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Flash evaporation and thermal vapor compression aided energy saving CO2 capture systems in coal-fired power plant

Author

Listed:
  • Zhang, Kefang
  • Liu, Zhongliang
  • Wang, Yuanya
  • Li, Yanxia
  • Li, Qingfang
  • Zhang, Jian
  • Liu, Haili

Abstract

In this paper, flash evaporation and thermal vapor compression are used to reduce heat consumption of CO2 capture processes and two improved capture systems are proposed. One is the flash evaporator (FE) and thermal vapor compressor (TVC)-aided system, the other is the heated flash evaporator (HFE) and thermal vapor compressor (TVC)-aided system. Analyses are carried out to verify their effectiveness in reducing heat consumption. Compared with the base CO2 capture system of 108.76t/h CO2 capture capacity from a 660 MW coal-fired power unit, the FE-TVC-aided capture system reduces the specific heat consumption from 4.421GJ/tCO2 to 4.161GJ/tCO2, and the specific exergy consumption from 1.368GJ/tCO2 to 1.275GJ/tCO2, the corresponding energy saving and exergy saving are 10.3%, and the plant electric efficiency penalty is decreased from 11.83% to 11.02%, on condition that the CO2 recovery ratio is set at 90%. Compared with the base CO2 capture system, the HFE-TVC-aided capture system reduces the heat consumption from 4.421GJ/tCO2 to 4.057GJ/tCO2, and the specific exergy consumption from 1.368GJ/tCO2 to 1.243GJ/tCO2, the corresponding energy saving and exergy saving are 12.5%, and the plant electric efficiency penalty is decreased from 11.83% to 10.80%.

Suggested Citation

  • Zhang, Kefang & Liu, Zhongliang & Wang, Yuanya & Li, Yanxia & Li, Qingfang & Zhang, Jian & Liu, Haili, 2014. "Flash evaporation and thermal vapor compression aided energy saving CO2 capture systems in coal-fired power plant," Energy, Elsevier, vol. 66(C), pages 556-568.
    • Handle: RePEc:eee:energy:v:66:y:2014:i:c:p:556-568
    DOI: 10.1016/j.energy.2014.01.063
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    References listed on IDEAS

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    Cited by:

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    2. Kefang Zhang & Zhongliang Liu & Zhaoliang Wang & Yanxia Li, 2016. "Specific exergy consumption as an index for steam extraction scheme selection for CO 2 capture systems in coal‐fired power plants," Greenhouse Gases: Science and Technology, Blackwell Publishing, vol. 6(2), pages 275-287, April.
    3. Song, Chunfeng & Liu, Qingling & Ji, Na & Deng, Shuai & Zhao, Jun & Kitamura, Yutaka, 2017. "Natural gas purification by heat pump assisted MEA absorption process," Applied Energy, Elsevier, vol. 204(C), pages 353-361.
    4. Nwaoha, Chikezie & Tontiwachwuthikul, Paitoon, 2019. "Carbon dioxide capture from pulp mill using 2-amino-2-methyl-1-propanol and monoethanolamine blend: Techno-economic assessment of advanced process configuration," Applied Energy, Elsevier, vol. 250(C), pages 1202-1216.
    5. Reddick, Christopher & Sorin, Mikhail & Sapoundjiev, Hristo & Aidoun, Zine, 2016. "Carbon capture simulation using ejectors for waste heat upgrading," Energy, Elsevier, vol. 100(C), pages 251-261.
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    7. Wang, Ning & Wen, Zongguo & Liu, Mingqi & Guo, Jie, 2016. "Constructing an energy efficiency benchmarking system for coal production," Applied Energy, Elsevier, vol. 169(C), pages 301-308.

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