Technological innovations of electric arc furnace bottom-blowing in China
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Nowadays, in China, the bottom-blowing technique plays an important role in accelerating the molten bath stirring and promoting the metallurgical reactions in electric arc furnace (EAF) steelmaking. The innovations of bottom-blowing technologies in EAF steelmaking were reviewed. The optimized bottom-blowing arrangement in EAF based on the furnace structure and the position of electrodes was introduced, and the fluid flow characteristics of EAF molten bath with bottom-blowing were analyzed. Furthermore, bottom-blowing CO2 in EAF can facilitate the carbon–oxygen reaction reaching equilibrium and decrease the content of nitrogen in molten steel due to its special metallurgical properties. Pulsating bottom-blowing in EAF can effectively improve the molten bath stirring through the action of the unsteady bottom-blowing gas streams, which could make the fluid flow field more disorderly than the steady bottom-blowing. And submerged O2 injection with CO2 in EAF can noticeably strengthen the EAF molten bath stirring, increase the production efficiency and improve the molten steel quality.
KeywordsElectric arc furnace Bottom-blowing CO2 Pulsating bottom-blowing EAF combined blowing technology Submerged O2 injection with CO2
The authors would like to express their thanks for the support by the National Natural Science Foundation of China (No. 51734003).
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