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TECHNICAL PAPERS

NOx and N2O Formation Mechanisms—A Detailed Chemical Kinetic Modeling Study on a Single Fuel Particle in a Laboratory-Scale Fluidized Bed

[+] Author and Article Information
Gerhard Löffler, Dietmar Andahazy, Christian Wartha, Franz Winter, Hermann Hofbauer

Institute of Chemical Engineering, Fuel Technology, and Environmental Technology, Vienna University of Technology, A-1060 Vienna, Austria

J. Energy Resour. Technol 123(3), 228-235 (May 10, 2001) (8 pages) doi:10.1115/1.1383973 History: Received October 30, 2000; Revised May 10, 2001
Copyright © 2001 by ASME
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References

Figures

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Formation rate unit (FRU) 2: 1,2[[ellipsis]]inlet of fluidizing gas, 3[[ellipsis]]mass-flow controllers, 4[[ellipsis]]display for the mass-flows, 5[[ellipsis]]preheating zone, 6[[ellipsis]]heating shells, 7[[ellipsis]]thermocouple, 8[[ellipsis]]to the chimney, 9[[ellipsis]]heated filter, 10[[ellipsis]]heated sample lines, 11[[ellipsis]]heated pump, 12[[ellipsis]]heated gas cell, 13[[ellipsis]]FTIR spectrometer, 14,15[[ellipsis]]fuel inlet, 16[[ellipsis]]flask for iodine addition in a water-bath, 17,18,19[[ellipsis]]inlet of optional reaction gas (NH3, HCN, NO, N2O).
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Cascade of reactor units for the two-phase model
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Calculated and measured emissions at standard conditions for important C-containing species (bituminous coal, Tbed=800°C,pO2=10 kPa)
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Calculated and measured emissions at standard conditions for important N-containing species (bituminous coal, Tbed=800°C,pO2=10 kPa)
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Calculated concentrations of N-containing species versus height during devolatilization (bituminous coal, Tbed=800°C,pO2=10 kPa,t=40 s; concentrations in the bubble phase and in the freeboard are represented by bold lines, those in the dense phase by thin lines)
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Calculated concentrations of CO, CO2, and CH4 versus height during devolatilization (bituminous coal, Tbed=800°C,pO2=10 kPa,t=40 s; concentrations in the bubble phase and in the freeboard are represented by bold lines, those in the dense phase by thin lines)
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Calculated concentrations of some radicals versus height during devolatilization (bituminous coal, Tbed=800°C,pO2=10 kPa,t=40 s; concentrations in the bubble phase and in the freeboard are represented by bold lines, those in the dense phase by thin lines)
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Net nitrogen flow during devolatilization (Tbed=800°C,pO2=10 kPa)
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Calculated concentrations of N-containing species versus height during char combustion (bituminous coal, Tbed=800°C,pO2=10 kPa,t=200 s; concentrations in the bubble phase and in the freeboard are represented by bold lines, those in the dense phase by thin lines)

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