This work presents a pilot-scale investigation aimed at assessing the feasibility and reliability of biomass pellet gasification. Wood sawdust and sunflower seeds pellets were tested in a 200kW downdraft gasifier operating with air as gasifying agent. The gasification of pelletized biomass led to rather high and unstable pressure drops, reducing the gasifier productivity and stability. Furthermore the generation of fine residues compromised the operation of wet ash removal systems. On the other hand, good syngas compositions (H 2 17.2%, N 2 46.0%, CH 4 2.5%, CO 21.2%, CO 2 12.6%, and C 2H 4 0.4%), specific gas production (2.2-2.4Nm 3kg -1) and cold gas efficiency (67.7-70.0%) were achieved. For these reasons pelletized biomass should be considered only as complementary fuel in co-gasification with other feedstock. © 2012 Elsevier Ltd.
Gasification of pelletized biomass in a pilot scale downdraft gasifier
SIMONE, MARCO;BARONTINI, FEDERICA;NICOLELLA, CRISTIANO;TOGNOTTI, LEONARDO
2012-01-01
Abstract
This work presents a pilot-scale investigation aimed at assessing the feasibility and reliability of biomass pellet gasification. Wood sawdust and sunflower seeds pellets were tested in a 200kW downdraft gasifier operating with air as gasifying agent. The gasification of pelletized biomass led to rather high and unstable pressure drops, reducing the gasifier productivity and stability. Furthermore the generation of fine residues compromised the operation of wet ash removal systems. On the other hand, good syngas compositions (H 2 17.2%, N 2 46.0%, CH 4 2.5%, CO 21.2%, CO 2 12.6%, and C 2H 4 0.4%), specific gas production (2.2-2.4Nm 3kg -1) and cold gas efficiency (67.7-70.0%) were achieved. For these reasons pelletized biomass should be considered only as complementary fuel in co-gasification with other feedstock. © 2012 Elsevier Ltd.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
