AUTHOR=Silva Ortiz Pablo , Maier Simon , Dietrich Ralph-Uwe , Pinto Mariano Adriano , Maciel Filho Rubens , Posada John TITLE=Comparative Techno-Economic and Exergetic Analysis of Circulating and Dual Bed Biomass Gasification Systems JOURNAL=Frontiers in Chemical Engineering VOLUME=3 YEAR=2021 URL=https://www.frontiersin.org/journals/chemical-engineering/articles/10.3389/fceng.2021.727068 DOI=10.3389/fceng.2021.727068 ISSN=2673-2718 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.