Numerical Simulation and Energy-Saving Analysis of Heat Transfer Process in Steel Rolling Heating Furnace
A heat transfer model was established for the heating process of steel billets in a natural gas rolling steel heating furnace.The heating situation of steel billets,consumption of natural gas,and heat dissipation of furnace wall were analyzed.The energy-saving effect of reducing the comprehensive thermal conductivity of the furnace lining and coating with infrared radiation was quantitatively studied.The results show that with the reduction of the comprehensive thermal conductivity of the furnace lining and the increase of the emissivity of the infrared radiation coating,the heating time of billet is shortened and the consumption of natural gas is reduced;while the comprehensive thermal conductivity of the furnace lining is reduced from 0.8 W/(m·K)to 0.4 W/(m·K)and the emissivity of the furnace inner wall is increased from 0.5 to 0.8,the time for heating the steel billet to 1 460 K is shortened by 19.7%,and the consumption of natural gas is reduced by 13.6%.Based on analysis,it is recommended to add high emissivity infrared radiation coatings with near-mid infrared band while selecting a lightweight working layer with low thermal conductivity for energy saving of heating furnaces.
steel rolling heating furnaceenergy savingthermal conductivityinfrared radiation coatingnon steady state numerical simulation
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