含杂质超临界CO_(2)管道放空对管内温压变化的影响实验  

Experimental study on the influence of venting on temperature and pressure changes in impurity-containing supercritical CO_(2) pipeline

作　　者：胡其会[1] 杨腾 苗青 列斯别克·塔拉甫别克 李兆兰 范振宁[3] HU Qihui;YANG Teng;MIAO Qing;Liesibieke·TALAFUBIEKE;LI Zhaolan;FAN Zhenning(College of Pipeline and Civil Engineering,China University of Petroleum(East China)/Shandong Key Laboratory of Oil&Gas Storage and Transportation Safety;PipeChina Institute of Science and Technology;Sinopec Petroleum Engineering Design Company)

机构地区：[1]中国石油大学(华东)储运与建筑工程学院·山东省油气储运安全重点实验室,山东省青岛市266580 [2]国家管网集团科学技术研究总院分公司 [3]中石化石油工程设计有限公司

出　　处：《油气储运》2024年第9期985-994,共10页Oil & Gas Storage and Transportation

基　　金：国家重点研发计划“战略性科技创新合作”专项“区域二氧化碳捕集与封存关键技术研发与示范”,2022YFE0206800;国家石油天然气管网集团有限公司重大科技攻关课题“超临界CO_(2)管道输送工艺与安全技术研究”,GWHT20220011708。

摘　　要：【目的】管输CO_(2)不可避免含有杂质,杂质的存在会对超临界CO_(2)管道放空过程管内介质温降、压降、相态变化等产生重要影响,但目前针对大管径工业规模级别的超临界CO_(2)管道放空实验研究较为欠缺。【方法】设计了一套含杂质超临界CO_(2)管道节流放空实验装置,研究不同含量的CH_(4)或N_(2)杂质对超临界CO_(2)管道放空过程中主管道和放空管道内温降、压降及相态变化的影响,得到含杂质超临界CO_(2)管道放空主管道内流体相态变化趋势图。【结果】含杂质超临界CO_(2)管道放空,杂质的混入会显著影响管内CO_(2)的充装质量和放空时间,且杂质N2的混入能一定程度上提高放空管道CO_(2)节流后温度;混入杂质CH或N,均能明显提升放空过程主管道内流体的最低温度,缩小管内流体径向温差,且混入杂质越多,管内流体最低温度越高,径向温差越小;纯CO_(2)、杂质摩尔分数为1%的CO_(2)管道与杂质摩尔分数为3%的CO_(2)管道放空过程中主管道内最低温度位置呈相反规律,纯CO_(2)、杂质摩尔分数为1%的CO_(2)管道放空过程中距离放空管道最远处管内温度最低,而杂质摩尔分数为3%的CO,管道放空过程中管内最低温度则出现在距离放空管道最近处。【结论】研究成果可为含杂质超临界CO_(2)管道放空系统设计、放空过程干冰预防、管材保护提供参考。[Objective]Impurities are inevitably present in CO_(2)transmitted through pipelines,and these substances have significant impacts on the venting process of supercritical CO_(2)pipelines,including temperature reductions,pressure drops,and phase changes of the medium inside the pipeline.However,experimental research on the venting of large-diameter industrial-scale supercritical CO2 pipelines remains deficient.[Methods]Utilizing a specially designed experimental setup for throttling and venting impurity-containing supercritical CO_(2)pipelines,a study was conducted to delve into the influences of different contents of CH_(4)or N_(2)on temperature reductions,pressure drops,and phase changes in both the main pipeline and vent piping of the supercritical CO_(2)pipeline during the venting process.Furthermore,the phase changes of fluid in the main pipeline of the impurity-containing supercritical CO_(2)pipeline during venting were summarized into trend charts.[Results]During the venting process of the impurity-containing supercritical CO_(2)pipeline,the mixed impurities significantly affected both the CO_(2)flling quality and the duration of venting.Moreover,the mixed N caused a temperature increase of CO_(2)after throttling in the venting piping.The mixed CH_(4)or N_(2)led to an apparent increase in the minimum temperature of the fluid in the main pipeline during venting,while reducing the radial temperature difference of the fluid in the pipeline.With higher contents of impurities mixed,the minimum temperature of the fuid in the pipeline rose while the radial temperature difference decreased.The positions of the minimum temperature in the main pipeline during venting showed contrasting patterns among the scenarios involving pure CO_(2),impurities at an amount fraction of 1%,and impurities at an amount fraction of 3%.Specifically,during the CO_(2) pipeline venting,the minimum temperature occurred at the position farthest from the vent piping in the scenarios of pure CO_(2) and impurities at an amount fraction of 1%.Con

关 键 词：CCUS 超临界 二氧化碳管道 杂质 相态变化 放空 

分 类 号：TE832[石油与天然气工程—油气储运工程]