Exergoeconomic Analysis for a Two-Shaft Industrial Gas Turbine Engine

Abstract

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.

Thermal performance analysis of gas turbine engines based on different compressor configurations

“…Three common outcomes were determined in from these studies: (a) thermodynamically, the combustion chamber, then the hot section components, and finally the cold section was determined to be the most important components, (b) the GT configuration significantly impacted the product cost, and (c) the technical options will be unique depending on the type of GT to improve the costeffectiveness. Almutairi et al, 22 also conducted a thermodynamic analysis on a triple-shaft areoderivative GT engine and along with its unique features of excellent operational flexibility to meet electricity demands and reduced speed to minimize efficiency reduction. The authors pointed out that combustion chamber inefficiency can be reduced adding an air preheater.…”