Synthesis, Modeling and Exergy Analysis of Atmospheric Air Blown Biomass Gasification for Fischer-Tropsch Process

Authors : S. Spyrakis, K. Panopoulos, E. Kakaras

Pages : 187-192

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Publication Date : 2009-12-01

Article Type : Other

Abstract :The main objective of the present work is to investigate the combination of an atmospheric and a pressurised air blown biomass gasifier towards Fischer-Tropsch (FT) synthesis of second generation biofuels and co-production of power. The complete process was simulated in AspenPlusTM software including sub-models for the gasification, gas cleaning and conditioning as well as for the FT reactor. A sensitivity analysis on exergetic performance was performed mainly examining the recycling of FT-tail gas. For the base case of 80% FT CO conversion without any recirculation, the exergetic efficiency was found to be 34.3% with atmospheric gasification and 30.64% for pressurised gasification. Recirculation of the non-reacted CO, H2 as well as light gas products of the FT-reactor back to the atmospheric gasifier can increase the overall efficiency up to 48.1 %. This paper is an updated version of a paper published in the ECOS'08 proceedings.
Keywords : biomass gasification, Fischer–Tropsch, exergy, AspenPlusTM