High-pressure supersonic carbon dioxide (CO2) separation benefiting carbon capture, utilisation and storage (CCUS) technology
High-pressure supersonic carbon dioxide (CO2) separation benefiting carbon capture, utilisation and storage (CCUS) technology
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DOI：
10.1016/j.apenergy.2023.120975
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发表时间：
2023-03-28
期刊：
影响因子：
11.2
通讯作者：
Yang, Yan
中科院分区：
文献类型：
--
作者：
Ding, Hongbing;Zhang, Yu;Yang, Yan
碳捕集、利用和封存（CCUS）对于构建绿色、有韧性的能源体系具有独特意义，也是应对气候挑战的关键解决方案。超音速脱碳的概念是非平衡冷凝和旋流分离的联合产物，可以以清洁的方式为CCUS技术做出贡献。本文基于真实的气体状态方程，建立并验证了高压环境下超声脱碳过程的数值模型。该模型与纯CO2模型和CH 4-CO2模型兼容。通过对超音速喷嘴和超音速分离器的模拟，对超音速脱碳技术的冷凝分离性能进行了评价。对于CO2的冷凝性能，结果表明，较高的压力使冷凝过程更容易实现。当压力为超临界时，入口温度的降低或入口CO2摩尔分数的增加导致较高的液体分数。对于分离性能，当入口非均质液滴质量浓度从0.1 kg/m3增加到7.5 kg/m3时，碳分离量从3.33 t/h增加到4.43 t/h，冷凝CO2的（火用）损失从436.57 kJ/kg下降到329.56 kJ/kg。结果表明，异核浓度越大，脱碳过程越容易，冷凝所需的火用越少。这一新概念有利于CCUS技术，可应用于海上天然气加工中的碳捕集。
Carbon capture, utilisation and storage (CCUS) is of unique significance for building a green and resilient energy system, and it is also a key solution to tackle the climate challenge. The concept of supersonic decarburization, a joint product of non-equilibrium condensation and swirling separation, can contribute to CCUS technology in a clean way. In this paper, a numerical model is established and validated to investigate the complex physical phenomena of supersonic decarbonization in a high-pressure environment based on the real gas equation of state. The model is compatible with the pure CO2 model and CH4-CO2 model. Through the simulation of the supersonic nozzle and supersonic separator, the condensation and separation performance of supersonic decarbonization technology was evaluated. For the condensation performance of carbon dioxide, the results show that higher pressure makes it much easier to achieve the condensation process. When the pressure is supercritical, the decrease of inlet temperature or the increase of inlet mole fraction of CO2 leads to a higher liquid fraction. For separation performance, when the mass concentration of inlet heterogeneous droplets increases from 0.1 kg/m3 to 7.5 kg/m3, the carbon separation amount increases from 3.33 ton/h to 4.43 ton/h, while the exergy loss of condensed CO2 drops from 436.57 kJ/kg to 329.56 kJ/kg. It demonstrates that the decarburization process is easier, and exergy required for condensation decreases when the concentration of the foreign core is larger. This new concept is beneficial to CCUS technology and can be applied to carbon capture in offshore natural gas processing.