The Relative Importance of Radicals on the N2O and NO Formation and Destruction Paths in a Quartz CFBC

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

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

J. Energy Resour. Technol 121(2), 131-136 (Jun 01, 1999) (6 pages) doi:10.1115/1.2795068 History: Received June 17, 1998; Revised January 14, 1999; Online November 06, 2007


In a laboratory-scale circulating fluidized bed combustor (CFBC), which mainly consists of quartz-glass, the relative importance of the radicals, generated by the combustion process, on the N2 O and NO formation and destruction paths are studied. The CFBC unit is electrically heated and operating conditions can be nearly independently changed over a wide range; e.g., the bed temperature was varied between 700 and 900°C. The radicals’ importance on the destruction reactions of N2 O has been investigated under CFBC conditions by a recently developed iodine-addition technique to suppress the radical concentrations. Additionally, CO, CH4 and H2 O have been added to study their influence and to change the pool of radicals. Time-resolved concentration changes at the top of the riser have been measured by using a high-performance FT-IR spectrometer in combination with a low-volume, long-path gas cell. The FT-IR analysis is focused on the carbon-containing species, viz., CO2 CO, CH4 NO2 and other hydrocarbons, as well as on the nitrogen-containing species, viz., NO, NO2 , N2 O, and HCN. In the continuous combustion tests, petroleum coke has been burned in the CFBC. Concentration profiles and concentration changes at the top of the riser have been measured. Iodine has been added and the bed temperature and the initial fuel particle size are varied. With the knowledge of the N2 O destruction reactions, the relative importance of the radicals on N2 O and NO formation reactions has been identified and is discussed.

Copyright © 1999 by The American Society of Mechanical Engineers
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