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http://dx.doi.org/10.4491/KSEE.2011.33.5.325

A Numerical Study of the Combustion Characteristics in a MILD Combustor with the Change of the Fuel and Air Nozzle Position and Air Mass Flow Rate  

Kim, Tae-Kwon (Mechanical and Automotive Engineering Department, Keimyung University)
Shim, Sung-Hoon (Korea Institute of Machinery & Materials)
Chang, Huyk-Sang (Environmental Engineering Department, Youngnam University)
Ha, Ji-Soo (Energy.Environmental Science Department, Keimyung University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.33, no.5, 2011 , pp. 325-331 More about this Journal
Abstract
A numerical analysis of reactive flow in a MILD(Moderate and Intense Low oxygen Dilution) combustor is accomplished to elucidate the characteristics of combustion phenomena in the furnace with the change of fuel and air nozzle position and air mass flow rate. For the case with the fuel nozzle located near center position of combustor, the reaction zone started at the fuel nozzle and had inclined shape toward combustor wall when the air mass flow rate was relatively smaller. On the other hand, the end of reaction zone moved toward center of combustor from combustor wall when the air flow rate was relatively larger. For the case with the air nozzle located near center position of combustor, the reaction zone started at the fuel nozzle and had inclined shape toward combustor wall when the air mass flow rate was relatively small, which was similar as the previous case with smaller air mass flow rate. On the other hand, the end of reaction zone moved toward combustor wall when the air flow rate was relatively larger. The maximum temperature increased as the air mass flow rate increasing for both cases, and the concentration of thermal NOx increased also from the previous reason of temperature characteristics. The concentration of NOx for the case with the air nozzle located near center position of combustor was considerably smaller than that for the case with the fuel nozzle located near center position of combustor. From the present study, the case with the air nozzle located near center position of combustor and theoretical air flow rate was the most effective condition for the NOx reduction and perfect combustion.
Keywords
MILD Combustion; Fuel Nozzle Position; Air Nozzle Position; Maximum Temperature; NOx;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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