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Effects of Oxygen Concentration and Coal Composition on Aerosol Chemistry in Oxy Firing

Effects of Oxygen Concentration and Coal Composition on Aerosol Chemistry in Oxy Firing. William J. Morris Dunxi Yu Jost O. L. Wendt Department of Chemical Engineering University of Utah, Salt Lake City, UT 84112. 2010 AIChE Annual Meeting Salt Lake City, Utah November 7-12, 2010.

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Effects of Oxygen Concentration and Coal Composition on Aerosol Chemistry in Oxy Firing

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  1. Effects of Oxygen Concentration and Coal Composition on Aerosol Chemistry in Oxy Firing William J.Morris Dunxi Yu Jost O. L. Wendt Department of Chemical Engineering University of Utah, Salt Lake City, UT 84112 2010 AIChE Annual Meeting Salt Lake City, Utah November 7-12, 2010

  2. Outline • Objectives • Coals examined • Furnace, sampling, and analysis • Results • Conclusions

  3. Objectives • Provide a comparison of three different coal aerosols under two different oxy fired scenarios for predicting effects of coal composition on oxy firing. • Examine aerosol chemistry under two different oxy fired scenarios: 27% O2 (~match heat flux of air) and 32% O2 (~match adiabatic flame temperature of air). • Use aerosol chemistry to provide information for those who wish to make predictions of fouling/slagging within the furnace. • Determine whether there are any significant differences in aerosol chemistry at varying O2 concentrations at conventional temperatures.

  4. Coal Chemistry

  5. Coal Firing Rates and Combustion Conditions

  6. Sampling Systems

  7. Coal feeder Primary Flue gas Secondary 1.2 m 3.8 m Heat exchanger #1 - 8 Laboratory Combustor • Maximum capacity: 100 kW • Representative of full scale units: • Self sustaining combustion • Similar residence times and temperatures • Similar particle and flue gas species concentrations • Allows systematic variation of operational parameters This work: Uses once-through CO2 to simulate cleaned flue gas recycle with all contaminants and water removed. Future work: Will use recycled flue gas. Sampling port

  8. Analysis • Samples were collected with a Berner low pressure impactor. • Size segregated samples were then analyzed using ICP-MS. • Due to the difference in flue gas volume (m3) of OXY27 and OXY32 conditions, results were also normalized to ug per g of coal burned.

  9. Results

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  31. Conclusions • Fine fragmentation mode (~1 um) is not affected by small changes in PO2 at conventional temperatures. • Coal composition still plays the dominant role in aerosol chemistry. • Only differences are noticed in the ultra-fine region <100nm. This is the condensed vapor phase mode and is likely due to a hotter flame temperature yielding increased vaporization.

  32. Acknowledgements • Financial support from the Department of Energy under Awards DE-FC26-06NT42808 and DE-FC08-NT0005015 • David Wagner, Ryan Okerlund, Brian Nelson, Rafael Erickson, and Colby Ashcroft Institute for Clean and Secure Energy, University of Utah • Diego Fernandez and his team of analytical chemists in the Department of Geology and Geophysics, University of Utah

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