Improvement potential of a real geothermal power plant using advanced exergy analysis

The main purpose of this paper is to quantitatively evaluate thermodynamic performance of a geothermal power plant (GPP) from potential for improvement point of view. Thus, sources of inefficiency and irreversibilities can be determined through exergy analysis. The advanced exergy analysis is more appropriate to determine real potential for thermodynamic improvements of the system by splitting exergy destruction into unavoidable and avoidable portions. The performance critical components and the potential for exergy efficiency improvement of a GPP were determined by means of the advanced exergy analysis. This plant is the Bereket GPP in Denizli/Turkey as a current operating system. The results show that the avoidable portion of exergy destruction in all components except for the turbines is higher than the unavoidable value. Therefore, much can be made to lessen the irreversibilities for components of the Bereket GPP. The total exergy efficiency of the system is found to be 9.60%. Its efficiency can be increased up to 15.40% by making improvements in the overall components. Although the heat exchangers had lower exergy and modified exergy efficiencies, their exergy improvement potentials were high. Finally, in the plant, the old technology is believed to be one of the main reasons for low efficiencies.

[1]  G. Bodvarsson,et al.  The exergy of thermal water , 1972 .

[2]  Yunus Cerci,et al.  Performance evaluation of a single-flash geothermal power plant in Denizli, Turkey , 2003 .

[3]  George Tsatsaronis,et al.  ON AVOIDABLE AND UNAVOIDABLE EXERGY DESTRUCTIONS AND INVESTMENT COSTS IN THERMAL SYSTEMS , 2002 .

[4]  Mehmet Kanoglu,et al.  Incorporating a District Heating/Cooling System Into an Existing Geothermal Power Plant , 1998 .

[5]  Arif Hepbasli,et al.  Splitting the exergy destruction into avoidable and unavoidable parts of a gas engine heat pump (GEHP) for food drying processes based on experimental values , 2013 .

[6]  Ş. Şimşek,et al.  Geothermal model of Denizli, Sarayköy-Buldan area , 1985 .

[7]  N Razmara,et al.  A simple gas turbine system and co-generation power plant improvement based on endogenous and exogenous exergy destruction , 2010 .

[8]  Majid Amidpour,et al.  New procedure for optimal design and evaluation of cogeneration system based on advanced exergoecono , 2013 .

[9]  Sedat Sisbot,et al.  Exergy analysis of electricity generation for the geothermal resources using organic rankine cycle: Kızıldere‐denizli case , 2013 .

[10]  Gang Xu,et al.  Comprehensive exergy-based evaluation and parametric study of a coal-fired ultra-supercritical power plant , 2013 .

[11]  Mehmet Kanoglu,et al.  Improving the performance of an existing air-cooled binary geothermal power plant : A case study , 1999 .

[12]  Hikari Fujii,et al.  Flash cycle optimization of Sabalan geothermal power plant employing exergy concept , 2012 .

[13]  Ibrahim Dincer,et al.  Performance evaluations of a geothermal power plant , 2011 .

[14]  Recep Ozturk,et al.  Thermodynamic evaluation of Denizli Kızıldere geothermal power plant and its performance improvement , 2005 .

[15]  J. P. Holman,et al.  Experimental methods for engineers , 1971 .

[16]  Tatiana Morosuk,et al.  Conventional and advanced exergetic analyses applied to a combined cycle power plant , 2012 .

[17]  Leyla Ozgener,et al.  Thermodynamics and exergoeconomic analysis of geothermal power plants , 2012 .

[18]  Mortaza Yari,et al.  Exergetic analysis of various types of geothermal power plants , 2010 .

[19]  Adnan Midilli,et al.  MODELING and EXPERIMENTAL STUDY ON DRYING of APPLE SLICES IN A CONVECTIVE CYCLONE DRYER , 2003 .

[20]  Zengliang Gao,et al.  Avoidable thermodynamic inefficiencies and costs in an externally fired combined cycle power plant , 2006 .

[21]  Ryuichi Itoi,et al.  Exergy analysis and optimization of Dieng single-Flash geothermal power plant , 2014 .

[22]  Gang Li,et al.  Organic Rankine cycle performance evaluation and thermoeconomic assessment with various applications part I: Energy and exergy performance evaluation , 2016 .

[23]  Tatiana Morosuk,et al.  Conventional thermodynamic and advanced exergetic analysis of a refrigeration machine using a Voorhees’ compression process , 2012 .

[24]  Sadiq J. Zarrouk,et al.  Efficiency of geothermal power plants: A worldwide review , 2014 .

[25]  Tatiana Morosuk,et al.  Understanding the thermodynamic inefficiencies in combustion processes , 2013 .

[26]  Tatiana Morosuk,et al.  Advanced Thermodynamic Analysis and Evaluation of a Supercritical Power Plant , 2012 .

[27]  Mehmet Kanoglu,et al.  Exergy analysis of a dual-level binary geothermal power plant , 2002 .

[28]  Ibrahim Dincer,et al.  Exergetic performance analysis of Dora II geothermal power plant in Turkey , 2012 .

[29]  Ronald DiPippo,et al.  Second Law assessment of binary plants generating power from low-temperature geothermal fluids , 2004 .

[30]  Arif Hepbasli,et al.  Energy and Exergy Analysis of Kizildere Geothermal Power Plant, Turkey , 2006 .

[31]  Niyazi Aksoy,et al.  Geothermal energy in Turkey: 2008 update , 2009 .

[32]  I. Dincer,et al.  Exergy and exergoeconomic analyses and optimization of geothermal organic Rankine cycle , 2013 .

[33]  Yunus Cerci,et al.  Performance analysis of Germencik Geothermal Power Plant , 2013 .