Abstract A high content of CO2 in natural gas reduces its heating value and causes operational problems. Hence, it must be removed in a cost-effective way. In this paper, the metastability concept was used to investigate the non-equilibrium condensation of CO2 in a supersonic nozzle using ANSYS CFX and RGP tables generated based on data from GERG-2008 equation of state. Once the simulation was completed, the pressure and temperature drops are analysed. It was found that the lowest pressure and temperature values correspond to the metastable region of CO2. Therefore, based on the simulation results it is concluded that non-equilibrium condensation of CO2 has been achieved in this study.

中文翻译：

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使用亚稳态方法对超音速喷嘴内的 CO2 非平衡冷凝进行 CFD 建模

摘要 天然气中高含量的 CO2 会降低其热值并导致操作问题。因此，必须以具有成本效益的方式将其移除。在本文中，使用基于 GERG-2008 状态方程数据生成的 ANSYS CFX 和 RGP 表，使用亚稳态概念来研究超音速喷嘴中 CO2 的非平衡冷凝。模拟完成后，将分析压力和温度下降。发现最低压力和温度值对应于 CO2 的亚稳态区域。因此，基于模拟结果得出结论，在本研究中已经实现了 CO2 的非平衡冷凝。