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Fluidised Bed Gasification of Diverse Biomass Feedstocks and Blends—An Overall Performance Study

Authors :
Sylvie Valin
Serge Ravel
Philippe Pons de Vincent
Sébastien Thiery
Hélène Miller
Françoise Defoort
Maguelone Grateau
Source :
Energies, Vol 13, Iss 14, p 3706 (2020)
Publication Year :
2020
Publisher :
MDPI AG, 2020.

Abstract

The aim of this work is to investigate the fluidised bed gasification of several pure and blended feedstock prepared in the form of pellets: oak bark, two bark/wheat straw blends (85/15 and 50/50 wt%) and lignin residue remaining from bioethanol production. Gasification conditions were defined to be representative of dual fluidised bed ones (steam gasification at 850 °C, followed by air combustion of the char). The cold gas efficiency (77–81%), gas composition and tar content (0.9–2.3 g/kgdaf) are close for the gasification of bark and the two bark/wheat straw blends. For lignin residue, the cold gas efficiency is lower (71%), and the tar content is 9.1 g/kgdaf. The agglomeration propensity is much higher for lignin residue than for the other feedstock. This was put into evidence with in-bed temperature measurements at different levels, and confirmed with post-test size screening of the bed material particles. The 50/50 wt% bark/wheat straw blend seems to undergo defluidisation in combustion, however followed by refluidisation of the bed. These findings were also well correlated with a predictive model for defluidisation.

Details

Language :
English
ISSN :
19961073
Volume :
13
Issue :
14
Database :
Directory of Open Access Journals
Journal :
Energies
Publication Type :
Academic Journal
Accession number :
edsdoj.82878bc4ea5d4ec78e0b5f8e7338cc93
Document Type :
article
Full Text :
https://doi.org/10.3390/en13143706