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Title:
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Biomass gasification research in fixed bed and fluidised bed reactors
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Author(s):
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Published by:
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Publication date:
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ECN
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1997
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ECN report number:
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Document type:
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ECN-RX--97-011
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Article (scientific)
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Number of pages:
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13
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Published in: Presented at the international conference "Gasification and pyrolysis of biomass", Stuttgart, Germany, April 1997 (), , , Vol., p.-.
Abstract:
A wide variety of biomass types is considered as a fuel for gasification.The exact gasification behaviour for these streams is unknown, which hampers
full-scale implementation. At ECN a package of tools has been developed to
determine gasification characteristics and to evaluate integral gasification
concepts. These tools consist of theoretical models, laboratory equipment and
pilot-scale installations. Attention is focused on supporting the commercial
development of DownDraft Fixed Bed (DDFB) gasification for smaller scale
(1-10 MWth) combined heat and power systems and of Bubbling/Circulating
Fluidised Bed (BFB/CFB) gasification for larger systems (>10 MWth). BFB and
CFB pilot-scale testing is conducted in a 0.7 MWth test facility. The
initial experimental programme is envisaged to consist of test-runs with
short rotation willow, waste wood and roadside grass. It will be conducted in
close cooperation with a main feedstock supplier in the Netherlands. Besides
general operability aspects, fuel gas composition and fuel gas rate,
conversion efficiency, and axial temperature- and pressure profiles will be
determined. DDFB pilot-scale testing is performed in ECN's 0.3 MWth
atmospheric air-blown gasifier. Both pilot-scale installations already have
been operated successfully on wood. The DDFB installation has also been
operated successfully on coal/straw mixtures. With respect to the modelling,
a steady-state reactor model for Bubbling Fluidised Bed (BFB) gasification is
available already, while a steady-state model for CFB gasification is being
developed. In addition, the development of a reactor model for DDFB
gasification is foreseen. The models require a series of empirical input
parameters, which are derived from standardised laboratory-scale tests.
Standardised experimental procedures have been developed to determine these
parameters using, e.g. a lab-scale BFB reactor and a thermogravimetric
analyser. The results of the pilot-scale testing will be used to validate
reactor models. 3 figs., 1 tab., 9 refs.
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