In order to further enhance the application of flameless combustion in industrial production,this study uses an industrial-grade burn-er as the research object and carries out a numerical simulation of flameless combustion of methane under air preheating conditions to investi-gate the effects of air preheating temperature and burner structure changes on flameless combustion.The results show that,firstly,high tem-perature preheated air is more advantageous than ambient air for flameless combustion,because on the one hand,the high temperature prehea-ted air saves energy consumption by recycling high temperature flue gas,and on the other hand,the temperature uniformity in the furnace im-proves significantly with the increase of air preheating temperature.The average temperature is around 1 300 K.Secondly,the burner used in this paper needs to meet a certain jet flow(critical jet flow)and thermal power input to achieve flameless combustion.The original burner re-quired a thermal power of 130 kW or more to achieve flameless combustion,but the two optimised burner nozzle structures required significant-ly less thermal power to achieve flameless combustion
关键词
无焰燃烧/数值模拟/炉温分布/空气预热/热功率
Key words
flameless combustion/umerical simulation/furnace temperature distribution/preheated air/thermal power
维普
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