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Accueil du site > Thèmes de recherche > Combustion & systèmes réactifs > 1.7 Multiphase gasification and combustion phenomena > 1.7.3 Gazéification de la biomasse par des procédés allothermiques

1.7.3 Gazéification de la biomasse par des procédés allothermiques

A promising way to convert various biomass resources into new fuels (such as syngas or hydrogen) concerns the gasification of their non-comestible ligno-cellulosic fractions but also of various agricultural, forestry and municipal residues and wastes, including those having high humidity. The syngas produced can be either used as a gaseous fuel in gas engines or gas turbines or mixed with natural gas, or converted into liquid fuels by catalytic processes such as the well known Fischer-Tropsch process. For wet biomass or organic resources, conventional auto-thermal gasification processes are too much energy consuming as it is necessary to dry them prior to their partial oxidation or gasification. Allo-thermal gasification processes consist in aiding the gasification process by some additional external energy source and are alternative technologies that are developed presently. If optimized they may increase the H2/CO ratio in the produced gas, increase its LHV and also help gas cleaning especially abating tars. One such process is plasma aided gasification of liquid bioresources such as bio-oils issuing from the pyrolysis of the original biomass. In the context of the ANR/PNRB project GALACSY (2006-2009), coordinated by CEA Cadarache, ICARE determined the thermo-chemical parameters of a model bio-oil (see §2.1.2 in Thematic Research Group I) and modeled the injection of the bio-oil into the plasma (Bodele, E., Gökalp I., Numerical study of liquid spray formation by interaction between a plasma and liquid Jet. ILASS Europe 2008 Lake Como, Italy 8-10 Septembre 2008).

Another innovative gasification process adapted for wet biomass is hydrothermal decomposition or gasification of biomass in supercritical water. In the context of the ANR/PNRB project SUPERBIO (2008-2010) and the Region Centre project SUPERGAZ (2010-2011), both coordinated by ICARE, several partners including CEA-Marcoule, Veolia, UNGDA, ICMCB of Bordeaux, LaTEP of PAU and CEMHTI and CRMD in Orleans, are characterizing and optimizing this process applied to wet residues of alcohol distillation processes and wet organic municipal waste and also macro-algae. The role of ICARE in these projects is again the determination of the thermo-chemical parameters of model resources such 24 as glucose (see §2.1.2 in Thematic Research Group I) and the observation and analysis of the supercritical gasification processes of various organic resources using the Hydrothermal Diamond Anvil Cell set-up equipped with optical diagnostics, jointly developed with the McGill University, Montreal, Canada (AFF72 ; ACL133-135). This research axis is ongoing and is now aiming to design and optimize a continuous flow pilot reactor in cooperation with the orleanaise partners of ICARE.