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Effect of process parameters on bioelectricity production, energy and environmental performance

Journal of Sustainable Development of Energy, Water and Environment Systems
ARTICLE IN PRESS (volume, issue and page numbers will be assigned later)
DOI: http://dx.doi.org/10.13044/j.sdewes.d6.0237
Claudia Cristina Sanchez Moore, Laíse Anton, Fernando Henrique Cardoso, Luiz Kulay
Chemical Engineering Department – Polytechnic School of the University of São Paulo

Abstract

This study evaluates the energy and environmental performance of a cogeneration system operating simultaneously with bagasse and straw in a Rankine cycle. Different process conditions, defined in terms of boiler operating pressure, moisture content and straw addition rate, were analyzed. The combination of these parameters led to the elaboration of one hundred and twenty-five analysis scenarios. The energy profile was based on the Energy Performance Indicator, which is the ratio between the exported electricity and the intrinsic energy of biomass consumed for its generation, and the environmental assessment was performed in terms of Climate Change. Scenario modeling was developed according to the conceptual framework proposed by the Life Cycle Assessment technique with a 'from cradle-to-gate' coverage. Results indicate that the best energy and environmental performances (Energy Performance Indicator = 0.193 and 688 kgCO2eq/MWh) were obtained with the highest pressure (100bar) and addition rate (50%), and the lowest moisture content (10%). Moreover, straw moisture has more influence on the system environmental performance than its addition rate.

Keywords: Sugarcane biomass, cogeneration, energy performance, Life Cycle Assessment, bioelectricity

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