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Flexibility enhancement versus thermal efficiency of coal-fired power units during the condensate throttling processes

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  • Zhang, Kezhen
  • Zhao, Yongliang
  • Liu, Ming
  • Gao, Lin
  • Fu, Yue
  • Yan, Junjie

Abstract

The improvement in operational flexibility of thermal power plants plays an essential role in the stable and safe operation of large-scale power grids. Condensate throttling is an effective method for enhancing the operational flexibility of thermal power plants, but it inevitably influences their thermal efficiency. In fact, the entire condensate throttling process consists of two stages: the condensate throttling process and the recovery process of the deaerator water level. To evaluate exergy efficiency during the entire condensate throttling process, dynamic models of a condensate throttling system were developed and exergy analysis was performed. Results indicate that additional exergy losses occur during the condensate throttling process. The cold end system is the component that exhibits the highest additional exergy loss (64.89%), followed by the deaerator (40.49%), heaters (4.82%), and turbines (−10.20%). Operational flexibility is in contrast with thermal efficiency during the condensate throttling process. The cycling and total exergy losses of the system increase with an increase in the condensate throttled ratio. Cycling loss can be decreased by a maximum of 51.46% by selecting an appropriate condensate water adjustment strategy during the entire condensate throttling process.

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  • Zhang, Kezhen & Zhao, Yongliang & Liu, Ming & Gao, Lin & Fu, Yue & Yan, Junjie, 2021. "Flexibility enhancement versus thermal efficiency of coal-fired power units during the condensate throttling processes," Energy, Elsevier, vol. 218(C).
    • Handle: RePEc:eee:energy:v:218:y:2021:i:c:s0360544220326414
    DOI: 10.1016/j.energy.2020.119534
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    as
    1. Liao, Gaoliang & E, Jiaqiang & Zhang, Feng & Chen, Jingwei & Leng, Erwei, 2020. "Advanced exergy analysis for Organic Rankine Cycle-based layout to recover waste heat of flue gas," Applied Energy, Elsevier, vol. 266(C).
    2. Wang, Jiawei & You, Shi & Zong, Yi & Cai, Hanmin & Træholt, Chresten & Dong, Zhao Yang, 2019. "Investigation of real-time flexibility of combined heat and power plants in district heating applications," Applied Energy, Elsevier, vol. 237(C), pages 196-209.
    3. Zhao, Yongliang & Liu, Ming & Wang, Chaoyang & Wang, Zhu & Chong, Daotong & Yan, Junjie, 2019. "Exergy analysis of the regulating measures of operational flexibility in supercritical coal-fired power plants during transient processes," Applied Energy, Elsevier, vol. 253(C), pages 1-1.
    4. Wu, Tao & Ge, Zhihua & Yang, Lijun & Du, Xiaoze, 2019. "Transient behavior of the cold end system in an indirect dry cooling thermal power plant under varying operating conditions," Energy, Elsevier, vol. 181(C), pages 1202-1212.
    5. Qing, He & Lijian, Wang & Qian, Zhou & Chang, Lu & Dongmei, Du & Wenyi, Liu, 2019. "Thermodynamic analysis and optimization of liquefied air energy storage system," Energy, Elsevier, vol. 173(C), pages 162-173.
    6. Wang, Wei & Liu, Jizhen & Zeng, Deliang & Niu, Yuguang & Cui, Can, 2015. "An improved coordinated control strategy for boiler-turbine units supplemented by cold source flow adjustment," Energy, Elsevier, vol. 88(C), pages 927-934.
    7. Guan, Bowen & Liu, Xiaohua & Zhang, Tao, 2020. "Analytical solutions for the optimal cooling and heating source temperatures in liquid desiccant air-conditioning system based on exergy analysis," Energy, Elsevier, vol. 203(C).
    8. Yang, Tingting & Wang, Wei & Zeng, Deliang & Liu, Jizhen & Cui, Can, 2017. "Closed-loop optimization control on fan speed of air-cooled steam condenser units for energy saving and rapid load regulation," Energy, Elsevier, vol. 135(C), pages 394-404.
    9. Pupo-Roncallo, Oscar & Campillo, Javier & Ingham, Derek & Hughes, Kevin & Pourkashanian, Mohammed, 2019. "Large scale integration of renewable energy sources (RES) in the future Colombian energy system," Energy, Elsevier, vol. 186(C).
    10. Wang, Zhu & Liu, Ming & Zhao, Yongliang & Wang, Chaoyang & Chong, Daotong & Yan, Junjie, 2020. "Flexibility and efficiency enhancement for double-reheat coal-fired power plants by control optimization considering boiler heat storage," Energy, Elsevier, vol. 201(C).
    11. Zhao, Yongliang & Wang, Chaoyang & Liu, Ming & Chong, Daotong & Yan, Junjie, 2018. "Improving operational flexibility by regulating extraction steam of high-pressure heaters on a 660 MW supercritical coal-fired power plant: A dynamic simulation," Applied Energy, Elsevier, vol. 212(C), pages 1295-1309.
    12. Zhang, Kezhen & Liu, Ming & Zhao, Yongliang & Wang, Chaoyang & Yan, Junjie, 2020. "Entropy generation versus transition time of heat exchanger during transient processes," Energy, Elsevier, vol. 200(C).
    13. Gupta, Rohit & Asgari, Sahar & Moazamigoodarzi, Hosein & Pal, Souvik & Puri, Ishwar K., 2020. "Cooling architecture selection for air-cooled Data Centers by minimizing exergy destruction," Energy, Elsevier, vol. 201(C).
    14. Fernández-Guillamón, Ana & Gómez-Lázaro, Emilio & Muljadi, Eduard & Molina-García, Ángel, 2019. "Power systems with high renewable energy sources: A review of inertia and frequency control strategies over time," Renewable and Sustainable Energy Reviews, Elsevier, vol. 115(C).
    15. Wang, Chaoyang & Zhao, Yongliang & Liu, Ming & Qiao, Yongqiang & Chong, Daotong & Yan, Junjie, 2018. "Peak shaving operational optimization of supercritical coal-fired power plants by revising control strategy for water-fuel ratio," Applied Energy, Elsevier, vol. 216(C), pages 212-223.
    16. Wang, Chaoyang & Liu, Ming & Li, Bingxin & Liu, Yiwen & Yan, Junjie, 2017. "Thermodynamic analysis on the transient cycling of coal-fired power plants: Simulation study of a 660 MW supercritical unit," Energy, Elsevier, vol. 122(C), pages 505-527.
    17. Han, Zhonghe & Xiang, Peng, 2020. "Modeling condensate throttling to improve the load change performance of cogeneration units," Energy, Elsevier, vol. 192(C).
    18. Wang, Wei & Zeng, Deliang & Liu, Jizhen & Niu, Yuguang & Cui, Can, 2014. "Feasibility analysis of changing turbine load in power plants using continuous condenser pressure adjustment," Energy, Elsevier, vol. 64(C), pages 533-540.
    19. Shu-Xia Li & Jie-Sheng Wang, 2015. "Dynamic Modeling of Steam Condenser and Design of PI Controller Based on Grey Wolf Optimizer," Mathematical Problems in Engineering, Hindawi, vol. 2015, pages 1-9, December.
    20. Kanoglu, Mehmet & Dincer, Ibrahim & Rosen, Marc A., 2007. "Understanding energy and exergy efficiencies for improved energy management in power plants," Energy Policy, Elsevier, vol. 35(7), pages 3967-3978, July.
    21. Liu, Rongtang & Liu, Ming & Zhao, Yongliang & Ma, Yuegeng & Yan, Junjie, 2021. "Thermodynamic study of a novel lignite poly-generation system driven by solar energy," Energy, Elsevier, vol. 214(C).
    22. Long, Dongteng & Wang, Wei & Yao, Chu & Liu, Jizhen, 2017. "An experiment-based model of condensate throttling and its utilization in load control of 1000 MW power units," Energy, Elsevier, vol. 133(C), pages 941-954.
    23. Wang, Chaoyang & Liu, Ming & Zhao, Yongliang & Qiao, Yongqiang & Chong, Daotong & Yan, Junjie, 2018. "Dynamic modeling and operation optimization for the cold end system of thermal power plants during transient processes," Energy, Elsevier, vol. 145(C), pages 734-746.
    24. Gao, Mingming & Hong, Feng & Liu, Jizhen, 2017. "Investigation on energy storage and quick load change control of subcritical circulating fluidized bed boiler units," Applied Energy, Elsevier, vol. 185(P1), pages 463-471.
    25. Liu, Ming & Wang, Shan & Yan, Junjie, 2021. "Operation scheduling of a coal-fired CHP station integrated with power-to-heat devices with detail CHP unit models by particle swarm optimization algorithm," Energy, Elsevier, vol. 214(C).
    26. Liu, Ji-Zhen & Yan, Shu & Zeng, De-Liang & Hu, Yong & Lv, You, 2015. "A dynamic model used for controller design of a coal fired once-through boiler-turbine unit," Energy, Elsevier, vol. 93(P2), pages 2069-2078.
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