Performance model and annual yield comparison of parabolic-trough solar thermal power plants with either nitrogen or synthetic oil as heat transfer fluid
Performance model and annual yield comparison of parabolic-trough solar thermal power plants with either nitrogen or synthetic oil as heat transfer fluid
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DOI：
10.1016/j.enconman.2014.07.017
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发表时间：
2014-11
影响因子：
10.4
通讯作者：
Mario Biencinto;L. González;E. Zarza;L. Díez;Javier Muñoz-Antón
中科院分区：
文献类型：
--
作者：
Mario Biencinto;L. González;E. Zarza;L. Díez;Javier Muñoz-Antón
世界上大多数商业抛物面槽式发电厂在太阳场中使用合成油作为换热流体。然而，价格合理的合成油面临着一些挑战，如易燃性、环境毒性和约400℃的温度限制。作为替代，本工作建议使用加压氮气作为导热流体。为了分析该技术的可行性，对含氮装置和常规合成油装置进行了比较。在这两种情况下，都使用了50兆瓦抛物线槽式工厂作为参考，这些工厂的储热能力为6小时。在TRNsys仿真软件中，建立了包括太阳场、蓄热系统和功率块在内的各个电厂的性能模型。本文还介绍了太阳场的规格、设计和尺寸，并解释了每种型号所采用的基本操作策略。这两个年度模拟都是根据同一地点--阿尔梅里亚(西班牙)和气象数据进行的。计算结果表明，相同收集面积的抛物面槽型电厂，无论采用氮气还是合成油作为换热工质，均可获得相似的年净发电量。
The majority of commercial parabolic-trough plants in the world operate with synthetic oil as heat transfer fluid in the solar field. However, the synthetic oils that are available at affordable cost present some challenges such as their flammability, environmental toxicity and a temperature limitation of around 400 °C. As alternative, this work proposes the use of pressurized nitrogen as heat transfer fluid. In order to analyze the feasibility of this technology, a comparison between a plant with nitrogen and a conventional plant with synthetic oil has been carried out. In both cases, 50 MWeparabolic-trough plants with 6 h of thermal storage are used as reference. A performance model including the solar field, the thermal storage system and the power block has been developed for each plant in the TRNSYS simulation software. This paper also describes the specifications, design and sizing of the solar field and explains the basic operation strategy applied in each model. Both annual simulations have been performed considering the same location, Almería (Spain), and meteorological data. In summary, the results show that similar net annual electricity productions can be attained for parabolic-trough plants with the same collection area using either nitrogen or synthetic oil as heat transfer fluid.