Exergetic assessment and exergoeconomic diagnosis of a sugarcane plant in northeastern Brazil Online publication date: Wed, 25-Jan-2023
by Edmilson José da Silva Júnior; Carlos Marlon Silva Santos; Markus Antonio de Oliveira Porangaba; Rafael Alves de Oliveira; Adriano da Silva Marques
International Journal of Exergy (IJEX), Vol. 40, No. 1, 2023
Abstract: The increase in industrial needs increased the demand for fuels, electricity and the growth of climatic effects. This study performs an exergoeconomic evaluation in a sugar, ethanol and electricity production plant located in the Northeast of Brazil. The objective is to identify thermoeconomic inefficiencies, exergy destruction and efficiencies, determine the costs of exergy flows and a step by step of exergoeconomic diagnosis using the SPECO method. The results show the greatest inefficiencies presented in boiler 1 (48 MW, 28%), boiler 2 (43 MW, 25%) and boiler 3 (31 MW, 18%). The production of steam costs R$63.88 for each GJ of energy. The total cost of exergy destruction in the boilers is R$3,808 per hour of operation which means about 84% of all exergy destroyed in the plant. The exergoeconomic diagnosis concludes that the equipment that needs optimisation primarily is the deaerator (5,904% rk) and the condenser (1,674% rk).
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