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Title:
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Co-gasification of coal and biomass waste in entrained-flow gasifiers: phase 1: preliminary study
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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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1-4-1997
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ECN report number:
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Document type:
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ECN-C--97-021
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ECN publication
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Number of pages:
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Full text:
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71
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Download PDF
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Abstract:
The use of coal, for large scale power production, leads to a growingenvironmental concern. Co-gasification of coal with biomass waste materials
is an interesting intermediate technology to bridge present power production
processes based on fossil fuels, and future desired processes based on
renewable energy sources. Further, co-gasification ensures that coal
utilisation can be maintained on a sustainable basis, and it improves the
eco-acceptability of coalfired power production. The main objective of this
preliminary study, which is part 1 of a total study consisting of two
separate parts, is to investigate the technical feasibility of
co-gasification of coal and biomass waste materials in IGCC plants, based on
entrained-flow gasification, for large scale power production. The results of
part 2, which consists of the experimental screening of selected biomass
fuels concerning their behaviour at entrained-flow gasification conditions,
will be published in a separate report. To answer to the objective of this
study a number of tasks have been formulated, of which the results are
presented in this report. These results are: an inventory of commercially
available entrained-flow based IGCC processes, an inventory of Dutch biomass
waste materials available for power production, an overview of experiences
gained already with the co-gasification of biomass materials, an overview of
adaptations that have to be made to commercial available entrained flow based
IGCC processes so that they can be used for co-gasification, and some
advanced IGCC processes that can be used for co-gasification purposes by
which is indicated which measures have to be taken and/or research has to be
performed to solve current bottle-necks. On the basis of the information
gathered in this study, it became known that a lot of experimental work still
has to be performed to solve process bottle-necks, and to get a better
understanding of the (co-)gasification behaviour of biomass waste materials
under entrained-flow conditions. For the co-gasification of coal with a
variety of biomass waste materials, wet feeding system based 'fully'
integrated IGCC processes seem to be preferable on the first sight, over dry
feeding system based IGCC processes. To confirm this hypothesis, technical,
economic, and environmental assessment studies have to be performed. The
experimental screening of selected biomass fuels, in the second part of this
study, will be limited to dry feeding system based entrained-flow
gasification processes, because the results of these experiments could be of
direct importance for the Shell-based coal-fired IGCC demonstration plant of
Demkolec in Buggenum, Netherlands. 43 refs.
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