期刊
ENERGY
卷 62, 期 -, 页码 46-61出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.energy.2013.05.010
关键词
Exergy; Exergetic cost; Sugarcane; Ethanol Enzymatic hydrolysis
资金
- CNPq for the master and researcher fellowships [556212/2010-0, PQ304820/2009-1]
- FAPESP for the post-PhD fellowship [2011/05718-1]
- FINEP [FINEP - FUNCAMP No. 01/06/004700]
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [11/05718-1] Funding Source: FAPESP
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.
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