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Techno-economic performance comparison of enhanced geothermal system with typical cycle configurations for combined heating and power

机译：具有典型加热和电力典型周期配置增强地热系统的技术经济性能比较

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摘要

The hot dry rock contains abundant heat, which can be exploited by enhanced geothermal systems, being one of the most commonly used geothermal power generation solutions. To enhance the power generation efficiency and utilization of geothermal resource, four combined heating and power systems are presented for geothermal fluids temperature ranging from 120 degrees C to 220 degrees C and dryness between 0 and 0.9. The operating parameters of four enhanced geothermal systems are respectively optimized, and the system performances are analyzed and compared. The results showed that the system performances as well as the optimal operating conditions varied with the temperature and dryness of the geothermal fluid. The double-flash organic Rankine cycle based combined heating and power system exhibited the highest power generation efficiency under geothermal fluid temperature and dryness coupling. The double-flash organic Rankine cycle based combined heating and power system had the highest techno-economic performance in the practical application, which the levelized cost of electricity was 0.0831 $/kWh and the payback period was 9.43 years. The organic Rankine cycle subsystem using n-Octane showed preferable power generation performance, while using n-Decane showed preferable techno-economic performance. Moreover, the enhanced geothermal system configuration and its operating parameters should match with actual local geothermal fluid conditions and the double-flash organic Rankine cycle based combined heating and power system was recommended in most cases.
机译：热干岩含有丰富的热量，可以通过增强的地热系统利用，是最常用的地热发电解决方案之一。为了提高地热资源的发电效率和利用，提供四种组合加热和动力系统，用于从120℃至220℃的地热流体温度呈现0和0.9之间的干燥度。分别优化了四种增强地热系统的操作参数，分析了系统性能并进行了比较。结果表明，该系统性能以及最佳操作条件随着地热流体的温度和干燥而变化。双闪光有机朗肯循环的组合加热和电力系统在地热流体温度和干燥耦合下发出了最高的发电效率。基于双闪光有机朗肯循环的组合加热和电力系统在实际应用中具有最高的技术经济性能，其中电力调整成本为0.0831 $ / kWh，回收期为9.43年。使用N-辛烷的有机朗肯循环子系统显示出优选的发电性能，同时使用N-癸烷显示出优选的技术经济性能。此外，在大多数情况下，增强地热系统配置及其操作参数应与实际的局部地热流体条件和双闪光有机朗肯循环的组合加热和电力系统匹配。

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