高效率RH程序之流力設計及應用於真空氧脫碳反應

Hydrodynamic Design for a High Performance RH-Process and Its Application in Vacuum Oxygen Decarburization

周倉榮(C.L. Chou) ； 石富順(F.S. Shyr) ； 周聖志(S.J. Chou) ； 蔡沛宏(P.H. Tsai) ； 張國基(K.C. Chang)

《鑛冶：中國鑛冶工程學會會刊》 32卷3期 (1988/09) Pp. 129-137

https://doi.org/10.30069/MM.198809_32(3).0015

摘要

為配合電氣鋼片、IF鋼、及超深衝性鋼片等極低碳鋼材漸增的需求，於中鋼結合LBE頂底吹轉爐煉鋼，開發高效率RH真空氧脱碳程序，此項工作正積極在進行。對於高效率RH程序之流力設計，本研究透過一系列的水模實驗，探討氣體各種吹射／攪拌方式，以促進鋼液在真空槽－盛鋼桶間的環流速率，上昇管與真空槽內氣－液雙相質傳係數，及程序鋼浴流攪拌混合的效果。於現場160噸處理容量RH真空脫氣設備的實驗，採用多孔吹嘴氣體引導管（Multiple-Nozzles Snorkel），以利氬氣高吹射流量的建議。實驗證實真空氧脫碳反應動力常數自0.08〜0.10min^(-1)提昇到0.15〜0.20min^(-1)水準。經15〜20分鐘真空氧脫碳的處理，鋼液碳含量可以自150〜200 ppm，脫除到20 ppm以下；及自250〜300ppm脫除到20〜30ppm。

並列摘要

High decarburization efficiency of RH-process has been developed at CSC by combining the LBE converter with steelmaking. Hydrodynamic design for this high performance RH-process was evaluated via a series of water-modelling experiments to maximize the molten-steel circulation between ladle and vacuum vessel, to optimize liquid-gas mass transfer in both up-leg and vacuum vessel, and to improve the bulk-phase mixing. Multiple-nozzles snorkel and higher argon gas flow rate were suggested and adopted to industrial-plant experiments with 160 tons capacity RH degasser. Reaction rate constant for vacuum oxygen decarburization was improved from 0.08-0.10/min to 0.15-0.20/min. The carbon content can be reduced from 150-200 ppm to below 20ppm and from 250-300 ppm to 20-30 ppm in 15-20min treatment, This enables CSC to produce ultra-low carbon steel to supply the increasing demand of electrical steel, interstitial free steel and extra-deep drawing steel, etc.