Exergoeconomic analysis and multi-objective optimization of a CCHP system based on LNG cold energy utilization and flue gas waste heat recovery with CO2 capture

Yang Liu, Jitian Han and Huailiang You

Energy, 2020, vol. 190, issue C

Abstract: A CCHP system based on LNG cold energy utilization and flue gas waste heat recovery with CO2 capture is proposed to efficiently achieve the cascading use of comprehensive energy. The mathematical models are developed and the system performance under steady-state conditions is analyzed using the energy and exergy methods. The calculation results show that the cooling, heating and net power outputs of the proposed CCHP system are 29.601 MW, 4.211 MW and 12.036 MW, respectively, and a CO2 capture rate of 7.9236 t/h can be reached while the exergy efficiency is 38.39%. The effects of the LNG pump outlet pressure, the multistage compressor outlet pressure, the CO2 flow rate in district cooling cycle, isentropic efficiencies of turbines and ambient temperature on the performance of the proposed CCHP system are analyzed. In addition, the exergoeconomic analysis is used to calculate the unit cost of the trigeneration, and a multi-objective optimization using NSGA-II is conducted to search for the optimal design parameters. The optimization results indicate that the total energy output, the exergy efficiency and the cost per unit exergy for the trigeneration are 90.65 MW, 41.38%, 18.05 $/GJ, respectively.

Keywords: CCHP; LNG regasification; Transcritical CO2 cycle; CO2 capture; Exergoeconomic analysis; Multi-objective optimization (search for similar items in EconPapers)
Date: 2020
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Citations: View citations in EconPapers (20)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:190:y:2020:i:c:s0360544219318961

DOI: 10.1016/j.energy.2019.116201

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