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Performance analysis and improvement of geothermal binary cycle power plant in oilfield

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Abstract

In order to improve the efficiency of a geothermal power plant, oil wells in the high water cut stage were used as geothermal wells, thereby improving the recovery ratio and economic benefit. A new function that reflects both the technical and economic performances was put forward and used as the objective function. An organic Rankine cycle (ORC) was analyzed through the energetic and exergetic analyses, and the reasons for low efficiency were pinpointed. Results indicate that geothermal water directly transferring heat to the working fluid reduces energy dissipation and increases cycle efficiencies. The net power output with an internal heat exchanger (IHE) is averagely 5.3% higher than that without an IHE. R601a and R601 can be used to replace R123 for geothermal water below 110 °C. Moreover, the modified ORC dramatically outperforms the actual one.

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Authors and Affiliations

  1. Key Laboratory of Efficient Utilization of Low and Medium Grade Energy of Ministry of Education (Tianjin University), Tianjin, 300072, China

    Tai-lu Li  (李太禄), Jia-ling Zhu  (朱家玲) & Wei Zhang  (张伟)

  2. Tianjin Geothermal Research and Training Center, School of Mechanical Engineering, Tianjin University, Tianjin, 300072, China

    Tai-lu Li  (李太禄), Jia-ling Zhu  (朱家玲) & Wei Zhang  (张伟)

Authors
  1. Tai-lu Li  (李太禄)
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  2. Jia-ling Zhu  (朱家玲)
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  3. Wei Zhang  (张伟)
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Corresponding author

Correspondence to Wei Zhang  (张伟).

Additional information

Foundation item: Project(2012AA052804) supported by the National High Technology Research and Development Program of China

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Li, Tl., Zhu, Jl. & Zhang, W. Performance analysis and improvement of geothermal binary cycle power plant in oilfield. J. Cent. South Univ. 20, 457–465 (2013). https://doi.org/10.1007/s11771-013-1507-x

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  • DOI: https://doi.org/10.1007/s11771-013-1507-x

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