چكيده به لاتين
Abstract
Reduced efficiency and power due to increased ambient temperature is a major disadvantage in a gas turbine. In other words, a gas turbine can suffer a dramatic reduced reduction in its power and efficiency during hot seasons when the electricity demand is at its peak. Therefore, it is essential to adopt suitable methods for cooling the air entering the gas turbine compressor to recover the lost power. The media system is a major solution for cooling the inlet air to the compressor. A technical and economic survey was conducted in the present study of the media system performances in three different power plants in Iran. To this end, the V94.2 gas turbine was used in the presented sample calculations, and the media cooling methods used at Parand Power Plant (located in the temperate and dry zone), Zavareh Power Plant (located in the hot and dry zone), and Parehsar Power Plant (located in the temperate and humid zone) were selected for our technical and economic evaluations.
First, the performance of the cooling media system was calculated by applying two different methods: 1) correction coefficients in the V94.2 turbine, and 2) the Thermoflow (software). Subsequently, the initial and current costs of the media system were obtained.
The obtained results showed that installing the cooling media system in Parand, Zavareh, and Parehsar Power Plants caused corresponding power increases of 9504, 12,624, and 798 kilowatts per gas turbine in these plants respectively; with efficiency increases of 0.98% and 1.17%, in Parand and Zavareh power plants respectively. In addition, capital return periods of 5 years 2 months, 3 years 2 months, and 44 years were predicted for Parand, Zsavareh, and Parehsar power plants respectively. Considering the low V94.2 turbine efficiency, significant increase in turbine power would result in both Prand and Zavareh power plants.
Keywords: Powerplant, V94.2 gas turbine, inlet air cooling, cooling media system
