1 MWth Oxyfuel Combustion Test FacilityBen Goh, Power Technology

“Recent Developments in CCS”Coal Research Forum – Combustion Division meeting17th April 2007, Imperial College London

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E.ON UK’s 1 MWth Combustion Test Facility (CTF)

Commissioned 1993Located at Power TechnologyTime-temperature scaledFuel flexible

Coal, biomass, oil, Orimulsion, gas, others

Full combustion stagingOverfire airReburnFlue gas recycle

Highly instrumented and controllableOther capabilities added

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Oxyfuel combustion

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RFSC Project RFS-PR-02003 : “ASSOCOGS”

“Assessment of Options for CO2 Capture and Geological Sequestration”

Start date January 2004

Project co-ordinator E.ON UK

Partners Aristotle University of ThessalonikiCentre For Research and Technology HellasCERECOIMCG InternationalUniversity of NottinghamIVD Stuttgart

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RFSC Project RFS-PR-02003 : “ASSOCOGS”

“Assessment of Options for CO2 Capture and Geological Sequestration”

WP1 Co-ordinationWP2 Oxyfuel combustionWP3 Development of ceramic membrane supportWP4 Catalyst development for H2S and NH3 decompositionWP5 Catalytic decomposition membrane reactorWP6 Gas-liquid contact membranesWP7 Modelling and scale-upWP8 Adsorption of CO2 from flue gasWP9 Feasibility of CO2 sequestration with in-situ coalsWP10Comparative assessment of technologies and review of

implications for full-scale plant

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RFSC Project RFS-PR-02003 : “ASSOCOGS”

“Assessment of Options for CO2 Capture and Geological Sequestration”

WP2 Oxyfuel combustion

Review design of CTF for oxyfuel combustionDevelop revised operational proceduresPrepare detailed redesignConstruct and commission CTFRefine operational proceduresPerform parametric testingReview findings and implications

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Original design

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New design

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Oxygen supply

95% purity

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“Bulk stream”

>90% capture efficiency

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“Carrier stream”

Moisture removalMinimise air ingressMinimise gas egress

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“Ballast flow”

Maintain flows through cyclone, fan and stack

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Issues

SafetyGas compositionsMaterials flammability, explosion riskFlame detectionInterlocks

ProcessCoal feedingHeat extractionParticulate removalMaterials – high temperature, O2 purityAir ingressMoisture removal

Control and InstrumentationMass flow – via densityO2 concentration

OperationSwitchoverFeedbackTrips

Others….

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Oxygen storage tank : 4 tonnes (~1 day)

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Bulk stream tower

Bulk stream cyclone Bulk

stream cooler

Bulk stream fan

O2 injection point

Carrier stream chiller

Bulk stream measurement stream

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Carrier stream – first floor

Carrier stream cooler

Carrier stream chiller

Carrier stream ‘knockout’ pot

Bulk stream tap in

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Carrier stream – ground floor

Carrier stream condensate

Carrier stream final cooler

Carrier stream fan

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Test programme

ConditionsO2 enrichment (14 to 28% vol, wet)Excess oxygen (1 to 4% vol, dry)‘Air’ staging (0 to 25% OFA)Fuel type (VM, S, Cl)Trip tests, changeover tests, operation/procedure

RFSC ASSOCOGSKleinkopje coal – combustion

DTI OxyCoal-UKEl Cerrejon and Thoresby – combustion, deposition, corrosion

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Test programme

MeasurementsGaseous emissions – O2, NO, SO2, CO, CO2, othersExtractive sampling – LOI, CO, othersAsh size distributionExtracted water compositionHeat fluxFlue gas temperature – optical pyrometerDepositionSlagging and foulingCorrosion – 50 hour tests

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Preliminary results

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Summary

HistoryRFSC ASSOCOGS project – started

FlowsFuel – 1 MW pulverised coalCarrier stream – cooled, cleaned, dried recirculated flue gasBulk stream – cooled, cleaned, wet recirculated flue gasOxygen – LOXOutput – 5X CO2 (>80%), 3X SO2, 2X CO, 0.5X NO, 0.3X exhaust

MeasurementMass and volume flow => density – bulk and carrier streamsTemperaturesO2 concentration – bulk stream pre- and post-O2 injection

OperationRetains original air stagingO2 enrichment 14 to 28% volExcess oxygen 0 to 4%

ResultsStill coming in…

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Questions?