عنوان مقاله [English]
In this paper, the effects of heating fuel (natural gas) directly in a gas-fired furnace equipped with a pre-combustor on soot production, luminosity, flame temperature and NOx emissions are investigated numerically and experimentally. Changing F1 and F2 (feeding) fuel rates, in constant total fuel flow rate, investigations were conducted for various F_1/F_total ratios. A probability density function (PDF) being parameterized by the mean and variance of mixture fraction was used to model chemical reactions. To describe the effects of turbulences on soot formation, a Moss–Brooks model and a 𝛽-PDF in terms of normalized temperature is employed. The results reveal that for F_1/F_total <50%, the luminosity of flame increases due to the incomplete combustion of the feeding fuel ensuing soot production. This causes Carbon monoxide (CO) emission to seriously increase. On the other hand, for F_1/F_total =85% the maximum solid carbon mass fraction increased by 9% and flame radiation increased by 15%. Also Nitrogen Oxides (NOx) emission decrease up to 52 ppm.
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