Performance analysis of organic Rankine cycle for power recovery from geothermal energy

GUO Cong; DU Xiaoze; YANG Lijun; YANG Yongping

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Performance analysis of organic Rankine cycle for power recovery from geothermal energy

Thermal Power Generation Vol. 43, Issue 6, Pages: 11-16(2014)

更新时间：2025-09-28

- Performance analysis of organic Rankine cycle for power recovery from geothermal energy
- 作者机构：
  
  华北电力大学电站设备状态监测与控制教育部重点实验室
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM616
- Published：2014
- 稿件说明：
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GUO Cong, DU Xiaoze, YANG Lijun, et al. Performance analysis of organic Rankine cycle for power recovery from geothermal energy[J]. Thermal Power Generation, 2014, 43(6): 11-16.
DOI：

GUO Cong, DU Xiaoze, YANG Lijun, et al. Performance analysis of organic Rankine cycle for power recovery from geothermal energy[J]. Thermal Power Generation, 2014, 43(6): 11-16. DOI：

摘要

针对中低温地热能发电

建立基于蒸发器夹点温差位置的有机朗肯循环(ORC)系统性能分析模型。以R245fa、R290和R600a工质为例

计算并分析了在不同蒸发器热源侧出口温度下

系统输出功率、单位面积的输出功率、蒸发压力、热效率和火用效率随蒸发器热源侧出口温度的变化规律

以及不同工质的最佳运行工况。研究结果表明:随着热源出口水温的升高

存在一个最佳蒸发器热源侧出口温度

使得循环的输出功率和有回热装置时的单位面积输出功率最大;对于≤135℃的地热能

更适用于亚临界ORC;回热器的加入可增加系统循环效率

但其对循环最优蒸发压力几乎无影响。

Abstract

The analytical model was established for organic Rankine cycle(ORC)system for power generation from geothermal energy.Three typical types of organic working fluids were selected for the ORC performance analysis.At different heat source outlet temperatures

change laws of the work output

work output per unit area

evaporation pressure

thermal efficiency and exergy efficiency with the heat source outlet temperature were investigated.Moreover

the optimal operation condition for each working fluid was obtained.The results show that

the work output(with and without internal heat exchanger(IHX))and work output per unit area(with IHX)reached the maximum value with the variation of heat source outlet temperature.For geothermal with temperature below 135 ℃

subcritical ORC was more suitable for power generation than supercritical ORC.The introduction of IHX can increase the thermal efficiency and exergy efficiency

but has little effect on cycle optimum evaporation pressure.

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