Análise exergética de uma usina termelétrica a carvão pulverizado

Abstract

Exergy is a thermodynamics concept defined as the maximum theoretical work possible or the minimum work consumed during process by an overall system, consisting of the system and a specified reference environment, that brings this system into equilibrium with its surrondings. The main proposal of an exergy analysis is to facilitate the identification of the main sources of energy losses and find ways for efficiency improvement of a thermodynamics process. This study proposes an exergy analysis of a pulverized coal fired thermal power station based on both First Law of Thermodynamics and Second Law of Thermodynamics for power generation systems. The evaluation of energy and exergy losses for various equipments was made at rated output load. Besides that, the used values of pressure, temperature and mass flow rate come from real and design values of operation. Especific exergy, energy and exergy rate were calculated on Excel software.