Waste heat recovery of a combined regenerative gas turbine - recompression supercritical CO2 Brayton cycle driven by a hybrid solar-biomass heat source for multi-generation purpose: 4E analysis and parametric study

Yan Cao, Hamed Habibi, Mohammad Zoghi and Amir Raise

Energy, 2021, vol. 236, issue C

Abstract: This study substantiates that the waste heat of a combined regenerative gas turbine cycle (GTC) and recompression supercritical CO2 Brayton cycle (SCBC) driven by a hybrid solar-biomass heat source can be effectively recovered via combining various subsystems encompassing a thermoelectric generator, an LiBr–H2O absorption refrigeration system, a heat recovery steam generator, and a proton exchange membrane electrolyzer with the cycle. The environmental and exergoeconomic performances of the system under a base case are compared between a hybrid solar-biomass mode (with direct normal irradiance (DNI) of 0.8 kW m−2) and biomass-only mode (while DNI is lower than 0.4 kW m−2). The results indicate that the employment of the solar power tower results in slight reductions in environmental impacts, while significant diminutions in thermodynamic and economic performances. For hybrid and biomass-only modes, the total energy efficiency of the system correspondingly improves by 22.48 and 29.6% points and the total exergy efficiency of the system respectively enhances by 6.18 and 7.6% points thanks to recovering the waste energy from the regenerative GTC - recompression SCBC via the proposed systems, while the utilized subsystems in the two mentioned modes respectively account for merely 5.1% and 8.1% of the system total cost rate.

Keywords: Multi-generation; Hybrid heat source; Biomass gasification; Solar power tower; Waste heat recovery; Recompression supercritical Brayton cycle; Thermoelectric generator (search for similar items in EconPapers)
Date: 2021
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Citations: View citations in EconPapers (11)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:236:y:2021:i:c:s0360544221016807

DOI: 10.1016/j.energy.2021.121432

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