Eventos Anais de eventos
ENCIT 2016
16th Brazilian Congress of Thermal Sciences and Engineering
PERFORMANCE ANALYSIS OF A COMBINED CYCLE FOR ELECTRICITY GENERATION WITH GAS TURBINE COMPRESSOR INLET AIR COOLING
Submission Author:
Fernando Rodrigues , RS
Co-Authors:
Paulo Roberto Wander
Presenter: Paulo Roberto Wander
doi://10.26678/ABCM.ENCIT2016.CIT2016-0690
Abstract
The increase in demand for electric power generation and the search for greater reliability in the Brazilian energy sector are obtaining great prominence in recent decades. Thermoelectric plants have gained increased attention because they have more flexibility and the possibility of installation near consumption areas, different from hydroelectric plants, which are the main source of electricity generation in Brazil. Thus, to enable the use of non-renewable energy sources with less environmental impact, a model was designed in EES software for the simulation of possible gains in electricity generation and efficiency in a combined cycle through the use of an inlet air cooling system for the gas turbine compressor using a direct expansion mechanical vapor compression refrigeration system. This happens because the performance of the gas turbine operation is greatly influenced by ambient temperature. To validate this model, comparisons were made with actual data collected from the processes of a thermal power plant operating in combined cycle in the metropolitan region of Porto Alegre, Brazil. To simulate the cooling system, technical data from an air conditioner manufacturer were used to generate an equation that calculates the cooling capacity and electric power according to, at the same time, the wet bulb temperature in the evaporator and the dry bulb temperature at the condenser. It was found that adding the cooling to the air entering the gas turbine compressor there is an average increase in overall efficiency of the combined cycle of 1.82% and a power generation increase of 5.37%, attaining 260 MW with the use of Fuel Oil for Electric Turbine (OCTE). This represents, for this plant, a possible increase of more than 70 GWh in annual capacity of electric power generation.
Keywords
Gas Turbine, combined cycle, energy, thermal system
