Simulation on flow field and mixing phenomenon in RH degasser with ladle bottom blowing

Abstract

A numerical method has been employed to investigate the flow field and mixing characteristic in the Rheinsahl-Heraeus (RH) degasser with side-bottom blowing. The numerical results showed that stream flows in the up snorkel, the vacuum chamber, the down snorkel and the ladle form a large rectangular circulation zone in the RH degasser with side-bottom blowing, which can enhance the circulation flow rate effectively. For an RH with side-bottom blowing, when the included angle of the line between bottom blowing location and ladle centre and the line between two snorkels is zero, the circulation flow rate increases initially with increasing dimensionless distance between the bottom blowing location and the ladle centre and then decreases, while the mixing time increases with increasing dimensionless distance. On the other hand, when the dimensionless distance is 0?2, both the circulation flow rate and the mixing time decrease with the increasing included angle initially, reach their minimum value and then increase. The optimum values for the dimensionless distance and the included angle to achieve large circulation flow rate and small mixing time are 0?2 and p/4 in the present work.

Investigation of Gas and Liquid Multiphase Flow in the Rheinsahl–Heraeus (RH) Reactor by Using the Euler–Euler Approach

“…The entire flow pattern calculated in the present work agrees well with many water modeling demonstrations 5,33,34,67 and recent simulations. 31,44,66 To validate the present model, the computational results in the present work are compared with the experimental results reported in previous literatures. 15,66,67 In the work of Park, 15,66 125 kg of copper was added into a 330-ton RH reactor as a tracer under three different gas flow rates.…”

“…Both phases are Newtonian and viscous; 33,44 the liquid phase is incompressible. 35,44 b. The effect of slag on fluid flow is neglected; 35,44,45 fluid flow is at steady state.…”

“…35,44 b. The effect of slag on fluid flow is neglected; 35,44,45 fluid flow is at steady state. 35,44,45 c. Bubbles are assumed to be spherical.…”

“…The effect of slag on fluid flow is neglected; 35,44,45 fluid flow is at steady state. 35,44,45 c. Bubbles are assumed to be spherical. 22,25,33 d. Many models for bubble breakup and coalescence are available in chemical engineering literatures.…”

Morphology Evolution and Phase Interactions of Fe-containing Si₃N₄ in Vacuum High-temperature Environment

“…1,2) As the progress of refining technology, RH refining has developed from single vacuum degassing to multifunctional integrated refining including oxygen-blowing, 3) decarbonization, 4,5) powder injection, 6) desulphurization, 7) temperature compensation, 8) and component alloying, 9) which is featured with short processing period, large production capacity, good refining effect, and easy operation. 10) So it has been applied widely in the clean steel production.…”