EXERGY ANALYSIS OF A GAS TURBINE PERFORMANCE WITH EFFECT CYCLE TEMPERATURES

To examine the degradation of energy during a practice, the production of entropy and the loss of work opportunities, exergy is analyzed. This analysis provides an alternative plan to ensure superior performance of a power plant. This study performed an exergetic analysis for a Baiji plant with a gas-turbine of capacity 159-MW. Each component of the system was tested in accordance with the laws of mass and energy conversion. The aspects under consideration were the quantitative exergy balance for the entire system and for each component, respectively. At different temperatures, rate of irreversibility of system components, efficiency of exergy and the efficiency flaws were highlighted for each component and for the whole plant. The exergy flow of a material is classified into the groupings of thermal, mechanical and chemical exergy in this study and a stream of entropy-production. Fuel oil of low heating value of 42.9 MJ/kg was used as the fuel. The evaluation addressed the question of how the fluctuations in cycle temperatures influence the exergetic efficiency and exergy destruction in the plant. The rate of exergy destruction in the turbine was around 5.4% whereas that in the combustion chamber was about 36.4%. When a 14°C rise was done in the temperature, exergy efficiency for the combustion chamber and the turbine was calculated to be 45.43% and 68.4%, respectively. According to the results of the study, the combustion chamber and turbine are found to be chief means of irreversibilities in the plant. Also, it was identified that the exergetic efficiency and the exergy destruction are considerably dependent on the alterations in the turbine inlet temperature. On the basis of these results, recommendations are presented for advancement of the plant.

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