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Effects of two-phase expander on the thermoeconomics of organic double-flash cycles for geothermal power generation

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  • Meng, Dongyu
  • Liu, Qiang
  • Ji, Zhongli

Abstract

The use of a two-phase expander in place of the throttling valve can improve the organic double-flash cycle (ODFC) thermal efficiencies. This work compares the thermoeconomics of a regenerative ODFC (RODFC), an expander-ODFC (EODFC) and a double expander-ODFC (DEODFC). The evaporation and flash temperatures of these cycles are optimized to maximize the net power outputs for geofluid temperatures of 120–180 °C. The results show that the two-phase expander in EODFC leads to the lowest optimal first-stage flash temperature with the highest vapor mass flow rate for the high-pressure turbine. The power generated by the two-phase expanders in DEODFC is less than that generated by the expander in EODFC but the power generated by the turbines is 5.9–8.4% higher. DEODFC produces the maximum net power, followed by EODFC and RODFC for each geofluid temperature. The exergy losses during evaporation are reduced by up to 41% by regeneration in RODFC, EODFC and DEODFC. The two-phase expanders increase the exergy losses during power generation but decrease the losses during throttling and condensation; thus, the exergy efficiency of DEODFC increases to 32.8–46.8%. The levelized cost of electricity for DEODFC is 15–33% lower than for ODFC due to the great increase in the net power output.

Suggested Citation

  • Meng, Dongyu & Liu, Qiang & Ji, Zhongli, 2022. "Effects of two-phase expander on the thermoeconomics of organic double-flash cycles for geothermal power generation," Energy, Elsevier, vol. 239(PD).
    • Handle: RePEc:eee:energy:v:239:y:2022:i:pd:s0360544221025950
    DOI: 10.1016/j.energy.2021.122346
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    2. Vaccari, Marco & Pannocchia, Gabriele & Tognotti, Leonardo & Paci, Marco, 2023. "Rigorous simulation of geothermal power plants to evaluate environmental performance of alternative configurations," Renewable Energy, Elsevier, vol. 207(C), pages 471-483.
    3. Yang, Chengdian & Yi, Fulong & Zhang, Jianyuan & Du, Genwang & Yin, Wei & Ma, Yuhua & Wang, Wei & You, Jinggang & Yu, Songtao, 2023. "Towards high-performance of organic flash cycle through cycle configuration improvement: State-of-art research," Energy, Elsevier, vol. 278(PA).

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