摘要
低温分离CO_2是捕获烟气中CO_2的有效方法之一,低温捕集法研究的首要问题是进行N_2-CO_2的相平衡计算。通过不同状态方程结合不同混合规则进行相平衡计算,结果显示在分析N_2/CO_2相平衡特性时PR状态方程结合Vdw混合规则的计算精度最高,N_2气相摩尔浓度计算结果与已有实验数据的最大偏差为5.15%,220 K时误差仅为0.43%。本文提出一种新型的液化再凝华低温分离系统并进行系统能耗分析,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。
CO2 cryogenic separation is a competitive method of capturing CO2 from flue gas, the primary task of cryogenic separation research is the N2-CO2 phase equilibrium calculation. N2-CO2 phase equilibrium calculation based on several state equation models are made in this article. The calculation results show that the PR state equation combined with Vdw mixture rule is most suitable for N2-CO2 phase equilibrium calculation, the maximum deviation of N2 vapor mole fraction is 5.15%, the average deviation is 0.43% at 220 K. We put forward a new kind of liquefaction combined sublimation separation system in low temperature, and made an energy consumption analysis about the new cryogenic system, the results show that the method combined liquefaction and sublimation achieved higher recovery and recycling purity, and the former method reduce energy consumption about 9% while compared with sublimation separation method.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2015年第9期1868-1873,共6页
Journal of Engineering Thermophysics
基金
江苏省六大人才高峰项目(No.2013-JNHB-014)
江苏省自然科学基金项目(重点研究专项)(No.BK2011017)
关键词
相平衡
状态方程
混合规则
能耗
phase equilibrium
equation of state
mixing rules
energy consumption
