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高压CO2管道放空模拟及安全泄放

《油气储运》[ISSN:1000-8241/CN:13-1093/TE] 卷: 43 期数: 2024年04期 页码: 1-14 栏目: 出版日期: 2024-04-25
Title:
Simulation and safe discharge of high-pressure CO2 pipeline
作者:
柳歆　王海锋　杨腾　胡其会　殷布泽　李玉星　朱建鲁　朱振宇
Author(s):
Liu Xin;  Wang Haifeng;  Yang Teng;  Hu Qihui;  Yin Buze;  LI Yuxing;  ZHU Jianlu;  ZHU Zhenyu
关键词:
CCUS; CO2管道; 放空模拟; 安全泄放
Keywords:
CCUS;  Carbon Dioxide pipeline;  venting simulation;  safe venting
分类号:
TE832
文献标志码:
A
摘要:
【目的】碳捕集、利用与封存（CCUS）是实现碳中和不可缺少的关键技术，CO2管道输送是CCUS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，主管和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】首先利用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，模拟分析了不同阀门开度、不同初始温度、不同初始压力对CO2管道放空过程管内低温、相态变化和放空时间的影响。【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，研究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，生成干冰的可能性越大。【结论】因此，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减小放空阀阀门开度，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和防护。
Abstract:
Carbon capture, utilization, and storage (CCUS) is an essential key technology for achieving carbon neutrality, and CO2 pipeline transportation is an important part of CCUS technology. During the transportation process of supercritical CO2 pipelines, when there is a leakage or venting operation in the pipeline, due to the strong throttling effect of CO2, local low temperatures may occur in the main pipe and venting pipe, generating dry ice to block the pipeline and making the steel pipe brittle. Firstly, a high-pressure CO2 pipeline release model was established using OLGA software, and the simulation results were compared with foreign experimental data. It was found that OLGA software is more accurate in calculating pressure drop and relatively conservative in calculating temperature drop, and can be used for CO2 pipeline design and calculation. On this basis, a long-distance high-pressure CO2 pipeline venting model was established, and the effects of different valve openings, initial temperatures, and initial pressures on the low temperature, phase changes, and venting time inside the CO2 pipeline venting process were simulated and analyzed. The simulation results show that reducing the opening of the vent valve can prevent the temperature inside the pipe from being too low during the venting process. Under the venting simulation conditions in this article, the opening of the valve that does not generate dry ice (-56.6 ℃) should be 13.5%, and the opening of the valve when the temperature inside the pipe is not lower than -30 ℃ should be below 4.5%; During the venting process of high-pressure CO2 pipelines, the convective heat transfer intensity is low and the temperature drop amplitude is large when the distance from the discharge outlet is relatively far; The initial temperature has a significant impact on the temperature inside the pipe during the venting process. The lower the initial temperature, the lower the temperature inside the pipe during the venting process, and the greater the possibility of generating dry ice. Therefore, in practical engineering, special attention should be paid to the fluid temperature inside the main pipeline far from the discharge end, and during the venting process, the opening of the venting valve should be automatically controlled to reduce the temperature drop in the pipeline, slowing down the temperature drop rate during the venting process. For the venting of low-temperature dense phase CO2 pipelines, special attention and protection should be paid.

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备注/Memo


更新日期/Last Update: 2024-01-09