Thermodynamic analysis of a novel hydrogen–electricity–heat polygeneration system based on a very high-temperature gas-cooled reactor

Hang Ni, Wei Peng, Xinhe Qu, Gang Zhao, Ping Zhang and Jie Wang

Energy, 2022, vol. 249, issue C

Abstract: Nuclear energy can offer clean, efficient, and large-scale hydrogen production, and a polygeneration system can meet multi-level energy demands. In this study, a novel polygeneration system coupled with a very high-temperature gas-cooled reactor is proposed for realizing the cascade utilization of energy. High-grade heat is used for the high-temperature processes of hydrogen production, and low-grade heat is used for the low-temperature processes of hydrogen production, electricity generation, and process heat extraction. The system can output hydrogen, electricity, and high-temperature steam simultaneously. Process simulation of iodine-sulfur cycle is performed to obtain heat duty of each component in hydrogen production process. Energy and exergy analyses are used to analyze thermodynamic performance of the system. The power ratio (PR) of electricity generation to hydrogen production and the share of the main steam extracted for heat supply (αSTSR) are two important parameters for determining energy distribution of the system, and the overall energy and exergy efficiencies of the system reach 51.27% and 66.96%, respectively, when PR = 1 and αSTSR = 0.15. The sulfuric-acid concentration tower has the largest exergy loss coefficient of 8.89%, followed by steam generator of 7.04%. These are crucial components for improving thermodynamic performance of the system.

Keywords: Very high-temperature gas-cooled reactor; Iodine-sulfur cycle; Hydrogen–electricity–heat polygeneration system; Thermodynamic performance (search for similar items in EconPapers)
Date: 2022
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Citations: View citations in EconPapers (6)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:249:y:2022:i:c:s0360544222005989

DOI: 10.1016/j.energy.2022.123695

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