Eventos Anais de eventos
COBEM 2019
25th International Congress of Mechanical Engineering
Thermodynamic Evaluation of Power and Heat Cogeneration Systems Fueled by Biogas
Submission Author:
Thalyta Stefani Amâncio Santiago , SP
Co-Authors:
Ana Elisa Achiles, Thalyta Stefani Amâncio Santiago, José Vicente Dangelo
Presenter: Thalyta Stefani Amâncio Santiago
doi://10.26678/ABCM.COBEM2019.COB2019-0640
Abstract
Environmental concerns as global warming and energy depletion have been motivating the use of renewable energy sources to meet energy requirements. Power and heat cogeneration systems consist of one of the alternative technologies in terms of energy saving and power generation high efficiency. In this work, two configurations of a cogeneration system were studied. In the first one, a topping regenerative gas turbine cycle combined with a steam generation and a bottoming basic organic Rankine cycle while the second one used a bottoming organic Rankine cycle with a reheater. These systems were fueled by biogas to generate a constant net output power of 1000 kW and a quantity of 0.194 kg.s-1 of steam at 506.6 kPa and 433.15 K. Energetic and exergetic performances evaluation were carried out in order to investigate optimum operating conditions. A parametric analysis was also performed varying biogas molar composition; percentage of excess air; compression ratio and air inlet temperature in the combustion chamber. The results showed that the addition of a reheater in bottoming ORC improved both energetic and exergetic system performances, reducing biogas consumption and exergy destruction rate in 4.43% and 7.28%, respectively.
Keywords
Gas Turbine, Organic Rankine Cycle (ORC), thermodynamic analysis
