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TECHNICAL PAPERS

The Trade-Off Between N2, NO, and N2O Under Fluidized Bed Combustor Conditions

[+] Author and Article Information
C. Wartha, F. Winter, H. Hofbauer

Institute of Chemical Engineering, Fuel Technology and Environmental Technology, Vienna University of Technology, Getreidemarkt 9/159, A-1060 Vienna, Austria

J. Energy Resour. Technol 122(2), 94-100 (Mar 31, 2000) (7 pages) doi:10.1115/1.483169 History: Received August 16, 1999; Revised March 31, 2000
Copyright © 2000 by ASME
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References

Figures

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Formation rate unit (FRU): 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[[ellipsis]]inlet of reaction gas (NH3,, HCN, NO), 19[[ellipsis]]inlet of combustible gas (CH4)
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Temperature dependence of NH3 oxidation and NO formation from NH3 with and without CH4. The first diagram shows the conversion to CO, CO2 during CH4 injection and the calculated conversion of NH3 to N2 (N2 is the difference between NH3,in and the sum of NOout,NO2,out,N2Oout,HCNout, and NH3,out) with (dashed line) and without CH4. The second diagram shows the conversion of NH3 to NO (NH3,in: 200 ppm, CH4,in: 8000 ppm, pO2: 10 kPa). NO2 has been detected in small amounts between 700 and 800°C, but has been omitted in the figure.
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Temperature dependence of HCN oxidation and NO, N2O formation with and without CH4. The first diagram shows the conversion to CO, CO2 during CH4 injection and the calculated conversion of HCN to N2 (N2 is the difference between HCNin and the sum of NOout,NO2,out,N2Oout,HCNout, and NH3,out) with (dashed line) and without CH4. The second diagram shows the conversion of HCN to NO, NO2, and N2O(HCNin: 180 ppm, CH4,in: 8000 ppm, pO2: 10 kPa).
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Homogeneous gas phase reaction tests. HCN oxidation under fluidized bed combustion conditions (Tb: 850°C, pO2: 10 kPa) without CH4 and with CH4 combustion. Total N is the sum of NO, N2O, HCN, NH3.
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Homogeneous gas phase reaction tests performed in the FRU. NO and N2O formation from HCN and NO under fluidized bed combustion conditions (Tb: 850°C, pO2: 10 kPa). Total-N is the sum of NO, N2O, HCN, NH3.
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NO decomposition without and with CH4. The NO addition was 200 ppm, the CH4 addition 8000 ppm (NOin: 200 ppm, CH4,in: 8000 ppm, pO2: 10 kPa).
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Temperature dependence of the HCN/NO — system with and without CH4. The first diagram shows the conversion of C-species when CH4 is added. (CH4,in: 8000 ppm, pO2: 10 kPa), total-Nin=HCNin+NOin.
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Temperature dependence of the NH3/NO-system with and without CH4. The first diagram shows the conversion of C-species when CH4 (8000 ppm) is added. (pO2: 10 kPa, vL: 0.68 m/s), total-Nin=NH3,in+NOin.
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Test of N2O decomposition without and with CH4(N2Oin: 200 ppm, CH4,in: 8000 ppm, pO2: 10 kPa)
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Fuel-N conversion versus temperature of different fuels (pO2: 10 kPa, vL: 0.68 m/s). Total N is the sum of NO, N2O, HCN, NH3.

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