Fuel and Combustion

Fuel and Combustion

Experimental and Numerical Study of N2 Dilution on NOx Emission in Methane-Air Premixed Flames

Authors
Mohammad Mahmoodi Arya
Hamid Momahedi Heravi
Faculty of Engineering, Department of Mechanical Engineering, Islamic Azad University, Mashhad, Iran
Abstract
Dilution is one of the ways to reduce maximum temperature in the combustion chamber, which in turn leads to a reduction in the formation of thermal NO. The methods to control NOx formation are all based on temperature control and/or reduction in oxygen concentration. In the present paper, the numerical and experimental studies aim to examine the effect of N2 dilution on the formation of the pollutant NOx in the premixed flame of methane-air in the combustion chamber. The experimental results were obtained by designing a furnace with a cylindrical combustion chamber which was asymmetrical. The experiments were conducted with the equivalence ratios 0.7 to1.3 and various dilution ratios .Combustion simulation was studied using the Premix code of the CHEMKIN II version and various N2 dilution ratios within a range of equivalence ratios. The experimental and simulation results indicated that by increasing the ratio of dilution, maximum temperature of the flame and emission of the pollutant NOx from the combustion chamber decreases. The experimental and simulation results are also in good agreement and the trends of the obtained results conform with the experimental results of Knyazkov et al.
Keywords
NO­
x, Dilution, Simulation, Experimental, Premix
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