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Environmental Engineering Research 2003;8(4): 193-201. DOI: https://doi.org/10.4491/eer.2003.8.4.193
FLAME STABILITY OF CO/H2 SYNGAS IN THE DIFFUSION FLAME BY USING LAB-SCALE BURNER
Byung-Chul Choi, and Hyung-Taek Kim
Dept. of Energy Studies, Ajou University, San 5, Wonchon-dong, Paldal-gu, Suwon, 442-749 Korea
Corresponding Author: Hyung-Taek Kim ,Tel: +82-31-219-2321, Fax: +82-31-219-2969, Email: htkim@ajou.ac.kr
Received: April 15, 2003;  Accepted: September 15, 2003.
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ABSTRACT
The flame stability in lab-scale burner fired with coal-derived syngas has been investigated with the variation of combustion parameters. The tangential type swirl diffusion burner was designed to hold stable flame of coal-derived syngas in the fuel-lean combustion condition. The axial and tangential air flows are properly mixed inside combustor enclosure for the complete oxidization of coal-derived syngas within experimental condition. Parameters such as fuel bulk velocity, CO/H; ratio, excess air percent, swirl number, and nozzle type, are varied for investigating the effect of various experimental conditions on the flame stability. Experimental results represent that different CO/H2 ratio of fuel did not show any effect on the stability limit of the flame. On the other hand, the fuel bulk velocity as well as the calorific value of fuel affected the flame stability limits. For the experiments with nozzle type variation, tangential type nozzles are more stable than the axial type nozzle within experimental conditions. For the experiment of swirl number variation, flame stability limit was increased with swirl number in the range of S<1. Consequently, flame stability of swirl-stabilized burner within same type of nozzle is largely depends on the swirl number comparing to other combustion parameter.
Keywords: flame stability | diffusion flame | coal syngas | swirl
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