4.7 Article

System integration for combined heat and power (CHP) plants with post-combustion CO2 capture

Journal

ENERGY CONVERSION AND MANAGEMENT
Volume 258, Issue -, Pages -

Publisher

PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.enconman.2022.115508

Keywords

Post-combustion CO2 capture; Combined heat and power; Waste heat recovery; Absorption heat exchanger

Funding

  1. China Postdoctoral Science Foundation [2021M691551]
  2. National Key R&D Program of China [2018YFB1502900, 2018YFB1502903]
  3. National Natural Science Foundation of China [51676096]

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A new integration scheme for combined heat and power (CHP) plant with post-combustion CO2 capture is proposed in this study. By optimizing parameter matching and recovering waste heat, the system's heating capacity and overall efficiency are increased, leading to a reduction in the cost of electricity and CO2 avoidance cost.
Based on a typical 1000 MWe coal-fired power plant with ultra-supercritical parameters, this study proposes a new integration scheme for the combined heat and power (CHP) plant with post-combustion CO2 capture. By introducing a back-pressure heat supply (BPHS) turbine and a back-pressure CO2 capture (BPCC) turbine, the superheated degree of the extraction steam is effectively retrieved for parameter matching of CO2 capture and heat supply. With 90% CO2 capture efficiency and 785.06 MWth heat supply, the total efficiency penalty for the CHP plants with solid amine-based CO2 capture reaches 19.32%. To optimize the proposed integration scheme, over 90% of the waste heat in the CO2 capture is recovered by applying the absorption heat exchanger (AHE) to increase the heating capacity of the integrated system. Energy analysis results show that the heating capacity of the integrated system is increased by 64.18%. Exergy analysis results reveal that the exergy destruction of the CO2 capture process and the heat exchange between the primary and secondary heating networks is reduced by 40.27 MWex and 10.33 MWex. Economic analysis results show that the cost of electricity (COE) and the cost of CO2 avoided (COA) are reduced by 2.59 $/MWh and 4.19 $/t CO2.

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