In this research, the geometric optimization of a tangential swirl burner for the rotary furnace of Luleh Gostar of Esfarayen (LGE) as a steel pipe industry has been studied, experimen- tally and numerically. To improve the combustion process in the burner, three different parameters namely Diffuser Diameter (DD), Clearance Space (CS) and Fuel Inlet Tube Length (L) are consid- ered and optimized by Response Surface Methodology (RSM). ANSYS-Fluent software with SST k- x turbulence model has been used for the simulation where the modeling results confirmed that the applied method had good accuracy with a maximum error of 2.42% for temperature greater than the experimental values. A multi-objective optimization for the temperature, NOx and CO emissions as responses is applied and results show that when the parameters are DD = 13.73 cm, CS = 5 cm and L = 30 cm, the burner will be optimized where the temperature increased 9.15%, NOx and CO emissions were reduced 4.42% and 39.08%, respectively.

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