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Underground
CoalGasification
Hans Bruining & Karl-Heinz Wolf
Delft University of Technology, Department of Geotechnology,
Mijnbouwstraat 120, 2628 RX, Delft - The Netherlands.
T: +31 (0) 1527 86029, F: +31 (0) 1527 81189
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EC-presentation Brussels, 29-11-2006
IntroductionIntroduction
Hannah,Hannah, WyWy, USA, USA
ElEl TremedalTremedal ,,
SpainSpain
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IntroductionIntroduction
Difference betw een burning
thick seams and thin seams
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EC-presentation Brussels, 29-11-2006
IntroductionIntroduction
CRIP r eactor
Lateral extensionreactor
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EC-presentation Brussels, 29-11-2006
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
BoswinkelBoswinkel ConceptConcept
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EC-presentation Brussels, 29-11-2006
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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EC-presentation Brussels, 29-11-2006
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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Zone 2,3: Thermal Compaction and Permeability
Autoclave: Grain aggregate compaction during heating experiments
Maximum heating: up to 1200 C.
Maximum confining stress: 11 MPa
Measured are Pressures andExpansion
Calculated are bulk/constrained
modulus, creep rates, porosityand permeability
Rubble grain size representsthe lower end, which isavailable in a coal fire. i.e.2-5 mm
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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Overburden zone (1,2): Thermal Expansion, Shrinkage
and Permeability.
Shrinkage converted to porosity and permeability by using a power law relation forporosity and permeability
Shr
inkage
andp
oros
ity
(-)
Porosity change
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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Domain TemperatureReconstruction UsingXRD
Seventy four temperaturespecific minerals arerecognized in various
types of overburdenrocks, which incombinations specify the
maximum domaintemperature undervarious redox conditions
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Results
It is possible to understand underground coal fires and also possible to find ways to utilize them
InjectionInjection
ProductionProduction
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The accumulated volumetric strain of a coal fire at 40 mdepth. The - symbols refer to the domains
FLAC:Maximum subsidence at
the slope: 0.85 m .
Creep with temperaturedependent creep rates.Maximum subsidence of0.63 m, 3 m from theburning coal.
Most of the subsidence isattributed to compaction ofthe rubble zone
Volume reduction causes apermeability reductionfrom the initial 10-8 m2
down to 10-10
m2
Slope
FLAC compaction result for 40 m deep coal fire, 6 m rubble zone
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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Utilization of Underground Coal Fires (1996)
Idealized situation, as presented in 1996 in Tayuen China,the first moment where this study came into view
: Exploration
: Utilization
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Department of Geotechnology
POB 5028, 2600 GA Delft - The Netherlands.
Tel. #31(0)1527.86029.
Contact : k.h.a.a.wolf@tudel ft.nl
Department of Geotechnology, Dietz Laboratory
QUESTIONS
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EC-presentation Brussels, 29-11-2006
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
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EC-presentation Brussels, 29-11-2006
Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour
9090ss
ElEl TremedalTremedal, Spain, Spain 700 m700 m
New ZealandNew Zealand -- shallow UCGshallow UCG
KrabiKrabi mine, Thailandmine, Thailand ca. 350 mca. 350 m
Beijing, ChinaBeijing, China Shallow UCGShallow UCG
Under planning/developmentUnder planning/development
U.K.U.K.
ChinaChina
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