Mass and Heat Integration in Ethanol Production Mills for Enhanced Process Efficiency and Exergy-Based Renewability Performance

Autor(es)

Silva Ortiz, Pablo A. ^{[1, 2]} ; Maciel Filho, Rubens ^[1] ; Posada, John ^[2]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Chem Engn, Lab Optimizat Design & Adv Proc Control LOPCA, BR-13083852 Campinas, SP - Brazil

^[2] Delft Univ Technol, Fac Appl Sci, Dept Biotechnol, NL-2629 HZ Delft - Netherlands

• Tipo de documento: Artigo Científico
• Fonte: PROCESSES; v. 7, n. 10 OCT 2019.
• Citações Web of Science: 0

Resumo

This paper presents the process design and assessment of a sugarcane-based ethanol production system that combines the usage of both mass and heat integration (pinch analysis) strategies to enhance the process efficiency and renewability performance. Three configurations were analyzed: (i) Base case: traditional ethanol production (1G); (ii) mass-integrated (1G2G); and (iii) mass and heat-integrated system (1G2G-HI). The overall assessment of these systems was based on complementary approaches such as mass and mass-heat integration, energy and exergy analysis, exergy-based greenhouse gas (GHG) emissions, and renewability exergy criteria. The performances of the three cases were assessed through five key performance indicators (KIPs) divided into two groups: one is related to process performance, namely, energy efficiency, exergy efficiency, and average unitary exergy cost (AUEC), and the other one is associated to environmental performance i.e., exergy-based CO2-equation emissions and renewability exergy index. Results showed a higher exergy efficiency of 50% and the lowest AUEC of all the systems (1.61 kJ/kJ) for 1G2G-HI. Furthermore, the destroyed exergy in 1G2G-HI was lower by 7% and 9% in comparison to the 1G and 1G2G cases, respectively. Regarding the exergy-based GHG emissions and renewability performance (lambda(index)), the 1G2G-HI case presented the lowest impacts in terms of the CO2-equivalent emissions (94.10 gCO(2)-eq/MJ products), while lambda(index) was found to be environmentally unfavorable (lambda = 0.77). However, lambda(index) became favorable (lambda > 1) when the useful exergy of the byproducts was considered. (AU)

• Processo FAPESP: 17/03091-8 - Avaliação técnico-econômica e ambiental das tecnologias de biorrefinaria
• Beneficiário: Pablo Andrés Silva Ortiz
• Linha de fomento: Bolsas no Brasil - Pós-Doutorado
• Processo FAPESP: 17/16106-3 - Avaliação técnico-econômica e ambiental das tecnologias de biorrefinaria
• Beneficiário: Pablo Andrés Silva Ortiz
• Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Pós-Doutorado