Gas cleaning, gas conditioning and tar abatement by means of a catalytic filter candle in a biomass fluidized-bed gasifier.
A bench-scale fluidized-bed biomass gasification plant, operating at atmospheric pressure and temperature within the range 800-820 degrees C, has been used to test an innovative gas cleaning device: a catalytic filter candle fitted into the bed freeboard. This housing of the gas conditioning system within the gasifier itself results in a very compact unit and greatly reduced thermal losses. Long term (22h) tests were performed on the gasifier both with and without the catalytic candle filter, under otherwise identical conditions. Analysis of the product gas for the two cases showed the catalytic filtration to give rise to notable improvements in both gas quality and gas yield: an increase in hydrogen yield of 130% and an overall increase in gas yield of 69% - with corresponding decreases in methane and tar content of 20% and 79%, respectively. HPLC/UV analysis was used to characterize the tar compounds.
Rapagnà
Sergio
S
Dipartimento di Scienze degli Alimenti, University of Teramo, 64023 Mosciano S. Angelo, Teramo, Italy. srapagna@unite.it
Gallucci
Katia
K
Di Marcello
Manuela
M
Matt
Muriel
M
Nacken
Manfred
M
Heidenreich
Steffen
S
Foscolo
Pier Ugo
PU
D002384:Catalysis; D004867:Equipment Design; D019544:Equipment Failure Analysis; D005740:Gases / Q000737:chemistry* / Q000302:isolation & purification*; D009754:Nuts / Q000737:chemistry*; D027861:Prunus / Q000737:chemistry*; D012212:Rheology / Q000295:instrumentation*; D013638:Tars / Q000737:chemistry / Q000302:isolation & purification*; D014462:Ultrafiltration / Q000295:instrumentation*
D005740:Gases; D013638:Tars