Abstract
Natural gas hydrates, as a novel gas separation technology, hold significant promise for the separation of CO2 from flue gas. In this study, a comprehensive analysis integrating hydrate-based technology and membrane separation technology is conducted to establish a post-combustion CO2 capture process. The heat calculation of the hydrate unit in the separation process is performed based on experimental CO2/N2 hydrate separation data, leading to a heat value of 1,104,662 MJ/h for the formation and decomposition of hydrates. In the membrane separation unit, the mathematical model of hollow fiber membranes is employed to conduct an optimization process for the membrane area and inlet pressure. The optimization objectives focus on attaining a product gas with a CO2 concentration of 90 mol% and a CO2 recovery rate of 95%. As a result, the first-stage membrane area is determined to be 8000 m2 and the inlet pressure to be 1.45 MPa, while for the second-stage, the optimal values are found to be 5000 m2 for the membrane area and 2.00 MPa for the inlet pressure. Finally, following the optimization of the energy consumption throughout the entire process, a comprehensive analysis is carried out to assess the energy consumption and energy efficiency of the process. The findings reveal that the most significant energy losses in the process occur during the initial pressurization phase of the feed gas and the subsequent formation and decomposition stages of the hydrates. Additionally, the unit energy cost for CO2 capture is calculated to be 0.4416 kWh/kg CO2. In comparison to alternative post-combustion CO2 capture technologies, this process exhibits distinct advantages.
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Acknowledgement
This work was supported by Special project for marine economy development of Guangdong (six marine industries) (GDNRC [2022] 46), Key Research & Development Program of Guangzhou (No.202206050002, 202206050001).
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Xu, Z., Lang, X., Fan, S., Li, G., Wang, Y. (2024). Process Design of Hydrate-Membrane Coupled Separation for CO2 Capture from Flue Gas: Energy Efficiency Analysis and Optimization. In: Sun, B., Sun, J., Wang, Z., Chen, L., Chen, M. (eds) Proceedings of the Fifth International Technical Symposium on Deepwater Oil and Gas Engineering. DWOG-Hyd 2023. Lecture Notes in Civil Engineering, vol 472. Springer, Singapore. https://doi.org/10.1007/978-981-97-1309-7_34
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