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Chemical looping reforming of biomass gas

Chemical looping reforming of biomass gas. Teresa Mendiara Project 50566 Supervisors: Peter Glarborg and Anker Jensen. The project. EraNet project: Energy efficient selective reforming of hydrocarbons. CHEC Annual Day, 2009. Eranet consortium:. Chalmers University of Technology.

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Chemical looping reforming of biomass gas

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  1. Chemical looping reforming of biomass gas Teresa Mendiara Project 50566 Supervisors: Peter Glarborg and Anker Jensen

  2. The project EraNet project: Energy efficient selective reforming of hydrocarbons CHEC Annual Day, 2009 • Eranet consortium: • Chalmers University of Technology • Göteborg Energi • S.E.P. Scandinavian Energy Project AB • Technical University of Denmark (DTU)

  3. Objectives Develop innovative methods for tar removal and reforming of hydrocarbons in gasification Tar removal and selective reforming of unwanted hydrocarbons in the product gas with a Chemical Looping Reformer (CLR) CHEC Annual Day, 2009

  4. Chemical Looping Reforming Depleted Air O2,N2 Reformer Gas H2, CO (CO2,H2O) MeO AIR REACTOR FUEL REACTOR Me Air O2,N2 Fuel CnHm(H2O, CO2) CHEC Annual Day, 2009

  5. DTU tasks in the project CHEC Annual Day, 2009 • Study the carbon formation during reforming of hydrocarbons in a CLR by controlled measurements in a laboratory rig • Selection of oxygen carrier and operating conditions for the CLR • Modelling of the formation rate of the carbon

  6. Experimental approach Reducing Oxidizing CHEC Annual Day, 2009 • Use of two different setups: • TGA • Fixed bed flow reactor • Oxygen carrier placed initially in either a porous plate or a crucible and then the gas atmosphere switched from reducing to oxidizing conditions in every cycle

  7. Experimental methodology (I) CHEC Annual Day, 2009 • Several systems: • CH4 (+ H2O) • C7H8 (model tar compound) (+ H2O) • Influence of other gases present in the biomass gasification gas: CO, H2, CO2 • Variables affecting the reducing cycle: • Temperature: 600-800 ºC • Time for the reduction step: 1.5-9 min

  8. CHEC Annual Day, 2009 Experimental methodology (II) • Several reducing/oxidizing cycles (1-13) • In the flow reactor experiments, CO, CO2 (IR) and O2 concentrations (paramagnetic) were measured by a continuous gas analyzer • SEM, EDX and XRD analysis of selected samples are being done to study the possible changes during the reforming process.

  9. Behaviour of the 4 oxygen carriers to: CH4 (+ H2O) C7H8 (model tar compound) (+ H2O) Selection of the 2 most promising materials for CLR CHEC Annual Day, 2009 TGA Results (I)

  10. CHEC Annual Day, 2009 TGA Results (II) Weight-time curves for methane and toluene reforming at different temperatures. Sample Mn40

  11. CHEC Annual Day, 2009 Main Findings • Temperature is the most important variable influencing reactivity and carbon formation. • Decreasing the reduction time reduced the amount of carbon formed. The presence of water also reduced carbon deposition. • Ni40 and Mn40 were selected as possible materials for CLR due to: • High reactivity at different temperatures • Moderate/Low tendency to carbon formation

  12. Acknowledgements CHEC Annual Day, 2009 • Bachelor and Master students who contributed to this project: • Paulo Geraldo • Joakim M. Johansen • Rubén Utrilla

  13. Tak for opmærksomheden/ Thanks for the Attention !

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