A CONCEPTUAL DESIGN OF A GEOTHERMAL COMBINED CYCLE AND COMPARISON WITH A SINGLE-FLASH POWER PLANT FOR WELL NWS-4, SABALAN, IRAN

The Sabalan geothermal area in NW-Iran is a water-dominated field. The calculated parameters indicate that the potential capacity of the NW-Sabalan resource has a mean value of 209 MWe. The average calculated energy density for the whole area is 11 MW/km 2 . Five exploration wells have been drilled. The Ministry of Energy in Iran is planning to build a pilot power plant in order to confirm that a geothermal power plant can be operated in Iran. Simultaneously, there will be drilled fourteen production wells, one exploration well and one injection well. In this report, a model is presented for a single-flash power plant, using well NWS4 as a production well and optimizing the separator pressure with respect to net power output. In addition, a new power generation cycle is proposed which is a combination of a geothermal power plant and a conventional gas turbine power plant. In Iran, gas turbine power plants produce 20% of the electricity. The exhaust from these power plants is, in many cases, not used but could be used to enhance fluid temperatures in the many medium-temperature geothermal fields in Iran. Model is presented for this new cycle using the EES program and calculations done for two scenarios in the model. Finally, some suggestions are made for optimizing the geothermal combined cycle.

[1]  Parlindungan Hendrick,et al.  OPTIMIZATION OF ELECTRICAL POWER PRODUCTION PROCESS FOR THE SIBAYAK GEOTHERMAL FIELD, INDONESIA , 2004 .

[2]  W. Giggenbach.  Geothermal gas equilibria , 1980 .

[3]  M. El-Wakil.  Power Plant Technology , 1984 .

[4]  C. Bromley,et al.  GEOPHYSICAL EXPLORATION OF SABALAN GEOTHERMAL PROSPECTS IN IRAN , 2000 .

[5]  Páll Valdimarsson,et al.  Production of electricity from geothermal heat - efficiency calculation and ideal cycles , 2003 .

[6]  Y. Noorollahi,et al.  Preliminary environmental impact assessment of a geothermal project in Meshkinshahr, NW-Iran , 2003 .

[7]  Review of Resistivity Surveys from the NW Sabalan Geothermal Field, Iran , 2005 .

[8]  Behnam Radmehr.  PRELIMINARY DESIGN OF A PROPOSED GEOTHERMAL POWER PLANT IN NW-SABALAN AREA, AZERBAIJAN-IRAN , 2005 .

[9]  A. L. Austin.  Prospects for advances in energy conversion technologies for geothermal energy development , 1975 .

[10]  Hossein Yousefi Sahzabi.  Application of GIS in the environmental impact assessment of Sabalan geothermal field, NW-Iran , 2004 .

[11]  R. Fournier.  Geochemical and hydrologic considerations and the use of enthalpy-chloride diagrams in the prediction of underground conditions in hot-spring systems , 1979 .

[12]  John Howard Perry,et al.  Chemical Engineers' Handbook , 1934 .

[13]  W. Giggenbach.  Geothermal solute equilibria. Derivation of Na-K-Mg-Ca geoindicators , 1988 .

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

[15]  I. Bogie,et al.  THE MESHKIN SHAHR GEOTHERMAL PROSPECT, IRAN , 2000 .