Multicomponent Effects on the Supercritical CO2 Systems: Mixture Critical Point and Phase Separation
Multicomponent Effects on the Supercritical CO2 Systems: Mixture Critical Point and Phase Separation
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多组分对超临界 CO2 系统的影响：混合物临界点和相分离
DOI：
10.1007/s10494-022-00335-9
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Yang, Suo
中科院分区：
文献类型：
--
作者：
Zhang, Hongyuan;Yi, Ping;Yang, Suo
半封闭式超临界CO_2(SCO_2)燃气轮机是一种很有前途的高效、几乎100%碳捕集的新一代动力循环。在这项研究中，研究了多组分对sCO2体系的影响。实现了一个基于汽液平衡(VLE)理论的真实流体模拟框架，用于预测计算流体力学(CFD)模拟中的相边界和真实混合物临界点，并捕捉相分离现象。开发了一种新的基于VLE的列表方法，使CFD求解器在计算上更容易负担得起。基于汽液平衡的热力学分析表明，少量与燃烧有关的杂质(如、、和)可以显著提高系统的混合临界点。因此，所谓的“超临界”系统可能处于发生相分离的亚临界两相区。在本研究的相关条件下(100-300bar)，相分离对混合物密度的影响很小，但对混合物的热容有相当大的影响。基于VLE的层流预混激波管的CFD模拟表明，膨胀波可以在系统中引发显著的凝结，凝结的潜热可以改变系统的温度和密度场。为了了解混合过程中的相分离现象，基于VLE的湍流横流大涡模拟(LES)结果表明，当两个亚临界气体或超临界类气体混合时，混合物可以部分凝结为亚临界液体相。压力越高、温度越低、浓度越高，体系中的相分离现象越明显。
Semi-closed supercritical CO2(sCO2) gas turbine is a promising candidate for the next generation power cycles with high efficiency and almost 100% carbon capture. In this study, the multicomponent effects on the sCO2systems are investigated. A real-fluid modeling framework based on the vapor-liquid equilibrium (VLE) theory is implemented to predict the phase boundary and real mixture critical point, and to capture the phase separation in computational fluid dynamics (CFD) simulations. A novel VLE-based tabulation method is developed to make the CFD solver computationally more affordable. VLE-based thermodynamic analyses show that a small amount of combustion-relevant impurities (e.g.,,, and) can significantly elevate the mixture critical point of thesystems. As a result, the so-called “supercritical”systems might be in the subcritical two-phase zone where phase separation occurs. At the relevant conditions in this study (100–300 bar), phase separation only has a small influence on themixture density, but has a considerable influence on the heat capacity of the mixture. VLE-based CFD simulation of a laminar premixedshock tube shows that expansion waves can trigger significant condensation in the systems and the latent heat of the condensation can change the temperature and density fields in the systems. To understand the phase separation during mixing, VLE-based large-eddy simulations (LES) of turbulent jet-in-crossflows in thesystems are conducted, and the results show that when two subcritical gas or supercritical gas-like streams mix, the mixture can partially condense to subcritical liquid phase. Higher pressure, lower temperature, and higherconcentration can enhance the phase separation phenomenon in the systems.
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影响因子：
2.8
作者：
J. Serrano;P. Piqueras;R. Navarro;D. Tarí;Cesare Maria Meano
通讯作者：
J. Serrano;P. Piqueras;R. Navarro;D. Tarí;Cesare Maria Meano
用于喷雾模拟的高压液滴模型
DOI：
10.1115/1.1915390
发表时间：
2006
影响因子：
1.5
作者：
C. Yan;S. Aggarwal
通讯作者：
S. Aggarwal
影响因子：
3.9
作者：
G. Ribert;X. Petit;P. Domingo
通讯作者：
P. Domingo
真实流体热物理模型：基于 OpenFOAM 的库，用于在高压下进行反应流动模拟
DOI：
10.1016/j.cpc.2021.108264
发表时间：
2021
期刊：
Comput. Phys. Commun.
影响因子：
--
作者：
Danh Nam Nguyễn;K. Jung;Jae Won Shim;C. Yoo
通讯作者：
C. Yoo
DOI：
10.1021/i160039a025
发表时间：
1971-08
期刊：
Industrial & Engineering Chemistry Fundamentals
影响因子：
--
作者：
R. W. Hanks;Avinash C. Gupta;J. J. Christensen-J.
通讯作者：
R. W. Hanks;Avinash C. Gupta;J. J. Christensen-J.