Numerical analysis of combustion characteristics of low NOx burner with fuel classification in metallurgical heating furnace
Drawing on the principle of aero-engine combustion technology,a high-speed and low-NOx burner for metallurgical fuel classification is designed.The effects of the prototype burner and the burners of the single-open A and B two-stage guns on the combustion process were compared.The prototype burner was tested at five loads(100％,80％,60％,40％,20％),and the combustion processes with 5 groups of different air excess coefficients(0.9,1.0,1.1,1.2,1.4)under full load were numerically analyzed.The simulation results show that the hierarchical structure design of the new low-nitrogen burner is reasonable,and the combined design of the two types of fuel secondary guns has a very obvious inhibitory effect on NOx emissions;the burner can ensure good combustion characteristics under different working conditions,and can effectively suppressing NOx emission that the NOx concentration is lower than 65mg/m3(8％O2 concentration conversion);with the decrease of the burner load,the NOx concentration gradually increases;when the air excess coefficient is increased or decreased,the combustion is in rich combustion or lean combustion,and in any case,the generation of NOx will be reduced.For this type of burner,if the burner load is controlled at more than 40％,and the excess air coefficient is controlled at around 1.2,NOx emissions can be effectively reduced.
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