Thermodynamic assessment of a molten salt solar power tower integrated with a supercritical CO2 Brayton cycle under Brazilian solar conditions

IF 6 2区工程技术 Q2 ENERGY & FUELS

Solar Energy Pub Date : 2025-09-16 DOI:10.1016/j.solener.2025.113962

Igor Marques Alves, Cristiana Brasil Maia

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Abstract

This study evaluates the thermodynamic performance of a 100 MWe solar power tower (SPT) plant using molten salt as the heat transfer fluid and thermal energy storage (TES), integrated with a supercritical CO₂ recompression Brayton cycle. Simulations were conducted for five Brazilian locations with varying solar resources: Chapada dos Guimarães, Januária, Monte Alegre, Petrolina, and Rio Grande. The thermodynamic cycle was validated against literature and optimized for thermal efficiency. A turbine inlet temperature of 565 °C and a thermal input of 206.8 MWt resulted in a cycle efficiency of 48.36 %. Parametric analyses were performed for solar multiples (SM = 1–3) and TES durations (0–15 h). Results show that a 15-hour TES and SM of 3 optimized the capacity factor (CF) in most locations, reaching up to 100 % in Chapada dos Guimarães. The southern site (Rio Grande) required a lower SM (2.5) for optimal performance. Despite regional differences in direct normal irradiance, all configurations demonstrated the feasibility of CSP deployment in Brazil.

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巴西太阳能条件下融合超临界CO2布雷顿循环的熔盐太阳能发电塔的热力学评估

本研究评估了100 MWe太阳能发电塔（SPT）电厂的热力学性能，该电厂采用熔盐作为传热流体和热能储存（TES），并集成了超临界CO2再压缩布雷顿循环。模拟在巴西五个太阳能资源不同的地点进行：Chapada dos guimar es, Januária, Monte Alegre， Petrolina和里约热内卢Grande。根据文献验证了热力学循环，并对热效率进行了优化。涡轮入口温度为565°C，热输入为206.8 MWt，循环效率为48.36%。对太阳倍数（SM = 1-3）和TES持续时间（0-15小时）进行参数分析。结果表明，15小时的TES和3小时的SM在大多数地点优化了容量因子（CF），在Chapada dos guimar es达到100%。南部站点（里约热内卢Grande）需要较低的SM（2.5）以获得最佳性能。尽管在直接正常辐照度方面存在地区差异，但所有配置都证明了CSP在巴西部署的可行性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Solar Energy 工程技术-能源与燃料

CiteScore

13.90

自引率

9.00%

发文量

审稿时长

47 days

期刊介绍： Solar Energy welcomes manuscripts presenting information not previously published in journals on any aspect of solar energy research, development, application, measurement or policy. The term "solar energy" in this context includes the indirect uses such as wind energy and biomass