Thermodynamic and techno-economic performance comparison of two-stage series organic Rankine cycle and organic Rankine flash cycle for geothermal power generation from hot dry rock

Liu, Qinghua ¹Li, Xuelong ¹Gao, Haiyang ¹Meng, Nan ¹Li, Tailu ¹Gao, Xiang¹

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作者信息

1. Hebei Univ Technol, Sch Energy & Environm Engn, Tianjin Key Lab Clean Energy & Pollutant Control, Tianjin 300401, Peoples R China
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Abstract

To improve the utilization rate of geothermal resource using organic Rankine cycle (ORC), an organic Rankine flash cycle (ORFC) combined with insufficient evaporation and flash process is proposed to reduce the irreversibility of the power generation cycle. The thermodynamic performance and techno-economic performance of ORFC and two-stage series organic Rankine cycle (TSORC) are optimized, respectively. The effects of evaporation temperature, flash temperature and outlet dryness on the performance of two systems are discussed. The results show that with the increase of heat source temperature, the optimal operating condition value of the system increases, which leads to improving the thermodynamic and techno-economic performance significantly. R601a and R601 are the most suitable working fluids for TSORC and ORFC, respectively. The heat exchanger is the main component that causes the exergy destruction of the system, and its improvement potential is the highest in all components. The thermodynamic performance and techno-economic performances of ORFC are better than those of TSORC. The irreversible loss of the system can be reduced by the insufficient evaporation combined with flash separator.

Key words

organic Rankine cycle/Operating conditions/Techno-economic performance/Thermodynamic performance/Exergy destruction

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出版年

2022

Applied thermal engineering

EISCI

ISSN：1359-4311

被引量24

参考文献量44

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