行波磁场对RH精炼过程混合特性的影响

Effects of Traveling Magnetic Field on Mixing Behavior in RH Refining Process

建立了RH精炼装置内混合行为的数学模型,考察了不同励磁电流参数下行波磁场对RH精炼装置内混合特性的影响.计算结果表明:混匀时间随电流强度的增大而减小,并且近似成线性关系;混匀时间随电流频率的增加先减小后增大,并且在30Hz时达到极小值;在励磁电流强度为200A,频率为10Hz的条件下,在上升管或下降管施加行波磁场混匀时间可缩短9%～17%;在相同操作条件下,在上升管处施加行波磁场混匀时间小于在下降管施加行波磁场的混匀时间;同时在上升管和下降管施加行波磁场,混匀时间可缩短18%～26%;混匀时间随吹氩量的增大而减小,在吹氩量为1600NL/min时混匀时间达到极小值,吹氩量继续增大时,混匀时间反而增大.

A mathematical model was developed to investigate the effect of traveling magnetic field with different exciting current parameters on the mixing behavior in RH degasser. The numerical results indicated that the mixing time decreases about linearly with increasing current intensity. The mixing time decreases first then increases with increasing current frequency and comes up to its minimum value at 30Hz. Applying the traveling magnetic field to the uptake or downtake when the exciting current intensity is 200 A at 10 Hz,the mixing time can be shortened by 9%～17%. With the operating conditions kept unchanged,shorter mixing time is available if applying the traveling magnetic field to the uptake instead of downtake,and the time can be shortened by 18%～26% if applying the magnetic field to both the uptake and downtake. Moreover,the mixing time decreases with increasing argon blowing flowrate,and the time comes down to its minimum value if the argon blowing flowrate is 1 600 NL/min. After the moment,the mixing time increases with argon blowing flowrate.