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Optimal integration of compression heat with regenerative steam Rankine cycles in oxy-combustion coal based power plants

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  • Fu, Chao
  • Anantharaman, Rahul
  • Gundersen, Truls

Abstract

The integration of process heat with regenerative steam Rankine cycles by preheating the boiler feedwater increases power generation from the steam turbines. In oxy-combustion coal based power plants, considerable compression heat from the air separation unit is available for such heat integration, however, there are at least two challenges: (1) how to integrate a heat stream with the steam cycle, and (2) how to optimize the compression scheme, accounting for the trade-off between compression work requirement and the turbine power output. This paper investigates the optimal integration of the air compression train in a cryogenic air separation unit with the regenerative steam cycle in an oxy-combustion coal based power plant using MINLP (mixed Integer non-linear programming) Two special cases (adiabatic compression and “isothermal” compression) are also investigated to compare with the optimization results. The study shows that such heat integration increases the thermal efficiency of the reference power plant by a maximum of 0.5–0.6% points. The heat integration is less attractive when the temperature difference of the heat transfer between the compressed gas and the boiler feedwater is larger than 40 °C.

Suggested Citation

  • Fu, Chao & Anantharaman, Rahul & Gundersen, Truls, 2015. "Optimal integration of compression heat with regenerative steam Rankine cycles in oxy-combustion coal based power plants," Energy, Elsevier, vol. 84(C), pages 612-622.
    • Handle: RePEc:eee:energy:v:84:y:2015:i:c:p:612-622
    DOI: 10.1016/j.energy.2015.03.023
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    References listed on IDEAS

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    1. Luo, Xianglong & Zhang, Bingjian & Chen, Ying & Mo, Songping, 2012. "Heat integration of regenerative Rankine cycle and process surplus heat through graphical targeting and mathematical modeling technique," Energy, Elsevier, vol. 45(1), pages 556-569.
    2. Bruhn, Matthias, 2002. "Hybrid geothermal–fossil electricity generation from low enthalpy geothermal resources: geothermal feedwater preheating in conventional power plants," Energy, Elsevier, vol. 27(4), pages 329-346.
    3. 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. Kotowicz, Janusz & Michalski, Sebastian, 2016. "Thermodynamic and economic analysis of a supercritical and an ultracritical oxy-type power plant without and with waste heat recovery," Applied Energy, Elsevier, vol. 179(C), pages 806-820.
    2. 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).
    3. Zhiyu Zhang & Rongrong Zhai & Xinwei Wang & Yongping Yang, 2020. "Sensitivity Analysis and Optimization of Operating Parameters of an Oxyfuel Combustion Power Generation System Based on Single-Factor and Orthogonal Design Methods," Energies, MDPI, vol. 13(4), pages 1-22, February.
    4. 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.
    5. Zhou, Xia & Fang, Song & Zhang, Hanwei & Xu, Zhuoren & Jiang, Hanying & Rong, Yangyiming & Wang, Kai & Zhi, Xiaoqin & Qiu, Limin, 2023. "Dynamic characteristics of a mechanically coupled organic Rankine-vapor compression system for heat-driven cooling," Energy, Elsevier, vol. 280(C).
    6. Wang, Maojian & Liu, Guilian & Hui, Chi Wai, 2017. "Novel shortcut optimization model for regenerative steam power plant," Energy, Elsevier, vol. 138(C), pages 529-541.
    7. Fu, Chao & Vikse, Matias & Gundersen, Truls, 2018. "Work and heat integration: An emerging research area," Energy, Elsevier, vol. 158(C), pages 796-806.
    8. Fu, Chao & Gundersen, Truls, 2016. "Correct integration of compressors and expanders in above ambient heat exchanger networks," Energy, Elsevier, vol. 116(P2), pages 1282-1293.

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