Alkali-Feldspar as a Catalyst for Biomass Gasification in a 2-MW Indirect Gasifier
Artikel i vetenskaplig tidskrift, 2017

The aim of this work was to investigate the potential of alkali-feldspar ore [(K, Na)AlSi3O8] as an alternative bed material for indirect gasification of biomass. Experiments conducted in the Chalmers 2-MW gasifier confirmed that alkali-feldspar could withstand stringent fluidizing conditions. Moreover, this material showed strong promise for promoting the water gas shift reaction and reforming higher hydrocarbons, in particular tars. This activity was enhanced by time-on-stream in the indirect gasifier, and the gas and tar yields were higher than for activated olivine or bauxite used in the same unit. SEM-EDX analysis revealed that the Observed activity of alkali-feldspar was due to the formation of active ash layers on the feldspar particles (consisting principally of Ca, Mg, K, and Na) that originated from the woody fuel. At some point, the feldspar showed capacity to transport oxygen from the boiler to the gasifier. Thus, an optimal level of bed regeneration would benefit the reforming reactions in the gasifier, while creating the possibility to improve fuel conversion in the boiler through increased access and distribution of oxygen, which is transported by the bed material throughout the boiler.

steam

reduction

fluidized-bed gasification

producer gas

Energy & Fuels

syngas

combustion

gas shift reaction

gasification

tar elimination

Engineering

ilmenite

olivine

Författare

Nicolas Berguerand

Chalmers, Energi och miljö, Energiteknik

Teresa Berdugo Vilches

Chalmers, Energi och miljö, Energiteknik

Energy & Fuels

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

Vol. 31 2 1583-1592

Drivkrafter

Hållbar utveckling

Styrkeområden

Energi

Ämneskategorier

Kemiska processer

Bioenergi

DOI

10.1021/acs.energyfuels.6b02312