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Post‐combustion CO 2 capture: chemical absorption processes in coal‐fired steam power plants

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  • Jochen Oexmann
  • Alfons Kather
  • Sebastian Linnenberg
  • Ulrich Liebenthal

Abstract

The integration of a post‐combustion CO 2 capture unit in a coal‐fired steam power plant leads to a reduction in net power output, where the largest contributors to the power loss are the heat requirement for the regeneration of the chemical solvent in the desorber of the CO 2 capture unit (approx. 2/3) and the auxiliary power demand of the CO 2 compressor (approx. 1/4). In this review, the layout of the overall process is explained and the interaction of the three sub‐processes power plant, CO 2 capture process and CO 2 compressor is discussed. The optimization of process parameters of the CO 2 capture unit – such as solution flow rate and reboiler temperature – is intricate due to the complex interaction of the sub‐processes. It is shown that although the heat requirement for solvent regeneration has the largest impact on the power output of the overall process, the optimal process parameters that lead to the lowest possible heat requirement of the capture unit do not necessarily coincide with the optimal process parameters that make for the most energy efficient operation of the overall process. Therefore, when optimizing process parameters of CO 2 absorption processes in power plants, one should focus on the minimization of the overall power loss instead of solely reducing the heat requirement for solvent regeneration. The described coherences are illustrated by the results of process simulations based on detailed models of a post‐combustion CO 2 capture unit using 7 m (30 wt.‐%) monoethanolamine (MEA), of a supercritical, hard‐coal‐fired steam power plant and of a six‐stage, intercooled CO 2 compressor. © 2012 Society of Chemical Industry and John Wiley & Sons, Ltd

Suggested Citation

  • Jochen Oexmann & Alfons Kather & Sebastian Linnenberg & Ulrich Liebenthal, 2012. "Post‐combustion CO 2 capture: chemical absorption processes in coal‐fired steam power plants," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 2(2), pages 80-98, April.
  • Handle: RePEc:wly:greenh:v:2:y:2012:i:2:p:80-98
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    1. Wang, Tao & Yu, Wei & Le Moullec, Yann & Liu, Fei & Xiong, Yili & He, Hui & Lu, Jiahui & Hsu, Emily & Fang, Mengxiang & Luo, Zhongyang, 2017. "Solvent regeneration by novel direct non-aqueous gas stripping process for post-combustion CO2 capture," Applied Energy, Elsevier, vol. 205(C), pages 23-32.
    2. Fontina Petrakopoulou & Diego Iribarren & Javier Dufour, 2015. "Life‐cycle performance of natural gas power plants with pre‐combustion CO2 capture," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 5(3), pages 268-276, June.
    3. Fu, Yue & Wang, Liyuan & Liu, Ming & Wang, Jinshi & Yan, Junjie, 2023. "Performance analysis of coal-fired power plants integrated with carbon capture system under load-cycling operation conditions," Energy, Elsevier, vol. 276(C).
    4. Hwang, Junhyeok & Kim, Jeongnam & Lee, Hee Won & Na, Jonggeol & Ahn, Byoung Sung & Lee, Sang Deuk & Kim, Hoon Sik & Lee, Hyunjoo & Lee, Ung, 2019. "An experimental based optimization of a novel water lean amine solvent for post combustion CO2 capture process," Applied Energy, Elsevier, vol. 248(C), pages 174-184.
    5. Hornbostel, K. & Nguyen, D. & Bourcier, W. & Knipe, J. & Worthington, M. & McCoy, S. & Stolaroff, J., 2019. "Packed and fluidized bed absorber modeling for carbon capture with micro-encapsulated sodium carbonate solution," Applied Energy, Elsevier, vol. 235(C), pages 1192-1204.
    6. Chenbin Ma & Wenzhao Zhang & Yu Zheng & Aimin An, 2021. "Economic Model Predictive Control for Post-Combustion CO 2 Capture System Based on MEA," Energies, MDPI, vol. 14(23), pages 1-15, December.
    7. Hosseini-Ardali, Seyed Mohsen & Hazrati-Kalbibaki, Majid & Fattahi, Moslem & Lezsovits, Ferenc, 2020. "Multi-objective optimization of post combustion CO2 capture using methyldiethanolamine (MDEA) and piperazine (PZ) bi-solvent," Energy, Elsevier, vol. 211(C).
    8. Yanchi Jiang & Zhongxiao Zhang & Haojie Fan & Junjie Fan & Haiquan An, 2018. "Experimental study on hybrid MS†CA system for post†combustion CO2 capture," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 8(2), pages 379-392, April.

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