KALINA CYCLE FOR WHR IN CEMENT INDUSTRIES
Mayra Diniz da Silveira1; Felipe Raul Ponce Arrieta1
1 Pontifical Catholic University of Minas Gerais
doi:10.20906/CPS/COB-2015-0647
Resumo
The simple Kalina cycle (KC) has been studied to perform energy cogeneration from the waste heat recovery (WHR) in preheater cement industries. The preheater available energy was considered from a 5000 tc/day cement production capacity. A thermodynamic and simplified exergoeconomic models were developed in Engineering Equation Solver (EES) software. Several cycle thermodynamic parameters as ammonia-water mixture concentration and turbine operating pressure were wide-ranging in order to maximize the cycle thermal efficiency aiming to minimize the electricity generation cost. The temperature-entropy KC schematics were shown for different best results aiming to understanding which is the set of parameters that target the maximum KC performance. The produced power, the thermal cycle efficiency, the exergetic efficiency and the exergoeconomic electricity specific cost were plotted for the different ranges of the independent parameters. The optimum results for a range specific investment price were presented. The main conclusions indicate that allow the variation range of the studied parameters the turbine operating pressure caused a variation greater than the ammonia-water mixture concentration in the KC performance. Also was possible to conclude that the KC is competitive with the existing electricity prices. In this case the KC proved to be applicable for WHR in the cement industry.
Palavras-chave: Kalina cycle; waste heat recovery; cement industry; energy cogeneration