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Control optimization to achieve energy-efficient operation of the air separation unit in oxy-fuel combustion power plants

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

Abstract

Cryogenic air separation unit (ASU) is considered as the currently available commercial oxygen production method for oxy-fuel combustion power plants; however, this method leads to significant energy penalty and economic cost. Real-time optimizing system operations during dynamic processes (such as flow rate change, oxygen product purity change, and flexible operation) are expected to achieve remarkable energy savings. Dynamic exergy provides a powerful indicator for real-time evaluating the system thermodynamic performance and quantifying the impact of a control strategy. In this work, some important transient exergy parameters of ASU systems under typical dynamic operating scenarios were first obtained through combining steady-state and dynamic process simulations. Next, control penalty and cost for internal control structures (layers and loops) were determined for the optimizations of control strategy and operation. Feedforward-feedback control structure and ASU-following control strategy are more suitable for ASU regulation and flexible operation, respectively, because more efficient thermodynamic performance is achieved during the investigated operating scenarios. The control structure, layer and loop play different roles in terms of energy behavior and require reasonable regulation to optimize energy behavior. This study provides an important insight into using control optimization aided by the dynamic exergy method to implement energy-efficient operations for industrial plants.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:energy:v:152:y:2018:i:c:p:313-321
    DOI: 10.1016/j.energy.2018.03.154
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    References listed on IDEAS

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    1. Hu, Yukun & Li, Xun & Li, Hailong & Yan, Jinyue, 2013. "Peak and off-peak operations of the air separation unit in oxy-coal combustion power generation systems," Applied Energy, Elsevier, vol. 112(C), pages 747-754.
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    3. Fu, Chao & Gundersen, Truls, 2013. "Recuperative vapor recompression heat pumps in cryogenic air separation processes," Energy, Elsevier, vol. 59(C), pages 708-718.
    4. 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.
    5. Fu, Chao & Gundersen, Truls, 2012. "Using exergy analysis to reduce power consumption in air separation units for oxy-combustion processes," Energy, Elsevier, vol. 44(1), pages 60-68.
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    Cited by:

    1. Zhou, Xia & Zhang, Hanwei & Rong, Yangyiming & Song, Jian & Fang, Song & Xu, Zhuoren & Zhi, Xiaoqin & Wang, Kai & Qiu, Limin & Markides, Christos N., 2022. "Comparative study for air compression heat recovery based on organic Rankine cycle (ORC) in cryogenic air separation units," Energy, Elsevier, vol. 255(C).
    2. Charalampos Michalakakis & Jonathan M. Cullen, 2022. "Dynamic exergy analysis: From industrial data to exergy flows," Journal of Industrial Ecology, Yale University, vol. 26(1), pages 12-26, February.
    3. Jin, Bo & Yao, Wenxing & Liu, Kaile & Lu, Shijian & Luo, Xiao & Liang, Zhiwu, 2022. "Self-optimizing control and safety assessment to achieve economic and safe operation for oxy-fuel combustion boiler island systems," Applied Energy, Elsevier, vol. 323(C).
    4. 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.

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