On the relevance of thermodynamics to predict the behaviour of inorganics during CO2 gasification of willow wood

Marwa Said (1, 2) , Laurent Cassayre (2) , Jean-Louis Dirion (1) , Xavier Joulia (2) , Ange Nzihou (1)

1 RAPSODEE - Centre de recherche d'Albi en génie des procédés des solides divisés, de l'énergie et de l'environnement
2 LGC - Laboratoire de Génie Chimique

This work is a contribution to the understanding of the behavior of inorganic elements during the gasification process of biomass, with the help of a robust thermodynamic equilibrium calculation methodology. A specific procedure combined with a thorough investigation of available thermochemical databases was developed in order to calculate the behaviour of 23 inorganic elements during CO2 gasification. In parallel, the gasification of willow wood was performed in a laboratory fixed bed reactor, providing the chemical composition of solid residue and major gases. The specificity of the methodology consists in (i) considering an open system to simulate a gas flow in the system (ii) determining the amount of gasification agent added at each calculation step based on experimental measurements of CO2 and CO concentration profiles. One of the main conclusions is that the thermodynamic approach is a relevant and powerful tool since most of the inorganics behavior is correctly reproduced.

Mots clés: CO2 gasification; biomass; inorganic elements; thermodynamics

Domaines: Sciences de l'ingénieur [physics]

Marwa Said, Laurent Cassayre, Jean-Louis Dirion, Xavier Joulia, Ange Nzihou. On the relevance of thermodynamics to predict the behaviour of inorganics during CO2 gasification of willow wood. ESCAPE 2017 - 27th European Symposium on Computer Aided Process Engineering, Oct 2017, Barcelona, Spain. p.2671-2676, ⟨10.1016/B978-0-444-63965-3.50447-5⟩. ⟨hal-01699300⟩