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Optimization and control for CO2 compression and purification unit in oxy-combustion power plants

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  • Jin, Bo
  • Zhao, Haibo
  • Zheng, Chuguang

Abstract

High CO2 purity products can be obtained from oxy-combustion power plants through a CO2 CPU (compression and purification unit) based on phase separation method. To ensure that CPU (with double flash separators) can be operated under optimal conditions, this paper focuses on single variable analysis, multi-variable optimization, dynamic simulation and control system design for CPU in oxy-combustion power plants. It is found that optimal operating conditions are 30 bar, 30.42 °C, −24.64 °C, and −55 °C for multi-stage CO2 compressor discharge pressure, flue gas temperature after compression, first flash separator temperature, and second flash separator temperature, respectively. The designed double temperature control structure based on a systematic top-down analysis and bottom-up design method is more suitable than the single temperature control structure under different operating scenarios (load change and flue gas composition ramp change). To bear operating disturbances, operating strategies like elevating temperature, manipulating valves and adjusting setpoints are proposed. Influence of SOx would be more obvious than that of NOx, whilst the kij mixing parameters in Peng–Robinson property method affects little on process optimization and control system design. Comprehensive dynamic model with specified control system provides possibility to integrate CPU with full-train oxy-combustion power plants.

Suggested Citation

  • Jin, Bo & Zhao, Haibo & Zheng, Chuguang, 2015. "Optimization and control for CO2 compression and purification unit in oxy-combustion power plants," Energy, Elsevier, vol. 83(C), pages 416-430.
    • Handle: RePEc:eee:energy:v:83:y:2015:i:c:p:416-430
    DOI: 10.1016/j.energy.2015.02.039
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    References listed on IDEAS

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    1. Liu, Hao & Shao, Yingjuan, 2010. "Predictions of the impurities in the CO2 stream of an oxy-coal combustion plant," Applied Energy, Elsevier, vol. 87(10), pages 3162-3170, October.
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    4. Igor Donskoy, 2023. "Techno-Economic Efficiency Estimation of Promising Integrated Oxyfuel Gasification Combined-Cycle Power Plants with Carbon Capture," Clean Technol., MDPI, vol. 5(1), pages 1-18, February.
    5. Koohestanian, Esmaeil & Sadeghi, Jafar & Mohebbi-Kalhori, Davod & Shahraki, Farhad & Samimi, Abdolreza, 2018. "A novel process for CO2 capture from the flue gases to produce urea and ammonia," Energy, Elsevier, vol. 144(C), pages 279-285.
    6. Kim, Taewoo & Park, So Dam & Lee, Uen Do & Park, Byeong Cheol & Park, Kyoung Il & Hong, Jongsup, 2021. "Thermodynamic analysis of the 2nd generation pressurized fluidized-bed combustion cycle utilizing an oxy-coal boiler and a gasifier," Energy, Elsevier, vol. 236(C).
    7. Zhang, Yongliang & Jin, Bo & Zou, Xixian & Zhao, Haibo, 2016. "A clean coal utilization technology based on coal pyrolysis and chemical looping with oxygen uncoupling: Principle and experimental validation," Energy, Elsevier, vol. 98(C), pages 181-189.
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    9. Moon, Ji-Hong & Jo, Sung-Ho & Park, Sung Jin & Khoi, Nguyen Hoang & Seo, Myung Won & Ra, Ho Won & Yoon, Sang-Jun & Yoon, Sung-Min & Lee, Jae-Goo & Mun, Tae-Young, 2019. "Carbon dioxide purity and combustion characteristics of oxy firing compared to air firing in a pilot-scale circulating fluidized bed," Energy, Elsevier, vol. 166(C), pages 183-192.
    10. Costa, Alexis & Coppitters, Diederik & Dubois, Lionel & Contino, Francesco & Thomas, Diane & De Weireld, Guy, 2024. "Energy, exergy, economic and environmental (4E) analysis of a cryogenic carbon purification unit with membrane for oxyfuel cement plant flue gas," Applied Energy, Elsevier, vol. 357(C).
    11. Habib, Mohamed A. & Salaudeen, Shakirudeen A. & Nemitallah, Medhat A. & Ben-Mansour, R. & Mokheimer, Esmail M.A., 2016. "Numerical investigation of syngas oxy-combustion inside a LSCF-6428 oxygen transport membrane reactor," Energy, Elsevier, vol. 96(C), pages 654-665.
    12. Jin, Bo & Zhao, Haibo & Zheng, Chuguang & Liang, Zhiwu, 2018. "Control optimization to achieve energy-efficient operation of the air separation unit in oxy-fuel combustion power plants," Energy, Elsevier, vol. 152(C), pages 313-321.
    13. Wawrzyńczak, Dariusz & Panowski, Marcin & Majchrzak-Kucęba, Izabela, 2019. "Possibilities of CO2 purification coming from oxy-combustion for enhanced oil recovery and storage purposes by adsorption method on activated carbon," Energy, Elsevier, vol. 180(C), pages 787-796.
    14. Zhao, Zhigang & Su, Sheng & Si, Ningning & Hu, Song & Wang, Yi & Xu, Jun & Jiang, Long & Chen, Gang & Xiang, Jun, 2017. "Exergy analysis of the turbine system in a 1000 MW double reheat ultra-supercritical power plant," Energy, Elsevier, vol. 119(C), pages 540-548.
    15. Wu, Hai-bo & Xu, Ming-xin & Li, Yan-bing & Wu, Jin-hua & Shen, Jian-chong & Liao, Haiyan, 2020. "Experimental research on the process of compression and purification of CO2 in oxy-fuel combustion," Applied Energy, Elsevier, vol. 259(C).

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