Mehmet KOPAÇ, N. Özgür AYDIN, Zafer ŞAHİN

The investigation of increasing of the efficiency in the power plant with gas-solid fuels by exergy analysis

Bu çalışmada, Demir-Çelik Fabrikasındaki güç santraline enerji ve ekserji analizi uygulanmıştır. Santral, eskive yeni olmak üzere iki kısımdan oluşmaktadır. Bu kısımlar birbirleriyle entegre olarak çalışmaktadır. Bu çalışmada,her bir ünitenin enerji kayıpları ve tersinmezlikleri enerji ve ekserji analizi uygulanarak belirlenmiştir. Ayrıca,üniteler tersinmezliklerine göre karşılaştırılmış ve verim artırıcı bazı önemli öneriler yapılmıştır. Mevcut santraldekitoplam tersinmezliği 6054 kW olan üç basınç düşürücünün (PDD1, PDD2, PDD3) kaldırılması ve yerine bir turbo- jeneratör (TG4) konulması önerilmiştir. Yapılan hesaplamalar sonucunda, önerilen bu santralin mevcut santrale göregenel (1. Kanun) verim ve genel ekserji verim artışları sırasıyla % 2.27 ve 2.21 olarak belirlenmiştir

Gaz-katı yakıtlı güç santralinde verim artışının ekserji analizi kullanılarak incelenmesi

In this study the energy and exergy analysis have been applied to the power plant in the Iron and SteelWorks Co. This plant consist of two parts, which could be described as old and new sections. These components worktogether as an integrated power plant. In this work, the irreversibility rates and energy losses of each units have beendetermined separately by energy and exergy analysis. Also, units have been compared by irreversibility rates andsome considerable suggestions have been made to improve efficiency. It is suggested to remove three pressurereduction units (PDD1, PDD2, PDD3), have a total irreversibility rate of 6054 kW, from the existing plant andreplaced by a turbo-generator (TG4). Calculated results showed that the increments of overall thermal ( or first law)efficiency and overall exergy (or second law) efficiency of suggested plant were 2.27 and 2.21 %, respectively.

PDF

___

Aljundi, I.H., Energy and exergy analysis of a steam power plant in Jordan”, Applied Thermal Engineering, 29, 324–328, 2009.
Ameri, M., Ahmedi, P. and Hamidi, A., Energy, exergy and exergoeconomic analysis of a steam power plant: A case study, Int. J. Energy Res. 33(5), 499–512, 2009.
Balli, O., Aras, H. and Hepbasli, A., Exergoeconomic analysis of a combined heat and power (CHP) system, Int. J. Energy Res. 32, 273–289, 2008.
Bejan, A., Fundamental of exergy analysis, entropy generation minimization and the generation of flow architecture, Int. J. Energy Res. 26(7), 1-43, 2002.
Brammer, N.R. and Hessami, M.A., Evaluation of a process simulator for modelling and analysis of Rankine cycle steam power plants, Int. J. Exergy, 5 (2), 177-192, 2008.
Cihan, A., Hacıhafızoğlu, O. and Kahveci, K., Energy- exergy analysis and modernization suggestions for a combined-cycle power plant, Int. J. Energy Res. 30, 115-126, 2006.
Dincer, I. and Al-Muslim, H., Thermodynamic analysis of reheat cycle steam power plants, Int. J. Energy Res. 25, 727-739, 2001.
Dinçer, I., Technical, environmental and exergetic aspects of hydrogen energy systems, Int. J.Hydrogen Energy 27, 265-285, 2002.
Erdem, H.H., Akkaya, A.V., Cetin, B., et. al., Comparative energetic and exergetic performance analyses for coal-fired thermal power plants in Turkey, Int..J. Thermal Sciences,. 48(11), 2179-2186, 2009.
Kopac, M., Applying of energy and exergy analysis on an existing power plant, Turkish J. Thermal Sci.and Tech. 20(3-4), 3-7, 2000.
Kopac, M. and Zemher, B., Exergy analysis of the steam-injected gas turbine, Int. J. Exergy 1(3), 363-374, 2004.
Kopac, M. and Hilalci, A., Effect of ambient temperature on the efficiency of the regenerative and reheat Çatalağzı power plant in Turkey, Applied Thermal Engineering 27, 1377-1385, 2007.
Kotas, T.J., The exergy method of thermal plant analysis. Krieger Publishing Company, Malabar Florida, 1995.
Modesto, M. and Nebra, S.A., Exergoeconomic analysis of the power generation system using blast furnace and coke oven gas in a Brazilian steel mill, Applied Thermal Engineering, 29, 2127–2136, 2009.
Rosen, M.A. and Dincer, I., Exergoeconomic analysis of power plants operating on various fuels, Appl. Therm. Eng. 23, 643-658, 2003.
Rosen, M.A. and Tang, R., Effect of altering combustion air flow on a steam power plant: Energy and exergy analysis, Int. J. Energy Res. 31, 219-231, 2007.
Rosen, M.A. and Tang, R., Improving steam power plant efficiency through exergy analysis: effects of altering excess combustion air and stack-gas temperature, Int. J. Exergy 5(1), 31-51, 2008.