Exergy analysis of Gas Turbine Power Station under Different Operation Conditions

The present study aims to assess and investigate the Qayyarah Gas Station in Nineveh City, Iraq's gas turbine power generating system. The gas turbine unit produces a design power of up to a maximum of 125 megawatts under standard conditions, and the operating power of one unit of the station reaches 100 megawatts. The system is made up of a generator, air compressor, and gas turbine that are connected to a single shaft. Based on the direct Joule-Brayton cycle, it performs its duties. The concepts of conservation of mass, first law, and second law were taken into consideration while analysing the exergy of the aforementioned unit. The study's primary goal was to determine how various factors, such as operational load, relative humidity, ambient temperature, and pressure ratio, affect one another. To reproduce the company's data, two programs were employed; the first utilized Aspen HYSYS, while the second used Excel to design the simulation. For that year's simulation, average data from every month of the simulation was used to assess the gas unit's performance. The findings of the simulation showed that the combustion chamber is the main source of energy dissipation and that fuel in the form of chemicals may produce the most energy. According to the findings, the highest energy efficiency of the station was reached in the month of December at a temperature of (17C˚(, about (40.2%), while the maximum available energy efficiency (Exergy) was reached in the month of December at a temperature of (17C˚(, about (33.7%). The lower the external ambient temperature, the greater the station's utility.