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A comparison between exergetic and economic criteria for optimizing the heat recovery steam generators of gas-steam power plants

机译：优化燃气-蒸汽发电厂热回收蒸汽发生器的经济标准与经济标准的比较

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摘要

CCGT (Combined-cycle gas turbines) are gaining an increasingly important role in power generation thanks to their high thermal efficiency, low installed cost and ready availability. Increasing natural gas prices, the optimization of CCGT operating parameters is becoming a topic of growing interest. In this paper two different methodologies for optimizing CCGTs are compared. The first aims to minimize the cost per unit of electricity generated, the second to minimize an objective function based on exergoeconomic principles accounting for the costs related with thermodynamic inefficiencies. Optimization results have been obtained considering different CCGT configurations, with single or multi-pressure HRSG (heat recovery steam generators), and varying the gas turbine technology, fuel price and plant capacity factor. A modular approach has been adopted to design a highly effective and flexible HRSG layout, in terms of number of pressure levels and arrangement of heat exchange sections along the flue gas path, together with the corresponding energy, exergy and cost balances, using an "interaction matrix", with nodes between elementary components and towards the surrounding environment.
机译：CCGT（联合循环燃气轮机）因其高热效率，低安装成本和易于使用而在发电中日益重要。天然气价格上涨，CCGT运行参数的优化正成为人们日益关注的话题。本文比较了两种优化CCGT的方法。第一个目标是最大程度地降低单位发电量的成本，第二个目标是根据能效经济学原理考虑热力学效率低下的成本，从而最小化目标函数。考虑到不同的CCGT配置，单压或多压HRSG（热回收蒸汽发生器），以及燃气轮机技术，燃料价格和工厂容量系数的变化，已经获得了优化结果。已采用一种模块化方法来设计高效，灵活的HRSG布局，包括压力水平的数量和沿烟道的换热段的布置以及相应的能量，火用和成本平衡，并使用“交互作用”矩阵”，并在基本组件之间指向周围环境。

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