摘要
CO 2输送是整个CCUS技术中重要的中间环节,而管道输送则是超临界CO 2最高效和最经济的输送方式。为了研究超临界CO 2泄压过程中管内节点温度、压力和相态的变化,针对管道泄漏工况,利用OLGA软件对不同初始压力、温度和流量对泄放过程中管段内不同节点的温度、压力等参数和CO 2的相态变化的影响进行模拟和分析。分析结果表明:泄漏发生时,输送压力越低,管道泄漏口处的温度越低,应在设计时考虑管道的耐低温能力;初始输送温度对管输压降和流量变化影响不大,主要影响管内温度,进而影响CO 2的相态变化。初始温度过高,CO 2易在泄漏过程中转为气态,对管道造成冲击;初始温度过低,管道温降加快,更易产生干冰,两种情况均会对管道造成损伤。针对超临界CO 2管道输送系统,应考虑泄漏过程中减压波的传递对泄漏口裂纹扩展的影响。所得结果可为我国CCUS技术的发展提供理论支持。
CO 2 transportation is an important intermediate link in the entire CCUS technology,while pipeline transportation is the most efficient and economical way for supercritical CO 2.To study the changes in the temperature,pressure and phase state of the nodes in the pipeline during the supercritical CO 2 pressure relief process,for the leakage conditions of the pipeline,the OLGA software was used to simulate and analyze effects of the initial pressure,temperature and flow rate on temperature,pressure and the phase change of CO 2 of different nodes in the pipe section during the relief process.The analyses results show that:when the leakage occurs,the lower the delivery pressure,the lower the temperature at the pipeline leakage port.The low thermal resistance of the pipeline should be considered in the pipeline design.The initial delivery temperature has little effect on the pipeline pressure drop and flow change,and mainly affects the temperature in the pipeline,which in turn affects the phase change of CO 2.If the initial temperature is too high,CO 2 will easily change to gaseous state during the leakage process,which will impact the pipeline.While the initial temperature is too low,the temperature drop of the pipeline will be accelerated,and dry ice will be more likely to occur.Both too high and too low cases will cause damage to the pipeline.For the supercritical CO 2 pipeline transportation system,the influence of the transmission of the reduced pressure wave on the crack propagation of the leakage port should be considered.The study can provide theoretical support for the domestic development of CCUS technology.
作者
陈兵
徐源
白世星
Chen Bing;Xu Yuan;Bai Shixing(Mechanical Engineering College,Xi’an Shiyou University)
出处
《石油机械》
北大核心
2020年第8期136-142,共7页
China Petroleum Machinery
基金
西安石油大学横向科研项目“延长油田液态CO 2管道输送可行性研究”(ycsy2015ky-B-02)。
关键词
管道输送
超临界CO
2
瞬变特性
泄压
放空
泄漏口
pipeline transportation
supercritical CO 2
transient characteristics
pressure relief
venting
leakage port
