Physical Simulation For Mixing And Mass Transfer Characteristics During Rh Vacuum Refining Process

In order to have a deep insight into the transfer phenomena in RH, a 1:5.5 scale water modeling of the prototype has been developed to investigate the alloying, decarburization and degassing process. The circulation flow rate is measured by the ultrasonic flow meter. Such a measurement method does not affect the flow field in RH vacuum refining degasser. The NaCl saturated solution is added at the free surface in vacuum chamber as the tracer and the digital conductivity meter has been employed to record the variation of tracer concentration. The mixing time is defined as the maximum time for the tracer concentration to fall continuously within a 5 pct deviation of the homogeneous value. The NaOH-CO2 solution system is used to study the decarburization process. The volumetric mass transfer coefficient is obtained by the change of CO2 concentration calculated by the PH value during experimental process. The results shows that with the increasing gas flow rate, the recirculation flow rate, oxygen absorption rate, decarburization rate and volume mass transfer coefficient increases, but the mixing time decreases.