Numerical simulation study on bottom powder injection in RH refining process
Powder injection in RH vacuum chamber can complete the task of secondary refining for high-quality steel.In order to promote the industrial application of this technology,the RH bottom powder injection was numerically simulated to investigate the powder behavior and its impact on the steel flow field,and thus to optimize the nozzle layout.The simulation results indicate that the circulation flow rate of molten steel with nozzle at 180°(i.e.powder injection on the descending snorkel side,abbreviated as scheme 2)is increased by 1.8 t/min(with an increase ratio of 1.4％)compared to that with nozzle at 0°(i.e.powder injection on the ascending snorkel side,abbreviated as scheme 1).The powder concentration in the dead zone of the ladle in scheme 2 is 0.2-0.9 kg/m3 higher than that in scheme 1(with an increase ratio of 6.7％-81.8％).Under the condition of scheme 2,the powder concentration in the dead zone of the ladle decreases with the decrease of the nozzle height.Based on the powder yield,the nozzle height of scheme 2 is determined to be 300 mm.The yield of powder in scheme 2 was 2.59％higher than that in scheme 1.
RH refiningbottom powder injectionnumerical simulationpowder behaviorflow field patterns
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