Elmorsy Louay, Morosuk Tatiana, Tsatsaronis George
Energy Engineering Department, Campus El Gouna, Technische Universität Berlin, Ackerstraße 76, 13355 Berlin, Germany.
Institute for Energy Engineering, Technische Universität Berlin, Marchstraße 18, 10587 Berlin, Germany.
Entropy (Basel). 2020 Jun 13;22(6):655. doi: 10.3390/e22060655.
The transition towards higher shares of electricity generation from renewable energy sources is shown to be significantly slower in developing countries with low-cost fossil fuel resources. Integrating conventional power plants with concentrated solar power may facilitate the transition towards a more sustainable power production. In this paper, a novel natural gas-fired integrated solar combined-cycle power plant was proposed, evaluated, and optimized with exergy-based methods. The proposed system utilizes the advantages of combined-cycle power plants, direct steam generation, and linear Fresnel collectors to provide 475 MW baseload power in Aswan, Egypt. The proposed system is found to reach exergetic efficiencies of 50.7% and 58.1% for day and night operations, respectively. In economic analysis, a weighted average levelized cost of electricity of 40.0 $/MWh based on the number of day and night operation hours is identified. In exergoeconomic analysis, the costs of thermodynamic inefficiencies were identified and compared to the component cost rates. Different measures for component cost reduction and performance enhancement were identified and applied. Using iterative exergoeconomic optimization, the levelized cost of electricity is reduced to a weighted average of 39.2 $/MWh and a specific investment cost of 1088 $/kW. Finally, the proposed system is found to be competitive with existing integrated solar combined-cycle plants, while allowing a significantly higher solar share of 17% of the installed capacity.
研究表明，在拥有低成本化石燃料资源的发展中国家，向更高比例可再生能源发电的转型明显较慢。将传统发电厂与聚光太阳能发电相结合，可能有助于向更可持续的电力生产转型。本文提出了一种新型天然气集成太阳能联合循环发电厂，并采用基于㶲的方法对其进行评估和优化。该系统利用联合循环发电厂、直接蒸汽发生和线性菲涅尔集热器的优势，在埃及阿斯旺提供475兆瓦的基本负荷电力。结果发现，该系统在白天和夜间运行时的㶲效率分别达到50.7%和58.1%。在经济分析中，根据白天和夜间运行小时数确定加权平均平准化度电成本为40.0美元/兆瓦时。在㶲经济分析中，确定了热力效率低下的成本，并与组件成本率进行了比较。确定并应用了降低组件成本和提高性能的不同措施。通过迭代㶲经济优化，平准化度电成本降至加权平均39.2美元/兆瓦时，特定投资成本降至1088美元/千瓦。最后，结果发现该系统与现有的集成太阳能联合循环发电厂具有竞争力，同时允许太阳能占装机容量的比例显著提高至17%。
