Phase equilibrium property analysis of N2/O2/CO2 based on several state equation models

LI Shuhong; LI Xianliang; YANG Wenchao; ZHANG Yongxin; ZHANG Xiaosong

doi:10.3969/j.issn.0438-1157.2014.z2.004

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Phase equilibrium property analysis of N₂/O₂/CO₂ based on several state equation models

更新时间：2025-12-10

- Phase equilibrium property analysis of N₂/O₂/CO₂ based on several state equation models
- CIESC Journal Issue z2, Pages: 25-32(2014)
- 作者机构：
  
  东南大学能源与环境学院,江苏,南京,210096
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0438-1157.2014.z2.004
  CLC： 652.6
- Online First：30 December 2014，
  
  Published：30 December 2014
- 稿件说明：
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LI Shuhong, LI Xianliang, YANG Wenchao, et al. Phase equilibrium property analysis of N₂/O₂/CO₂ based on several state equation models[J]. CIESC Journal, 2014, (z2): 25-32. DOI: 10.3969/j.issn.0438-1157.2014.z2.004.
DOI：

LI Shuhong, LI Xianliang, YANG Wenchao, et al. Phase equilibrium property analysis of N₂/O₂/CO₂ based on several state equation models[J]. CIESC Journal, 2014, (z2): 25-32. DOI: 10.3969/j.issn.0438-1157.2014.z2.004. DOI：

摘要

当前CO2捕获日益迫切

低温捕集CO2是其中的重要方法

而N2-CO2相平衡计算的准确程度关系到低温捕集中CO2的液化回收率以及回收纯度的分析

并影响系统形式的选择及能耗分析。通过不同状态方程及混合规则进行相平衡计算方法的对比选择

结果显示结合Vdw混合规则的PR状态方程计算N2/O2相平衡特性时精度最高

最大偏差为7.37%

平均偏差在3%左右

理想方程偏差最大;之后利用PR方程进行2 MPa压力下泡露点以及凝华温度的计算

并采用液化结合凝华的方法进行系统能耗分析

结果显示此方法能达到较高回收率及回收纯度

并与仅使用凝华方法分离相比

能耗降低9%以上;此外研究了O2对N2-CO2二元系统的相平衡特性的影响。

Abstract

CO2 capture is imperative currently

cryogenic separation is one of the important methods of CCS(carbon dioxide capture and storage). The accuracy of CO2-N2 phase equilibrium property is related to the liquefied CO2 recovery and recycling purity in cryogenic method

and it will affect the choice of the system and energy consumption analysis further. N2-CO2 phase equilibria calculation based on several state equation models were made in this article. The calculation results show that the PR state equation combined with Vdw mixing rules is most suitable for N2-CO2 phase equilibrium calculation

the maximum deviation is 7.37%

the average deviation is about 3%. Then the CO2 bubble point

dew point and the temperature of sublimation at the condition of 2 MPa with the PR equation model were calculated. An energy consumption analysis about cryogenic system was made

the results show that the method combined liquefaction and sublimation achieved higher recovery and recycling purity

and compared with sublimation separation method

the former method reduce energy consumption by more than 9%. At last

an analysis about the impact of O2 on the CO2-N2 phase equilibrium property was made.

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