超临界CO_(2)及其混合物在竖直圆管内的传热特性数值研究  

Numerical Study on Heat Transfer Characteristics of Supercritical CO_(2) and Its Mixture in Vertical Circular Tubes

作　　者：葛韶华 艾贵琳 杨帆[2] 陈昊楠 屈思雨 姜文全[1] Ge Shaohua;Ai Guilin;Yang Fan;Chen Haonan;Qu Siyu;Jiang Wenquan(School of Mechanical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China;College of Petrochemical Engineering,Liaoning Petrochemical University,Fushun Liaoning 113001,China)

机构地区：[1]辽宁石油化工大学机械工程学院,辽宁抚顺113001 [2]辽宁石油化工大学石油天然气工程学院,辽宁抚顺113001

出　　处：《辽宁石油化工大学学报》2023年第3期75-80,共6页Journal of Liaoning Petrochemical University

基　　金：辽宁省自然科学基金项目(20170540587);辽宁省教育厅科学研究经费项目(L2019024)。

摘　　要：碳捕捉、运输和储存(CCS)对实现碳中和具有重要意义。以超临界CO_(2)、超临界CO_(2)+CH_(4)混合物(CH_(4)摩尔分数分别为1%、3%、5%)及超临界CO_(2)+N_(2)混合物(N_(2)摩尔分数分别为1%、3%、5%)为工质,在工质质量流速为300~600 kg/(m^(2)‧s)、热流密度为80~100 kW/m^(2)、入口压力为8~10 MPa的条件下,研究了超临界CO_(2)及超临界CO_(2)混合物在竖直圆管内的流动换热过程。结果表明,随着工质中CH_(4)和N_(2)摩尔分数的降低,工质的换热系数峰值逐渐升高,且其对应的温度逐渐升高;工质的换热系数随着质量流速的增大而增大,且质量流速越大,换热系数变化幅度越大;随着入口压力的增大,工质的换热系数峰值有所降低,且其对应的温度逐渐升高;湍动能、浮升力及定压比热容与超临界CO_(2)及其混合物换热强化密切相关。Carbon capture,transport and storage(CCS)plays an important role in the process of carbon neutralization.The flow and heat transfer process of supercritical CO_(2) and supercritical CO_(2) mixture in a vertical circular tube was studied with supercritical CO_(2),supercritical CO_(2)+CH_(4) mixture(CH_(4) mole fraction is 1%,3%,5%)and supercritical CO_(2)+N_(2) mixture(N_(2) mole fraction is 1%,3%,5%)as working fluids at a mass flow rate of 300~600 kg/(m^(2)‧s),heat flow density of 80~100 kW/m^(2),and inlet pressure of 8~10 MPa.The results show that with the decrease of CH_(4) and N_(2) mole fraction in the working medium,the peak value of heat transfer coefficient of the working medium increases gradually,and its corresponding temperature increases gradually;the heat transfer coefficient of the working fluid increases with the increase of the mass flow rate,and the greater the mass flow rate,the greater the change range of the heat transfer coefficient;with the increase of inlet pressure,the peak value of heat transfer coefficient of working fluid decreases,and its corresponding temperature increases gradually.Turbulent kinetic energy,buoyancy and specific heat capacity at constant pressure are closely related to the heat transfer enhancement of supercritical CO_(2) and its mixture.

关 键 词：CCS CO_(2)混合物 换热 数值研究 

分 类 号：TE832[石油与天然气工程—油气储运工程] TK124[动力工程及工程热物理—工程热物理]