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Techno-economic assessment and optimization of PZ/MDEA-based CO2 capture for coal-fired power plant

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  • Li, Jixin
  • Luo, Qiwei
  • Jiang, Jintao
  • Xiang, Wenguo
  • Chen, Shiyi

Abstract

This work investigated the thermodynamic and economic performances of the monoethanolamine (MEA) and piperazine/methyldiethanolamine (PZ/MDEA)-based post-combustion CO2 capture (PCC) processes with a 600 MWe coal-fired power plant. The plant integrated with a PCC unit was initially optimized with the thermal integration strategies. Then, the sensitivity analysis of the primary parameters of the PCC, including CO2 loading of lean solvent, stripping pressure, and CO2 capture ratio, was conducted. Finally, absorber intercooling, rich-split, and mechanical vapor recompression modifications were adopted further to decrease the reboiler heat duty for CO2 capture, thereby increasing the plant's power efficiency. The reboiler heat duties of the MEA and PZ/MDEA-based PCC processes are reduced to 3.01 GJ/tCO2 and 2.07 GJ/tCO2. The efficiency of the MEA-based power plant increased from 26.30 % to 32.81 %, and the PZ/MDEA-based power plant increased from 30.71 % to 34.88 %. The efficiency penalties of the plant integrated with optimized MEA and PZ/MDEA-based PCC are reduced to 8.92 and 6.85 percentage points, respectively. The power plant with MEA and PZ/MDEA-based PCC can achieve positive profitability by including the carbon tax, and it could also offset the cost of carbon reduction by carbon trading. The results show that the optimized plant with a PZ/MDEA-based PCC has lower energy consumption and lower CO2 reduction cost than MEA, rendering it a competitive alternative for PCC retrofitting in coal-fired power plants.

Suggested Citation

  • Li, Jixin & Luo, Qiwei & Jiang, Jintao & Xiang, Wenguo & Chen, Shiyi, 2025. "Techno-economic assessment and optimization of PZ/MDEA-based CO2 capture for coal-fired power plant," Energy, Elsevier, vol. 327(C).
    • Handle: RePEc:eee:energy:v:327:y:2025:i:c:s0360544225020377
    DOI: 10.1016/j.energy.2025.136395
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