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Exergoeconomic analysis for a two-shaft industrial gas turbine engine

Almutairi A., Alhajeri H., Alenezi A., Zedan M., Al-Asousi M.

Mechanics and Mechanical Engineering

2018

Vol. 22, nr 2

379--395

In this work, the performance of a two-shaft industrial gas turbine engine inspired by SGT-750 , one of best technology at Siemens, is analyzed thermodynamically and economically. The modelling and analyzing process for the proposed system was executed through a software package called IPSEpro and validated with manufacturers’ published data. Exergy analysis, based thermodynamics laws with mass conservation, provides valuable information about locations, magnitudes and types of wastes energy in the thermal systems. Exergoeconomic analysis, the amalgamation of exergy with economics, is useful tool to appraise the gas turbine engine cost-effectiveness. The Specific Exergy Costing method is selected in exergoeconomic evaluation because it is the most widely used reported in the literature and provides reliable results. The performance of a gas turbine engine was investigated for different load variation and climatic conditions. The result shows that the main source of irreversibilities take place in the combustion chamber, compressor and high-pressure turbine, respectively, which constitute to about 96 % of total exergy destruction. The exergetic efficiency and exergy loss rate of the proposed system are about 38.4% and 11.8% respectively. The combustion chamber has the highest value of cost (1312.9 $/h) among other components and the source losses may attribute to the component performance. The production cost of the gas turbine engine based on exergoeconomic evaluation is 12.1 US$/GJ.

Exergy and exergo-economic based analysis of a gas turbine power generation system

Mousafarash A., Ameri M.

Journal of Power Technologies

2013

Vol. 93, nr 1

44--51

In this research study, energy, exergy and exergo-economic analysis of Montazer Ghaem gas turbine power plant which is located near Tehran, capital city of Iran is carried out. The results of this study reveal that the highest exergy destruction occurs in the combustion chamber (CC) where the large temperature difference is the major source of the irreversibility and also gas turbine and compressor are the other components followed by the combustion chamber. In addition, the effects of the gas turbine load variations and ambient temperature are conducted to see how system performance changes since the gas turbine is significantly affected by the ambient temperature which leads to a decrease in the net power output. The results of the load variation of the gas turbine show that a reduction in the gas turbine load, results a decrease in the exergy efficiency of the cycle as well as all the components. As it was expected, the effect of an increase in ambient temperature has a negative effect on the exergy efficiency of the cycle so this reason could be enhanced by using the gas turbine air inlet cooling methods. In addition, an exergo-economic analysis is conducted to determine the cost of exergy destruction in each component and to determine the cost of fuel. The results show that combustion chamber has the largest cost of exergy destruction like exergy analysis.