Abstract
This study aims to investigate the governing conditions of a laboratory-scale methane-air MILD furnace equipped with a deflector. Implemented a deflector with arms to enhance the recirculation coefficient and analyzed the effect of increasing the arm's length on MILD combustion parameters. The arm's length was varied from zero to 110 mm. The results demonstrated that as the arm's length increased to 60 mm (Geometry No.3), both the region and intensity of the recirculation coefficient exceeded those observed in other geometries. This increase, up to 22.45 % compared to the armless geometry, is attributable to the expanded recirculation region. By examining the standard deviation of heat released, it was determined that Geometry No. 3 exhibited the smallest deviation (0.013 W). Consequently, heat was distributed more uniformly as the recirculation area in this geometry expanded, resulting in a larger reaction zone. This factor contributed to a more even distribution of heat released and, consequently, the temperature in Geometry No. 3. Moreover, there was an increase in NO pollutant emissions from 13.655 to 18.338 ppm with an increased arm's length. Ultimately, simulation results underscored that Geometry No.3 proved suitable for heat treatment applications regarding temperature uniformity, dilution levels, and reduced emissions of environmental pollutants.
Published Version
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