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Techno-economic assessment of a Kalina cycle driven by a parabolic Trough solar collector

机译：抛物槽太阳能集热器驱动的Kalina循环的技术经济评估

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Recently, with decreasing oil resources and environmental issues associated to use of fossil fuels, solar thermal power plants have attracted much attention among researches mainly due to zero emission and huge fuel savings they bring about. In this study, a small scale parabolic Trough collector and a thermal storage tank along with an auxiliary heater are coupled to a Kalina cycle to study the performance of the system throughout the year, both thermodynamically and economically. To examine the effect of solar collectors in the system, the model is compared to a fuel driven Kalina cycle. Results show that in 5 months of the year, the solar fraction is more than 50%. The exergy analysis reveals that the main source of destructions are solar collectors (more than 50% of total) and vapor generator. The solar collectors and vapor generator have an improvement potential of 69% and 65%, respectively. The Kalina cycle is responsible for a minor portion of total exergy destruction, thus more investment should be put on solar collectors. Economic analysis shows that, under design conditions, solar Kalina cycle has a levelized cost of electricity of 0.4274 $/kW h which is higher compared to that of fuel driven cycle with 0.3113 $/kW h. On the other hand, the solar system has a yearly fuel saving of almost 40,000 kg/year (natural gas) which is half of fuel driven cycle and can save more than 100 tons of carbon dioxide. Also, solar fraction and daily mean sun to electricity exergy efficiency of 67.71% and 5.24% are obtained, respectively, for July. Also, the thermal storage tank has a vital role on maintaining the stable working condition of Kalina cycle. To find the effect of key parameters on the performance and economic of solar system, a parametric study has been done: The results show that ammonia mass fraction variation has the most effect on exergy efficiency, solar fraction and levelized cost of electricity. This paper provides the reader to examine the performance of a small scale solar plant from exergetic view point and to estimate the overall costs associated to the system. (C) 2015 Elsevier Ltd. All rights reserved.
机译：近来，随着石油资源的减少以及与化石燃料的使用相关的环境问题，太阳能火力发电厂引起了研究的广泛关注，这主要是由于它们实现了零排放和节省大量燃料。在这项研究中，一个小型抛物槽收集器和一个储热罐以及一个辅助加热器与卡利纳循环耦合，以研究该系统全年的热力学和经济性能。为了检查系统中太阳能收集器的效果，将模型与燃料驱动的Kalina循环进行了比较。结果表明，一年中的5个月中，太阳比例超过50％。火用分析表明，破坏的主要来源是太阳能收集器（占总数的50％以上）和蒸汽发生器。太阳能收集器和蒸汽发生器的改进潜力分别为69％和65％。 Kalina循环只占总能干破坏的一小部分，因此应在太阳能集热器上投入更多的投资。经济分析表明，在设计条件下，太阳能卡利纳循环的平均电力成本为0.4274美元/千瓦时，高于燃料驱动循环的0.3113美元/千瓦时。另一方面，太阳系每年可节省近40,000公斤/天（天然气）的燃料，这是燃料驱动循环的一半，可节省100多吨二氧化碳。另外，7月的太阳分数和日均太阳电能效率分别为67.71％和5.24％。此外，储热罐在保持Kalina循环的稳定工作状态方面也起着至关重要的作用。为了找到关键参数对太阳能系统性能和经济性的影响，已进行了一项参数研究：结果表明，氨质量分数变化对火用效率，太阳能分数和平均电力成本影响最大。本文为读者提供了从精力充沛的角度检查小​​型太阳能发电厂的性能并估算与该系统相关的总成本的信息。 （C）2015 Elsevier Ltd.保留所有权利。

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