Experimental study on non-premixed combustion characteristics of hydrogen-blended natural gas
A non-premixed bluff body coaxial burner and experimental system were developed to investigate the flame structure and pollutant emissions of hydrogen-blended natural gas,which is predominantly composed of CH4,at different fuel flow rates,hydrogen blending ratios and equivalence ratios,against the background of hydrogen-blended natural gas technology.Additionally,the impact of internal components of the burner on combustion performance was examined.The results show that after the injection of hydrogen,the flame height decreases and concentration of CO emission is reduced,while concentration of NOx emission increases.When the hydrogen blending ratio reaches 80％,concentration of CO emission is reduced by 93.5％,and concentration of NOx emission approximately doubles.As the fuel flow rate increases,the flame gradually becomes longer and wider,and the concentrations of both CO and NO x emission have increased.When the equivalence ratio is less than 0.7,as the equivalence ratio increases,the heat loss in combustion chamber decreases,the average temperature rises,the concentration of CO emission decreases,and the concentration of NOx emission increases.The study also reveals that there are significant differences in the combustion performance of hydrogen-blended CH4 among different internal components of the burner.In addition to reducing concentration of NOx emission by 51.9％,the bluff body-swirler internal component also enhances combustion uniformity and stability.The research findings can offer valuable reference for design,optimization and application of coaxial burners,and contribute to the further advancement of hydrogen-blended natural gas technology.
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维普
