复吹转炉底吹不同气体时钢中氮的行为及吸氮动力学模拟研究

SIMULATION TEST FOR N_2 BEHAYIOR IN BATH AND N_2 ABSORPTION DYNAMICS WITH DIFFERENT BOTTOM STIRRING GAS OF COMBINED BLOWING CONVERTER

在感应炉上进行的底吹CO_2、N_2、CO_2+N_2的复吹模拟实验研究表明,熔池中氮的行为受底吹气体性质、脱碳速度和钢液氧化性的影响;钢液吸氮的动力学规律,随底吹气体的性质不同而有差别,底吹单一CO_2或N_2时,分别为二级反应和一级反应,并求得二级反应的速度常数和氮在钢液中的传质系数分别为K_(-1)=0.044(Wt%)^(-1)·cm·s^(-1),K_d=0.0308cm·s^(-1),底吹CO_2+N_2混合气体时,近似表观二级反应,其表观速度常数K_2=0.0406(Wt％)^(-1)cm·s^(-1)。

A simulation test for combined blowung with bottom stirring gases of CO_2、N_2 and CO_2+N_2 in induction furnace shows that N_2 behavior in the bath, will be influenced by kinds of bottom stirring gas、decarburizing rate and oxidizing property of molten steel; N_2 absorption dynamics rule of the molten steel will vary with different kind of bottom stirring gases, when bottom blowing single gas: CO_2 or N_2, they correspond to second class and first class reaction respectively, as for second class reaction, speed constant and mass transfer coefficient of N_2 in the molten steel are K_(-1)=0. 044(wt%)^(-1)·cm·s^(-1), K_d=0.0308cm·s^(-1); when blowing mixed gas of CO_2 +N_2, it approches apparent second class reaction, and its apparent speed constant is K′_2=0.0406(wt%)^(-1)·cm·s^(-1).