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Thermo-economic modeling of an atmospheric SOFC/CHP cycle: an exergy based approach

机译：大气SOFC / CHP循环的热经济模型：基于火用的方法

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摘要

Sustainability is one of the challenging issues in electricity production systems. Recently, solid oxide fuel cell (SOFC) has been suggested for use in combined heat and power (CHP) systems. This application is introduced as a promising environmentally-friendly system according to the thermodynamic and electrochemical models. In this paper, an atmospheric SOFC/CHP cycle was analysed based on integrating exergy concepts, energy and mass balance equations. In this regard, a zero-dimensional energy and mass balance model was developed in engineering equation solver (EES) software. Two dimensionless parameters (the exergetic performance coefficient (EPC) for investigating the whole cycle, and exergetic efficiency for investigating the exergy efficiency of the main component of this cycle) were applied. Results show that efficiencies of the system have been increased substantially. The electrical efficiency, total efficiency and EPC of this cycle were ～54%, ～79% and ～58% respectively. Moreover, the CO_2 emission is 19% lower than when compared with a conventional combined power cycle fed by natural gas. In addition, a dynamic economic evaluation was performed to extract the most sensitive parameters affecting the outputs: electricity sales price (ESP), equipment purchase cost and fuel cost. Furthermore, an electricity production cost of ～125 $ MW.h~(-1) was attributed to our model, resulting in yet further cost reduction for widespread applications of this cycle.
机译：可持续性是电力生产系统中具有挑战性的问题之一。最近，已建议将固体氧化物燃料电池（SOFC）用于热电联产（CHP）系统。根据热力学和电化学模型，此应用程序被介绍为一种有前途的环保系统。在本文中，通过结合火用概念，能量和质量平衡方程对大气SOFC / CHP循环进行了分析。在这方面，在工程方程求解器（EES）软件中开发了零维能量和质量平衡模型。应用了两个无量纲参数（用于研究整个循环的能效性能系数（EPC）和用于研究该循环主要成分的火用效率的能效）。结果表明，该系统的效率已大大提高。该循环的电效率，总效率和EPC分别为〜54％，〜79％和〜58％。此外，与天然气供气的传统联合动力循环相比，CO_2排放量降低了19％。此外，还进行了动态经济评估，以提取影响输出的最敏感参数：电力销售价格（ESP），设备购买成本和燃料成本。此外，我们的模型归因于约125 $ MW.h〜（-1）的电力生产成本，从而进一步降低了该循环的广泛应用的成本。

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