Daschner, Robert

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Engineering Conferences International

Engineering Conferences InternationalECI Digital ArchivesBioEnergy IV: Innovations in Biomass Conversionfor Heat, Power, Fuels and Chemicals ProceedingsSpring 6-11-2013External superheating in biomass power plants withpebble bed regeneratorsRobert DaschnerFraunhofer UMSICHTFollow this and additional works at: http://dc.engconfintl.org/bioenergy_ivPart of the Chemical Engineering CommonsThis Conference Proceeding is brought to you for free and open access by the Proceedings at ECI Digital Archives. It has been accepted for inclusion inBioEnergy IV: Innovations in Biomass Conversion for Heat, Power, Fuels and Chemicals by an authorized administrator of ECI Digital Archives. Formore information, please contact franco@bepress.com.Recommended CitationRobert Daschner, "External superheating in biomass power plants with pebble bed regenerators" in "BioEnergy IV: Innovations inBiomass Conversion for Heat, Power, Fuels and Chemicals", Manuel Garcia-Perez,Washington State University, USA Dietrich Meier,Thünen Institute of Wood Research, Germany Raffaella Ocone, Heriot-Watt University, United Kingdom Paul de Wild, Biomass &Energy Efficiency, ECN, The Netherlands Eds, ECI Symposium Series, (2013). http://dc.engconfintl.org/bioenergy_iv/23© Fraunhofer UMSICHT BioEnergy IV11 June 2013Otranto, ItalyRobert DaschnerEXTERNAL SUPERHEATING IN BIOMASS POWER PLANTS WITH PEBBLE BED REGENERATORFraunhofer UMSICHT© Fraunhofer OUTLINE1. Background2. Principle3. Pebble Bed Regenerator4. Thermodynamic Model5. Results6. Conclusion and Outlook© Fraunhofer UMSICHT Folie 3Our motivation … Energy conversion and storageRaw- and functional materials© Fraunhofer UMSICHT Folie 4Background – Biomass power plantExternal Superheating in Biomass Power PlantsImage Sources: www.bildarchiv-hamburg.de, www.muellverbrennung-delitzsch-nein.de© Fraunhofer UMSICHT Folie 5 Considered fuels:biomass (except wood), domestic waste, sewage sludge, RDF Limited efficiency due to corrosion High temperature chloride corrosion:Limited steam parameters of  ca. 450 °C at 50-70 bars (Biomass)  ca. 400 °C at 40 bar (WtE) Still high costs for maintenance due to corrosion effectsBackgroundExternal Superheating in Biomass Power PlantsFeedstockFeedstockFluegasBoiler© Fraunhofer UMSICHT Folie 6PrincipleExternal Superheating in Biomass Power Plants Diversion of hot flue gas out of the boiler (ca. 700 – 800 °C) Regenerative heat transfer to ambient air Superheating of steam with the generated hot air Reduction of corrosion problematic in the air/steam superheaterIncrease in electrical efficiency and flexibilityPebble-Heater© Fraunhofer UMSICHT Folie 7Flue gas inlet / Air outletOuter grid / Cold gridBulk material / Pebble bedInner grid /Hot gridFlue gas outlet /Air inletBulk materialoutletSet-UpQuelle: ATZPebble Bed Regenerator – Pebble-Heater© Fraunhofer UMSICHT Folie 8Hot Flue gasCooled downFlue gasQuelle: ATZFunctionalityPebble Bed Regenerator – Pebble-Heater© Fraunhofer UMSICHT Folie 9Ambient airHot, cleanairQuelle: ATZHot Flue gasCooled downFlue gasFunctionalityPebble Bed Regenerator – Pebble-Heater© Fraunhofer UMSICHT Folie 10BasaltVulcanic rockAlumina OxideDiabaseQuelle: ATZBulk Materials – Overview Pebble Bed Regenerator – Pebble-Heater© Fraunhofer UMSICHT Folie 1105001.0001.5002.0002.500Al2O3 Vulcanic Rock Basalt DiabasBulk density [kg m-3] Heat capacity [kJ (kg*K)-1]Cost/ Volume [€m-3] , Cost/ Weigth[€Mg-1]0102030405060708090100Cost/Volume [€ m-3] Cost/Weigth [€ Mg-1] Bulkdensity[kg m-3], Heatcapacity[kJ (kg*K)-1] ~ 6.300~ 2.700Bulk Materials – Physical conditions and pricesPebble Bed Regenerator – Pebble-Heater© Fraunhofer UMSICHT Folie 12-1Temperatur [K]900800700600500400300200-1 0 1 2 3 4 5 6 7 8 9 1110Spezifische Entropie [kJ/kg*K]Thermodynamic ModelGoals of thermodynamic simulation Thermodynamic dimensioning of the process Design for superheater Turbine characterisation due to changed steam parameters► Increase of energy efficiency due to higher steam parameters© Fraunhofer UMSICHT Folie 13Quelle: ATZThermodynamic ModelImplementation in Matlab®Simulink© Fraunhofer UMSICHT Folie 14Quelle: ATZThermodynamic ModelImplementation in Matlab®Simulink© Fraunhofer UMSICHT Folie 15Quelle: ATZFurnaceSteam generatorFeed water preheatingTurbineSuperheater© Fraunhofer UMSICHT Folie 16Results of Thermodynamic SimulationTemperature Profile at Various Procedural Steps© Fraunhofer UMSICHT Folie 17Results of Thermodynamic SimulationOverall Efficiency© Fraunhofer UMSICHT Folie 18Use of Pebble-Heater in Integrated SystemOutlook© Fraunhofer UMSICHT Folie 19Use of Pebble-Heater in Integrated SystemOutlookGasCharDigestatePowerHeatOilPelletsBiogas plant CHPPyrolysis & ReformingStorage© Fraunhofer UMSICHT Folie 20Use of Pebble-Heater in Integrated SystemOutlookGasCharDigestatePowerHeatOilPelletsBiogas plant CHPPyrolysis & ReformingStoragePebble-Heater© Fraunhofer UMSICHT Folie 21Matlab model for simulation of different types of power plants   different operation modesPebble-Heater usable as Heat Storage in integrated energy systemsη↑External Superheating in Biomass Power PlantsConclusionIncrease in electrical efficiencyVerified in experimental test rigs© Fraunhofer UMSICHT External Superheating in Biomass Power Plants with Pebble Bed RegeneratorThank youfor your kind attentionContactFraunhofer UMSICHTFraunhofer-Instituts für Umwelt-, Sicherheits-und Energietechnik UMSICHTInstite Branch Sulzbach-Rosenberg An der Maxhütte 1D-92237 Sulzbach-Rosenberg / Germany Samir BinderE-Mail: info-suro@umsicht.fraunhofer.de Tel.: 09661-908 410Internet: http://www.umsicht-suro.fraunhofer.de E-Mail: samir.binder@umsicht.fraunhofer.de

External superheating in biomass power plants with pebble bed regenerators

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External superheating in biomass power plants with pebble bed regenerators

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