Annual economic performance of a solar-aided 600 MW coal-fired power generation system under different tracking modes, aperture areas, and storage capacities
Annual economic performance of a solar-aided 600 MW coal-fired power generation system under different tracking modes, aperture areas, and storage capacities
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DOI：
10.1016/j.applthermaleng.2016.05.057
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发表时间：
2016-07
影响因子：
6.4
通讯作者：
Junjie Wu;Hongjuan Hou;Yongping Yang
中科院分区：
文献类型：
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作者：
Junjie Wu;Hongjuan Hou;Yongping Yang
太阳能辅助燃煤发电（SACPG）系统是一种有效利用太阳能的方式。本文基于逐时气象数据，对采用太阳能抛物槽技术的600mw SACPG系统进行了模拟。利用太阳能场对给水进行预热，取代原有燃煤机组的高压抽汽。基于年度性能和非设计性能，从热力学和经济角度对SACPG系统的主要参数（TES）小时、太阳能倍数（SM）和排间距/孔径比（S/W比）进行了优化。此外，当特定部件的成本发生变化时，进行敏感的经济分析。热力学和敏感经济分析表明，应根据土地成本和跟踪模式确定S/W比，以平衡年度太阳能发电效率（SEE）和较低的平准化电力成本（LCOE）。此外，虽然一个TES系统可以实现SACPG系统的年SEE，但其优化容量应由太阳能场和TES系统的成本决定。因此，最后提出了一个平衡点，以确定在什么条件下设置TES系统是经济的。
The solar-aided coal-fired power generation (SACPG) system is proven to be an effective way to use solar energy. In this work, a 600 MW SACPG system using solar parabolic trough technology is simulated based on hourly meteorological data. Solar field is used to preheat feedwater to replace high-pressure extraction steam of the original coal-fired unit.Based on annual and off-design performance, the main parameters of the SACPG system, such as thermal energy storage (TES) hours, solar multiple (SM) and ratio of row spacing to aperture width (S/W ratio) are optimized from the thermodynamic and economic viewpoints. Besides, a sensitive economic analysis is performed when the cost of a specific component changes.The thermodynamic and sensitive economic analysis reveals the S/W ratio should be determined depending on land cost and tracking mode to balance between annual solar-to-electricity efficiency (SEE) and lower levelized cost of electricity (LCOE). Besides, although a TES system could annual SEE of SACPG system, its optimized capacity should be determined by the cost of the solar field and the TES system. Therefore, a balance point is proposed in the end to determine on what condition it is economical to set a TES system.