Exergetic analysis of various types of geothermal power plants
Exergetic analysis of various types of geothermal power plants
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DOI：
10.1016/j.renene.2009.07.023
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发表时间：
2010-01-01
期刊：
影响因子：
8.7
通讯作者：
Yari, Mortaza
中科院分区：
文献类型：
--
作者：
Yari, Mortaza
根据现有的调查，已经表明伊朗北部和西北部省份具有巨大的地热潜力，其中一些地方的温度达到240摄氏度。为了更好地开发这些可再生资源，有必要对该地区进行研究。因此，本文的目的是在对高温地热资源进行火用分析的基础上，对不同的地热发电厂概念进行比较研究。本研究考虑的循环是使用简单有机朗肯循环（ORC）的二元地热发电厂，使用ORC与内部热交换器（IHE）的二元地热发电厂，使用蓄热式ORC的二元循环，使用蓄热式ORC与IHE的二元循环，单闪式地热发电厂，双闪式地热发电厂和闪式-二元联合发电厂。对于每一个循环，必须建立一个热力学模型。使用文献中的可用数据进行模型验证。在火用分析的基础上，进行了对比研究，确定了最佳循环配置。从第二定律效率、火用破坏率和第一定律效率的角度讨论了每个循环的性能。介绍了不同地热发电厂概念之间的比较以及确定效率的许多方法。最大第一定律效率与以R123为工质的IHE的ORC有关，计算结果为7.65%。相比之下，基于能量输入的第一定律效率表明，以IHE和R123为工质的再生式ORC为二元循环的效率最高（15.35%）。同时，以R123为工质的闪蒸二元体系的第一定律效率最高，为11.81%。2009爱思唯尔有限公司版权所有。
Based on available surveys, it has been shown that Iran has substantial geothermal potential in the north and north-western provinces, where in some places the temperature reaches 240 degrees C. In order to better exploit these renewable resources, it is necessary to study this area. Thus, the aim of this paper is a comparative study of the different geothermal power plant concepts, based on the exergy analysis for high-temperature geothermal resources. The considered cycles for this study are a binary geothermal power plant using a simple organic Rankine cycle (ORC), a binary geothermal power plant using an ORC with an internal heat exchanger (IHE), a binary cycle with a regenerative ORC, a binary cycle with a regenerative ORC with an IHE, a single-flash geothermal power plant, a double-flash geothermal power plant and a combined flash-binary power plant. With respect to each cycle, a thermodynamic model had to be developed. Model validation was undertaken using available data from the literature. Based on the exergy analysis, a comparative study was done to clarify the best cycle configuration. The performance of each cycle has been discussed in terms of the second-law efficiency, exergy destruction rate, and first-law efficiency. Comparisons between the different geothermal power plant concepts as well as many approaches to define efficiencies have been presented. The maximum first-law efficiency was found to be related to the ORC with an IHE with R123 as the working fluid and was calculated to be 7.65%. In contrast, the first-law efficiency based on the energy input into the ORC revealed that the binary cycle with the regenerative ORC with an IHE and R123 as the working fluid has the highest efficiency (15.35%). Also, the maximum first-law efficiency was shown to be given by the flash-binary with R123 as the working fluid and was calculated to be 11.81%. (C) 2009 Elsevier Ltd. All rights reserved.