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Study on integrated solar combined cycle system with a new operation strategy of changeable integration mode under different Direct Normal Irradiance (DNI) conditions
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-10 , DOI: 10.1002/ese3.711 Zhen Wang 1 , Liqiang Duan 1
Energy Science & Engineering ( IF 3.5 ) Pub Date : 2020-05-10 , DOI: 10.1002/ese3.711 Zhen Wang 1 , Liqiang Duan 1
Affiliation
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Integrated solar combined cycle (ISCC) system, which integrates solar thermal energy into traditional gas turbine combined cycle (GTCC) system, has become an efficient way to reduce the levelized cost of electricity (LCOE) and improve the thermal efficiency of the GTCC system. However, the volatility of solar energy usually results in low ISCC system thermal efficiency when no or low direct normal irradiance (DNI) is available because the ISCC system is usually not equipped with thermal energy storage system. In this paper, the ISCC system with a new operation strategy of changeable integration mode under different DNI conditions is proposed. The ISCC system model is constructed using the EBSILON software. Performance of ISCC system using the new operation strategy is investigated deeply. The results show that the ISCC system using the new operation strategy has higher annual solar to electricity efficiency (19.08%), 1.1% higher than that of the traditional ISCC system. Due to different DNI distributions in a whole year, the larger the distribution proportion of the low‐value DNI is, the greater the thermodynamic performance advantage of ISCC system with the optimization strategy is. Through the economic performance analysis, the LCOE of the ISCC system with the new optimization strategy is 0.223 $/kW·h, 0.01 $/kW·h lower than that of the traditional ISCC system. The LCOE decreases at first and then increases with the increase of the number of the parabolic trough collector. The optimal number of the parabolic trough collector corresponding to the new optimization strategy is 500. So this new operation strategy provides a new way for adequately utilizing the solar energy in ISCC system.
中文翻译：
在不同的直接法向辐照度（DNI）条件下采用可变模式的新运行策略的集成太阳能联合循环系统的研究
集成太阳能联合循环（ISCC）系统将太阳能热能集成到传统的燃气轮机联合循环（GTCC）系统中，已成为降低平均电力成本（LCOE）和提高GTCC系统热效率的有效途径。然而，当没有或仅有低的直接法向辐照度（DNI）时，太阳能的挥发性通常会导致ISCC系统的热效率低，因为ISCC系统通常没有配备热能存储系统。本文提出了一种具有不同DNI条件下可变集成模式的新操作策略的ISCC系统。ISCC系统模型是使用EBSILON软件构建的。使用新的操作策略对ISCC系统的性能进行了深入研究。结果表明，采用新运行策略的ISCC系统的年太阳能发电效率为19.08％，比传统ISCC系统高1.1％。由于全年的DNI分布不同，低值DNI的分布比例越大，采用优化策略的ISCC系统的热力学性能优势就越大。通过经济绩效分析，采用新优化策略的ISCC系统的LCOE为0.223 $ / kW·h，比传统ISCC系统低0.01 $ / kW·h。LCOE首先下降，然后随着抛物线槽收集器数量的增加而增加。与新的优化策略相对应的抛物线槽收集器的最佳数量为500。
更新日期：2020-05-10
中文翻译：
在不同的直接法向辐照度（DNI）条件下采用可变模式的新运行策略的集成太阳能联合循环系统的研究
集成太阳能联合循环（ISCC）系统将太阳能热能集成到传统的燃气轮机联合循环（GTCC）系统中，已成为降低平均电力成本（LCOE）和提高GTCC系统热效率的有效途径。然而，当没有或仅有低的直接法向辐照度（DNI）时，太阳能的挥发性通常会导致ISCC系统的热效率低，因为ISCC系统通常没有配备热能存储系统。本文提出了一种具有不同DNI条件下可变集成模式的新操作策略的ISCC系统。ISCC系统模型是使用EBSILON软件构建的。使用新的操作策略对ISCC系统的性能进行了深入研究。结果表明，采用新运行策略的ISCC系统的年太阳能发电效率为19.08％，比传统ISCC系统高1.1％。由于全年的DNI分布不同，低值DNI的分布比例越大，采用优化策略的ISCC系统的热力学性能优势就越大。通过经济绩效分析，采用新优化策略的ISCC系统的LCOE为0.223 $ / kW·h，比传统ISCC系统低0.01 $ / kW·h。LCOE首先下降，然后随着抛物线槽收集器数量的增加而增加。与新的优化策略相对应的抛物线槽收集器的最佳数量为500。
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