wolf bruining underground coal gasification

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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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Difference betw een burning

thick seams and thin seams


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CRIP r eactor

Lateral extensionreactor


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Convection model, cavity development and roof rockConvection model , cavity development and roof rockbehaviourbehaviour

BoswinkelBoswinkel ConceptConcept


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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




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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




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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




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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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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

wolf bruining underground coal gasification

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