Comparative Techno-Economic and Exergetic Analysis of Circulating and Dual Bed Biomass Gasification Systems
Pablo Silva Ortiz (University of Campinas, TU Delft - BT/Biotechnology and Society)
Simon Maier (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Ralph Uwe Dietrich (Deutsches Zentrum für Luft- und Raumfahrt (DLR))
Adriano Pinto Mariano (University of Campinas)
Rubens Maciel Filho (University of Campinas)
John Posada (TU Delft - BT/Biotechnology and Society)
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Abstract
In this work, the techno-economic and exergy analyses of two gasification technologies with integration into heat and power combined cycles are presented: i). Circulating fluidized bed (CFB) and ii). Dual fluidized bed (DFB) systems. As feedstock, lignocellulosic biomass (sugarcane bagasse, SCB) was considered. The gasification process of the fluidized-bed systems (circulating and dual bed) and the syngas conversion were performed using Aspen Plus® software. The process design includes biomass drying and gasification, syngas cleaning, combustion, power generation, and heat recovery. The SCB-DFB system has the lowest irreversibility rate and, as a result, the highest overall performance and power generation (achieving 32% in the gasification system and 53% of exergy efficiency when coupled with the combined cycle). From the techno-economic assessment, the SCB-DFB system has the lowest total production costs per unit of energy. Hence, the dual fluidized bed systems could be a more competitive technology for the agro-industrial sector to generate power from lignocellulosic materials.
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