Performance Analysis of Single-Flash Geothermal Power Plants : Gas Removal Systems Point of View
Performance Analysis of Single-Flash Geothermal Power Plants : Gas Removal Systems Point of View
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单闪发地热发电厂的性能分析：瓦斯去除系统的观点
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
Gülden Gökçen
中科院分区：
文献类型：
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作者：
N. Özcan;Gülden Gökçen
不凝性气体（NCGs）是地热流体的天然成分，对地热发电厂（GPP）的性能影响很大。因此，应该从过程中去除NCGs以优化工厂的热力学效率。gpp需要大容量的NCG去除系统，在总厂成本和辅助功耗中所占的比重也很大。世界各地普遍使用的单闪式GPP是一种相对简单的方法，当地热井产生蒸汽和液体的混合物时，将地热能转化为电能。在这项研究中，对四种不同的气体去除系统（蒸汽喷射器、混合系统、压缩机和再沸器系统）在不同的NCG含量下对单闪式GPP进行了详细的火用分析，并对功率输出进行了优化。结果表明，在NCG分数影响有限的情况下，压缩机系统是最有效、最稳健的系统。另一方面，NCG分数的增加对蒸汽喷射器的影响很大，因为蒸汽喷射器的动力蒸汽流量与NCG分数直接相关。因此，这个分析表明他们是最坏的情况。由于LRVP的性能介于压缩机和蒸汽喷射器之间，因此其效率更高，因此混合动力系统对NCG分数的变化反应较晚。
Non-condensable gases (NCGs) are natural components of geothermal fluids and can affect the performance of a geothermal power plant (GPP) significantly. Therefore, the NCGs should be removed from the process to optimise the thermodynamic efficiency of the plant. GPPs require large capacity NCG removal systems and also occupies large portion in its total plant cost and auxiliary power consumption. The single-flash GPP, which is commonly used throughout the world, is a relatively simple way to convert geothermal energy into electricity when the geothermal wells produce a mixture of steam and liquid. In this study, a detailed exergy analyses of a single-flash GPP is conducted for four different gas removal systems (steam jet ejectors, hybrid systems, compressors and reboiler systems) at various NCG contents, and the power output is optimised. The obtained results show that the compressor system is the most efficient and robust system where the influence of the NCG fraction is limited. On the other hand, steam jet ejectors are highly affected by increasing NCG fraction since motive steam flowrate to the steam jet ejectors are directly related to NCG fraction. Thus this analysis shows them to be the worst case. The hybrid system responds late to the change in NCG fraction because the LRVP is more efficient since its performance lies between compressors and steam jet ejectors.