Eventos Anais de eventos
ENCIT 2022
19th Brazilian Congress of Thermal Sciences and Engineering
ANALYSIS OF ELECTRICITY GENERATION AS A FUNCTION OF ENVIRONMENTAL CONDITIONS FROM THE BOTTOMING CYCLE ENERGY METHODOLOGY
Submission Author:
Emerson Paulino dos Reis , MG , Brazil
Co-Authors:
Emerson Paulino dos Reis, Felipe Raul Ponce Arrieta
Presenter: Emerson Paulino dos Reis
doi://10.26678/ABCM.ENCIT2022.CIT22-0047
Abstract
This article aimed to develop an analysis of the electric power generation as a function of environmental conditions based on a calculation methodology for cogeneration in a bottoming cycle. The analysis considers: the trigeneration, with the possibility of cold production through absorption and/or compression chillers; the curve of energy demands of the process; the storage of thermal energy in the form of cold; as well as local environmental conditions such as altitude, ambient temperature, and humidity. The calculations that were done includes: the electric power generated; the chiller performance coefficients; the commercialization of electricity and carbon credits. In addition, was assessed the environmental gains with the reduction of CO2eq emissions. The methodology was applied in a small steel mill whose average monthly production is 5,500 tons of pig iron from charcoal, and it is in the state of Minas Gerais, Brazil. The time analyzed period was one year and a Rankine cycle with ƞCP = 20% for electricity generation was considered. The results show that the variables of environmental conditions, ambient temperature and altitude are the ones that most impact the electric power generation of. Considering an altitude at 725 m and analyzing the values of electric power generation for a typical summer and winter day the results are as follow. In a summer day the electric power at 6 h was 1,323 kW, for 21.6 °C and 96 % of ambient temperature and relative humidity respectively and, at 18 h was 1,303 kW, for 30.5 °C and 53 % of ambient temperature and relative humidity respectively. In a winter day the electric power at 6 h was 1,364 kW, for 12.5 °C and 87 % of ambient temperature and relative humidity respectively and, at 18 h was 1,334 kW, for 23.8 °C and 37 % of ambient temperature and relative humidity respectively. This way it is possible to concluded that at lower ambient temperatures higher values of electric power are produced while the relative humidity does not influence the generated power.
Keywords
Bottoming cycle, cogeneration, energy efficiency, industrial processes
