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Performance analyses of regenerative organic flash cycles for geothermal power generation

机译：地热发电再生有机闪脉冲循环的性能分析

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摘要

Organic Flash Cycles (OFCs) provide a good temperature match between the heat source fluid and the working fluid; however, the heat loss from the saturated liquid in the flash separator reduces the efficiency. Regeneration can recover much of the heat from the saturated liquid to preheat the working fluid to improve the thermodynamic performance. The interactions between the evaporation and the flash temperatures for an OFC with an internal heat exchanger (OFC + IHE), an OFC with a regenerator (ROFC), a ROFC with an IHE (ROFC + IHE), and a modified OFC (MOFC) are discussed in this study. The evaporation and flash temperatures are simultaneously optimized to obtain the maximum net power outputs for geothermal water temperatures from 120 degrees C to 180 degrees C with a reinjection temperature of 70 degrees C. The optimal flash temperatures for ROFC, ROFC + IHE and MOFC are lower than for the basic OFC (BOFC) due to the limits of the preheat load and the pinch point which result in higher vapor mass flow rates. The relative increases in the net power outputs and the decreases in the evaporator exergy losses by ROFC, ROFC + IHE and MOFC over those for BOFC decrease with increasing geothermal water inlet temperature. MOFC produces the maximum net power that is up to 66.2% higher than for BOFC for a geothermal water inlet temperature of 120 degrees C. However, MOFC requires 51-78% more evaporator area but 13-42% less condenser area than BOFC to generate the same power.
机译：有机闪存循环（OFC）在热源流体和工作流体之间提供良好的温度匹配;然而，闪光分离器中饱和液体的热量损失降低了效率。再生可以从饱和液中恢复大部分热量以预热工作流体以改善热力学性能。用内部热交换器（OFC + IHE）的蒸发和闪光温度与具有再生器（ROFC）的OFC的相互作用，具有IHE（ROFC + IHE）的ROFC和改性的OFC（MOFC）在这项研究中讨论过。同时优化蒸发和闪光温度，以获得从120摄氏度到180℃的地热水温度的最大净功率输出，再注温度为70℃。ROFC，ROFC + IHE和MOFC的最佳闪光温度较低不是由于预热负荷的限制和导致蒸汽质量流量较高的夹点的底部的基本（BOFC）。通过ROFC，ROFC + IHE和MOFC对蒸发器驱动器损失的相对增加以及通过增加地热进水温度的BOFC减少。 MOFC产生的最高净功率高于120摄氏度的热水烃的最高净功率高达66.2％，但是，MOFC需要51-78％的蒸发器面积，但冷凝器面积减少13-42％，比BOFC产生相同的力量。

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  • 来源
    《Energy Conversion & Management》 |2020年第11期|113396.1-113396.13|共13页
  • 作者

    Meng Dongyu; Liu Qiang; Ji Zhongli;

  • 作者单位

    China Univ Petr Coll Mech & Transportat Engn Beijing Key Lab Proc Fluid Filtrat & Separat Beijing 102249 Peoples R China;

    China Univ Petr Coll Mech & Transportat Engn Beijing Key Lab Proc Fluid Filtrat & Separat Beijing 102249 Peoples R China|China Univ Petr State Key Lab Petr Resources & Prospecting Beijing 102249 Peoples R China;

    China Univ Petr Coll Mech & Transportat Engn Beijing Key Lab Proc Fluid Filtrat & Separat Beijing 102249 Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Geothermal power generation; Organic flash cycle; Thermodynamic performance; Optimization; Regeneration;

    机译：地热发电;有机闪存;热力学性能;优化;再生;

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