气体杂质对CO_(2)物性和管输特性的影响

Impact of Gas Impurities on Physical Property and Pipeline Transportation Characteristics of CO_(2)

CO_(2)管道输送是CCUS(碳捕集、利用与封存)技术的重要环节。利用PR(Peng-Robinson)方程对管输不同相态纯CO_(2)物性参数进行了计算,并拟合了密度与温度、压力的相关经验公式;采用PR方程开展了含H_(2)S、H_(2)、CH_(4)、N_(2)、O_(2)等气体杂质CO_(2)多元体系物性、相特性计算。依托某油田CO_(2)管输示范工程,利用OLGA(全动态多相流模拟计算软件)和HYSYS(石油化工工艺流程模拟软件)计算分析了输送含有不同杂质种类和含量的CO_(2)气源对于增压功率、换热功率,管道沿程温降、压降,以及管输能力的影响。结果表明,杂质通过影响泡点线、露点线使两相区扩大,其中H_(2)和N_(2)扩大的区域最大;H_(2)、CH_(4)和H_(2)S会增大站场压缩机和换热器总功耗;杂质的添加将增大管道沿程温降和压降,其中H_(2)的影响最大;H_(2)S会略微增大管输能力,其他杂质均会降低管输能力。

CO_(2)pipeline transportation is an important link of carbon capture utilization and storage(CCUS)technology.The paper calculates the physical properties of pure CO_(2)in different phase states for pipeline transportation using the PR equation and fits empirical formulas related to density,temperature,and pressure.It calculates the physical and phase properties of CO_(2)multicomponent systems containing gas impurities such as H_(2)S,H_(2),CH_(4),N_(2),O_(2)via the equation and calculates&analyzes the effects of transporting CO_(2)gas sources with different types and contents of impurities on the boosting power,heat exchanger power,pipeline temperature drop,pressure drop,and pipeline transportation capacity through such software as OLGA and HYSYS based on a CO_(2)pipeline transportation demonstration project in an oilfield.The results indicate that impurities expand the two-phase region by affecting the bubble and dew point lines,with H_(2)and N_(2)having the largest expansion,H_(2),CH_(4),and H_(2)S will increase the total power consumption of station compressors and heat exchangers,the addition of impurities will increase the temperature drop and pressure drop along the pipeline,with H_(2)having the greatest impact,H_(2)S will slightly increase pipeline transportation capacity,while other impurities will reduce pipeline transportation capacity.