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首页> 外文期刊>Applied thermal engineering: Design, processes, equipment, economics >Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods
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Exergy destruction analysis of solar tower aided coal-fired power generation system using exergy and advanced exergetic methods

机译：利用能级和高级能级方法的太阳能塔式燃煤发电系统的能级破坏分析

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摘要

The solar tower aided coal-fired power generation system (STCG) is based on a solar tower field and a conventional coal-fired power plant. Solar thermal energy is used to generate high-temperature and pressure steam to work in the coal-fired power plant. Indirect solar power generation and coal energy conservation goals can be achieved under this arrangement. The paper conducts a conventional and an advanced exergetic analysis of a 1000 MWe STCG. Exergy distribution of the system, exergy efficiency of each component and exergy destruction construction have been analyzed. Conventional exergetic analysis method has been used for exergy flow and loss distribution of STCG, whereas the advanced exergetic analysis method has been applied to exergy destruction of components, including endogenous and exogenous exergy destruction. These two methods complement each other and reveal the causes of exergy destruction in STCG. Results indicate that boiler and solar tower field systems are the components with the lowest exergy efficiency (53.5% and 26.0%, respectively). Total exergy losses of these two components account for more than 85% of all exergy losses of STCG. Exergy destruction of components is caused mainly by thermal performance of these components. Based on the degree of system and component association, the component ratio of endogenous and exogenous exergy destruction is different. Exogenous exergy destruction is directly proportional to the association degree. Connection complexity between a solar tower field and a coal-fired power plant system is the simplest, and 99.9% of solar tower exergy destruction is produced by the solar tower field itself. The results of this paper indicate that the boiler and solar tower field should be analyzed in detail when designing STCG systems. Before optimizing the system integration, thermal performance of components should be improved. Doing so, more energy from solar and coal can be converted to electricity, guiding the design and optimization of real demonstrators. (C) 2016 Published by Elsevier Ltd.
机译：太阳能塔辅助的燃煤发电系统（STCG）基于太阳能塔场和传统的燃煤电厂。太阳能用于产生高温高压蒸汽，以在燃煤电厂工作。通过这种安排可以实现间接的太阳能发电和煤炭节能目标。本文对1000 MWe STCG进行了常规和高级的能动分析。分析了系统的火用分布，每个组件的火用效率和火用破坏构造。常规的能值分析方法已用于STCG的能值流和损失分布，而高级能值分析方法已用于组件的能值破坏，包括内源性和外源性能值破坏。这两种方法相辅相成，揭示了STCG的本能破坏原因。结果表明，锅炉和太阳能塔现场系统的火用效率最低（分别为53.5％和26.0％）。这两个组成部分的总火用损失占STCG所有火用损失的85％以上。组件的火用破坏主要是由这些组件的热性能引起的。根据系统和组件关联的程度，内源性和外源性本能破坏的成分比率是不同的。外源火用的破坏直接与关联度成正比。太阳塔场和燃煤发电厂系统之间的连接复杂度是最简单的，并且99.9％的太阳塔火用破坏是由太阳塔场本身产生的。本文的结果表明，在设计STCG系统时应详细分析锅炉和太阳能塔领域。在优化系统集成之前，应提高组件的热性能。这样做，可以将来自太阳能和煤炭的更多能量转换为电能，从而指导实际示威者的设计和优化。 （C）2016由Elsevier Ltd.出版

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