Influence of in-bed catalysis by ash-coated olivine on tar formation in steam gasification of biomass
Artikel i vetenskaplig tidskrift, 2018

The use of catalytic bed materials has become a state-of-the-art solution to control the concentration of tar in fluidized bed biomass steam gasifiers. Ash-coated olivine is commonly applied as bed material, owing to its relatively high catalytic activity towards tar species. However, the mechanisms and conversion pathways influenced by the ash-coated olivine when applied as an in-bed catalyst are still not well understood. The present work aims at proving that the ash-layered olivine prevents the formation of biomass-derived tar at an early stage of their formation. Tests with olivine at different stages of activation and at different temperatures are carried out in the Chalmers 2-4MWth DFB gasifier. Detailed characterization of the tar and light hydrocarbon fractions are presented and discussed in relation to the sources of aromatic species. It is concluded that the ash-coated olivine prevents the formation of aromatic tar species by promoting the steam reforming of early tar precursors. Gas-phase interactions of the early tar precursors and bed material contribute to the tar reduction observed. The results indicate that olivine interferes the cyclization routes involving C2H2 and C3 hydrocarbons.

cracking

reforming

catalysis

gasification

biomass

reaction pathways

tar

olivine

Författare

Teresa Berdugo Vilches

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik, Energiteknik 2

Martin Seemann

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Henrik Thunman

Chalmers, Rymd-, geo- och miljövetenskap, Energiteknik

Energy & Fuels

0887-0624 (ISSN) 1520-5029 (eISSN)

Vol. 32 9 9592-9604

Ämneskategorier

Energiteknik

Kemiteknik

Styrkeområden

Energi

Infrastruktur

Chalmers kraftcentral

DOI

10.1021/acs.energyfuels.8b02153

Mer information

Senast uppdaterat

2018-10-23