N_2/O_2/Ar对CO_2混合物相平衡及密度特性影响分析  

Effect Analysis of N_2/O_2/Ar on CO_2 Phase Equilibrium and Density Characteristics

作　　者：单贵苏 杜垲[1] SHAN Guisu;DU Kai(School of Energy and Environment, Southeast University)

机构地区：[1]东南大学能源与环境学院

出　　处：《建筑热能通风空调》2019年第4期35-39,共5页Building Energy & Environment

摘　　要：低温相变分离中,CO_2相平衡及密度特性会受到N_2/O_2/Ar杂质组分的影响。本文采用立方型状态方程PR(Peng-Robinson),SRK(Redlich-Kong-Soave),多参数状态方程BWRS(Benedict-Webb-Rubin-Starling)对CO_2/N_2、CO_2/O_2、CO_2/Ar三组二元组分进行模拟,发现PR方程对三组二元组分的泡露点特性模拟较好,BWRS方程对高压下CO_2混合物的密度特性模拟较好。N_2、O_2与Ar的存在使CO_2泡/露点发生变化,使密度减小,且随着N_2/O_2/Ar杂质摩尔分数的增大,CO_2混合物的相包络线空间进一步增大,密度进一步减小。During the process of cryogenic phase change separation, the presence of impurities can affect the CO2 phase equilibrium and density characteristics. In this paper, three groups of CO2/N2, CO2/O2, CO2/Ar were calculated using PR EOS(Peng-Robinson equation of state), SRK EOS(Redlich-Kong-Soave equation of state) and BWRS EOS(Benedict-Webb-Rubin-Starling equation of state). It is found that the PR equation simulates the bubble and dew point characteristics of three working fluid pairs better and the BWRS equation simulates the density characteristics of CO2 mixtures better under high pressure. The presence of N2, O2 and Ar makes the bubble and dew point vary, and with the increase of N2/O2/Ar molar fraction, the phase envelope of CO2 mixture further increases.

关 键 词：状态方程 相平衡 混合物 低温分离 

分 类 号：O642.42[理学—物理化学]