Structure Optimization of Low NOx Burners for Large Ethylene Cracking Furnaces
With the continuous development of large-capacity and large-sized cracking furnaces,the higher requirements for the burner design of the first 200 kt/a ethylene cracking furnace with single furnace in China was proposed,including meeting specific process requirements and increasingly stringent environ-mental requirements while keeping stable combustion.In which,both CFD technology and hot test method were adopted to develop a new low NOx burner for the ethylene cracking furnace.Numerically analyzing the combustion state(flame shape and length,temperature distribution and NOx emission)within the cracking furnace at different bottom-side heating ratios(bottom-side ratio)shows that,the bottom-side ratio(70:30)is optimal and the temperature distribution there is uniform and it meets the requirements of technology and environmental protection;the final design conditions(72:28)implemented on the hot test furnace shows that,the combustion within the furnace is in good condition together with uniform temperature distribution,ideal heat flux curve and low NOx emission.
cracking furnaceburnerlow NOxnumerical analysishot state testbottom-side ratio
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