Energy and Exergy Analysis of Sabalan Binary Geothermal Power Plant

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  • JALILINASRABADY Saied
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • ITOI Ryuichi
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • VALDIMARSSON Pall
    Faculty of Engineering and Natural Sciences, University of Iceland
  • FUJII Hikari
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University
  • TANAKA Toshiaki
    Department of Earth Resources Engineering, Faculty of Engineering, Kyushu University

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  • サバランバイナリー地熱発電所のエネルギーとエクセルギー解析

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Abstract

The Sabalan geothermal field in northwest Iran is currently under development. Energy and exergy of waste brine from a designed single flash system were calculated as 54.8 % and 41.4 % of the total available energy and exergy of the produced fluid, respectively. The separated brine could be used as a heat source for a combined power production and district heating system. For a feasibility study of waste heat utilization, a binary plant was selected for power generation in a combined system with the single flash plant. The net power output of the binary plant was calculated to be 17,151 kW. Mathematical models for energy and exergy flows were developed and implemented in Engineering Equation Solver software. The largest exergy destruction for the waste brine occurred at the condenser and evaporator with 12.1 % and 33.4 % of total available exergy destroyed, respectively. The overall exergy and energy efficiencies for the binary plant were 34.4 % and 6.25 %, respectively. A Grassmann diagram of the overall exergy flow illustrates the overall exergy flow of the process. Exergy analysis is a helpful tool for analyzing geothermal plants from the viewpoint of optimum use of produced energy.

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