Exergetic analysis of the integrated first- and second-generation ethanol production from sugarcane

Autor(es)

Palacios-Bereche, Reynaldo ^[1] ; Mosqueira-Salazar, Klever Joao ^[2] ; Modesto, Marcelo ^[1] ; Ensinas, Adriano V. ^[1] ; Nebra, Silvia A. ^{[3, 1]} ; Serra, Luis M. ^[4] ; Lozano, Miguel-Angel ^[4]

Afiliação do(s) autor(es)

^[1] Fed Univ ABC CECS UFABC, Ctr Engn Modelling & Social Sci, BR-09210580 Santo Andre, SP - Brazil

^[2] Univ Estadual Campinas, Sch Mech Engn, BR-13083970 Campinas, SP - Brazil

^[3] Univ Campinas NIPE UNICAMP, Interdisciplinary Ctr Energy Planning, Campinas, SP - Brazil

^[4] Univ Zaragoza, Dept Ingn Mecan, Zaragoza 50018 - Spain

• Tipo de documento: Artigo Científico
• Fonte: ENERGY; v. 62, p. 46-61, DEC 1 2013.
• Citações Web of Science: 44

Resumo

This study carried out an exergetic analysis of a proposed ethanol production scheme in which a new process enzymatic hydrolysis of sugarcane bagasse is integrated into the conventional process. Seven cases were evaluated, among them a conventional ethanol production plant without hydrolysis, a conventional plant combined with hydrolysis and hydrolysate concentration by evaporation, and a conventional plant combined with hydrolysis and hydrolysate concentration by the membrane system. Process simulations were performed to evaluate mass and energy balances,, adopting the pre-treatment of sugarcane bagasse by steam explosion, and including an integrated cogeneration system. It was assumed that sugarcane trash and lignin cake, a hydrolysis residue, are available as supplementary fuel. The exergies of streams involved in the process were calculated, along with their exergetic cost. For the conventional process, in which ethanol and surplus electricity are the major products, a second-law efficiency of 28% was found. In the integrated process, with biogas as an additional product, a higher performance in resources management was achieved, with values in the range of 35-37%. (C) 2013 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 11/05718-1 - Produção de biocombustíveis de segunda geração a partir da cana-de-açúcar - Modelagem e avaliação energética e exergética do processo integrado.
• Beneficiário: Reynaldo Palacios Bereche
• Modalidade de apoio: Bolsas no Brasil - Pós-Doutorado