| Title |
Influence of Coal Types on N20 Formation Characteristics in Low Temperature Pulverized Coal Combustion |
| Creator |
Naruse, Ichiro; Yamamoto, Yasayuki; Itoh, Yoshifumi; Ohtake, Kazutomo |
| Publisher |
Digitized by J. Willard Marriott Library, University of Utah |
| Date |
1994 |
| Spatial Coverage |
presented at Maui, Hawaii |
| Abstract |
N2O formation/destruction characteristics in pulverized coal combustion especially at low temperature are discussed by using an one-dimensional electrically heated laminar drop furnace for various coal types . The behavior of nitrogen compounds along the furnace axis is studied by analyzing both the sampled burning particles and combustion gas and by calculating the mass balance of nitrogen. Additionally the effects of the combustion efficiency and the ratio of fixed carbon to volatile matter content (fuel ratio) are elucidated experimentally. As a result, coals which evolve more HCN than NH3 produce higher N2O concentration. Downstream region beyond the volatile matter combustion being finished, N2O concentration increases but NO concentration decreases gradually. Increase of N2O in this region may be caused by not only the reactions between NO and carbon in char: NO+char-C+NCO and NCO+NO+N2O+CO, but a 1 so the direct heterogeneous reaction between nitrogen in char and NO: char-N+NO+N2O. In case of coals of low fuel ratio, N2O conversion decreases because of high flame temperature surrounding the coal particles due to strong volatile matter combustion. The decomposition reaction of N20 by an H radical produced by the oxidation reaction of CO also contributes near the particle surface. There after the combustion atmosphere and temperature surrounding the coal particles affects the N20 formation. The exit N2O concentration increases with decreasing the combustion efficiency but with decreasing the fuel ratio. By testing nine different types of coal the exit N20 concentration has a good correlation with the combustion efficiency and the fuel ratio. |
| Type |
Text |
| Format |
application/pdf |
| Language |
eng |
| Rights |
This material may be protected by copyright. Permission required for use in any form. For further information please contact the American Flame Research Committee. |
| Conversion Specifications |
Original scanned with Canon EOS-1Ds Mark II, 16.7 megapixel digital camera and saved as 400 ppi uncompressed TIFF, 16 bit depth. |
| Scanning Technician |
Cliodhna Davis |
| ARK |
ark:/87278/s6kd21ht |
| Setname |
uu_afrc |
| ID |
8962 |
| Reference URL |
https://collections.lib.utah.edu/ark:/87278/s6kd21ht |
