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Steady state simulation and exergy analysis of supercritical coal-fired power plant with CO2 capture

机译：捕集二氧化碳超临界燃煤电厂的稳态模拟和火用分析

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Integrating a power plant with CO2 capture incurs serious efficiency and energy penalty due to use of energy for solvent regeneration in the capture process. Reducing the exergy destruction and losses associated with the power plant systems can improve the rational efficiency of the system and thereby reducing energy penalties. This paper presents steady state simulation and exergy analysis of supercritical coal-fired power plant (SCPP) integrated with post-combustion CO2 capture (PCC). The simulation was validated by comparing the results with a greenfield design case study based on a 550 MWe SCPP unit. The analyses show that the once-through boiler exhibits the highest exergy destruction but also has a limited influence on fuel-saving potentials of the system. The turbine subsystems show lower exergy destruction compared to the boiler subsystem but more significance in fuel-saving potentials of the system. Four cases of the integrated SCPP-CO2 capture configuration was considered for reducing thermodynamic irreversibilities in the system by reducing the driving forces responsible for the CO2 capture process: conventional process, absorber intercooling (AIC), split-flow (SF), and a combination of absorber intercooling and split-flow (AIC + SF). The AIC + SF configuration shows the most significant reduction in exergy destruction when compared to the SCPP system with conventional CO2 capture. This study shows that improvement in turbine performance design and the driving forces responsible for CO2 capture (without compromising cost) can help improve the rational efficiency of the integrated system. (C) 2015 Elsevier Ltd. All rights reserved.
机译：由于在捕集过程中将能量用于溶剂再生，因此将发电厂与CO2捕集集成在一起会导致严重的效率和能源损失。减少与发电厂系统相关的火用破坏和损失可以提高系统的合理效率，从而减少能源消耗。本文介绍了结合燃烧后CO2捕集（PCC）的超临界燃煤电厂（SCPP）的稳态模拟和火用分析。通过将结果与基于550 MWe SCPP单元的新建设计案例研究进行比较，对仿真进行了验证。分析表明，直通式锅炉具有最高的火用破坏力，但对系统的节油潜力影响有限。与锅炉子系统相比，涡轮子系统的火用破坏较小，但对系统的节油潜力具有更大的意义。考虑了以下四种情况的集成SCPP-CO2捕集配置，可通过减少负责CO2捕集过程的驱动力来减少系统中的热力学不可逆性：常规过程，吸收器中冷（AIC），分流（SF）和组合吸收器中冷和分流（AIC + SF）。与具有常规CO2捕集的SCPP系统相比，AIC + SF配置显示出最大的火用破坏降低。这项研究表明，涡轮机性能设计的改进和负责捕获二氧化碳的驱动力（不降低成本）可以帮助提高集成系统的合理效率。 （C）2015 Elsevier Ltd.保留所有权利。

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