4) Problems on gas stirring (Reference lectures 21,22)

a)  Calculate the recirculation rate of molten steel due to injection of gas in a ladle containing 250 tons of steel  for the following conditions:

Gas flow rate:  and . (Volume is expressed at 1 atmospheric pressure and 273 K).

Bath height: 3 meter and temperature    
 
Discuss the result in terms of effect of gas rate on recirculation and the benefits accrued.

b)  Calculate stirring energy produced in a bath by injection of gas through the bottom of the vessel for the following conditions:

Argon flow rate:  in 100 ton ladle. Bath height is 1.2m. Density of steel is . Temperature of steel bath . Pressure above the surface = 1bar. Temperature of argon .
Stirring power (W)

 

 

 

 

 of steel

 of steel melt.

Repeat the above calculations for gas flow rates  and  in a ladle of 150 ton capacity. Bath height is 1.5m. Discuss the results of calculations.