Please use this identifier to cite or link to this item:
Title: Modeling, simulation and optimization of flashed-steam geothermal power plants from the point of view of noncondensable gas removal systems
Authors: Yıldırım Özcan, Nurdan
Advisors: Gökçen Akkurt, Gülden
Publisher: Izmir Institute of Technology
Abstract: Geothermal fluids contain noncondensable gases (NCGs) at various amounts. The presence of NCGs in geothermal steam results with a dramatic decrease in net power output increasing condenser pressure and total auxiliary power consumption. Hence, NCGs should be withdrawn by a gas removal equipment to improve the performance of geothermal power plants (GPPs). The flashed-steam GPPs (single-flash, double-flash) are a relatively simple way to convert geothermal energy into electricity when the geothermal wells produce a mixture of steam and liquid. The primary aim of the Thesis is to model and develop a code to simulate flashed-steam GPPs to examine the thermodynamic and economical performance of NCG removal systems, which are major concerns at planning and basic design stages of GPPs. The model is validated comparing model output with Kizildere GPP output, classified as deterministic and static. The model is simulated to identify the effects of input variables which are NCG fraction, separator pressure, condenser pressure, wet bulb temperature, interest rate, tax rate, O&M cost ratio and electricity sales price. Among the variables, NCG fraction is the most significant parameter affecting thermodynamic performance and profitability of flashed-steam GPPs. The net power output and overall exergetic efficiency of singleflash GPP is decreased 0.4% for compressor system (CS), 2.2% for hybrid system (HS), 2.5% for reboiler system (RS) and 2.7% for steam jet ejector system (SJES) by 1% increase in NCG fraction. Based on thermodynamic and economical simulations, SJES, HS and CS can be recommended to be used for a NCG fraction range of 0-2%, 2-10% and >10%, respectively. Furthermore, thermodynamic performance of single-flash plants can be improved by adding second flash by 45.5-127.9%.
Description: Thesis (Doctoral)--Izmir Institute of Technology, Mechanical Engineering, Izmir, 2010
Includes bibliographical references (leaves: 143-152)
xx, 157 leaves
Appears in Collections:Phd Degree / Doktora

Files in This Item:
File Description SizeFormat 
T000839.pdfDoctoralThesis2.82 MBAdobe PDFThumbnail
Show full item record

CORE Recommender

Page view(s)

checked on May 6, 2024


checked on May 6, 2024

Google ScholarTM


Items in GCRIS Repository are protected by copyright, with all rights reserved, unless otherwise indicated.