Ahmadi Mohammad H, Sadaghiani Mirhadi S, Pourfayaz Fathollah, Ghazvini Mahyar, Mahian Omid, Mehrpooya Mehdi, Wongwises Somchai
Faculty of Mechanical Engineering, Shahrood University of Technology, Shahrood 3619995161, Iran.
Renewable Energies and Environment Department, Faculty of New Sciences and Technologies, University of Tehran, Tehran 1417466191, Iran.
Entropy (Basel). 2018 Jun 22;20(7):484. doi: 10.3390/e20070484.
An exergy analysis of a novel integrated power system is represented in this study. A Solid Oxide Fuel Cell (SOFC), which has been assisted with a Gas Turbine (GT) and Organic Rankine Cycle (ORC) by employing liquefied natural gas (LNG) as a heat sink in a combined power system is simulated and investigated. Initially in this paper, the integrated power system and the primary concepts of the simulation are described. Subsequently, results of the simulation, exergy analysis, and composite curves of heat exchangers are represented and discussed. The equations of the exergy efficiency and destruction for the main cycle's units such as compressors, expanders, pumps, evaporators, condensers, reformers, and reactors are presented. According to the results, the highest exergy destruction is contributed to the SOFC reactor, despite its acceptable exergy efficiency which is equal to 75.7%. Moreover, the exergy efficiencies of the ORC cycle and the whole plant are determined to be 64.9% and 39.9%, respectively. It is worth noting that the rational efficiency of the integrated power system is 53.5%. Among all units, the exergy efficiency of the LNG pump is determined to be 11.7% the lowest exergy efficiency among the other investigated components, indicating a great potential for improvements.
本研究对一种新型集成电力系统进行了火用分析。在一个联合电力系统中，采用液化天然气（LNG）作为热阱，对辅助有燃气轮机（GT）和有机朗肯循环（ORC）的固体氧化物燃料电池（SOFC）进行了模拟和研究。本文首先描述了集成电力系统及其模拟的主要概念。随后，给出并讨论了模拟结果、火用分析以及换热器的复合曲线。给出了压缩机、膨胀机、泵、蒸发器、冷凝器、重整器和反应器等主要循环单元的火用效率和火用损失方程。结果表明，尽管固体氧化物燃料电池反应堆的火用效率达到了75.7%，可接受程度较高，但火用损失最大。此外，有机朗肯循环和整个电厂的火用效率分别确定为64.9%和39.9%。值得注意的是，集成电力系统的合理效率为53.5%。在所有单元中，液化天然气泵的火用效率为11.7%，是其他被研究组件中火用效率最低的，这表明其具有很大的改进潜力。
