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Title:
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Pressured entrained flow gasification simulator: design, construction and commissioning: executive summary
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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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1-8-1998
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ECN report number:
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Document type:
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ECN-C--98-061
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ECN publication
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Number of pages:
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Full text:
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41
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Download PDF
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Abstract:
To support and ensure a successful introduction of entrained-flowgasification based technologies in general, and a successful operation of the
world's first fully Integrated Gasification Combined Cycle (IGCC)
demonstration plant in Buggenum, Netherlands (Dernkolec plant, 253 MWe) in
particular, the Dutch Ministry of Economic Affairs and the Netherlands Agency
for Energy and the Environment (Novem) decided to initiate an extensive
research programme. The knowledge base on coal conversion, mineral matter
behaviour and trace element emissions in entrained-flow gasification systems
should be advanced through research using adequate, representative lab-scale
test facilities. Starting from existing experimental expertise on combustion
and mineral matter transformation phenomena occurring in pulverised coal
fired boilers, ECN was asked to develop these lab-scale test facilities. In
the present report, the design, construction and commissioning of one of
these facilities, the Pressurised Entrained-Flow Gasification simulator
(PEFG-simulator), are described. The main design considerations for this
facility have been based on an analysis of possible problem areas to be
expected during operation of entrained-flow gasifiers. It is concluded that
many possible problems are related to the fate of the mineral constituents in
the coal, e.g. (1) problems with building up the slag layer and removing the
slag, (2) high/low-temperature fouling and (3) filter blinding and
problematic flyslag handling. In that case, as it is known from studies under
pulverised fuel (pf-)combustion conditions, an accurate simulation of
full-scale conditions in terms of initial particle heating rates and particle
temperatures, and temperature and gaseous environment, histories is crucial.
Therefore, it was decided not to use the isothermal drop tube or
entrained-flow reactor concepts with their limited heating rates and
relatively low initial particle temperatures. Instead, the concept of an
entrained-flow reactor with an Integrated, prernixed and multi-stage flat
flame gas burner, as applied in the earlier combustion studies, was selected.
By feeding different gas mixtures to the different stages, the gas burner can
be used to simulate the high initial heating rates and temperatures, and the
gaseous environment history that the particles experience In an actual
entrained-flow gasifier. In addition, multiple heating sections can be used
to simulate the particle temperature history. This concept has been
translated into a detailed design and the facility has been constructed. The
subsequent commissioning of the facility revealed the necessity of several
technical adjustments and a reconsideration of the safety philosophy.
However, no major problems were encountered, which would threaten the
applicability of the concept. After implementing the technical adjustments
and adopting improved safety procedures, the PEFG-simulator has passed the
final commissioning stage. This means that a unique experimental facility is
available now for lab-scale research towards an improved understanding of
coal conversion phenomena in entrained-flow gasification (and pressurised
combustion) processes. 11 refs.
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