Experimental Study on Combustion Characteristics of Pure Hydrogen Fuel Micro-Premix Nozzles
In order to investigate the combustion characteristics of hydrogen micro-premix burners,a model burner had been designed and the experimental study on combustion performance of the burner had been conducted under atmosphere pressure.The effects of nozzle spacing,nozzle diameter and inlet air temperature on flame structure and pollutant emission were studied experimentally.The results showed that the flame presented an independent multi-microjet flame pattern in the working condition range,and the flame began to rise and changed into a large flame pattern when approaching the extinction boundary.When the nozzle spacing was reduced to S=1.5D,the flame fronts between the adjacent flames overlapped each other,and the flames coupling effect was enhanced,which resulted in that the flame stability was reduced.on the other hand,the flame width decreased as the nozzle diameter decreased.The micro-premix model burner could achieve stable combustion and excellent low-emission performance for pure hydrogen in a wide range.Under the adiabatic temperature of 2 000 K,the maximum NOx value was lower than 10×10-6 at 15%O2.
pure hydrogen fuelmicro-premix nozzleflame structureNOx emissionexperimental research
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