Design And Optimization Of Atmospheric-Infrared Gas Burner Based On Multi-factor Coupling Effect

The consumption of natural gas has been increasing year by year,because the adjustment of energy consumption structure in China has gradually accelerated.Urban gas consumption is an important source of natural gas consumption,and its consumption has increased rapidly.Domestic gas burners have attracted attention as the main source of consumption of urban gas.At present,the thermal efficiency and CO emissions of gas burners are widely considered and optimized as important performance parameters of gas cookers.However,the heating uniformity of gas burners which directly affects the cooking process is hardly been researched.Therefore,it is urgent to consider the coupling effects of thermal efficiency,CO emissions and heating uniformity in the design and optimization of burners.In addition,gas burners are mainly divided into atmospheric gas burners and infrared gas burners based on the combustion method.Atmospheric gas burners occupy a major market because of their large heat load and wide heat load adjustment,but their thermal efficiency improvement space is limited.Infrared burners with higher thermal efficiency and better heating uniformity are limited their marketing,because their narrow range of heat load adjustment range resulted many problems such as difficult to judge during the operation process,instability of low heat load,and so on.Therefore,it is significant to design a new type of gas burner that combines the advantages of the both two types of burners and suppress theirs disadvantages.Therefore,this paper comprehensively considers multiple performance parameters of thermal efficiency,CO emissions and heating uniformity,and combines atmospheric and infrared combustion methods.Through numerical simulation and experimental research methods,a new type of atmospheric-infrared gas burner is designed and optimized.Firstly,through the combination of experiment and numerical simulation,this paper studies the coupling effects of important burner structure parameters on thermal efficiency,CO emissions,and thermal uniformity of gas stoves.The study shows that the heating height and the inner burner height are significantly affected on the overall effect.Considering the thermal efficiency,CO emissions and thermal uniformity of gas burner,the overall performance of gas burner is best when the heating height is 62 mm and the inner burner height is 42.7 mm.Secondly,different numerical models are established for the atmospheric-infrared gas burner,and the numerical simulation is compared with the experimental results to determine the numerical model suitable for the atmospheric-infrared gas burner.The research shows that the Realizable k-ε turbulence model and DO radiation model can simulate the flow and heat transfer process well for the atmospheric-infrared gas burner.And this model is suitable for numerical simulation of the atmospheric-infrared gas burner.Finally,based on the numerical model,the effects of the heating height and the burner height on the thermal efficiency,CO emission and the thermal uniformity of the gas burner are studied by numerical simulation.This study shows that the inner/outer burner height has a significant influence on the combined burner.When the burner height of is 40-40-35 mm and the heating height is 22 mm,the new type of atmospheric-infrared gas burner has the best comprehensive performance.