Oxy-Fuel Combustion of Coal and Biomass

1. Oxy-Fuel Combustion of Coal and Biomass Maja Bøg Toftegaard, Industrial PhD Anker Degn Jensen, Peter Glarborg, Peter Arendt Jensen Bo Sander (DONG Energy)

2. Presentation Outline • The oxyfuel technology • Project objectives • Literature survey • The experimental setup • Summary

3. Oxyfuel Power Plant • Changes from conventional plant: • Pure O2 • Recirculated flue gas • High CO2, H2O, SO2 in boiler • Combustion characteristics • Corrosion • Ash and deposition compositions www.kjell-design.com

4. Project Objectives Overall objective: • Investigate combustion fundamentals when firing coal and biomass in an oxyfuel atmosphere Specific subjects: • Sulphur in ash and deposits • Decreasing oxygen excess • Co-firing coal with straw

5. Literature Survey • Plant perspectives for retrofit case • Combustion fundamentals • Submitted to the journal Progress in Energy and Combustion Science

6. Experimental Investigations • Setup type: 30 kW swirl burner • Fuels: natural gas, coal, straw • Oxidant: air + mixtures of O2, CO2, N2, NO, and SO2 • Characterisation methods: • online gas analysis of O2, CO2, CO, NO, and SO2 • sampling system for fly ash • deposit probe • advanced diagnostics: FTIR probe (T, conc.) IR CCD camera (particle T)

7. Experimental Results - Example

8. Summary • Oxyfuel combustion promising technology for carbon capture and storage • Several questions still remain to be answered: • Fate of sulphur in boiler • Potential to decrease efficiency penalty by decreasing oxygen excess • Below zero CO2 emissions from utilization of biomass

9. Tak for opmærksomheden/ Thanks for the Attention !