survey of brown coal drying technologies godfrey
TRANSCRIPT
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APPJointMeetingofCleanerFossilEnergyand
PowerGenerationandTransmissionTaskForces
01April
2008
BrownCoalDryingTechnologies
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Leads to higher capital cost
Lower efficiency meanshigher CO2 emissions(more fuel needed per kWh
e
)
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ThebenefitsofdryingbrowncoalThebenefitsofdryingbrowncoal Lowercapitalcostofplants
Higherefficiency(lowerfueluseandCO2emissions)
inoperation
From RWE Powerhttp://www.rwe.com/generator.aspx/rwe-power-icw/property=Data/id=608764/dl-wta-technology.pdf
http://www.rwe.com/generator.aspx/rwe-power-icw/property=Data/id=608764/dl-wta-technology.pdfhttp://www.rwe.com/generator.aspx/rwe-power-icw/property=Data/id=608764/dl-wta-technology.pdf -
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ThewaystodrybrowncoalThewaystodrybrowncoal SteamFluidisedBedDrying
IntegratedDrying
Gasification
DensifiedBrownCoal
MechanicalThermalExpression
HydrothermalDewatering
Others
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SteamfluidisedbeddryingSteamfluidisedbeddrying Thetechnologyinvolvesevaporativedryingofthe
coal
in
a
superheated
steam
fluidised
bed.
ConceptwasinventedbyPotteratMonashUniversityin1985
Developedto
apre
commercial
scale
by
Lurgi
in
Germany.
RWEPowerinGermanyis,byaclearmargin,the
leaderin
steam
fluidised
bed
drying
of
brown
coal.
Threegenerationsofdevelopmentandscaleupoverthepast20years
Enteringfull
commercial
use
in
Germany
and
apre
commercialdemonstrationplannedinVictoria
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IntegrateddryinggasificationIntegrateddryinggasification HRLPtyLtdhasdevelopedand
demonstratedintegrateddryinggasificationcombinedcycletechnology. Successfullytakento10MWpilotscale
demonstrationlevelinLatrobeValley
Nowundertaking
large
scale
demonstration
projectcomprisingtheconstructionandcommissioningofa400MWcombinedcyclecleancoalpowergenerationplantsupplied
by2x200
MW
gasifiers
using
HRLs
IDGCC
Technology.
JointventuringwithHarbinGroupofChinaforthis$750Mprojectthatissupportedwith$100MAustralianGovernmentand$50M
VictorianGovernmentfunding
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DensifiedbrowncoalDensifiedbrowncoal Attritioningofasminedcoaltoproducemoist,
plastic,
fine
grained,
coal
clay that
subsequently
is
airdriedtoalowmoisturecontentcoal ablackcoalequivalent product.
Originallydeveloped
and
patented
by
Melbourne
Universityinthemid1980s
Potentialforrecoveryofwatercontent
Commercialisationof
differing
process/production
techniquesbeingundertakenbyVictoriancompanies.
EnvironmentalCleanTechnologies
LaTrobe
Lignite
Developments
JottEngineering
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http://www.latrobelignite.com.au/images/Process_Flow.pdfhttp://www.latrobelignite.com.au/images/Process_Flow.pdf -
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MechanicalthermalexpressionMechanicalthermalexpression Involvescompressingcoarsecrushedcoal(heatedin
the
range
150
to
200
C
by
condensing
steam)
at
mechanicalpressurestypicallyofabout60bartosqueezethewaterfromthebrowncoal.
1tonne
per
hour
pilot
plant
built
and
tested
in
Melbourne
15tonneperhourdemonstrationplantproject
underway
in
Latrobe
Valley Producesadriedbrowncoalproduct
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HydrothermaldewateringHydrothermaldewatering Wetcoalisheatedunderpressureto250300Cand
the
coal
structure
breaks
down
and
shrinks,
releasing
thewaterasaliquid.
Exergen hasdevelopedanefficient,continuousreactor
for
hydrothermal
dewatering
(HTD)
of
brown
coal Thisreactorandprocesshasbeensuccessfully
demonstratedina4tonneperhour(tph)continuous
pilot
dewatering
plant
in
Tasmania Exergen publiclyannouncedin2006thatithas
partneredwithengineeringcontractorThiessandaluminiumproducerAlcoaofAustraliasAngleseaPowerStationtofurtherscaleup itsHTDreactorandprocesshttp://www.thiess.com.au/__data/assets/pdf_file/0017/10718/Exergen_Press_Release_2006_04_28.pdf
http://www.thiess.com.au/__data/assets/pdf_file/0017/10718/Exergen_Press_Release_2006_04_28.pdfhttp://www.thiess.com.au/__data/assets/pdf_file/0017/10718/Exergen_Press_Release_2006_04_28.pdfhttp://www.thiess.com.au/__data/assets/pdf_file/0017/10718/Exergen_Press_Release_2006_04_28.pdf -
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OtherdryingapproachesOtherdryingapproaches Highspeedgrinding/dryingprocesses
Windhexe technology
Continuousprocessforpressuredewatering
AquEx
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Browncoalisattractive(whendry)Browncoalisattractive(whendry) Thereislotsoflowranked(brown)coalinAustralia,
Germany,China,USAandothercountries. Oftenalowcostprimaryenergyresource
Itshighreactivityisgoodforgasificationandreductantapplications
Itis
used,
or
could
be
used,
in:
Powergeneration Largestapplication,worldwide
Coalto
liquids
Gastoliquids
Mineralsprocessing
Exportquality
brown
coal